2.5.8-pre3: kernel BUG at usb.c:849! (preempt_count 1)

DISCUSSION Duncan Sands (by way of Duncan Sands <[email protected]>) 1 participant 1 message Apr 10, 2002

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Duncan Sands (by way of Duncan Sands <[email protected]>)

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2002-04-10 16:48 UTC #0 lore raw

Quoted 22 lines · you

Quoted 14 lines · Duncan Sands
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
Quoted 6 lines
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

Quoted 1 line

Could you run this through ksymoops?

I did but it didn't give any more info. The problem is that I had no
/var/log/ksymoops directory (used for automatic dumping of symbol info), so after the reboot I couldn't tell ksymoops where the modules were loaded... I am now trying to reproduce the oops and get more info.

Quoted 5 lines

Quoted 1 line
<3>error: rmmod[1787] exited with preempt_count 1
I don't like the looks of that.
JE

It suggests a locking problem, but it may be misleading: imagine the oops came when a spin lock was held, then couldn't you get this message?

All the best,

Duncan.