Currently the GC creates a sweepLocker before restarting the world at
the end of the mark phase, so that it can safely flush mcaches without
the runtime incorrectly concluding that sweeping is done before that
happens.
However, with GODEBUG=gcstoptheworld=2, where sweeping happens during
that STW phase, creating that sweepLocker will fail, since the runtime
will conclude that sweeping is in fact complete (all the queues will be
drained). The problem however is that gcSweep, which does the
non-concurrent sweeping, doesn't actually flush mcaches.
In essence, this failure to create a sweepLocker is indicating a real
issue: sweeping is marked as complete, but we haven't flush the mcaches
yet!
The fix to this is to flush mcaches in gcSweep when in a non-concurrent
sweep. Now that gcSweep actually completes a full sweep, it's safe to
ignore a failure to create a sweepLocker (and in fact, it *must* fail).
While we're here, let's also remove _ConcurrentSweep, the debug flag.
There's already an alias for it called concurrentSweep, and there's only
one use of it in gcSweep.
Lastly, add a dist test for the GODEBUG=gcstoptheworld=2 mode.
Fixes#53885.
Change-Id: I8a1e5b8f362ed8abd03f76e4950d3211f145ab1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/479517
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Fixes#60811
Change-Id: Ica947a4789e71826284f9f6e41c298baa3d033e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/503922
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
The new section describes type inference as the problem
of solving a set of type equations for bound type parameters.
The next CL will update the section on unification to match
the new inference approach.
Change-Id: I2cb49bfb588ccc82d645343034096a82b7d602e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/503920
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
goschedImpl transitions the current goroutine from _Grunning to
_Grunnable and places it on the global run queue before calling into
schedule.
It does _not_ call wakep after adding the global run queue. I believe
the intuition behind skipping wakep is that since we are immediately
calling the scheduler so we don't need to wake anything to run this
work. Unfortunately, this intuition is not correct, as it breaks
coordination with spinning Ms [1].
Consider this example scenario:
Initial conditions:
M0: Running P0, G0
M1: Spinning, holding P1 and looking for work
Timeline:
M1: Fails to find work; drops P
M0: newproc adds G1 to P0 runq
M0: does not wakep because there is a spinning M
M1: clear mp.spinning, decrement sched.nmspinning (now in "delicate dance")
M1: check sched.runqsize -> no global runq work
M0: gosched preempts G0; adds G0 to global runq
M0: does not wakep because gosched doesn't wakep
M0: schedules G1 from P0 runq
M1: check P0 runq -> no work
M1: no work -> park
G0 is stranded on the global runq with no M/P looking to run it. This is
a loss of work conservation.
As a result, G0 will have unbounded* scheduling delay, only getting
scheduled when G1 yields. Even once G1 yields, we still won't start
another P, so both G0 and G1 will switch back and forth sharing one P
when they should start another.
*The caveat to this is that today sysmon will preempt G1 after 10ms,
effectively capping the scheduling delay to 10ms, but not solving the P
underutilization problem. Sysmon's behavior here is theoretically
unnecessary, as our work conservation guarantee should allow sysmon to
avoid preemption if there are any idle Ps. Issue #60693 tracks changing
this behavior and the challenges involved.
[1] It would be OK if we unconditionally entered the scheduler as a
spinning M ourselves, as that would require schedule to call wakep when
it finds work in case there is more work.
Fixes#55160.
Change-Id: I2f44001239564b56ea30212553ab557051d22588
Reviewed-on: https://go-review.googlesource.com/c/go/+/501976
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
When a thread transitions to spinning to non-spinning it must recheck
all sources of work because other threads may submit new work but skip
wakep because they see a spinning thread.
However, since the beginning of time (CL 7314062) we do not check the
global run queue, only the local per-P run queues.
The global run queue is checked just above the spinning checks while
dropping the P. I am unsure what the purpose of this check is. It
appears to simply be opportunistic since sched.lock is already held
there in order to drop the P. It is not sufficient to synchronize with
threads adding work because it occurs before decrementing
sched.nmspinning, which is what threads us to decide to wake a thread.
