https://bugs.llvm.org/show_bug.cgi?id=35171
Bug ID: 35171
Summary: Merge r317115 into the 5.0 branch: Fix race condition
in omp_init_lock
Product: OpenMP
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Runtime Library
Assignee: unassignedb...@nondot.org
Reporter: hah...@hahnjo.de
CC: andrey.churba...@intel.com, jpeyto...@gmail.com,
llvm-bugs@lists.llvm.org, tstel...@redhat.com
Blocks: 34492
This is a partial fix for bug 34050.
This prevents callers of omp_set_lock (which does not hold __kmp_global_lock)
from ever seeing an uninitialized version of __kmp_i_lock_table.table.
It does not solve a use-after-free race condition if omp_set_lock obtains a
pointer to __kmp_i_lock_table.table before it is updated and then attempts to
dereference afterwards. That race is far less likely and can be handled in a
separate patch.
The unit test usually segfaults on the current trunk revision. It passes with
the patch.
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=34492
[Bug 34492] [meta] 5.0.1 Release Blockers
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