For #53693.
Change-Id: I360f5cb9caf5fa77267a100eebcc282955677abe
Reviewed-on: https://go-review.googlesource.com/c/go/+/547755
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
TryBot-Bypass: Robert Griesemer <gri@google.com>
For #62039.
Change-Id: Id19a4c06489ad24dc44c7caf2405d155d96c6fcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/547695
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
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Auto-Submit: Robert Griesemer <gri@google.com>
Better order in description of changes to go/types.
Move go/types section up so it's in alphabetical order again.
No changes to actual content.
Change-Id: If2f085b665b412489e5dfdba79b7f93598ff2785
Reviewed-on: https://go-review.googlesource.com/c/go/+/546359
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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Also, add some missing <code></code> tags.
For #63223.
Change-Id: I570b82be830b3c124420c5715ab1165ca53725f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/546358
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
For #62037.
Change-Id: Id1d02f88205e5ea62662e78c8313731ec9e55b1e
Reviewed-on: https://go-review.googlesource.com/c/go/+/546975
Reviewed-by: Alan Donovan <adonovan@google.com>
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For #61035.
Change-Id: I27e2c44f9275b508d9dccc50da80896384a4c8fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/546837
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Auto-Submit: Robert Griesemer <gri@google.com>
For #62605.
Change-Id: I3c06b835c874c1be5aa5293e3906bdd06c021d87
Reviewed-on: https://go-review.googlesource.com/c/go/+/546836
Auto-Submit: Robert Griesemer <gri@google.com>
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When I was plumbing min/max support through the compiler, I was
thinking mostly about numeric argument types. As a result, I forgot
that escape analysis would need to be aware that min/max can operate
on string values, which contain pointers.
Fixes#64565.
Change-Id: I36127ce5a2da942401910fa0f9de922726c9f94d
Reviewed-on: https://go-review.googlesource.com/c/go/+/547715
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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The api.txt changes were originally recorded by mistake (sorry)
into go1.21.txt; see CL 504915, which made the actual change
in August.
Change-Id: If46b48d9714f01605888a6e975c1a03ccfce3b3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/547637
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Commit-Queue: Alan Donovan <adonovan@google.com>
This is a replay of CL 516859, after its rollback in CL 543895,
with big-endian systems fixed and the tests disabled on RISC-V
since the compiler is broken there (#64285).
ChaCha8 provides a cryptographically strong generator
alongside PCG, so that people who want stronger randomness
have access to that. On systems with 128-bit vector math
assembly (amd64 and arm64), ChaCha8 runs at about the same
speed as PCG (25% slower on amd64, 2% faster on arm64).
Fixes#64284.
Change-Id: I6290bb8ace28e1aff9a61f805dbe380ccdf25b94
Reviewed-on: https://go-review.googlesource.com/c/go/+/546020
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
To begin with, CL 545515 made the trace parser tolerant of
GoCreateSyscall having a P, but that was wrong. Because dropm trashes
the M's syscalltick, that case should never be possible. So the first
thing this change does is it rewrites the test that CL introduced to
expect a failure instead of a success.
What I'd misinterpreted as a case that should be allowed was actually
the same as the other issues causing #64060, which is that the parser
doesn't correctly implement what happens to Ps when a thread calls back
into Go on non-pthread platforms, and what happens when a thread dies
on pthread platorms (or more succinctly, what the runtime does when it
calls dropm).
Specifically, the GoDestroySyscall event implies that if any P is still
running on that M when it's called, that the P stops running. This is
what is intended by the runtime trashing the M's syscalltick; when it
calls back into Go, the tracer models that thread as obtaining a new P
from scratch.
Handling this incorrectly manifests in one of two ways.
On pthread platforms, GoDestroySyscall is only emitted when a C thread
that previously called into Go is destroyed. However, that thread ID can
be reused. Because we have no thread events, whether it's the same
thread or not is totally ambiguous to the tracer. Therefore, the tracer
may observe a thread that previously died try to start running with a
new P under the same identity. The association to the old P is still
intact because the ID is the same, and the tracer gets confused -- it
appears as if two Ps are running on the same M!
On non-pthread platforms, GoDestroySyscall is emitted on every return to
C from Go code. In this case, the same thread with the same identity is
naturally going to keep calling back into Go. But again, since the
runtime trashes syscalltick in dropm, it's always going to acquire a P
from the tracer's perspective. But if this is a different P than before,
just like the pthread case, the parser is going to get confused, since
it looks like two Ps are running on the same M!
