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libgo patch committed: Prevent deadlock on SIGPROF during stack scan

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, gofrontend-dev at googlegroups dot com
Date: Fri, 28 Dec 2018 16:07:15 -0800
Subject: libgo patch committed: Prevent deadlock on SIGPROF during stack scan

This libgo patch by Cherry Zhang prevents a deadlock when a profiling
signal arrives during a stack scan.  A precise stack scan needs to
unwind the stack. When it is unwinding the stack, if a profiling
signal arrives, which also does a traceback, it may deadlock in
dl_iterate_phdr.  Prevent this deadlock by setting runtime_in_callers
before traceback.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Attachment: patch.txt
Description: Text document

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