5b6e6d2b3d
GODEBUG=dontfreezetheworld=1 allows goroutines to continue execution during fatal panic. This increases the chance that tracebackothers will encounter running goroutines that it must skip, which is expected and fine. However, it also introduces the risk that a goroutine transitions from stopped to running in the middle of traceback, which is unsafe and may cause traceback crashes. Mitigate this by halting M execution if it naturally enters the scheduler. This ensures that goroutines cannot transition from stopped to running after freezetheworld. We simply deadlock rather than using gcstopm to continue keeping disturbance to scheduler state to a minimum. Change-Id: I9aa8d84abf038ae17142f34f4384e920b1490e81 Reviewed-on: https://go-review.googlesource.com/c/go/+/501255 Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Austin Clements <austin@google.com> Run-TryBot: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> |
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