From 842d37ee5f86f12aa096b750adbd2debd9129fcb Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Fri, 11 Mar 2022 18:29:37 -0800
Subject: [PATCH] syscall: add race annotations to Pread and Pwrite

Fixes #51618

Change-Id: Ife894d8c313dce8c4929f40fa0ac90a069f77a89
Reviewed-on: https://go-review.googlesource.com/c/go/+/391954
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
---
 src/runtime/race/testdata/mop_test.go  | 14 +++++++++-
 src/syscall/syscall_aix.go             |  4 +--
 src/syscall/syscall_darwin.go          |  4 +--
 src/syscall/syscall_dragonfly.go       |  4 +--
 src/syscall/syscall_freebsd.go         |  4 +--
 src/syscall/syscall_linux_386.go       |  4 +--
 src/syscall/syscall_linux_amd64.go     |  4 +--
 src/syscall/syscall_linux_arm.go       |  4 +--
 src/syscall/syscall_linux_arm64.go     |  4 +--
 src/syscall/syscall_linux_mips64x.go   |  4 +--
 src/syscall/syscall_linux_mipsx.go     |  4 +--
 src/syscall/syscall_linux_ppc64x.go    |  4 +--
 src/syscall/syscall_linux_riscv64.go   |  4 +--
 src/syscall/syscall_linux_s390x.go     |  4 +--
 src/syscall/syscall_netbsd.go          |  4 +--
 src/syscall/syscall_openbsd.go         |  4 +--
 src/syscall/syscall_solaris.go         |  4 +--
 src/syscall/syscall_unix.go            | 36 ++++++++++++++++++++++++++
 src/syscall/zsyscall_aix_ppc64.go      | 20 +++++++-------
 src/syscall/zsyscall_darwin_amd64.go   |  4 +--
 src/syscall/zsyscall_darwin_arm64.go   |  4 +--
 src/syscall/zsyscall_freebsd_386.go    |  4 +--
 src/syscall/zsyscall_freebsd_amd64.go  |  4 +--
 src/syscall/zsyscall_freebsd_arm.go    |  4 +--
 src/syscall/zsyscall_freebsd_arm64.go  |  4 +--
 src/syscall/zsyscall_linux_386.go      |  4 +--
 src/syscall/zsyscall_linux_amd64.go    |  4 +--
 src/syscall/zsyscall_linux_arm.go      |  4 +--
 src/syscall/zsyscall_linux_arm64.go    |  4 +--
 src/syscall/zsyscall_linux_mips.go     |  4 +--
 src/syscall/zsyscall_linux_mips64.go   |  4 +--
 src/syscall/zsyscall_linux_mips64le.go |  4 +--
 src/syscall/zsyscall_linux_mipsle.go   |  4 +--
 src/syscall/zsyscall_linux_ppc64.go    |  4 +--
 src/syscall/zsyscall_linux_ppc64le.go  |  4 +--
 src/syscall/zsyscall_linux_riscv64.go  |  4 +--
 src/syscall/zsyscall_linux_s390x.go    |  4 +--
 src/syscall/zsyscall_netbsd_386.go     |  4 +--
 src/syscall/zsyscall_netbsd_amd64.go   |  4 +--
 src/syscall/zsyscall_netbsd_arm.go     |  4 +--
 src/syscall/zsyscall_netbsd_arm64.go   |  4 +--
 src/syscall/zsyscall_openbsd_386.go    |  4 +--
 src/syscall/zsyscall_openbsd_amd64.go  |  4 +--
 src/syscall/zsyscall_openbsd_arm.go    |  4 +--
 src/syscall/zsyscall_openbsd_arm64.go  |  4 +--
 src/syscall/zsyscall_openbsd_mips64.go |  4 +--
 src/syscall/zsyscall_solaris_amd64.go  | 20 +++++++-------
 47 files changed, 155 insertions(+), 107 deletions(-)

diff --git a/src/runtime/race/testdata/mop_test.go b/src/runtime/race/testdata/mop_test.go
index 2d093739dfb..d05a443f62a 100644
--- a/src/runtime/race/testdata/mop_test.go
+++ b/src/runtime/race/testdata/mop_test.go
@@ -1896,6 +1896,14 @@ func TestRaceNestedStruct(t *testing.T) {
 }
 
 func TestRaceIssue5567(t *testing.T) {
+	testRaceRead(t, false)
+}
+
+func TestRaceIssue51618(t *testing.T) {
+	testRaceRead(t, true)
+}
+
+func testRaceRead(t *testing.T, pread bool) {
 	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
 	in := make(chan []byte)
 	res := make(chan error)
@@ -1914,7 +1922,11 @@ func TestRaceIssue5567(t *testing.T) {
 		var n, total int
 		b := make([]byte, 17) // the race is on b buffer
 		for err == nil {
-			n, err = f.Read(b)
+			if pread {
