2.6.21-git11: BUG in loop.ko

[Jeremy Fitzhardinge]

Seems to be getting a 0 refcount.  I don't see anything in the recent
changes which might cause this, but this is relatively new behaviour. 
It was working for me in the 2.6.21-pre time period, but I haven't tried
this since 2.6.21 was released.

The BUG is actually triggered by the __module_get(THIS_MODULE) in
loop_set_fd.

    J

loop: module loaded
device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel@xxxxxxxxxx
------------[ cut here ]------------
kernel BUG at /home/jeremy/hg/xen/paravirt/linux/include/linux/module.h:396!
invalid opcode: 0000 [#1]
PREEMPT SMP 
Modules linked in: dm_snapshot dm_mod loop
CPU:    1
EIP:    0061:[<d085a911>]    Not tainted VLI
EFLAGS: 00010246   (2.6.21-paravirt #1339)
EIP is at lo_ioctl+0x65/0xa52 [loop]
eax: 00000000   ebx: cfb92c98   ecx: d085e480   edx: 00000200
esi: 00004c00   edi: cf8ad428   ebp: cf37fdc0   esp: cf37fbf8
ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0069
Process losetup (pid: 440, ti=cf37e000 task=cf30b4d0 task.ti=cf37e000)
Stack: c1390080 c1390080 cf37fc10 00000008 cf8ad428 cfbb2258 00000000 cf37fc34 
       c01458c5 cfb92c98 c1392a40 cf30ba70 cf30b4d0 cf30ba54 00000002 cf30ba70 
       cf30b4d0 cf30ba54 00000002 00000003 c134c088 c134c088 cf37fc90 c01215b8 
Call Trace:
 [<c0109173>] show_trace_log_lvl+0x1a/0x30
 [<c0109226>] show_stack_log_lvl+0x9d/0xa5
 [<c0109425>] show_registers+0x1f7/0x336
 [<c010967d>] die+0x119/0x21b
 [<c0382c78>] do_trap+0x8a/0xa4
 [<c0109ad1>] do_invalid_op+0x88/0x92
 [<c0382a42>] error_code+0x72/0x78
 [<c0211c79>] blkdev_driver_ioctl+0x4c/0x5d
 [<c02123de>] blkdev_ioctl+0x754/0x7a2
 [<c0198840>] block_ioctl+0x1b/0x1f
 [<c0182e2e>] do_ioctl+0x22/0x68
 [<c01830a6>] vfs_ioctl+0x232/0x245
 [<c0183102>] sys_ioctl+0x49/0x63
 [<c0108080>] syscall_call+0x7/0xb
 =======================
Code: ff 83 f8 06 0f 87 5a 09 00 00 ff 24 85 5c bc 85 d0 8b 9b cc 01 00 00 b8 80 e4 85 d0 89 9d 5c fe ff ff e8 37 0a 8f ef 85 c0 75 04 <0f> 0b eb fe b8 01 00 00 00 e8 79 9f 8c ef e8 ec 4b 9c ef c1 e0 
EIP: [<d085a911>] lo_ioctl+0x65/0xa52 [loop] SS:ESP 0069:cf37fbf8


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