[xenpreview-dev] ocfs2 bug in 9763-0.3 kernel?

[John Byrne]

Perhaps this is a "don't do that" problem, but we have been seeing loop 
mounted files on ocfs2 hang. I found a thread crash in the log. (below) 
fsck didn't resolve the problem. Going back to 
kernel-xen-2.6.16.21-0.15.i586.rpm from the SLES updates *apparently* 
corrected the problem. (I also deleted the disk image file and 
re-created it at the same time, so I am just not sure what has 
apparently fixed the problem.)

I can try to recreate the problem on Monday with the original kernel if 
anyone wants me to.

Thanks,

John Byrne

Sep 22 18:46:15 xen2 kernel: (8336,0):ocfs2_prepare_write:249 ERROR: bug 
expression: OCFS2_I(inode)->ip_data_lockres.l_ex_holders == 0
Sep 22 18:46:15 xen2 kernel: (8336,0):ocfs2_prepare_write:249 ERROR: 
inode 33253 holders 0
Sep 22 18:46:15 xen2 kernel: ------------[ cut here ]------------
Sep 22 18:46:15 xen2 kernel: kernel BUG at fs/ocfs2/aops.c:249!
Sep 22 18:46:15 xen2 kernel: invalid opcode: 0000 [#1]
Sep 22 18:46:15 xen2 kernel: SMP
Sep 22 18:46:15 xen2 kernel: last sysfs file: 
/devices/pci0000:00/0000:00:00.0/irq
Sep 22 18:46:15 xen2 kernel: Modules linked in: ocfs2 jbd mptctl mptbase 
bridge blkbk netbk netloop ocfs2_dlmfs ocfs2_dlm ipv6 ocfs2_nodemanager 
configfs af_packet button battery ac apparmor aamatch_pcre loop dm_mod 
i2c_piix4 i2c_core ohci_hcd usbcore tg3 sworks_agp agpgart reiserfs fan 
thermal processor cciss sg qla2xx firmware_class scsi_transport_fc 
serverworks sd_mod scsi_mod ide_disk ide_core
Sep 22 18:46:15 xen2 kernel: CPU:    0
Sep 22 18:46:15 xen2 kernel: EIP:    0061:[<de5105d3>]    Not tainted VLI
Sep 22 18:46:15 xen2 kernel: EFLAGS: 00010286   (2.6.16.21-0.21_xtp-xen #1)
Sep 22 18:46:15 xen2 kernel: EIP is at ocfs2_prepare_write+0x123/0x260 
[ocfs2]
Sep 22 18:46:15 xen2 kernel: eax: 00000041   ebx: cdbcc480   ecx: 
00000000   edx: 00000000
Sep 22 18:46:15 xen2 kernel: esi: d968d9c0   edi: c11598e0   ebp: 
00000400   esp: cb70ded0
Sep 22 18:46:15 xen2 kernel: ds: 007b   es: 007b   ss: 0069
Sep 22 18:46:15 xen2 kernel: Process loop0 (pid: 8336, 
threadinfo=cb70c000 task=d9e5af70)
Sep 22 18:46:15 xen2 kernel: Stack: <0>de5516fc 00002090 00000000 
de54ef88 000000f9 000081e5 00000000 00000000
Sep 22 18:46:15 xen2 kernel:        c03323a8 cdbcc730 c11598e0 de566a60 
00000400 de2b7b62 00001000 00009ee1
Sep 22 18:46:15 xen2 kernel:        c5508510 c0a2b280 da3eee80 da3eee80 
c0149672 00000c00 cb70c000 ce657600
Sep 22 18:46:15 xen2 kernel: Call Trace:
Sep 22 18:46:15 xen2 kernel:  [<de2b7b62>] do_lo_send_aops+0xf2/0x320 [loop]
Sep 22 18:46:15 xen2 kernel:  [<c0149672>] mempool_free+0x42/0x90
Sep 22 18:46:15 xen2 kernel:  [<c02de303>] 
wait_for_completion_interruptible+0xe3/0x180
Sep 22 18:46:15 xen2 kernel:  [<c0117540>] default_wake_function+0x0/0x10
Sep 22 18:46:15 xen2 kernel:  [<de2b6eae>] loop_thread+0x30e/0x430 [loop]
Sep 22 18:46:15 xen2 kernel:  [<de2b7a70>] do_lo_send_aops+0x0/0x320 [loop]
Sep 22 18:46:15 xen2 kernel:  [<de2b6ba0>] loop_thread+0x0/0x430 [loop]
Sep 22 18:46:15 xen2 kernel:  [<c0102b55>] kernel_thread_helper+0x5/0x10
Sep 22 18:46:15 xen2 kernel: Code: 88 ef 54 de 89 44 24 14 89 54 24 18 
8b 41 10 89 44 24 08 8b 01 8b 80 b0 00 00 00 c7 04 24 fc 16 55 de 89 44 
24 04 e8 4d e6 c0 e1 <0f> 0b f9 00 fe 99 55 de 8b 4c 24 38 8d 83 a4 01 
00 00 89 ea 89