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Old 11-04-2008, 11:43 AM
David Relson
 
Default Kernel BUG

For about a week, my workstation has been crashing every day or so.
Typically it happens late at night while BackupPC is backing up a hard
drive. With "tail -F /var/log/messages" running I saw EXT3 mentioned a
few days ago and started suspecting a hard drive problem.

Last night it happened again. This time my "tail ..." window was
opened full screen so I saw all the messages and know more. Here's
part of what I wrote down (until I got tired of writing):

BUG unable to handle kernel NULL pointer dereference at 0000008
IP ffffff8027ce14 free_block+0xb4/0x160
PGD 11b638067 PUD 11b631067 PMD 0
Oops 0002[1]SMP
...
Call Trace
8027cac0 cache_flusharray+0x60/0xe0
8027cc46 kmem_cache_free

I'm running a 2.6.25-gentoo-r7

To learn more about what's happening (and to more easily record
all the kernel messages), I'm now running "tail -F /var/log/messages"
from a second machine (via an SSH session).

Questions:

Is there a better way to capture the full BUG output???
Once I have the full BUG output, what's the next useful thing to do?

Thanks!

David
 
Old 11-04-2008, 12:17 PM
"Hazen Valliant-Saunders"
 
Default Kernel BUG

join the lkml (linux kernel mailing list) and let them know about it?

On Tue, Nov 4, 2008 at 7:43 AM, David Relson <relson@osagesoftware.com> wrote:

For about a week, my workstation has been crashing every day or so.

Typically it happens late at night while BackupPC is backing up a hard

drive. With "tail -F /var/log/messages" running I saw EXT3 mentioned a

few days ago and started suspecting a hard drive problem.



Last night it happened again. *This time my "tail ..." window was

opened full screen so I saw all the messages and know more. *Here's

part of what I wrote down (until I got tired of writing):



*BUG unable to handle kernel NULL pointer dereference at 0000008

*IP * ffffff8027ce14 free_block+0xb4/0x160

*PGD 11b638067 PUD 11b631067 PMD 0

*Oops 0002[1]SMP

*...

*Call Trace

* * 8027cac0 cache_flusharray+0x60/0xe0

* * 8027cc46 kmem_cache_free



I'm running a 2.6.25-gentoo-r7



To learn more about what's happening (and to more easily record

all the kernel messages), I'm now running "tail -F /var/log/messages"

from a second machine (via an SSH session).



Questions:



*Is there a better way to capture the full BUG output???

*Once I have the full BUG output, what's the next useful thing to do?



Thanks!



David







--
Hazen Valliant-Saunders
IT/IS Consultant
(613) 355-5977
 
Old 11-04-2008, 12:33 PM
"Jorge Peixoto de Morais Neto"
 
Default Kernel BUG

>>
>> For about a week, my workstation has been crashing every day or so.
>> Typically it happens late at night while BackupPC is backing up a hard
>> drive. With "tail -F /var/log/messages" running I saw EXT3 mentioned a
>> few days ago and started suspecting a hard drive problem.
>>
>> Last night it happened again. This time my "tail ..." window was
>> opened full screen so I saw all the messages and know more. Here's
>> part of what I wrote down (until I got tired of writing):
>>
>> BUG unable to handle kernel NULL pointer dereference at 0000008
>> IP ffffff8027ce14 free_block+0xb4/0x160
>> PGD 11b638067 PUD 11b631067 PMD 0
>> Oops 0002[1]SMP
>> ...
>> Call Trace
>> 8027cac0 cache_flusharray+0x60/0xe0
>> 8027cc46 kmem_cache_free
>>
>> I'm running a 2.6.25-gentoo-r7
>>
>> To learn more about what's happening (and to more easily record
>> all the kernel messages), I'm now running "tail -F /var/log/messages"
>> from a second machine (via an SSH session).
>>
>> Questions:
>>
>> Is there a better way to capture the full BUG output???
>> Once I have the full BUG output, what's the next useful thing to do?
>>

> join the lkml (linux kernel mailing list) and let them know about it?
>

For a patched kernel like gentoo-sources, wouldn't it be appropriate
better to file a bug report at Gentoo's bugzilla?
 
