[Gluster-devel] locking race condition

[Emmanuel Dreyfus]

Hi

I hit this bug, on a 2x2 replicated:distributes volume: It does not reproduce
100% off the time, but works (well, breaks) most of the time:

# echo "xxx"|cat -l > test9 
cat: stdout: No such file or directory

FUSE log (2 is ENOENT)
1345425065.650284521 LOOKUP "tmp" path = "test9" error = 2 elapsed = 0.003035340
1345425065.653437220 CREATE "tmp" path = "test9" error = 0 elapsed = 0.006853510
1345425065.663216217 SETLKW "test9"  error = 2 elapsed = 0.449751521 
1345425066.114117361 SETLK "test9"  error = 2 elapsed = 0.002567192 

client log:
[2012-08-20 03:11:06.116305] W [client3_1-fops.c:2186:client3_1_lk_cbk]
  0-gfs33-client-0: remote operation failed: No such file or directory
[2012-08-20 03:11:06.116605] W [fuse-bridge.c:3196:fuse_setlk_cbk]
  0-glusterfs-fuse: 4828311: ERR => -1 (No such file or directory)

client-0 brick log:
[2012-08-20 03:11:06.115077] I [server3_1-fops.c:203:server_lk_cbk]
  0-gfs33-server: 3755325: LK -2 (--) ==> -1 (No such file or directory)
[2012-08-20 03:11:06.119141] I [server3_1-fops.c:203:server_lk_cbk]
  0-gfs33-server: 3755326: LK -2 (--) ==> -1 (No such file or directory)

client0 glusterfsd kernel trace:
 20304     56 glusterfsd CALL  __lstat50(0xb15ff470,0xb15ff8ec)
 20304     56 glusterfsd NAMI
"/export/wd3a/.glusterfs/f9/11/f9111a97-03ed-4409-976b-325d05240edd"
 20304     56 glusterfsd RET   __lstat50 -1 errno 2 No such file or directory
[it retries 5 times, then logs the error]


-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu at netbsd.org