On Sat, 2006-12-23 at 15:40 +0000, Alistair John Strachan wrote:
> On Wednesday 20 December 2006 14:21, Alistair John Strachan wrote:
> > Hi,
> >
> > Any ideas?
>
> Pretty much like clockwork, it happened again. I think it's time to take this
> seriously as a software bug, and not some hardware problem. I've ran kernels
> since 2.6.0 on this machine without such crashes, and now two of the same in
> 2.6.19.1? Pretty unlikely!
>
> BUG: unable to handle kernel NULL pointer dereference at virtual address
> 00000009
> printing eip:
> c0156f60
> *pde = 00000000
> Oops: 0002 [#1]
> Modules linked in: ipt_recent ipt_REJECT xt_tcpudp ipt_MASQUERADE iptable_nat
> xt_sta
> te iptable_filter ip_tables x_tables prism54 yenta_socket rsrc_nonstatic
> pcmcia_core snd_via82xx snd_ac97_codec snd_ac97_bus
> snd_pcm snd_timer snd_page_alloc snd_mpu401_uart snd_rawmidi snd soundcore
> usblp ehci_hcd eth1394 uhci_hcd usbcore ohci1394 i
> eee1394 via_agp agpgart vt1211 hwmon_vid hwmon ip_nat_ftp ip_nat
> ip_conntrack_ftp ip_conntrack
> CPU: 0
> EIP: 0060:[<c0156f60>] Not tainted VLI
> EFLAGS: 00010246 (2.6.19.1 #1)
> EIP is at pipe_poll+0xa0/0xb0
> eax: 00000008 ebx: 00000000 ecx: 00000008 edx: 00000000
> esi: ee1b9e9c edi: f4d80a00 ebp: ee1b9c1c esp: ee1b9c0c
> ds: 007b es: 007b ss: 0068
> Process java (pid: 5374, ti=ee1b8000 task=f7117560 task.ti=ee1b8000)
> Stack: 00000000 00000000 ee1b9e9c f6c17160 ee1b9fa4 c015d7f3 ee1b9c54 ee1b9fac
> 082dff90 00000010 082dffa0 00000000 ee1b9e94 ee1b9e94 00000002 ee1b9eac
> 00000000 ee1b9e94 c015e580 00000000 00000000 00000002 f6c17160 00000000
> Call Trace:
> [<c015d7f3>] do_sys_poll+0x253/0x480
> [<c015da53>] sys_poll+0x33/0x50
> [<c0102c97>] syscall_call+0x7/0xb
> [<b7f26402>] 0xb7f26402
> =======================
> Code: 58 01 00 00 0f 4f c2 09 c1 89 c8 83 c8 08 85 db 0f 44 c8 8b 5d f4 89 c8
> 8b 75
> f8 8b 7d fc 89 ec 5d c3 89 ca 8b 46 6c 83 ca 10 3b <87> 68 01 00 00 0f 45 ca
> eb b6 8d b6 00 00 00 00 55 b8 01 00 00
Above codes look weird. Could you disassemble kernel image and post
the part around address 0xc0156f60?
"87 68 01 00 00" is instruction xchg, but if I disassemble from the begining,
I couldn't see instruct xchg.
> EIP: [<c0156f60>] pipe_poll+0xa0/0xb0 SS:ESP 0068:ee1b9c0c
>
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