+				n, err = f.ReadAt(b, int64(total))
+			} else {
+				n, err = f.Read(b)
+			}
 			total += n
 			if n > 0 {
 				in <- b[:n]
diff --git a/src/syscall/syscall_aix.go b/src/syscall/syscall_aix.go
index acc19b4db32..a2f8c784389 100644
--- a/src/syscall/syscall_aix.go
+++ b/src/syscall/syscall_aix.go
@@ -604,8 +604,8 @@ func PtraceDetach(pid int) (err error) { return ptrace64(PT_DETACH, int64(pid),
 //sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
 //sys	Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Reboot(how int) (err error)
 //sys	Rename(from string, to string) (err error)
diff --git a/src/syscall/syscall_darwin.go b/src/syscall/syscall_darwin.go
index 87fb5c2f62d..2e5387a6d9b 100644
--- a/src/syscall/syscall_darwin.go
+++ b/src/syscall/syscall_darwin.go
@@ -170,8 +170,8 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Munlockall() (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	readdir_r(dir uintptr, entry *Dirent, result **Dirent) (res Errno)
 //sys	Readlink(path string, buf []byte) (n int, err error)
diff --git a/src/syscall/syscall_dragonfly.go b/src/syscall/syscall_dragonfly.go
index f3c0f545214..d8edca99614 100644
--- a/src/syscall/syscall_dragonfly.go
+++ b/src/syscall/syscall_dragonfly.go
@@ -122,12 +122,12 @@ func Pipe2(p []int, flags int) (err error) {
 }
 
 //sys	extpread(fd int, p []byte, flags int, offset int64) (n int, err error)
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	return extpread(fd, p, 0, offset)
 }
 
 //sys	extpwrite(fd int, p []byte, flags int, offset int64) (n int, err error)
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	return extpwrite(fd, p, 0, offset)
 }
 
diff --git a/src/syscall/syscall_freebsd.go b/src/syscall/syscall_freebsd.go
index ecb9ec825aa..8494b21e5b7 100644
--- a/src/syscall/syscall_freebsd.go
+++ b/src/syscall/syscall_freebsd.go
@@ -469,8 +469,8 @@ func convertFromDirents11(buf []byte, old []byte) int {
 //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Rename(from string, to string) (err error)
diff --git a/src/syscall/syscall_linux_386.go b/src/syscall/syscall_linux_386.go
index ef0f53468a1..fc7df8496eb 100644
--- a/src/syscall/syscall_linux_386.go
+++ b/src/syscall/syscall_linux_386.go
@@ -32,8 +32,8 @@ func setTimeval(sec, usec int64) Timeval {
 //sys	Ioperm(from int, num int, on int) (err error)
 //sys	Iopl(level int) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
 //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
diff --git a/src/syscall/syscall_linux_amd64.go b/src/syscall/syscall_linux_amd64.go
index ea5229e8a0a..0bcc664d32a 100644
--- a/src/syscall/syscall_linux_amd64.go
+++ b/src/syscall/syscall_linux_amd64.go
@@ -22,8 +22,8 @@ const _SYS_setgroups = SYS_SETGROUPS
 //sys	Iopl(level int) (err error)
 //sys	Listen(s int, n int) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
diff --git a/src/syscall/syscall_linux_arm.go b/src/syscall/syscall_linux_arm.go
index f00149a1d4a..9db702729f8 100644
--- a/src/syscall/syscall_linux_arm.go
+++ b/src/syscall/syscall_linux_arm.go
@@ -72,8 +72,8 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
 //sys	Utime(path string, buf *Utimbuf) (err error)
 //sys	utimes(path string, times *[2]Timeval) (err error)
 
-//sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys   pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys   pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
 //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
 
diff --git a/src/syscall/syscall_linux_arm64.go b/src/syscall/syscall_linux_arm64.go
index 9ed20f43ed5..ef935f3a63e 100644
