mpirun -np 6 n1-4 ./multi_mmap -w regular -r mmap -i 1000 -b 4096 /ocfs2/mmap_test4 ca-test27: rank: 2, procs: 6, filename "/ocfs2/mmap_test4" ca-test26: rank: 1, procs: 6, filename "/ocfs2/mmap_test4" ca-test26: rank: 5, procs: 6, filename "/ocfs2/mmap_test4" ca-test28: rank: 3, procs: 6, filename "/ocfs2/mmap_test4" ca-test25: rank: 0, procs: 6, filename "/ocfs2/mmap_test4" ca-test25: rank: 4, procs: 6, filename "/ocfs2/mmap_test4" ca-test25 (rank 0): Write via write block 0 of 'a'. My pid = 6114 ca-test27 (rank 2): Expect via mmap block 0 of 'a'. My pid = 9995 ca-test25 (rank 4): Expect via mmap block 0 of 'a'. My pid = 6115 ca-test26 (rank 5): Expect via mmap block 0 of 'a'. My pid = 23995 ca-test28 (rank 3): Expect via mmap block 0 of 'a'. My pid = 31806 ca-test26 (rank 1): Expect via mmap block 0 of 'a'. My pid = 23994 kernel BUG in ocfs2_data_convert_worker at fs/ocfs2/dlmglue.c:2695! Oops: Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=64 Modules linked in: ocfs2 qla2xxx ocfs2_dlmfs ocfs2_dlm ocfs2_nodemanager configfs nfs lockd sunrpc NIP: D0000000005AE548 LR: D0000000005AE534 CTR: C00000000003A0A8 REGS: c000000037efb810 TRAP: 0700 Not tainted (2.6.17-ocfs2_mmap-g59690556) MSR: 8000000000029032 CR: 28024022 XER: 20000000 TASK = c000000001f1a040[6086] 'ocfs2vote' THREAD: c000000037ef8000 CPU: 1 GPR00: 0000000000000001 C000000037EFBA90 D0000000006110B0 C000000036089688 GPR04: C000000037EFB880 C000000037EFB888 C000000037EFB9A0 0000000000000000 GPR08: C000000037EFB6C0 3FFFFFFFC87D33F0 C000000037EFB880 C00000003782CC10 GPR12: 0000000028024022 C000000000562600 D000000000175538 C000000037716978 GPR16: 0000000000000000 0000000000000000 0000000000000000 D000000000175540 GPR20: 0000000000000000 0000000001A1FB50 000000000000001C 0000000000000000 GPR24: C0000000377163C8 C000000037EFBCE0 D0000000006082A0 8000000000009032 GPR28: 0000000000000003 C0000000360894A0 D00000000060DD90 C000000036089630 NIP [D0000000005AE548] .ocfs2_data_convert_worker+0xa4/0x1f0 [ocfs2] LR [D0000000005AE534] .ocfs2_data_convert_worker+0x90/0x1f0 [ocfs2] Call Trace: [C000000037EFBA90] [D0000000005AE534] .ocfs2_data_convert_worker+0x90/0x1f0 [ocfs2] (unreliable) [C000000037EFBB20] [D0000000005AE204] .ocfs2_generic_unblock_lock+0xec/0x38c [ocfs2] [C000000037EFBBD0] [D0000000005AE754] .ocfs2_unblock_data+0xc0/0x2bc [ocfs2] [C000000037EFBC70] [D0000000005AF71C] .ocfs2_process_blocked_lock+0x108/0x334 [ocfs2] [C000000037EFBD20] [D0000000005DC558] .ocfs2_vote_thread+0x1bc/0xea8 [ocfs2] [C000000037EFBEE0] [C000000000070630] .kthread+0x154/0x1a4 [C000000037EFBF90] [C000000000026A00] .kernel_thread+0x4c/0x68 Instruction dump: ebbf0000 38800000 38a00000 38c00000 ebfd0188 7fe3fb78 48031e01 e8410028 e81f0038 21200000 7c090114 68000001 <0b000000> 7fe3fb78 48031e11 e8410028