Messages in this thread | | | Subject | Re: 2.5.8-pre3: kernel BUG at usb.c:849! (preempt_count 1) | From | Duncan Sands <> (by way of Duncan Sands <>) | Date | Wed, 10 Apr 2002 18:47:07 +0200 |
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On Wednesday 10 April 2002 5:41 pm, you wrote: > On Wed, Apr 10, 2002, Duncan Sands <duncan.sands@math.u-psud.fr> wrote: > > 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 > > 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.
> > <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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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