2.6.14: Oops in iput, from prune_dcache, during umount on system shutdown (bttv?)

[Duncan Sands <duncan.sands@math.u-psud.fr>]

Linux version 2.6.14 (root@baldrick) (gcc version 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu9)) #1 Sun Oct 30 12:30:39 CET 2005
x86

This is the second time I've had this problem; I don't know if it
is significant, but each time I'd been watching tv using the
bttv drivers.

I had to copy this off the screen, and some had scrolled off:

EIP: 0060:[<c0178df9>] Not tainted VLI
EFLAGS: 00010206 (2.6.14)
EIP is at iput+0x19/0x80
eax: 06f5f000	ebx: c717a090	ecx: c717a0a8	edx: c717a0a8
esi: c717a090	edi: 000003e4	ebp: 000027bf	esp: dbe37edc
ds: 007b	es: 007b	ss: 0068

Process umount (pid: 14441, threadinfo=dbe36000, task=dc307540)
Stack: c71776f4   c7176888   c717bb30   ...
Call trace:
c017634e   prune_dcache+0x13e/0x170
c0176638   shrink_dcache_parent+0x18/0x30
c01643a7   generic_shutdown_super+0x27/0x120
00164f5d   kill_block_super+0x2d/0x50
c01642d7   deactivate_super+0x67/0x90
c017b08f   sys_umount+0x36/0xa0
c017b107   sys_oldumount+0x17/0x20
c010304b   sysenter_past_esp+0x54/0x75
Code: ff ff 89 44 24 04 e9 97 fe ff ff 8d ...
/etc/rc0.d/S40umountfs: line 21: 14441 Segmentation fault
umount -tnoproc, noprocfs, nodevfs, nosysfs, nousbfs, nousbdevfs, nodevpts -d -a -r
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