--- a/src/syscall/syscall_linux_arm64.go
+++ b/src/syscall/syscall_linux_arm64.go
@@ -28,8 +28,8 @@ func EpollCreate(size int) (fd int, err error) {
 //sysnb	getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sys	Listen(s int, n int) (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
diff --git a/src/syscall/syscall_linux_mips64x.go b/src/syscall/syscall_linux_mips64x.go
index b56b8f06b68..258eb97b7ed 100644
--- a/src/syscall/syscall_linux_mips64x.go
+++ b/src/syscall/syscall_linux_mips64x.go
@@ -23,8 +23,8 @@ const _SYS_setgroups = SYS_SETGROUPS
 //sys	Lchown(path string, uid int, gid int) (err error)
 //sys	Listen(s int, n int) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
diff --git a/src/syscall/syscall_linux_mipsx.go b/src/syscall/syscall_linux_mipsx.go
index c9c9f94e42f..5390277926f 100644
--- a/src/syscall/syscall_linux_mipsx.go
+++ b/src/syscall/syscall_linux_mipsx.go
@@ -24,8 +24,8 @@ func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sys	Lchown(path string, uid int, gid int) (err error)
 //sys	Listen(s int, n int) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
diff --git a/src/syscall/syscall_linux_ppc64x.go b/src/syscall/syscall_linux_ppc64x.go
index 4180a17f3b4..88ad8e4cd4b 100644
--- a/src/syscall/syscall_linux_ppc64x.go
+++ b/src/syscall/syscall_linux_ppc64x.go
@@ -28,8 +28,8 @@ const _SYS_setgroups = SYS_SETGROUPS
 //sys	Listen(s int, n int) (err error)
 //sys	Lstat(path string, stat *Stat_t) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
diff --git a/src/syscall/syscall_linux_riscv64.go b/src/syscall/syscall_linux_riscv64.go
index a5fb18aa857..0ac4c5496ed 100644
--- a/src/syscall/syscall_linux_riscv64.go
+++ b/src/syscall/syscall_linux_riscv64.go
@@ -28,8 +28,8 @@ func EpollCreate(size int) (fd int, err error) {
 //sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sys	Listen(s int, n int) (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
diff --git a/src/syscall/syscall_linux_s390x.go b/src/syscall/syscall_linux_s390x.go
index 5d6f4d2526f..46b252dc95c 100644
--- a/src/syscall/syscall_linux_s390x.go
+++ b/src/syscall/syscall_linux_s390x.go
@@ -25,8 +25,8 @@ const _SYS_setgroups = SYS_SETGROUPS
 //sys	Lchown(path string, uid int, gid int) (err error)
 //sys	Lstat(path string, stat *Stat_t) (err error)
 //sys	Pause() (err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
+//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
diff --git a/src/syscall/syscall_netbsd.go b/src/syscall/syscall_netbsd.go
index 0d562cc78e4..9ccb66c0838 100644
--- a/src/syscall/syscall_netbsd.go
+++ b/src/syscall/syscall_netbsd.go
@@ -198,8 +198,8 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Rename(from string, to string) (err error)
diff --git a/src/syscall/syscall_openbsd.go b/src/syscall/syscall_openbsd.go
index 30a95316e85..1d823510844 100644
--- a/src/syscall/syscall_openbsd.go
+++ b/src/syscall/syscall_openbsd.go
@@ -173,8 +173,8 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Rename(from string, to string) (err error)
diff --git a/src/syscall/syscall_solaris.go b/src/syscall/syscall_solaris.go
index 38c82a11e85..37ce5c9e3c2 100644
--- a/src/syscall/syscall_solaris.go
+++ b/src/syscall/syscall_solaris.go
@@ -434,8 +434,8 @@ func sendmsgN(fd int, p, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags i
 //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
-//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
-//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Rename(from string, to string) (err error)
diff --git a/src/syscall/syscall_unix.go b/src/syscall/syscall_unix.go
