https://bugs.llvm.org/show_bug.cgi?id=45673
Bug ID: 45673
Summary: compiler-rt/test/profile/Posix/instrprof-gcov-parallel
.test is flaky
Product: compiler-rt
Version: 10.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: profile
Assignee: unassignedb...@nondot.org
Reporter: sly...@inbox.ru
CC: llvm-bugs@lists.llvm.org, t-kawash...@fujitsu.com
Initially noticed as
http://lab.llvm.org:8011/builders/sanitizer-ppc64be-linux/builds/16358 where
parallel prof tests found only 6 of 7 samples.
Running locally I seem to observe similar effect:
"""
#!/bin/bash
rm -f instrprof-gcov-parallel.target.gcda instrprof-gcov-parallel.target.c.gcov
instrprof-gcov-parallel.target.gcda instrprof-gcov-parallel.target.gcno
/usr/lib/llvm/10/bin/clang -o driver
instrprof-gcov-parallel.driver.c
/usr/lib/llvm/10/bin/clang --coverage -o target
instrprof-gcov-parallel.target.c
./driver ./target
llvm-cov gcov instrprof-gcov-parallel.target.gcda >/dev/null 2>&1
fgrep aaa++ instrprof-gcov-parallel.target.c.gcov
"""
"""
$ while :; do ./instrprof-gcov-parallel.test; done
707: 7: aaa++;
...
101: 7: aaa++;
...
707: 7: aaa++;
707: 7: aaa++;
...
606: 7: aaa++;
707: 7: aaa++;
404: 7: aaa++;
707: 7: aaa++;
"""
"""
$ clang --version
clang version 10.0.0
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm/10/bin
"""
Could be some race in handling SIGCHLD and normal process execution?
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