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[GWP-ASan] Add locking around unwinder for atfork protection.

Authored by hctim on Feb 2 2021, 11:48 AM.



Unwinders (like libc's backtrace()) can call their own locks (like the
libdl lock). We need to let the unwinder release the locks before
forking. Wrap a new lock around the unwinder for atfork protection.

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hctim requested review of this revision.Feb 2 2021, 11:48 AM
hctim created this revision.
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eugenis accepted this revision.Feb 2 2021, 2:29 PM


This revision is now accepted and ready to land.Feb 2 2021, 2:29 PM
This revision was landed with ongoing or failed builds.Feb 2 2021, 2:45 PM
This revision was automatically updated to reflect the committed changes.