Details
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Bug
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Resolution: Not a Bug
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Major
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None
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None
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None
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3
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12652
Description
It looks like we may have a deadlock in the statahead client code. Running lustre 2.4.0-19chaos (see http://github.com/chaos/lustre) we have some clients hanging on close() like so:
PID: 67983 TASK: ffff8804448d0080 CPU: 10 COMMAND: "java"
#0 [ffff88041b969d08] schedule at ffffffff815109b2
#1 [ffff88041b969dd0] cfs_waitq_wait+0xe at ffffffffa043577e [libcfs]
#2 [ffff88041b969de0] ll_stop_statahead+0x1b8 at ffffffffa0aad1b8 [lustre]
#3 [ffff88041b969e60] ll_file_release+0x2d8 at ffffffffa0a6b698 [lustre]
#4 [ffff88041b969ea0] ll_dir_release+0xdb at ffffffffa0a52d5b [lustre]
#5 [ffff88041b969ec0] __fput+0x108 at ffffffff81183898
#6 [ffff88041b969f10] fput+0x25 at ffffffff811839e5
#7 [ffff88041b969f20] filp_close+0x5d at ffffffff8117eddd
#8 [ffff88041b969f50] sys_close+0xa5 at ffffffff8117eeb5
#9 [ffff88041b969f80] system_call_fastpath+0x16 at ffffffff8100b0b2
RIP: 00002aaaaacdb5ad RSP: 00002aaab505f3f8 RFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffffff8100b0b2 RCX: 000000000000003a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000131
RBP: 0000000000000131 R8: 00002aaaab586580 R9: 00002aaaab33a780
R10: 0000000000000131 R11: 0000000000000293 R12: 0000000000000002
R13: 00002aaabc013df0 R14: 00002aaabc107700 R15: 00002aaabc013df0
ORIG_RAX: 0000000000000003 CS: 0033 SS: 002b
PID: 67984 TASK: ffff880639bcb500 CPU: 10 COMMAND: "ll_sa_66672"
#0 [ffff88065abc9d40] schedule at ffffffff815109b2
#1 [ffff88065abc9e08] cfs_waitq_wait+0xe at ffffffffa043577e [libcfs]
#2 [ffff88065abc9e18] ll_statahead_thread+0x59e at ffffffffa0ab288e [lustre]
#3 [ffff88065abc9f48] child_rip+0xa at ffffffff8100c10a
PID: 67985 TASK: ffff880d2faba080 CPU: 11 COMMAND: "ll_agl_66672"
#0 [ffff8809d06fddc0] schedule at ffffffff815109b2
#1 [ffff8809d06fde88] cfs_waitq_wait+0xe at ffffffffa043577e [libcfs]
#2 [ffff8809d06fde98] ll_agl_thread+0x44a at ffffffffa0aadbba [lustre]
#3 [ffff8809d06fdf48] child_rip+0xa at ffffffff8100c10a