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SubjectRE: 2.6.8.1: kernel panic rmmod'ing apm
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Hi,
It possibly is a similar problem when we remmod processor module (idle
routine need be synchronized). Does the attached patch help?

Thanks,
Shaohua

>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-
>owner@vger.kernel.org] On Behalf Of Brannon Klopfer
>Sent: Thursday, August 19, 2004 8:52 AM
>To: linux-kernel@vger.kernel.org
>Subject: 2.6.8.1: kernel panic rmmod'ing apm
>
>Linux littleblue 2.6.8.1 #81 Wed Aug 18 17:13:39 PDT 2004 i686 unknown
>unknown GNU/Linux
>
>Gnu C 3.3.4
>Gnu make 3.80
>binutils 2.15.90.0.3
>util-linux 2.12a
>mount 2.12a
>module-init-tools 3.0
>e2fsprogs 1.35
>jfsutils 1.1.6
>xfsprogs 2.6.13
>pcmcia-cs 3.2.7
>quota-tools 3.12.
>PPP 2.4.2
>nfs-utils 1.0.6
>Linux C Library 2.3.2
>Dynamic linker (ldd) 2.3.2
>Linux C++ Library 5.0.6
>Procps 3.2.1
>Net-tools 1.60
>Kbd 1.12
>Sh-utils 5.2.1
>Modules Loaded snd_cs4236 snd_opl3_lib snd_hwdep snd_cs4236_lib
>snd_mpu401_uart snd_rawmidi snd_cs4231_lib nfsd exportfs intel_agp
>uhci_hcd serial_cs 3c574_cs ds yenta_socket pcmcia_core agpgart
>
>-----------------------------
>
>Hello,
> When rmmod'ing apm, I get a kernel panic. However, the machine
>continues to function properly, AFAIK. Here's the dmesg:
>
>[snip]
>Unable to handle kernel paging request at virtual address d2d9f211
> printing eip:
>d2d9f211
>*pde = 01357067
>*pte = 00000000
>Oops: 0000 [#1]
>PREEMPT
>Modules linked in: snd_cs4236 snd_opl3_lib snd_hwdep snd_cs4236_lib
>snd_mpu401_uart snd_rawmidi snd_cs4231_lib nfsd exportfs intel_agp
>uhci_hcd serial_cs 3c574_cs ds yenta_socket pcmcia_core agpgart
>CPU: 0
>EIP: 0060:[<d2d9f211>] Not tainted
>EFLAGS: 00010246 (2.6.8.1)
>EIP is at 0xd2d9f211
>eax: 00000000 ebx: 00000000 ecx: ffffffff edx: c03c0000
>esi: 00011ff9 edi: 00000202 ebp: 00000001 esp: c03c0f84
>ds: 007b es: 007b ss: 0068
>Process swapper (pid: 0, threadinfo=c03c0000 task=c033fa40)
>Stack: 00005305 00000000 00000000 00090000 c03e0000 c03c0000 00011ff9
>0000000a
> 00000001 d2d9f373 00005305 00000000 00000000 c03c0fbc 00005305
>d2d9f4ab
> c03c0000 00099100 c03e0120 00423007 c0102164 c03c0000 c03c1723
>c033fa40
>Call Trace:
> [<c0102164>] cpu_idle+0x34/0x40
> [<c03c1723>] start_kernel+0x163/0x180
> [<c03c1340>] unknown_bootoption+0x0/0x160
>Code: Bad EIP value.
> <0>Kernel panic: Attempted to kill the idle task!
>In idle task - not syncing
>
>[END]
>
>After that, the module is gone, and everything works fine. I just tried
>inserting and removeing it subsequent times, and it works with no
errors
>(so far). I only rmmod when apm is used by nothing.
>
>The only reason I'm messing around with the apm module is that Loki's
UT
>seems to (sometimes) run much too fast with APM support in kernel, and
>rmmod'ing it out seems to do the trick. This is probably indicitive of
>another problem, though my system seems pretty stable (other than that
>kernel panic...).
>
>All said, this doesn't bother me, as my system stays up.
>
>-Brannon Klopfer
>-
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