[SOLVED] Ubuntu server: kernel panic

broxtor · 09-20-2011, 12:32 PM

Hi,

I have a Ubuntu 11.04 server running that freezes randomly. That is, I have not been able to determine why it freezes. When this happens a lot of (debug?) information appears in the console.

The information that appears in the console also appears in kern.log:

Code:

Sep 20 18:10:46 Troll kernel: [ 2206.785255] Call Trace:
Sep 20 18:10:46 Troll kernel: [ 2206.785286]  [<ffffffff8111bcf9>] ? shrink_slab+0x89/0x180
Sep 20 18:10:46 Troll kernel: [ 2206.785317]  [<ffffffff8111edcd>] balance_pgdat+0x52d/0x6e0
Sep 20 18:10:46 Troll kernel: [ 2206.785348]  [<ffffffff8111f06a>] kswapd+0xea/0x1d0
Sep 20 18:10:46 Troll kernel: [ 2206.785376]  [<ffffffff8111ef80>] ? kswapd+0x0/0x1d0
Sep 20 18:10:46 Troll kernel: [ 2206.785404]  [<ffffffff81087276>] kthread+0x96/0xa0
Sep 20 18:10:46 Troll kernel: [ 2206.785435]  [<ffffffff8100cde4>] kernel_thread_helper+0x4/0x10
Sep 20 18:10:46 Troll kernel: [ 2206.785465]  [<ffffffff810871e0>] ? kthread+0x0/0xa0
Sep 20 18:10:46 Troll kernel: [ 2206.785492]  [<ffffffff8100cde0>] ? kernel_thread_helper+0x0/0x10
Sep 20 18:10:46 Troll kernel: [ 2206.785518] Code:  Bad RIP value.
Sep 20 18:10:46 Troll kernel: [ 2206.785550] RIP  [<          (null)>]           (null)
Sep 20 18:10:46 Troll kernel: [ 2206.785578]  RSP <ffff880078b57d38>
Sep 20 18:10:46 Troll kernel: [ 2206.785600] CR2: 0000000000000000
Sep 20 18:10:46 Troll kernel: [ 2206.785870] ---[ end trace edd8c4931b8046ea ]---
Sep 20 18:10:47 Troll kernel: [ 2206.929021] BUG: unable to handle kernel NULL pointer dereference at           (null)
Sep 20 18:10:47 Troll kernel: [ 2206.929143] IP: [<          (null)>]           (null)
Sep 20 18:10:47 Troll kernel: [ 2206.929216] PGD 71837067 PUD 71561067 PMD 0 
Sep 20 18:10:47 Troll kernel: [ 2206.929332] Oops: 0010 [#2] SMP 
Sep 20 18:10:47 Troll kernel: [ 2206.929420] last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
Sep 20 18:10:47 Troll kernel: [ 2206.929484] CPU 0 
Sep 20 18:10:47 Troll kernel: [ 2206.929512] Modules linked in: nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc ppdev i915 parport_pc drm_kms_helper drm i2c_algo_bit video lp parport 8139too 8139cp
Sep 20 18:10:47 Troll kernel: [ 2206.930027] 
Sep 20 18:10:47 Troll kernel: [ 2206.930027] Pid: 1281, comm: miniserv.pl Tainted: G      D     2.6.38-11-server #48-Ubuntu O.E.M O.E.M/45CS/45CSX
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RSP: 0000:ffff8800714c3a20  EFLAGS: 00010246
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RAX: ffff88007a0b9590 RBX: ffff88007a0b9580 RCX: 0000000000000002
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RDX: 00000000000200da RSI: 0000000000000000 RDI: ffff88007a0b9580
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RBP: ffff8800714c3a68 R08: 00000000000006a4 R09: 0000000000000100
Sep 20 18:10:47 Troll kernel: [ 2206.930027] R10: dead000000200200 R11: 0000000000000000 R12: 0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.930027] R13: 0000000000000000 R14: 00000000000200da R15: 0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.930027] FS:  00007faf46a0a720(0000) GS:ffff88007f400000(0000) knlGS:0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.930027] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 20 18:10:47 Troll kernel: [ 2206.930027] CR2: 0000000000000000 CR3: 0000000071b09000 CR4: 00000000000006f0
Sep 20 18:10:47 Troll kernel: [ 2206.930027] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.930027] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Sep 20 18:10:47 Troll kernel: [ 2206.930027] Process miniserv.pl (pid: 1281, threadinfo ffff8800714c2000, task ffff88007a7fdb80)
Sep 20 18:10:47 Troll kernel: [ 2206.930027] Stack:
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  ffffffff8111bcf9 000000000007435f 000000000000019c 0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  ffff8800714c3af8 000000000000000c 0000000000000000 0000000001320122
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  ffff88007f7bcc00 ffff8800714c3ad8 ffffffff8111e3f7 ffff88007a7fe208
Sep 20 18:10:47 Troll kernel: [ 2206.930027] Call Trace:
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff8111bcf9>] ? shrink_slab+0x89/0x180
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff8111e3f7>] do_try_to_free_pages+0x217/0x2d0
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff8111e707>] try_to_free_pages+0x87/0x110
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff81113cf4>] __alloc_pages_nodemask+0x484/0x830
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff8114ba9a>] alloc_pages_vma+0x9a/0x150
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff8112db14>] do_wp_page+0x1c4/0x770
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff811834a6>] ? mntput_no_expire+0x36/0xf0
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff811300bb>] handle_pte_fault+0x1db/0x210
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff81131348>] handle_mm_fault+0x158/0x260
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff815dbc42>] do_page_fault+0x1a2/0x540
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff81169d8a>] ? sys_newstat+0x2a/0x40
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  [<ffffffff815d86d5>] page_fault+0x25/0x30
Sep 20 18:10:47 Troll kernel: [ 2206.930027] Code:  Bad RIP value.
Sep 20 18:10:47 Troll kernel: [ 2206.930027] RIP  [<          (null)>]           (null)
Sep 20 18:10:47 Troll kernel: [ 2206.930027]  RSP <ffff8800714c3a20>
Sep 20 18:10:47 Troll kernel: [ 2206.930027] CR2: 0000000000000000
Sep 20 18:10:47 Troll kernel: [ 2206.932525] ---[ end trace edd8c4931b8046eb ]---

