b82404837d
WaitForSigusr1 registers a callback to be called on SIGUSR1 directly from the runtime signal handler. Currently, this callback has a write barrier in it, which can crash with a nil P if the GC is active and the signal arrives on an M that doesn't have a P. Fix this by recording the ID of the M that receives the signal instead of the M itself, since that's all we needed anyway. To make sure there are no other problems, this also lifts the callback into a package function and marks it "go:nowritebarrierrec". Fixes #35248. Updates #35276, since in principle a write barrier at exactly the wrong time while entering the scheduler could cause issues, though I suspect that bug is unrelated. Change-Id: I47b4bc73782efbb613785a93e381d8aaf6850826 Reviewed-on: https://go-review.googlesource.com/c/go/+/204620 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Bryan C. Mills <bcmills@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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