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Austin Clements authored
Commit bbd1a1c7 prevented SIGPROF from scanning stacks that were being copied, but it didn't prevent a stack copy (specifically a stack shrink) from happening while SIGPROF is scanning the stack. As a result, a stack copy may adjust stack barriers while SIGPROF is in the middle of scanning a stack, causing SIGPROF to panic when it detects an inconsistent stack barrier. Fix this by taking the stack barrier lock while adjusting the stack. In addition to preventing SIGPROF from scanning this stack, this will block until any in-progress SIGPROF is done scanning the stack. For 1.5.2. Fixes #13362. Updates #12932. Change-Id: I422219c363054410dfa56381f7b917e04690e5dd Reviewed-on: https://go-review.googlesource.com/17191 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by:
Russ Cox <rsc@golang.org> Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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