From 7987e545cd82f11719c8642c7d54e7ecdac61524 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Fri, 19 Feb 2016 18:37:51 +0800 Subject: [PATCH] qa/workunits/fs/misc: Add workunit for file lock deadlock detection Signed-off-by: Yan, Zheng --- qa/workunits/fs/misc/filelock_deadlock.py | 68 +++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100755 qa/workunits/fs/misc/filelock_deadlock.py diff --git a/qa/workunits/fs/misc/filelock_deadlock.py b/qa/workunits/fs/misc/filelock_deadlock.py new file mode 100755 index 000000000000..a34476107ab0 --- /dev/null +++ b/qa/workunits/fs/misc/filelock_deadlock.py @@ -0,0 +1,68 @@ +#!/usr/bin/python + +import time +import os +import fcntl +import errno +import signal +import struct + +def handler(signum, frame): + pass + +def lock_two(f1, f2): + lockdata = struct.pack('hhllhh', fcntl.F_WRLCK, 0, 0, 10, 0, 0) + fcntl.fcntl(f1, fcntl.F_SETLKW, lockdata) + time.sleep(10) + + # don't wait forever + signal.signal(signal.SIGALRM, handler); + signal.alarm(10); + exitcode = 0; + try: + fcntl.fcntl(f2, fcntl.F_SETLKW, lockdata) + except IOError, e: + if e.errno == errno.EDEADLK: + exitcode = 1 + elif e.errno == errno.EINTR: + exitcode = 2 + else: + exitcode = 3; + os._exit(exitcode); + +def main(): + pid1 = os.fork() + if pid1 == 0: + f1 = open("testfile1", 'w') + f2 = open("testfile2", 'w') + lock_two(f1, f2) + + pid2 = os.fork() + if pid2 == 0: + f1 = open("testfile2", 'w') + f2 = open("testfile3", 'w') + lock_two(f1, f2) + + pid3 = os.fork() + if pid3 == 0: + f1 = open("testfile3", 'w') + f2 = open("testfile1", 'w') + lock_two(f1, f2) + + deadlk_count = 0 + i = 0 + while i < 3: + pid, status = os.wait(); + exitcode = status >> 8 + if exitcode == 1: + deadlk_count = deadlk_count + 1; + elif exitcode != 0: + raise RuntimeError("unexpect exit code of child") + i = i + 1 + + if deadlk_count != 1: + raise RuntimeError("unexpect count of EDEADLK") + + print 'ok' + +main() -- 2.47.3