netdev - Re: BUG: unable to handle kernel NULL pointer dereference at virtual address 000000b0

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Date:	Wed, 17 Oct 2007 10:21:00 +0200 (CEST)
From:	Krzysztof Oledzki <olel@....pl>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	netdev@...r.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at virtual
 address 000000b0



On Wed, 17 Oct 2007, Eric Dumazet wrote:

> Krzysztof Oledzki a écrit :
>> Hello,
>> 
>> Today I found in my logs:
>> 
>> BUG: unable to handle kernel NULL pointer dereference at virtual address 
>> 000000b0
>>  printing eip:
>> 78395f65
>> *pde = 00000000
>> Oops: 0000 [#1]
>> PREEMPT SMP
>> CPU:    0
>> EIP:    0060:[<78395f65>]    Not tainted VLI
>> EFLAGS: 00210286   (2.6.22.9 #1)
>> EIP is at __ip_route_output_key+0x412/0x722
>> eax: 80000000   ebx: 00000000   ecx: 5dd2b1c3   edx: 00000000
>> esi: 00000000   edi: d44c7e30   ebp: ec8c4980   esp: d44c7ddc
>> ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
>> Process smtpd (pid: 12479, ti=d44c6000 task=9e759510 task.ti=d44c6000)
>> Stack: d44c7e7c d44c7e7c d44c7eb8 00000000 d44c7e7c 00000000 00000000 
>> 00000005
>>        00000000 ffffffff 5dd2b1c3 00000000 00000000 00000000 00000000 
>> 00000000
>>        00000000 00000000 00000000 00000000 00000000 00030000 00000000 
>> d44c7e7c
>> Call Trace:
>>  [<78396280>] ip_route_output_flow+0xb/0x3e
>>  [<783b2b29>] ip4_datagram_connect+0x1c9/0x308
>>  [<783ba70a>] inet_dgram_connect+0x45/0x4e
>>  [<7837135e>] sys_connect+0x72/0x9c
>>  [<78371607>] sock_map_fd+0x41/0x4a
>>  [<7840d1b1>] _spin_lock+0x33/0x3e
>>  [<7840d623>] _spin_unlock+0x25/0x3b
>>  [<78371607>] sock_map_fd+0x41/0x4a
>>  [<78372792>] sys_socketcall+0x8f/0x242
>>  [<7813e99c>] trace_hardirqs_on+0x122/0x14c
>>  [<78103dc6>] sysenter_past_esp+0x8f/0x99
>>  [<78103d96>] sysenter_past_esp+0x5f/0x99
>>  =======================
>> Code: fa e0 00 00 00 75 07 c6 44 24 56 05 eb 14 81 fa f0 00 00 00 0f 84 e1 
>> 02 00 00 84 c0 0f 84 d9 02 00 00 8b 44 24 0c 0d 00 00 00 80 <f6> 86 b0 00 
>> 00 00 08 0f 44 44 24 0c 89 44 24 0c b8 01 00 00 00
>> EIP: [<78395f65>] __ip_route_output_key+0x412/0x722 SS:ESP 0068:d44c7ddc
>> 
>> Shortly before it there was:
>> Oct 17 07:17:55 cougar postfix/master[3400]: warning: process 
>> /usr/lib/postfix/smtpd pid 12479 killed by signal 11
>> 
>> Best regards,
>> 
>>
>>                 Krzysztof Olędzki
>
> Hello Krzysztof
>
> Could you give us some details about this ? kernel version at least.

Yes, I was little to hurry sending this bug report. Anyway, it is 2.6.22.9 
like mentioned in the oops: EFLAGS: 00210286 (2.6.22.9 #1)

> (you could for example take a look at REPORTING-BUGS, or run
> scripts/ver_linux)

Linux cougar 2.6.22.9 #1 SMP PREEMPT Wed Oct 3 10:24:19 CEST 2007 i686 Intel(R) Pentium(R) D CPU 3.20GHz GenuineIntel GNU/Linux

Gnu C                  4.1.2
Gnu make               3.81
binutils               2.17
util-linux             2.12r
mount                  2.12r
module-init-tools      3.2.2
e2fsprogs              1.40.2
Linux C Library        > libc.2.5
Dynamic linker (ldd)   2.5
Procps                 3.2.7
Net-tools              1.60
Kbd                    1.12
Sh-utils               6.9


Best regards,

 				Krzysztof OLędzki