Resolve this by adding an explicit global run queue check alongside the
local per-P run queue checks.
Almost nothing happens between dropped sched.lock after dropping the P
and relocking sched.lock: just clearing mp.spinning and decrementing
sched.nmspinning. Thus it may be better to just hold sched.lock for this
entire period, but this is a larger change that I would prefer to avoid
in the freeze and backports.
For #55160.
Change-Id: Ifd88b5a4c561c063cedcfcfe1dd8ae04202d9666
Reviewed-on: https://go-review.googlesource.com/c/go/+/501975
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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Previously, FindPkg returned the empty string as a sentinel value,
causing Import to collapse all errors to "can't find import".
(See also https://go.dev/wiki/CodeReviewComments#in-band-errors.)
For #61064.
Change-Id: I21f335d206308b44fe585619e00782abb0b65a94
Reviewed-on: https://go-review.googlesource.com/c/go/+/507360
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Auto-Submit: Bryan Mills <bcmills@google.com>
Issue #61486 causes a compiler crash but is not detected when running
stand-alone type-checker tests because no types are recorded.
Set up Config.Info map with all maps when when running local tests
so that type/object recording code is executed during local tests.
For #61486.
Change-Id: I8eb40c8525dac3da65db0dc7e0e654842713b9a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/511657
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
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Currently we may pass C linker flags in nondeterministic order,
as on ELf systems we pass --export-dynamic-symbol for symbols from
a map. This is usally not a big problem because even if the flags
are passed in nondeterministic order the resulting binary is
probably still deterministic. This CL makes it pass them in a
deterministic order to be extra sure. This also helps build
systems where e.g. there is a build cache for the C linking action.
Change-Id: I930524dd2c3387f49d62be7ad2cef937cb2c2238
Reviewed-on: https://go-review.googlesource.com/c/go/+/509215
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
When running "go test" including a main package which has a PGO
profile, we currently build the package being tested and its
dependencies with PGO, but we failed to attach the profile to
test-only dependencies. If a package is (transitively) imported
by both the package being tested and the test, the PGO version
and the non-PGO version of the package are both linked into the
binary, causing link-time error.
This CL fixes this by attaching the PGO profile to dependencies of
the test.
Fixes#61376.
Change-Id: I2559db9843c4cdab596b31e2025d8475ffbf58ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/510835
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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The compiler/assembler's -S output prints relocation type
numerically, which is hard to understand. Every time I need to
count the relocation type constants to figure out which relocation
it actually is. Print the symbolic name instead.
Change-Id: I4866873bbae8b3dc0ee212609cb00280f9164243
Reviewed-on: https://go-review.googlesource.com/c/go/+/501856
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We don't use R_PCREL for calls to dynamic symbols (we use R_CALL
instead). Don't handle R_PCREL as a call.
We don't use R_CALL on ARM64 (we use R_CALLARM64 instead).
Remove those cases, which we don't expect to see.
Change-Id: Idd99022a8eeb65750ffc2936ffdccf8bb0405e30
Reviewed-on: https://go-review.googlesource.com/c/go/+/501859
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Currently, on darwin, we only support cgo_dynamic_import for
functions, but not variables, as we don't need it before.
mach_task_self_ is a variable defined in the system library, which
can be used to e.g. access the process's memory mappings via the
mach API. The C header defines a macro mach_task_self(), which
refers to the variable. To use mach_task_self_ (in pure-Go
programs) we need to access it in Go.
This CL handles cgo_dynamic_import for variables in the linker,
loading its address via the GOT. (Currently only on Darwin, as
we only need it there.)
For #50891.
Change-Id: Idf64fa88ba2f2381443a1ed0b42b14b581843493
Reviewed-on: https://go-review.googlesource.com/c/go/+/501855
Run-TryBot: Cherry Mui <cherryyz@google.com>
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If the test is about to time out, testenv.Command sends SIGQUIT to the
child process. The runtime's SIGQUIT goroutine dump should help us to
determine whether the hangs observed in TestCPUProfileWithFork are a
symptom of #60108 or a separate bug.
For #59995.
Updates #60108.