The case that CL 545515 actually handled was actually the non-pthread
case, specifically where the same P is reacquired by an M calling back
into Go. In this case, if we tolerate having a P, then what we'll
observe is the M stealing its own P from itself, then running with it.
Now that we know what the problem is, how do we fix it? This change
addresses the problem by emitting an extra event when encountering a
GoDestroySyscall with an active P in its context. In this case, it emits
an additional ProcSteal event to steal from itself, indicating that the
P stopped running. This removes any association between that M and that
P, resolving any ambiguity in the tracer.
There's one other minor detail that needs to be worked out, and that's
what happens to any *real* ProcSteal event that stole the P we're now
emitting an extra ProcSteal event for. Since, this event is going to
look for an M that may have moved on already and the P at this point is
already idle. Luckily, we have *exactly* the right fix for this. The
handler for GoDestroySyscall now moves any active P it has to the
ProcSyscallAbandoned state, indicating that we've lost information about
the P and that it should be treated as already idle. Conceptually this
all makes sense: this is a P in _Psyscall that has been abandoned by the
M it was previously bound to.
It's unfortunate how complicated this has all ended up being, but we can
take a closer look at that in the future.
Fixes#64060.
Change-Id: Ie9e6eb9cf738607617446e3487392643656069a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/546096
Reviewed-by: Michael Pratt <mpratt@google.com>
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Go 1.21.1 and Go 1.22 have ceased working around an issue with Linux
kernel defaults for transparent huge pages that can result in excessive
memory overheads. (https://bugzilla.kernel.org/show_bug.cgi?id=93111)
Many Linux distributions disable huge pages altogether these days, so
this problem isn't quite as far-reaching as it used to be. Also, the
problem only affects Go programs with very particular memory usage
patterns.
That being said, because the runtime used to actively deal with this
problem (but with some unpredictable behavior), it's preventing users
that don't have a lot of control over their execution environment from
upgrading to Go beyond Go 1.20.
This change adds a GODEBUG to smooth over the transition. The GODEBUG
setting disables transparent huge pages for all heap memory on Linux,
which is much more predictable than restoring the old behavior.
Fixes#64332.
Change-Id: I73b1894337f0f0b1a5a17b90da1221e118e0b145
Reviewed-on: https://go-review.googlesource.com/c/go/+/547475
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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For #50489.
Change-Id: I4544a24327196eb3ed62af64ae5ddb1f60441d12
Reviewed-on: https://go-review.googlesource.com/c/go/+/546357
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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The chunked transfer encoding adds some overhead to
the content transferred. When writing one byte per
chunk, for example, there are five bytes of overhead
per byte of data transferred: "1\r\nX\r\n" to send "X".
Chunks may include "chunk extensions",
which we skip over and do not use.
For example: "1;chunk extension here\r\nX\r\n".
A malicious sender can use chunk extensions to add
about 4k of overhead per byte of data.
(The maximum chunk header line size we will accept.)
Track the amount of overhead read in chunked data,
and produce an error if it seems excessive.
Fixes#64433
Fixes CVE-2023-39326
Change-Id: I40f8d70eb6f9575fb43f506eb19132ccedafcf39
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2076135
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/547335
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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Make sure to alloc+copy large keys and values instead of aliasing them,
when they might be updated by a future assignment.
Fixes#64474
Change-Id: Ie2226a81cf3897e4e2ee24472f2966d397ace53f
Reviewed-on: https://go-review.googlesource.com/c/go/+/546515
Reviewed-by: Cherry Mui <cherryyz@google.com>
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For #61577.
For #61422.
Change-Id: I575bf657fb36bd7103c73620bb2371d0f490af20
Reviewed-on: https://go-review.googlesource.com/c/go/+/546935
Reviewed-by: Cherry Mui <cherryyz@google.com>
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For #50891.
For #61015.
For #61422.
Change-Id: I30d580814ac02fe9f3fbd1a101b2cc05947a9aaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/546475
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
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For #60773.
For #62627.
For #63960.
For #61422.
Change-Id: I3c933f7522f65cd36d11d38a268556d92c8053f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/546026
Reviewed-by: Michael Pratt <mpratt@google.com>
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Auto-Submit: Michael Knyszek <mknyszek@google.com>
Let the fault thread to crash the program to make sure while gdb coredump file could see the correct backtrace in the number one thread in gdb.
