[K12OSN] Help diagnosing a kernal panic
Brian Chivers
brian at portsmouth-college.ac.uk
Wed Mar 7 15:58:58 UTC 2007
Thanks I'll give this a go over the easter break, it's the first chance I'll get for a complete
shutdown :-(
Brian
Jim McQuillan wrote:
> Brian,
>
> smbd is a user-space program. It's pretty rare that a user-space
> program can cause a kernel panic, unless it's managed to trip over a bug
> in the kernel.
>
> I'd say it's more likely a hardware issue. First thing I'd do is shut
> down the machine, open it up, and re-seat all of the cards and memory.
> Make sure everything is plugged in securely.
>
> Jim McQuillan
> jam at Ltsp.org
>
>
>
> Brian Chivers wrote:
>> Three times in the last three weeks our main Samba server has tripped
>> over giving the information below in /var/log/messages
>>
>> Mar 7 13:08:50 rho2 kernel: Unable to handle kernel NULL pointer
>> dereference at virtual address 0000000c
>> Mar 7 13:08:50 rho2 kernel: printing eip:
>> Mar 7 13:08:50 rho2 kernel: c01cbbc8
>> Mar 7 13:08:50 rho2 kernel: *pde = 06f1f001
>> Mar 7 13:08:50 rho2 kernel: Oops: 0000 [#1]
>> Mar 7 13:08:50 rho2 kernel: SMP
>> Mar 7 13:08:50 rho2 kernel: Modules linked in: md5 ipv6 autofs4
>> i2c_dev i2c_core sunrpc dm_mod video button battery ac uhci_hcd
>> ehci_hcd e1000 floppy sg ext3
>> jbd mptscsih mptbase sd_mod scsi_mod
>> Mar 7 13:08:50 rho2 kernel: CPU: 2
>> Mar 7 13:08:50 rho2 kernel: EIP: 0060:[<c01cbbc8>] Not tainted VLI
>> Mar 7 13:08:50 rho2 kernel: EFLAGS: 00010207 (2.6.11-1.14_FC3smp)
>> Mar 7 13:08:50 rho2 kernel: EIP is at __rb_rotate_left+0x8/0x3a
>> Mar 7 13:08:50 rho2 kernel: eax: cb457e80 ebx: c0472804 ecx:
>> cb457e80 edx: 00000000
>> Mar 7 13:08:50 rho2 kernel: esi: cb457e80 edi: d98ad500 ebp:
>> c0472804 esp: d230ced0
>> Mar 7 13:08:50 rho2 kernel: ds: 007b es: 007b ss: 0068
>> Mar 7 13:08:50 rho2 kernel: Process smbd (pid: 9477,
>> threadinfo=d230c000 task=f640d020)
>> Mar 7 13:08:50 rho2 kernel: Stack: caadc6c0 c01cbca5 00000000
>> d98ad50c d98ad500 00000e49 c01aa6bc caadc6c0
>> Mar 7 13:08:50 rho2 kernel: d230cf50 00000016 d230cf5e
>> ffffffea c01aa762 0000000e 00000016 00000000
>> Mar 7 13:08:50 rho2 kernel: 00000e49 c0365440 00000e49
>> c0467358 e1bddbc0 e1bddbc0 c01aba60 ffffffff
>> Mar 7 13:08:50 rho2 kernel: Call Trace:
>> Mar 7 13:08:50 rho2 kernel: [<c01cbca5>] rb_insert_color+0x71/0xc4
>> Mar 7 13:08:50 rho2 kernel: [<c01aa6bc>] key_user_lookup+0xfc/0x113
>> Mar 7 13:08:50 rho2 kernel: [<c01aa762>] key_alloc+0x5b/0x2ef
>> Mar 7 13:08:50 rho2 kernel: [<c01aba60>] keyring_alloc+0x28/0x62
>> Mar 7 13:08:50 rho2 kernel: [<c01ad1f1>] alloc_uid_keyring+0x41/0x9f
>> Mar 7 13:08:50 rho2 kernel: [<c012a89a>] alloc_uid+0xaf/0x139
>> Mar 7 13:08:50 rho2 kernel: [<c012e0cb>] set_user+0xb/0x78
>> Mar 7 13:08:50 rho2 kernel: [<c012e45c>] sys_setresuid+0x9b/0x1cd
>> Mar 7 13:08:51 rho2 kernel: [<c0103f0f>] syscall_call+0x7/0xb
>> Mar 7 13:08:51 rho2 kernel: Code: 0c 83 c1 01 83 f9 01 76 ea 31 c0
>> 5bcl c3 b8 01 00 00 00 5b c3 57 b9 45 00 00 00 89 c7 31 c0 f3 ab 5f c3
>> 90 53 89 d3 89 c1 8b
>> 50 08 <8b> 42 0c 85 c0 89 41 08 74 02 89 08 8b 01 89 4a 0c 85 c0 89 02
>>
>> Would you say that it's the smbd process on line 15 that's causing the
>> system to trip over ??
>>
>> The system has been running fine for almost 3 years now so I'm not
>> sure why it has suddenly started doing this, I've not installed any
>> new software or run any updates since it was installed, I know this is
>> bad but it's a Fedora Core 3 box and with the closure of the fedora
>> legecy project it's not that simple to do updates.
>>
>> This is our main Samba server so I'm a little concerned about just
>> trying things as the system also runs our OpenLDAP server so is the
>> "heart of the machine"
>>
>> Any pointers would be gratefully be received.
>>
>> Brian Chivers
>>
>>
>> ------------------------------------------------------------------------
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>> the views of Portsmouth College
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