| commit | 9c9d74aba7eb4de2a253b04817ff26b32a6fea40 | [log] [tgz] |
|---|---|---|
| author | Austin Clements <austin@google.com> | Wed Nov 18 14:10:40 2015 -0500 |
| committer | Austin Clements <austin@google.com> | Thu Nov 19 16:35:38 2015 +0000 |
| tree | f67a45f98c691d1a9c67b99a97e44d4a9d5133e2 | |
| parent | 3a2fc06833a346a7c3b071a984b5265b7ea1da57 [diff] |
runtime: prevent sigprof during all stack barrier ops A sigprof during stack barrier insertion or removal can crash if it detects an inconsistency between the stkbar array and the stack itself. Currently we protect against this when scanning another G's stack using stackLock, but we don't protect against it when unwinding stack barriers for a recover or a memmove to the stack. This commit cleans up and improves the stack locking code. It abstracts out the lock and unlock operations. It uses the lock consistently everywhere we perform stack operations, and pushes the lock/unlock down closer to where the stack barrier operations happen to make it more obvious what it's protecting. Finally, it modifies sigprof so that instead of spinning until it acquires the lock, it simply doesn't perform a traceback if it can't acquire it. This is necessary to prevent self-deadlock. Updates #11863, which introduced stackLock to fix some of these issues, but didn't go far enough. Updates #12528. Change-Id: I9d1fa88ae3744d31ba91500c96c6988ce1a3a349 Reviewed-on: https://go-review.googlesource.com/17036 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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