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Old 11-12-2010, 08:25 PM
My LinuxHAList
 
Default kernel bug ?

Hi,

I was using kernel-2.6.18-164.15.1 with no known issues. Then, I updated to:
Linux 2.6.18-194.17.1.el5 #1 SMP Wed Sep 29 12:50:31 EDT 2010 x86_64
x86_64 x86_64 GNU/Linux

I'm aware that there are later updates that patch couple more security bugs.

Here is an issue I run with 2.6.18-194.17.1 and am asking if anyone
hits that kernel bug.

Here are the symptoms:
1) kswapd1 running at 100%, there are not much paging
2) when i logged in, root can't kill -9 ANY processes
3) memory is used up, swap is probably only used up for couple hundred
MBs at most (Swap space has couple Gig available)

I saw in the logs:
kernel: INFO: task sadc:23936 blocked for more than 120 seconds.
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.

Annoyingly, I failed to reproduce the issues.

I tried to reproduce it with the "stress" software package, using up
CPU, memory, etc. But I failed to reproduce those.
Reading later release of kernel did not mention this bug.

If anyone can contribute to what is happening here, that would be great.

Thanks
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Old 11-15-2010, 03:33 AM
Tsuyoshi Nagata
 
Default kernel bug ?

Hi,
(2010/11/13 6:25), My LinuxHAList wrote:
> I saw in the logs:
> kernel: INFO: task sadc:23936 blocked for more than 120 seconds.
> kernel: "echo 0> /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
This message is useless to solve problem without Linux developer.
Every high load and small trouble machine represents this message.
It seems hard disk trouble or memory error.

If your disk has write-error happened, retry sequences will be run at,
firmware(in HDD), physical driver(in Linux), Logical driver(in Linux scsi)
and swapd (in application). Over of 120sec of total these retry sequences,
the kernel prints this message in console.

you have to change some hardware (hard-disk, memory, cpu, mother-board.)
HDD errors and memory errors sometimes be fixed in automatically, You can't
reproduce this errors again.

> Reading later release of kernel did not mention this bug.
Upstream/CentOS community will not release this software fix. :-)

Tsuyoshi

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Old 08-28-2011, 07:23 PM
linux guy
 
Default Kernel bug ?

I get the following when I boot F15 on my Dell Duo.

kernel BUG at drivers/media/media-entity.c 346!
invalid opcode: 0000 [#1] SMP
Modules linked in: snd_hda_codec_conexant uvcvideo(+) microcode(+) snd_hda_intel(+)....


It goes on from there, including a Call Trace.

My Duo won't boot because of this problem.

Its also not displaying the grub kernel selection screen.* It just boots.

It runs F15 Live just fine.


How do I fix this problem or what can I do to work around it ?

Thanks

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Old 08-28-2011, 07:42 PM
Reindl Harald
 
Default Kernel bug ?

Am 28.08.2011 21:23, schrieb linux guy:
> Its also not displaying the grub kernel selection screen. It just boots.

this is the stupid default timeout=0 in "grub.conf"

hit cursor down multiple times from boot start
and you should get it

notice at developers:
please stop hiding everything from the users by default
this is not why most people using linux!


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Old 08-29-2011, 02:34 PM
Mike Chambers
 
Default Kernel bug ?

On Sun, 2011-08-28 at 13:23 -0600, linux guy wrote:
> I get the following when I boot F15 on my Dell Duo.
>
> kernel BUG at drivers/media/media-entity.c 346!
> invalid opcode: 0000 [#1] SMP
> Modules linked in: snd_hda_codec_conexant uvcvideo(+) microcode(+)
> snd_hda_intel(+)....
>
> It goes on from there, including a Call Trace.

Did you get this problem after doing an install, or has this system been
running for few days/weeks/months then just started? Did you install a
new rpm (via from updates and/or testing) or build/compile new kernel
from source? And what kernel are you using?


--
Mike Chambers
Madisonville, KY

"The best town on Earth!"

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Old 08-29-2011, 04:59 PM
linux guy
 
Default Kernel bug ?

You were right about timeout = 0 in grub.conf. * I changed it to 15 and I can now select a kernel again.

The kernel bug error message is appearing when I run kernel 2.6.40.3-o.fc15.

The Duo runs nicely with kernel 2.6.38.6-26.rc1.fc15


Its so nice to have the Duo booting again !*

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Old 08-29-2011, 08:33 PM
"David L. Gehrt"
 
Default Kernel bug ?

<snip>

> this is the stupid default timeout=0 in "grub.conf"
>
> hit cursor down multiple times from boot start
> and you should get it
>
> notice at developers:
> please stop hiding everything from the users by default
> this is not why most people using linux!

Hear, hear!

dlg
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Old 09-08-2011, 09:57 AM
Shiv Manas
 
Default Kernel bug ?

On Tue, Aug 30, 2011 at 4:59 AM, linux guy <linuxguy123@gmail.com> wrote:
> You were right about timeout = 0 in grub.conf. * I changed it to 15 and I
> can now select a kernel again.
>
> The kernel bug error message is appearing when I run kernel 2.6.40.3-o.fc15.
>
> The Duo runs nicely with kernel 2.6.38.6-26.rc1.fc15
>
> Its so nice to have the Duo booting again !
>


I have a similar issue on my Dell M102z. The new kernels just won't
boot at all and I too remember seeing an SMP / opcode error. 2.6.38
and 2.6.39 based kernels work just fine though. I have reported it as
a bug and I suggest you too report it. Also, please post your lspci
and lshw; perhaps we both may have some common hardware (mine is based
on AMD Fusion E-350).

https://bugzilla.redhat.com/show_bug.cgi?id=732222
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