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runtime: don't block preemption signal in new M's or ensureSigM

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No test because we already have a test in the syscall package.
The issue reports 1 failure per 100,000 iterations, which is rare enough
that our builders won't catch the problem.

Fixes #52226

Change-Id: I17633ff6cf676b6d575356186dce42cdacad0746
Reviewed-on: https://go-review.googlesource.com/c/go/+/400315
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2022-04-15 13:46:00 -07:00
parent df08c9a821
commit e3982660a7
1 changed files with 4 additions and 0 deletions
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4
src/runtime/signal_unix.go
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@ -1247,6 +1247,7 @@ func unminitSignals() {
// blockableSig reports whether sig may be blocked by the signal mask.
// We never want to block the signals marked _SigUnblock;
// these are the synchronous signals that turn into a Go panic.
// We never want to block the preemption signal if it is being used.
// In a Go program--not a c-archive/c-shared--we never want to block
// the signals marked _SigKill or _SigThrow, as otherwise it's possible
// for all running threads to block them and delay their delivery until
@ -1257,6 +1258,9 @@ func blockableSig(sig uint32) bool {
if flags&_SigUnblock != 0 {
return false
}
if sig == sigPreempt && preemptMSupported && debug.asyncpreemptoff == 0 {
return false
}
if isarchive || islibrary {
return true
}