0c942e8f2c
Stop-the-world and freeze-the-world (used for unhandled panics) are currently not safe to do at the same time. While a regular unhandled panic can't happen concurrently with STW (if the P hasn't been stopped, then the panic blocks the STW), a panic from a _SigThrow signal can happen on an already-stopped P, racing with STW. When this happens, freezetheworld sets sched.stopwait to 0x7fffffff and stopTheWorldWithSema panics because sched.stopwait != 0. Fix this by detecting when freeze-the-world happens before stop-the-world has completely stopped the world and freeze the STW operation rather than panicking. Fixes #17442. Change-Id: I646a7341221dd6d33ea21d818c2f7218e2cb7e20 Reviewed-on: https://go-review.googlesource.com/34611 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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