index 5ee938115d4..c35df430aaa 100644
--- a/src/syscall/syscall_unix.go
+++ b/src/syscall/syscall_unix.go
@@ -227,6 +227,42 @@ func Write(fd int, p []byte) (n int, err error) {
 	return
 }
 
+func Pread(fd int, p []byte, offset int64) (n int, err error) {
+	n, err = pread(fd, p, offset)
+	if race.Enabled {
+		if n > 0 {
+			race.WriteRange(unsafe.Pointer(&p[0]), n)
+		}
+		if err == nil {
+			race.Acquire(unsafe.Pointer(&ioSync))
+		}
+	}
+	if msanenabled && n > 0 {
+		msanWrite(unsafe.Pointer(&p[0]), n)
+	}
+	if asanenabled && n > 0 {
+		asanWrite(unsafe.Pointer(&p[0]), n)
+	}
+	return
+}
+
+func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+	if race.Enabled {
+		race.ReleaseMerge(unsafe.Pointer(&ioSync))
+	}
+	n, err = pwrite(fd, p, offset)
+	if race.Enabled && n > 0 {
+		race.ReadRange(unsafe.Pointer(&p[0]), n)
+	}
+	if msanenabled && n > 0 {
+		msanRead(unsafe.Pointer(&p[0]), n)
+	}
+	if asanenabled && n > 0 {
+		asanRead(unsafe.Pointer(&p[0]), n)
+	}
+	return
+}
+
 // For testing: clients can set this flag to force
 // creation of IPv6 sockets to return EAFNOSUPPORT.
 var SocketDisableIPv6 bool
diff --git a/src/syscall/zsyscall_aix_ppc64.go b/src/syscall/zsyscall_aix_ppc64.go
index 2a3411374f5..39838a42e65 100644
--- a/src/syscall/zsyscall_aix_ppc64.go
+++ b/src/syscall/zsyscall_aix_ppc64.go
@@ -72,8 +72,8 @@ import "unsafe"
 //go:cgo_import_dynamic libc_Mkdirat mkdirat "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Mknodat mknodat "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Open open "libc.a/shr_64.o"
-//go:cgo_import_dynamic libc_Pread pread "libc.a/shr_64.o"
-//go:cgo_import_dynamic libc_Pwrite pwrite "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_pread pread "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_pwrite pwrite "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_read read "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Reboot reboot "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Rename rename "libc.a/shr_64.o"
@@ -165,8 +165,8 @@ import "unsafe"
 //go:linkname libc_Mkdirat libc_Mkdirat
 //go:linkname libc_Mknodat libc_Mknodat
 //go:linkname libc_Open libc_Open
-//go:linkname libc_Pread libc_Pread
-//go:linkname libc_Pwrite libc_Pwrite
+//go:linkname libc_pread libc_pread
+//go:linkname libc_pwrite libc_pwrite
 //go:linkname libc_read libc_read
 //go:linkname libc_Reboot libc_Reboot
 //go:linkname libc_Rename libc_Rename
@@ -261,8 +261,8 @@ var (
 	libc_Mkdirat,
 	libc_Mknodat,
 	libc_Open,
-	libc_Pread,
-	libc_Pwrite,
+	libc_pread,
+	libc_pwrite,
 	libc_read,
 	libc_Reboot,
 	libc_Rename,
@@ -1067,12 +1067,12 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 *byte
 	if len(p) > 0 {
 		_p0 = &p[0]
 	}
-	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_Pread)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
+	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_pread)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
@@ -1082,12 +1082,12 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 *byte
 	if len(p) > 0 {
 		_p0 = &p[0]
 	}
-	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_Pwrite)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
+	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_pwrite)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
diff --git a/src/syscall/zsyscall_darwin_amd64.go b/src/syscall/zsyscall_darwin_amd64.go
index 0ccdaf2d0ee..ee78a572fcb 100644
--- a/src/syscall/zsyscall_darwin_amd64.go
+++ b/src/syscall/zsyscall_darwin_amd64.go
