kernel BUG at fs/locks.c:1729!

kernel BUG at fs/locks.c:1729!

[Jeff Mahoney]

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Hey all -

Ran across this while rebooting a UML instance under 2.6.5; I took a
quick look but was hoping that someone with more familiarity with the
file locking system would be able to notice something more quickly.

To be clear, the BUG was seen on the host kernel, not in the UML kernel.

This is reproducable for me every time I reboot a UML instance; 'halt'
works fine.

The bug occurs when a file is fput for the last time and all the locks
are cleaned up on it. If posix locks remain, it BUGs.

- -Jeff


kernel BUG at fs/locks.c:1729!
invalid operand: 0000 [#1]
SMP
CPU:    1
EIP:    0060:[<c016db0b>]    Not tainted
EFLAGS: 00010246   (2.6.5)
EIP is at locks_remove_flock+0x6b/0xc0
eax: f7c08ba0   ebx: f69bdc68   ecx: f66f0000   edx: 00000001
esi: f78ae0e0   edi: f69bdbdc   ebp: f66f1e08   esp: f66f1e00
ds: 007b   es: 007b   ss: 0068
Process linux (pid: 3046, threadinfo=f66f0000 task=f68d3390)
Stack: f78ae0e0 f7fdeee0 f66f1e28 c0159871 f78ae0e0 f6c584a0 f6a08280
f78ae0e0
~       00000000 f7936a80 f66f1e44 c0156847 f78ae0e0 f7936a80 000060df
0000002b
~       f7936a80 f66f1e64 c01220b7 f78ae0e0 f7936a80 00000002 f793c060
f793c080
Call Trace:
~ [<c0159871>] __fput+0x31/0x120
~ [<c0156847>] filp_close+0x57/0x90
~ [<c01220b7>] put_files_struct+0x67/0xd0
~ [<c01230a7>] do_exit+0x197/0xb80
~ [<c012ab35>] __dequeue_signal+0x155/0x1d0
~ [<c0123acd>] do_group_exit+0x3d/0xc0
~ [<c012d12f>] get_signal_to_deliver+0x28f/0x388
~ [<c0107527>] do_signal+0x87/0x690
~ [<c012c2fc>] specific_send_sig_info+0xcc/0xd0
~ [<c011cd4c>] schedule+0x1ec/0x6d0
~ [<c016989c>] sys_rmdir+0xbc/0x100
~ [<c0107b6b>] do_notify_resume+0x3b/0x40
~ [<c0108386>] work_notifysig+0x13/0x15

Code: 0f 0b c1 06 38 2b 36 c0 eb db b8 00 e0 ff ff 21 e0 8b 10 8b


- --
Jeff Mahoney
SuSE Labs
jeffm@suse.com
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