Change-Id: I26342ca262b2b0772795c8be142cfcad8d90db30
Reviewed-on: https://go-review.googlesource.com/c/go/+/507356
Run-TryBot: Bryan Mills <bcmills@google.com>
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Auto-Submit: Bryan Mills <bcmills@google.com>
`syscall.ForkLock` is not used in `syscall.StartProcess` since
CL 288297, so using it in `sysSocket` makes no sense. This CL
goes a little bit further and removes the `sysSocket` fallback for
Windows 7, since it is not supported since go 1.21 (#57003).
Updates #60942
Change-Id: If14a0d94742f1b80af994f9f69938701ee41b402
Reviewed-on: https://go-review.googlesource.com/c/go/+/506136
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This CL partially reverts CL 297034. Inheritable handles are not
inherited by all workers thanks to using AdditionalInheritedHandles,
which explicitly specifies which handles to inherit by each worker.
This CL doesn't fix any bug, it's more of a cleanup, but also makes
the code more robust and more similar to its Unix counterpart.
Change-Id: I24c2d7f69dfb839a1aeb5858088d8f38b022f702
Reviewed-on: https://go-review.googlesource.com/c/go/+/506535
Reviewed-by: Heschi Kreinick <heschi@google.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
They are already collected via cmd/cgo.
The gccgo_link_c test is tweaked to do real linking as with this
change the cgo ldflags are not fully reflected in go build -n output,
since they now only come from the built archive.
Fixes#60287
Change-Id: Id433435fe8aeb9571327bf936e52a37f400cef4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/497117
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Andrey Bokhanko <andreybokhanko@gmail.com>
Change-Id: Ia567b163efe7b323694c15abcf0cef0effc6ff6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/501995
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Reuse IndexFunc function to avoid confusing subscript indexing, and to reduce code nesting depth.
Change-Id: I309416ebf928071f71054433e078f0fda802fba8
GitHub-Last-Rev: af54738bda
GitHub-Pull-Request: golang/go#61154
Reviewed-on: https://go-review.googlesource.com/c/go/+/507635
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Since CL 402595, the Go compiler no longer uses any package under
crypto, so there is no need to explicitly exclude boring from the
go bootstrap build.
Change-Id: Ib71349fffaab151c6e1fb42a9684151439b70cc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/508402
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The mode used in the os.OpenFile example (0755) has all executable bits set.
I suspect that this ill-advised usage propagates to other codebases (by means of people carelessly copying the usage example), which is why I suggest modifying the example.
Change-Id: Ic36c8b41974f3fe00471822c2414e36b4e5dc1bc
GitHub-Last-Rev: 638f3beefe
GitHub-Pull-Request: golang/go#61384
Reviewed-on: https://go-review.googlesource.com/c/go/+/510135
Reviewed-by: Rob Pike <r@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Use generic implementation of IndexByte/IndexByteString
on plan9/amd64 since the assembly implementation
uses SSE instructions which are classified as floating
point instructions and cannot be used in a note handler.
A similar issue was fixed in CL 100577.
This fixes runtime.TestBreakpoint.
Fixes#61087.
Change-Id: Id0c085e47da449be405ea04ab9b93518c4e2fde8
Reviewed-on: https://go-review.googlesource.com/c/go/+/508400
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: David du Colombier <0intro@gmail.com>
When the host subcomponent of a URL is an IPv6 address, it must be
surrounded by square brackets to prevent colons in the address
from being interpreted as the port: "[fe80::1]:80".
Document this requirement.
Fixes#61093Fixes#61276
Change-Id: Iaf411b9dc211fd876468d6e2e94ff672ba0d329d
Reviewed-on: https://go-review.googlesource.com/c/go/+/508976
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It's currently always nil, and the code gets generally less verbose.
Change-Id: Id4f5f9ac6eac0218dda34b8bd5ef41c633cfaf2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/508396
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Do the same as the code above: "case err == errTooLarge", declare
publicErr as a constant to avoid runtime calls.
