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runtime: fix signal stack bug

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In CL 4188061 I changed malg to allocate the requested
number of bytes n, not n+StackGuard, so that the
allocations would use rounder numbers.

The allocation of the signal stack asks for 32k and
then used g->stackguard as the base, but g->stackguard
is StackGuard bytes above the base.  Previously, asking
for 32k meant getting 32k+StackGuard bytes, so using
g->stackguard as the base was safe.  Now, the actual base
must be computed, so that the signal handler does not
run StackGuard bytes past the top of the stack.

Was causing flakiness mainly in programs that use the
network, because they sometimes write to closed network
connections, causing SIGPIPEs.  Was also causing problems
in the doc/progs test.

Also fix Makefile so that changes to stack.h trigger rebuild.

R=bradfitzgo, r, r2
CC=golang-dev
https://golang.org/cl/4230044
This commit is contained in:
Russ Cox 2011-02-24 13:46:44 -08:00
parent d94bf76239
commit 820dc9ff1a
5 changed files with 11 additions and 9 deletions
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4
src/Make.pkg
View File

@ -176,11 +176,9 @@ _cgo_defun.$O: _cgo_defun.c
# Generic build rules.
# These come last so that the rules above can override them
# for more specific file names.
%.$O: %.c
%.$O: %.c $(HFILES)
$(CC) $(CFLAGS) $*.c
%.$O: %.s
$(AS) $*.s
%.$O: $(HFILES)

7
src/pkg/runtime/Makefile
View File

@ -94,6 +94,7 @@ HFILES=\
runtime.h\
hashmap.h\
malloc.h\
stack.h\
$(GOARCH)/asm.h\
$(GOOS)/os.h\
$(GOOS)/signals.h\
@ -141,13 +142,13 @@ version_$(GOOS).go:
./goc2c "`pwd`/$<" > $@.tmp
mv -f $@.tmp $@
%.$O: $(GOARCH)/%.c
%.$O: $(GOARCH)/%.c $(HFILES)
$(CC) $(CFLAGS) $<
%.$O: $(GOOS)/%.c
%.$O: $(GOOS)/%.c $(HFILES)
$(CC) $(CFLAGS) $<
%.$O: $(GOOS)/$(GOARCH)/%.c
%.$O: $(GOOS)/$(GOARCH)/%.c $(HFILES)
$(CC) $(CFLAGS) $<
%.$O: $(GOARCH)/%.s $(GOARCH)/asm.h

3
src/pkg/runtime/darwin/thread.c
View File

@ -5,6 +5,7 @@
#include "runtime.h"
#include "defs.h"
#include "os.h"
#include "stack.h"
extern SigTab runtime·sigtab[];
@ -176,7 +177,7 @@ runtime·minit(void)
{
// Initialize signal handling.
m->gsignal = runtime·malg(32*1024); // OS X wants >=8K, Linux >=2K
runtime·signalstack(m->gsignal->stackguard, 32*1024);
runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024);
}
// Mach IPC, to get at semaphores

3
src/pkg/runtime/freebsd/thread.c
View File

@ -4,6 +4,7 @@
#include "runtime.h"
#include "defs.h"
#include "os.h"
#include "stack.h"
extern SigTab runtime·sigtab[];
extern int32 runtime·sys_umtx_op(uint32*, int32, uint32, void*, void*);
@ -175,7 +176,7 @@ runtime·minit(void)
{
// Initialize signal handling
m->gsignal = runtime·malg(32*1024);
runtime·signalstack(m->gsignal->stackguard, 32*1024);
runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024);
}
void

3
src/pkg/runtime/linux/thread.c
View File

@ -5,6 +5,7 @@
#include "runtime.h"
#include "defs.h"
#include "os.h"
#include "stack.h"
extern SigTab runtime·sigtab[];
@ -274,7 +275,7 @@ runtime·minit(void)
{
// Initialize signal handling.
m->gsignal = runtime·malg(32*1024); // OS X wants >=8K, Linux >=2K
runtime·signalstack(m->gsignal->stackguard, 32*1024);
runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024);
}
void