Old 11-04-2008, 12:36 PM
Zhang Le
 
Default Kernel BUG

On 07:43 Tue 04 Nov , David Relson wrote:
...
>
> Questions:
>
> Is there a better way to capture the full BUG output???
> Once I have the full BUG output, what's the next useful thing to do?

Chances are the bug has already been fixed in later version.
Before you send the bug report, I suggest you to try a more recent version and
see if the bug disappears.

If you are interested in find the cause yourself, you can take a look at this:
/usr/src/linux/Documentation/oops-tracing.txt

Zhang, Le
 
Old 11-04-2008, 12:40 PM
David Relson
 
Default Kernel BUG

On Tue, 4 Nov 2008 11:33:09 -0200
Jorge Peixoto de Morais Neto wrote:

> >>
> >> For about a week, my workstation has been crashing every day or so.
> >> Typically it happens late at night while BackupPC is backing up a
> >> hard drive. With "tail -F /var/log/messages" running I saw EXT3
> >> mentioned a few days ago and started suspecting a hard drive
> >> problem.

... [snip]....

> >>
> >> Is there a better way to capture the full BUG output???
> >> Once I have the full BUG output, what's the next useful thing to
> >> do?
> >>
>
> > join the lkml (linux kernel mailing list) and let them know about
> > it?
> >
>
> For a patched kernel like gentoo-sources, wouldn't it be appropriate
> better to file a bug report at Gentoo's bugzilla?

At the moment I'm trying to capture the full BUG output. Once I have
that, I'll report it and (likely) switch to a different kernel
version with hopes of having a reliable system once again.


David
 
Old 11-04-2008, 04:01 PM
Volker Armin Hemmann
 
Default Kernel BUG

On Dienstag 04 November 2008, David Relson wrote:
> On Tue, 4 Nov 2008 11:33:09 -0200
>
> Jorge Peixoto de Morais Neto wrote:
> > >> For about a week, my workstation has been crashing every day or so.
> > >> Typically it happens late at night while BackupPC is backing up a
> > >> hard drive. With "tail -F /var/log/messages" running I saw EXT3
> > >> mentioned a few days ago and started suspecting a hard drive
> > >> problem.
>
> ... [snip]....
>
> > >> Is there a better way to capture the full BUG output???
> > >> Once I have the full BUG output, what's the next useful thing to
> > >> do?
> > >
> > > join the lkml (linux kernel mailing list) and let them know about
> > > it?
> >
> > For a patched kernel like gentoo-sources, wouldn't it be appropriate
> > better to file a bug report at Gentoo's bugzilla?
>
> At the moment I'm trying to capture the full BUG output. Once I have
> that, I'll report it and (likely) switch to a different kernel
> version with hopes of having a reliable system once again.
>
>
> David

install vanilla-sources.
if crash happens again, report to lkml. Joining is not necessary nor
recommended.
 
Old 04-05-2010, 12:19 PM
Gilberto Nunes
 
Default Kernel BUG

Hi....





I get this messages from kernel:



Apr* 5 09:19:03 zebra kernel: BUG: warning at lib/kref.c:32/kref_get()
(Not tainted)

Apr* 5 09:19:03 zebra kernel:

Apr* 5 09:19:03 zebra kernel: Call Trace:

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8023824d>]
kref_get+0x38/0x3d

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8025a440>]
kobject_get+0x12/0x17

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8024b57f>]
blk_get_queue+0x1f/0x26

Apr* 5 09:19:03 zebra kernel:* [<ffffffff887198f7>]
:blkbk:dispatch_rw_block_io+0x4db/0x5a2

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80340368>]
__next_cpu+0x19/0x28

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8026082b>]
error_exit+0x0/0x6e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8028792a>]
find_busiest_group+0x1db/0x44d