Change-Id: I50a9951232c70eff027b0da86c0bbb8bea51acbe
GitHub-Last-Rev: 71d4458ded
GitHub-Pull-Request: golang/go#60884
Reviewed-on: https://go-review.googlesource.com/c/go/+/504456
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Olif Oftimis <oftimisolif@gmail.com>
The runtime was adjusting netpollWaiters before the waiting
goroutines were marked as ready. This could cause the scheduler
to report a deadlock because there were no goroutines ready to run.
Keeping netpollWaiters non-zero ensures that at least one goroutine
will call netpoll(-1) from findRunnable.
This does mean that if a program has network activity for a while
and then never has it again, and also has no timers, then we can leave
an M stranded in a call to netpoll from which it will never return.
At least this won't be a common case. And it's not new; this has been
a potential problem for some time.
Fixes#61454
Change-Id: I17c7f891c2bb1262fda12c6929664e64686463c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/511455
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Reviewed-by: Heschi Kreinick <heschi@google.com>
The Windows DLL loader may call a DLL entry point, in our case
_rt0_amd64_windows_lib, with a stack that is
not 16-byte aligned. In theory, it shouldn't, but under some
circumstances, it does (see below how to reproduce it).
Having an unaligned stack can, and probably will, cause problems
down the line, for example if a movaps instruction tries to store
a value in an unaligned address it throws an Access Violation exception
(code 0xc0000005).
I managed to consistently reproduce this issue by loading a Go DLL into
a C program that has the Page Heap Verification diagnostic enabled [1].
Updates #54187 (and potentially fixes)
[1] https://learn.microsoft.com/en-us/windows-hardware/drivers/debugger/example-12---using-page-heap-verification-to-find-a-bug
Change-Id: Id0fea7f407e024c9b8cdce10ce4802d7535e7542
Reviewed-on: https://go-review.googlesource.com/c/go/+/510755
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Fixes#53301
Change-Id: Id447d57d43b12c3748267295928d45a089549340
Reviewed-on: https://go-review.googlesource.com/c/go/+/507815
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Meidan Li <limeidan@loongson.cn>
TryBot-Bypass: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Per feedback on #56351.
For #56351.
Change-Id: I63dd1713a1efe4d7180d932dbd8e1510cbb32e90
Reviewed-on: https://go-review.googlesource.com/c/go/+/510935
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Reviewed-by: Robert Griesemer <gri@google.com>
Change-Id: I59c4757df83c12b4c8b85cdd523552c5e5e7bf95
Reviewed-on: https://go-review.googlesource.com/c/go/+/508977
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We used to decrement it in netpollgoready, but that missed
the common case of a descriptor becoming ready due to I/O.
All calls to netpollgoready go through netpollunblock,
so this shouldn't miss any decrements we missed before.
Fixes#60782
Change-Id: Ideefefa1ac96ca38e09fe2dd5d595c5dd7883237
Reviewed-on: https://go-review.googlesource.com/c/go/+/503923
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Relnote (golang.org/x/build/cmd/relnote) was run again. Some of the
simpler entries were resolved. TODO's remain for other entries.
For #58645
Change-Id: I0acb5e87b2e9655ffd472e728259a4aa6c4da50e
Reviewed-on: https://go-review.googlesource.com/c/go/+/510375
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
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It is conventional to use `err` for error variables, so change the example to use `err` instead of `e`.
Change-Id: I53bc3c5384fe608b322a55c564e9aee228b43329
GitHub-Last-Rev: 3e2ed84eef
GitHub-Pull-Request: golang/go#61375
Reviewed-on: https://go-review.googlesource.com/c/go/+/510075
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Rob Pike <r@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
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As described in #61249, uncommon pointer sizes do exist. Remove an
unnecessary assertion.
Fixes#61249
Change-Id: Ib15857bd6bcd42ec530817a132bb8db036236c3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/508821
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Sin/Tan are odd, Cos is even, so it is easy to compute the correct
result from the positive argument case.
Change-Id: If851d00fc7f515ece8199cf56d21186ced51e94f
Reviewed-on: https://go-review.googlesource.com/c/go/+/509815
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Srinivas Pokala <Pokala.Srinivas@ibm.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Keith Randall <khr@google.com>
