Data race condition

The value of the shared data will be determined by the interleaving of thread execution. Thread shared data is accessed without holding an appropriate lock, possibly causing a race condition
/ext/test/fail_fs/fail_fs.c:244: MISSING_LOCK 138871 Accessing "fail_fs->fail_enabled" without holding lock "FAIL_FILE_SYSTEM.lock". Elsewhere, "FAIL_FILE_SYSTEM.fail_enabled" is written to with "FAIL_FILE_SYSTEM.lock" held 4 out of 4 times.