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80262dd3>]
thread_return+0x6c/0x113

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8026082b>]
error_exit+0x0/0x6e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80340af5>]
kobject_cleanup+0x39/0x7e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff88719d2c>]
:blkbk:blkif_schedule+0x36e/0x456

Apr* 5 09:19:03 zebra kernel:* [<ffffffff887199be>]
:blkbk:blkif_schedule+0x0/0x456

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8029bdab>]
keventd_create_kthread+0x0/0xc4

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80233bef>]
kthread+0xfe/0x132

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80260b2c>]
child_rip+0xa/0x12

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8029bdab>]
keventd_create_kthread+0x0/0xc4

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80233af1>]
kthread+0x0/0x132

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80260b22>]
child_rip+0x0/0x12



What is this and how to fix it??



Thanks

--

Gilberto
Nunes Ferreira

Suporte
T.I.

Selbetti
Gestão de Documentos

(47)
3441-6004 / (47) 8861-6672

Fax
(47) 3441-6021

gilberto.nunes@selbetti.com.br










_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 04-05-2010, 01:30 PM
aditya hilman
 
Default Kernel BUG

On Mon, Apr 5, 2010 at 7:19 PM, Gilberto Nunes <gilberto.nunes@selbetti.com.br> wrote:






Hi....





I get this messages from kernel:



Apr* 5 09:19:03 zebra kernel: BUG: warning at lib/kref.c:32/kref_get()
(Not tainted)

Apr* 5 09:19:03 zebra kernel:

Apr* 5 09:19:03 zebra kernel: Call Trace:

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8023824d>]
kref_get+0x38/0x3d

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8025a440>]
kobject_get+0x12/0x17

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8024b57f>]
blk_get_queue+0x1f/0x26

Apr* 5 09:19:03 zebra kernel:* [<ffffffff887198f7>]
:blkbk:dispatch_rw_block_io+0x4db/0x5a2

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80340368>]
__next_cpu+0x19/0x28

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8026082b>]
error_exit+0x0/0x6e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8028792a>]
find_busiest_group+0x1db/0x44d

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80262dd3>]
thread_return+0x6c/0x113

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8026082b>]
error_exit+0x0/0x6e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80340af5>]
kobject_cleanup+0x39/0x7e

Apr* 5 09:19:03 zebra kernel:* [<ffffffff88719d2c>]
:blkbk:blkif_schedule+0x36e/0x456

Apr* 5 09:19:03 zebra kernel:* [<ffffffff887199be>]
:blkbk:blkif_schedule+0x0/0x456

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8029bdab>]
keventd_create_kthread+0x0/0xc4

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80233bef>]
kthread+0xfe/0x132

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80260b2c>]
child_rip+0xa/0x12

Apr* 5 09:19:03 zebra kernel:* [<ffffffff8029bdab>]
keventd_create_kthread+0x0/0xc4

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80233af1>]
kthread+0x0/0x132

Apr* 5 09:19:03 zebra kernel:* [<ffffffff80260b22>]
child_rip+0x0/0x12



What is this and how to fix it??



Thanks

--

Gilberto
Nunes Ferreira

Suporte
T.I.

Selbetti
Gestão de Documentos

(47)
3441-6004 / (47) 8861-6672

Fax
(47) 3441-6021

gilberto.nunes@selbetti.com.br











_______________________________________________

CentOS mailing list

CentOS@centos.org

http://lists.centos.org/mailman/listinfo/centos




this is in VM right?
on my machine, i just upgrade the memory and cpu.
--
Regards,
Adit



_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 04-05-2010, 01:57 PM
Gilberto Nunes
 
Default Kernel BUG

Hi

This message appears on host not in VM....