@@ -1137,7 +1137,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1158,7 +1158,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_darwin_arm64.go b/src/syscall/zsyscall_darwin_arm64.go
index 09bf34bb3c5..ac1eccf7559 100644
--- a/src/syscall/zsyscall_darwin_arm64.go
+++ b/src/syscall/zsyscall_darwin_arm64.go
@@ -1137,7 +1137,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1158,7 +1158,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_freebsd_386.go b/src/syscall/zsyscall_freebsd_386.go
index ed0eb9fa15e..04bad4acc92 100644
--- a/src/syscall/zsyscall_freebsd_386.go
+++ b/src/syscall/zsyscall_freebsd_386.go
@@ -905,7 +905,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -922,7 +922,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_freebsd_amd64.go b/src/syscall/zsyscall_freebsd_amd64.go
index e291a567568..eeb9c0cb9b5 100644
--- a/src/syscall/zsyscall_freebsd_amd64.go
+++ b/src/syscall/zsyscall_freebsd_amd64.go
@@ -905,7 +905,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -922,7 +922,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_freebsd_arm.go b/src/syscall/zsyscall_freebsd_arm.go
index 7dd856fd970..8ea4282ba45 100644
--- a/src/syscall/zsyscall_freebsd_arm.go
+++ b/src/syscall/zsyscall_freebsd_arm.go
@@ -905,7 +905,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -922,7 +922,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_freebsd_arm64.go b/src/syscall/zsyscall_freebsd_arm64.go
index 229a9a22387..73bf50559d6 100644
--- a/src/syscall/zsyscall_freebsd_arm64.go
+++ b/src/syscall/zsyscall_freebsd_arm64.go
@@ -905,7 +905,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -922,7 +922,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_386.go b/src/syscall/zsyscall_linux_386.go
index c385dd3ca14..36a3d7ed391 100644
--- a/src/syscall/zsyscall_linux_386.go
+++ b/src/syscall/zsyscall_linux_386.go
@@ -1196,7 +1196,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1213,7 +1213,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_amd64.go b/src/syscall/zsyscall_linux_amd64.go
index 3e22e209073..07f328e1e26 100644
--- a/src/syscall/zsyscall_linux_amd64.go
+++ b/src/syscall/zsyscall_linux_amd64.go
@@ -1211,7 +1211,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1228,7 +1228,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_arm.go b/src/syscall/zsyscall_linux_arm.go
index 38907a0b354..df79dbd0e15 100644
--- a/src/syscall/zsyscall_linux_arm.go
+++ b/src/syscall/zsyscall_linux_arm.go
@@ -1493,7 +1493,7 @@ func utimes(path string, times *[2]Timeval) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1510,7 +1510,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_arm64.go b/src/syscall/zsyscall_linux_arm64.go
index f335c062d58..73321bd897c 100644
--- a/src/syscall/zsyscall_linux_arm64.go
+++ b/src/syscall/zsyscall_linux_arm64.go
@@ -1196,7 +1196,7 @@ func Listen(s int, n int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1213,7 +1213,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_mips.go b/src/syscall/zsyscall_linux_mips.go
index f5f73895ccc..1ef8eebe4fd 100644
--- a/src/syscall/zsyscall_linux_mips.go
+++ b/src/syscall/zsyscall_linux_mips.go
@@ -1180,7 +1180,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1197,7 +1197,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_mips64.go b/src/syscall/zsyscall_linux_mips64.go
index 32f3c32b9b3..1ed877ce7ea 100644
--- a/src/syscall/zsyscall_linux_mips64.go
+++ b/src/syscall/zsyscall_linux_mips64.go
@@ -1211,7 +1211,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1228,7 +1228,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_mips64le.go b/src/syscall/zsyscall_linux_mips64le.go
