UP x86 K6 system running 2.5.8-pre3 with preemption.
Using usb-uhci. I got the following bug when powering off:
usb.c: USB disconnect on device 3
kernel BUG at usb.c:849!
invalid operand: 0000
CPU: 0
EIP: 0010:[<cc8babe2>] Not tainted
EFLAGS: 00010246
eax: 00000000 ebx: cb8e2800 ecx: cb8e2550 edx: 00000002
esi: cbc75d88 edi: cc8c7a20 ebp: ffffffff esp: cab5ff24
ds: 0018 es: 0018 ss: 0018
Process rmmod (pid: 1787, threadinfo=cab5e000 task=c952a6a0)
Stack: cb8e29f8 cc8bbafe cb8e2800 cb8e25bc cb796180 cc8c79a0 0000000e 0000024c
cb8e2800 cc8bbaad cb8e25bc cb796080 cc8ce600 c71a5000 cc8c9000 000000c4
cb8e2400 cc8ccc7a cab5ff74 c12dc800 00000000 c01cf07f c12dc800 cc8c9000
Call Trace: [<cc8bbafe>] [<cc8c79a0>] [<cc8bbaad>] [<cc8ce600>] [<cc8ccc7a>]
[pci_unregister_driver+51/76] [<cc8cd176>] [<cc8ce600>] [free_module+23/192]
[sys_delete_module+292/628] [syscall_call+7/11]
Code: 0f 0b 51 03 94 42 8c cc 8b 83 cc 00 00 00 8b 40 18 53 8b 40
<3>error: rmmod[1787] exited with preempt_count 1
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