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runtime: disable CPU profiling before removing the SIGPROF handler

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Otherwise, in c-archive or c-shared mode, there is the chance of
getting a SIGPROF just after the signal handler is removed but before
profiling is disabled, in which case the program will die.

Fixes #46498

Change-Id: I5492beef45fec9fb9a7f58724356d6aedaf799ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/329290
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Ian Lance Taylor 2021-06-17 17:34:18 -07:00
parent 6f22d2c682
commit 57aaa19aae
1 changed files with 2 additions and 2 deletions
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4
src/runtime/signal_unix.go
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@ -280,6 +280,8 @@ func setProcessCPUProfiler(hz int32) {
it.it_value = it.it_interval
setitimer(_ITIMER_PROF, &it, nil)
} else {
setitimer(_ITIMER_PROF, &itimerval{}, nil)
// If the Go signal handler should be disabled by default,
// switch back to the signal handler that was installed
// when we enabled profiling. We don't try to handle the case
@ -303,8 +305,6 @@ func setProcessCPUProfiler(hz int32) {
setsig(_SIGPROF, h)
}
}
setitimer(_ITIMER_PROF, &itimerval{}, nil)
}
}