Thanks

aditya hilman escreveu:
>
>
> On Mon, Apr 5, 2010 at 7:19 PM, Gilberto Nunes
> <gilberto.nunes@selbetti.com.br
> <mailto:gilberto.nunes@selbetti.com.br>> wrote:
>
> Hi....
>
>
> I get this messages from kernel:
>
> Apr 5 09:19:03 zebra kernel: BUG: warning at
> lib/kref.c:32/kref_get() (Not tainted)
> Apr 5 09:19:03 zebra kernel:
> Apr 5 09:19:03 zebra kernel: Call Trace:
> Apr 5 09:19:03 zebra kernel: [<ffffffff8023824d>] kref_get+0x38/0x3d
> Apr 5 09:19:03 zebra kernel: [<ffffffff8025a440>]
> kobject_get+0x12/0x17
> Apr 5 09:19:03 zebra kernel: [<ffffffff8024b57f>]
> blk_get_queue+0x1f/0x26
> Apr 5 09:19:03 zebra kernel: [<ffffffff887198f7>]
> :blkbk:dispatch_rw_block_io+0x4db/0x5a2
> Apr 5 09:19:03 zebra kernel: [<ffffffff80340368>]
> __next_cpu+0x19/0x28
> Apr 5 09:19:03 zebra kernel: [<ffffffff8026082b>]
> error_exit+0x0/0x6e
> Apr 5 09:19:03 zebra kernel: [<ffffffff8028792a>]
> find_busiest_group+0x1db/0x44d
> Apr 5 09:19:03 zebra kernel: [<ffffffff80262dd3>]
> thread_return+0x6c/0x113
> Apr 5 09:19:03 zebra kernel: [<ffffffff8026082b>]
> error_exit+0x0/0x6e
> Apr 5 09:19:03 zebra kernel: [<ffffffff80340af5>]
> kobject_cleanup+0x39/0x7e
> Apr 5 09:19:03 zebra kernel: [<ffffffff88719d2c>]
> :blkbk:blkif_schedule+0x36e/0x456
> Apr 5 09:19:03 zebra kernel: [<ffffffff887199be>]
> :blkbk:blkif_schedule+0x0/0x456
> Apr 5 09:19:03 zebra kernel: [<ffffffff8029bdab>]
> keventd_create_kthread+0x0/0xc4
> Apr 5 09:19:03 zebra kernel: [<ffffffff80233bef>] kthread+0xfe/0x132
> Apr 5 09:19:03 zebra kernel: [<ffffffff80260b2c>] child_rip+0xa/0x12
> Apr 5 09:19:03 zebra kernel: [<ffffffff8029bdab>]
> keventd_create_kthread+0x0/0xc4
> Apr 5 09:19:03 zebra kernel: [<ffffffff80233af1>] kthread+0x0/0x132
> Apr 5 09:19:03 zebra kernel: [<ffffffff80260b22>] child_rip+0x0/0x12
>
> What is this and how to fix it??
>
> Thanks
> --
> Gilberto Nunes Ferreira
> *Suporte T.I.*
> *Selbetti Gestão de Documentos*
> *(47) 3441-6004 / (47) 8861-6672*
> *Fax (47) 3441-6021*
> /*gilberto.nunes@selbetti.com.br
> <mailto:gilberto.nunes@selbetti.com.br>*/
>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org <mailto:CentOS@centos.org>
> http://lists.centos.org/mailman/listinfo/centos
>
>
>
> this is in VM right?
> on my machine, i just upgrade the memory and cpu.
>
> --
> Regards,
> Adit
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

--
Gilberto Nunes Ferreira
*Suporte T.I.*
*Selbetti Gestão de Documentos*
*(47) 3441-6004 / (47) 8861-6672*
*Fax (47) 3441-6021*
/*gilberto.nunes@selbetti.com.br*/


_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 04-07-2010, 01:09 AM
Tsuyoshi Nagata
 
Default Kernel BUG

(2010/04/05 22:57), Gilberto Nunes wrote:
> Apr 5 09:19:03 zebra kernel: [<ffffffff8029bdab>]
>> keventd_create_kthread+0x0/0xc4

Its possible on VM and host kernel with in-sufficient memory.
buy more memory :-))

-Tsuyoshi
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 

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