This appears a couple of times and then a kernel panic occurs, which obviously leaves the system completely unresponsive.

Some (perhaps) useful information:
uname -r:

Code:

2.6.38-11-server

During boot the following errors appear:

Code:

[drm:init_ring_common] *ERROR* failed to set render ring head to zero ctl ffffffff head ffffffff tail ffffffff start ffffffff
[drm:init_ring_common] *ERROR* render ring initialization failed ctl ffffffff head ffffffff tail ffffffff start ffffffff
[drm:i915_driver_load] *ERROR* failed to init modeset

Does anyone know what is wrong here? Or how I could determine that?

Thnx!

ButterflyMelissa · 09-20-2011, 12:47 PM

Yo

Kernel panics - escpecially random ones that cannot (clearly) be related to software/activity on the box - could be a sign of hardware failure.

Maybe a humble suggestion: try to run a live CD on the box with something (anything) and see if the thing still freaks out. If not, then it's the install...

At least with that info you can edge towards answers!

Good luck

Thor

broxtor · 09-26-2011, 11:55 AM

First of all, Thor thanks for your reply.
After some fiddling around I retraced my steps and came to the conclusion that my troubles started after upgrading to Ubuntu 11.04. From that moment on, I got errors during boot about i915 chip. Google didn't supply me with any useful hits on this.
But to make reasonably sure that my memory was ok, I run a memtest86+ and that didn't return any errors. So I decided to downgrade to Ubuntu 10.04 LTS and my box is already running without a problem for two days now. So it seems my problem is solved now.

ButterflyMelissa · 09-26-2011, 04:41 PM

Yo!

Thanks for posting the solution! I'm convinced it'll help someone!

Glad to read things picked up again!

Grtz!

Thor

widget · 09-26-2011, 05:40 PM

You really should mark this as solved (under thread tools at top of page). May not be the solution you sere looking for but it is a solution.