index 62dcff45a1f..3d7cc9e3733 100644
--- a/src/syscall/zsyscall_linux_mips64le.go
+++ b/src/syscall/zsyscall_linux_mips64le.go
@@ -1211,7 +1211,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1228,7 +1228,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_mipsle.go b/src/syscall/zsyscall_linux_mipsle.go
index 4761246536a..59b49ddf747 100644
--- a/src/syscall/zsyscall_linux_mipsle.go
+++ b/src/syscall/zsyscall_linux_mipsle.go
@@ -1180,7 +1180,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1197,7 +1197,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_ppc64.go b/src/syscall/zsyscall_linux_ppc64.go
index c9b1365e74e..93632bd1cb4 100644
--- a/src/syscall/zsyscall_linux_ppc64.go
+++ b/src/syscall/zsyscall_linux_ppc64.go
@@ -1273,7 +1273,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1290,7 +1290,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_ppc64le.go b/src/syscall/zsyscall_linux_ppc64le.go
index 0807390894f..fc8f6b7bcf9 100644
--- a/src/syscall/zsyscall_linux_ppc64le.go
+++ b/src/syscall/zsyscall_linux_ppc64le.go
@@ -1273,7 +1273,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1290,7 +1290,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_riscv64.go b/src/syscall/zsyscall_linux_riscv64.go
index 1661d042214..0efa70715d6 100644
--- a/src/syscall/zsyscall_linux_riscv64.go
+++ b/src/syscall/zsyscall_linux_riscv64.go
@@ -1196,7 +1196,7 @@ func Listen(s int, n int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1213,7 +1213,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_linux_s390x.go b/src/syscall/zsyscall_linux_s390x.go
index 2ab78c71bfe..568bb430a64 100644
--- a/src/syscall/zsyscall_linux_s390x.go
+++ b/src/syscall/zsyscall_linux_s390x.go
@@ -1243,7 +1243,7 @@ func Pause() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1260,7 +1260,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_netbsd_386.go b/src/syscall/zsyscall_netbsd_386.go
index 408318181af..9b928592060 100644
--- a/src/syscall/zsyscall_netbsd_386.go
+++ b/src/syscall/zsyscall_netbsd_386.go
@@ -816,7 +816,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -833,7 +833,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_netbsd_amd64.go b/src/syscall/zsyscall_netbsd_amd64.go
index 2039cf6d0ea..ac34c00b5a2 100644
--- a/src/syscall/zsyscall_netbsd_amd64.go
+++ b/src/syscall/zsyscall_netbsd_amd64.go
@@ -816,7 +816,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -833,7 +833,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_netbsd_arm.go b/src/syscall/zsyscall_netbsd_arm.go
index 3c287ea223d..2be5e7baa4d 100644
--- a/src/syscall/zsyscall_netbsd_arm.go
+++ b/src/syscall/zsyscall_netbsd_arm.go
@@ -816,7 +816,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -833,7 +833,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_netbsd_arm64.go b/src/syscall/zsyscall_netbsd_arm64.go
index 1d40db9e6b6..02a652bbbb2 100644
--- a/src/syscall/zsyscall_netbsd_arm64.go
+++ b/src/syscall/zsyscall_netbsd_arm64.go
@@ -816,7 +816,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -833,7 +833,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_openbsd_386.go b/src/syscall/zsyscall_openbsd_386.go
index 2dcc4b2739d..f7986d5ea5c 100644
--- a/src/syscall/zsyscall_openbsd_386.go
+++ b/src/syscall/zsyscall_openbsd_386.go
@@ -1105,7 +1105,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1126,7 +1126,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_openbsd_amd64.go b/src/syscall/zsyscall_openbsd_amd64.go
index 8d4cb9c1e1c..605443d8904 100644
--- a/src/syscall/zsyscall_openbsd_amd64.go