Fixes#63277.
Change-Id: Ie4473f76f0feba596091433918bcd35a4ff7e11b
GitHub-Last-Rev: f4615c23f6
GitHub-Pull-Request: golang/go#63666
Reviewed-on: https://go-review.googlesource.com/c/go/+/536895
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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For #61422.
Change-Id: Ia7cb2721e52d9ccd932a49e0c331868eb7749f94
Reviewed-on: https://go-review.googlesource.com/c/go/+/546027
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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CL 546025 failed to check if mp.curg is nil, causing all sorts of
failures. It can very well be nil in this context.
For #64318.
Fixes#64507.
Change-Id: I4a95c3fa16d5e1dee8041394c4bdb9c6ba04f032
Reviewed-on: https://go-review.googlesource.com/c/go/+/546636
Reviewed-by: Michael Pratt <mpratt@google.com>
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These tests represent two patterns of usage, found in Google-internal
tests, that deadlocked after CL 506755.
TestConcurrentRun is a minor variation on TestParallelSub, with the
additional expectation that the concurrent calls to Run (without
explicit calls to Parallel) proceed without blocking. It replaces
TestParallelSub.
TestParentRun is similar, but instead of calling Run concurrently it
calls Run from within the subtest body. It almost certainly represents
an accidental misuse of T.Run, but since that pattern used to run to
completion we don't want to break it accidentally. (Perhaps it should
be diagnosed with a vet check instead?)
While we are testing concurrency, this also cleans up
TestConcurrentCleanup to use a clearer synchronization pattern.
Fixes#64402.
Change-Id: I14fc7e7085a994c284509eac28190c3a8feb04cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/546019
Auto-Submit: Bryan Mills <bcmills@google.com>
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This was released in 1.21, release noted in CL 524675.
(I think it was missed originally and then and backported,
but then somehow incorrectly made it into the 1.22 dragnet.)
Change-Id: I45f3182f14f77f8b92a3b7d5ef0011b71fd3c176
Reviewed-on: https://go-review.googlesource.com/c/go/+/546675
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Using the new type Alias node, this issue is now fixed.
Add a test case.
Fixes#50729.
Change-Id: I22a4cf31b83de497e052989ca2054227e65e9937
Reviewed-on: https://go-review.googlesource.com/c/go/+/546455
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Update the go doc for linker flags. Remove flags that no longer
exist. Also remove flags that are intended for debugging the
linker from user docs. Add -aslr to the doc.
The -n flag does nothing except print a nearly useless message on
XCOFF linking. Deprecate it.
Fixes#64476.
Change-Id: I518c9c6cc009eae50b7c11308348524ad6a62b69
Reviewed-on: https://go-review.googlesource.com/c/go/+/546615
Reviewed-by: Than McIntosh <thanm@google.com>
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The code generation on riscv64 will currently result in incorrect
assembly when a 32 bit integer is right shifted by an amount that
exceeds the size of the type. In particular, this occurs when an
int32 or uint32 is cast to a 64 bit type and right shifted by a
value larger than 31.
Fix this by moving the SRAW/SRLW conversion into the right shift
rules and removing the SignExt32to64/ZeroExt32to64. Add additional
rules that rewrite to SRAIW/SRLIW when the shift is less than the
size of the type, or replace/eliminate the shift when it exceeds
the size of the type.
Add SSA tests that would have caught this issue. Also add additional
codegen tests to ensure that the resulting assembly is what we
expect in these overflow cases.
Fixes#64285
Change-Id: Ie97b05668597cfcb91413afefaab18ee1aa145ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/545035
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: M Zhuo <mzh@golangcn.org>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
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The GoSyscallBegin event is a signal for both the P and the G to enter a
syscall state for the trace parser. (Ps can't have their own event
because it's too hard to model. As soon as the P enters _Psyscall it can
get stolen out of it.) But there's a window in time between when that
event is emitted and when the P enters _Psyscall where the P's status
can get emitted. In this window the tracer will emit the wrong status:
Running instead of Syscall. Really any call into the tracer could emit a
status event for the P, but in this particular case it's when running a
safepoint function that explicitly emits an event for the P's status.
The fix is straightforward. The source-of-truth on syscall status is the
G's status, so the function that emits the P's status just needs to
check the status of any G attached to it. If it's in _Gsyscall, then the
tracer should emit a Syscall status for the P if it's in _Prunning.