+++ b/src/syscall/zsyscall_openbsd_amd64.go
@@ -1105,7 +1105,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1126,7 +1126,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_openbsd_arm.go b/src/syscall/zsyscall_openbsd_arm.go
index d45bc02fbd3..0f2312fbc40 100644
--- a/src/syscall/zsyscall_openbsd_arm.go
+++ b/src/syscall/zsyscall_openbsd_arm.go
@@ -1105,7 +1105,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1126,7 +1126,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_openbsd_arm64.go b/src/syscall/zsyscall_openbsd_arm64.go
index e060b092fe3..1367e2aba9e 100644
--- a/src/syscall/zsyscall_openbsd_arm64.go
+++ b/src/syscall/zsyscall_openbsd_arm64.go
@@ -1105,7 +1105,7 @@ func libc_pathconf_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -1126,7 +1126,7 @@ func libc_pread_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_openbsd_mips64.go b/src/syscall/zsyscall_openbsd_mips64.go
index 51904b5e29d..2cf84653191 100644
--- a/src/syscall/zsyscall_openbsd_mips64.go
+++ b/src/syscall/zsyscall_openbsd_mips64.go
@@ -810,7 +810,7 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
@@ -827,7 +827,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(p) > 0 {
 		_p0 = unsafe.Pointer(&p[0])
diff --git a/src/syscall/zsyscall_solaris_amd64.go b/src/syscall/zsyscall_solaris_amd64.go
index 7b012bf9bb8..5bb50caaae8 100644
--- a/src/syscall/zsyscall_solaris_amd64.go
+++ b/src/syscall/zsyscall_solaris_amd64.go
@@ -48,8 +48,8 @@ import "unsafe"
 //go:cgo_import_dynamic libc_Nanosleep nanosleep "libc.so"
 //go:cgo_import_dynamic libc_Open open "libc.so"
 //go:cgo_import_dynamic libc_Pathconf pathconf "libc.so"
-//go:cgo_import_dynamic libc_Pread pread "libc.so"
-//go:cgo_import_dynamic libc_Pwrite pwrite "libc.so"
+//go:cgo_import_dynamic libc_pread pread "libc.so"
+//go:cgo_import_dynamic libc_pwrite pwrite "libc.so"
 //go:cgo_import_dynamic libc_read read "libc.so"
 //go:cgo_import_dynamic libc_Readlink readlink "libc.so"
 //go:cgo_import_dynamic libc_Rename rename "libc.so"
@@ -134,8 +134,8 @@ import "unsafe"
 //go:linkname libc_Nanosleep libc_Nanosleep
 //go:linkname libc_Open libc_Open
 //go:linkname libc_Pathconf libc_Pathconf
-//go:linkname libc_Pread libc_Pread
-//go:linkname libc_Pwrite libc_Pwrite
+//go:linkname libc_pread libc_pread
+//go:linkname libc_pwrite libc_pwrite
 //go:linkname libc_read libc_read
 //go:linkname libc_Readlink libc_Readlink
 //go:linkname libc_Rename libc_Rename
@@ -223,8 +223,8 @@ var (
 	libc_Nanosleep,
 	libc_Open,
 	libc_Pathconf,
-	libc_Pread,
-	libc_Pwrite,
+	libc_pread,
+	libc_pwrite,
 	libc_read,
 	libc_Readlink,
 	libc_Rename,
@@ -753,12 +753,12 @@ func Pathconf(path string, name int) (val int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pread(fd int, p []byte, offset int64) (n int, err error) {
+func pread(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 *byte
 	if len(p) > 0 {
 		_p0 = &p[0]
 	}
-	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_Pread)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
+	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_pread)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
@@ -768,12 +768,12 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
+func pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	var _p0 *byte
 	if len(p) > 0 {
 		_p0 = &p[0]
 	}
-	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_Pwrite)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
+	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_pwrite)), 4, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)