Fixes#64318.
Change-Id: I3b0fb0d41ff578e62810b04fa5a3ef73e2929b0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/546025
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For #61422.
Change-Id: Ie0d3c05752d29aa65983add85935d2505560ec55
Reviewed-on: https://go-review.googlesource.com/c/go/+/546029
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With range over int, the rune literal in range expression will be left
as untyped rune, but idealType is not handling this case, causing ICE.
Fixing this by setting the concrete type for untyped rune expresison.
Fixes#64471
Change-Id: I07a151c54ea1d9e1b92e4d96cdfb6e73dca13862
Reviewed-on: https://go-review.googlesource.com/c/go/+/546296
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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This bottoms out in internal/bytealg.Count, which does a fair amount
of avx shenanigans. Make sure we're not reading out of bounds.
Change-Id: Ied0e461f536f75acc24c6797f7fc74e3f3901c10
Reviewed-on: https://go-review.googlesource.com/c/go/+/533116
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Achille Roussel <achille.roussel@gmail.com>
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The shift amounts were wrong in this case, leading to miscompilation
of load combining.
Also the store combining was not triggering when it should.
Fixes#64468
Change-Id: Iaeb08972c5fc1d6f628800334789c6af7216e87b
Reviewed-on: https://go-review.googlesource.com/c/go/+/546355
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
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The parallel subtests are themselves removed from the running map
while they are blocked on calls to t.Parallel, so it is misleading to
log their parents as if they are running when we know they cannot be
making any kind of meaningful progress.
Fixes#64404.
Change-Id: Iaad11d5d4f4c86d775d36e5285c49629dccddd74
Reviewed-on: https://go-review.googlesource.com/c/go/+/546018
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This is a follow-up to CL 536400.
Fixes#64446
Change-Id: I35646732f62cb1937fd448f94ea518544d4295d4
GitHub-Last-Rev: 55db18a909
GitHub-Pull-Request: golang/go#64448
Reviewed-on: https://go-review.googlesource.com/c/go/+/545835
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Previously, its value was unset (NoPos), but the correct
value is a point after the signature (FuncType.End) and
before the body.
Also, fix a bug in Scope.Innermost whereby it would return
the wrong (outer) scope when the query position was in
the FuncType portion of a Func{Decl,Lit}.
The fix is to set the scope's pos/end to those of the
complete Func{Decl,Lit}. This is now documented at
Info.Scopes, along with other missing information.
Also, fix a bug in the go/types (but not types2) scope
test, in which comments were discarded by the parser,
causing the entire test to be a no-op (!).
Also, make failures of TestScopeLookupParent more
informative.
Also, add a release note about the change in behavior.
Fixes#64292Fixes#64295
Change-Id: Ib681f59d1b0b43de977666db08302d7524d3305f
Reviewed-on: https://go-review.googlesource.com/c/go/+/544035
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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As per #62352 the invocation of vmmap may fail (very rarely) due to
a temporary lack of resources on the test runner machine. This PR
allows for retrying the invocation a fixed number of times before
giving up. This is because we suspect the failure is due to
sensible to retry.
Fixes: #62352
Change-Id: I51aa66b949753d8127cc307181b6ef32e91d5b05
Reviewed-on: https://go-review.googlesource.com/c/go/+/545935
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
The Go 1.22 code freeze has recently started. This is a time to update
all golang.org/x/... module versions that contribute packages to the
std and cmd modules in the standard library to latest master versions.
Generated with:
go install golang.org/x/build/cmd/updatestd@latest
go install golang.org/x/tools/cmd/bundle@latest
updatestd -goroot=$(pwd) -branch=master
For #36905.
Change-Id: I76525261b9a954ed21a3bd3cb6c4a12e6c031d80
Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest,gotip-linux-amd64-longtest,gotip-linux-386-longtest
Reviewed-on: https://go-review.googlesource.com/c/go/+/546055
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
See CL 514907
Change-Id: Ieba2d7737115c66990b0ea7629033e787a99be93
Reviewed-on: https://go-review.googlesource.com/c/go/+/545655
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Ludi Rehak <ludi317@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
testCallbackCallersSEH will break if anything in this call chain is
refactored to have a different number of function calls.
This change makes the test more robust by only testing the frames
that are actually relevant to the test.
Change-Id: Idb51514d7079f55da6e6ddc52ad43b1ffe32c8c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/545755
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
