crashkernel reservation failed - No suitable area found

crashkernel reservation failed - No suitable area found

[Jay Lan]

Hi,

I searched the web on this subject, and found a discussion thread
on this matter back in March 12, 2012:
     https://lkml.org/lkml/2012/3/13/36
and it seems I hit the same problem on my machine. :-(

We have a system with 4TB memory. When it was shipped, crashkernel
was set to 512M. The crashkernel memory reservation was successful,
but dumping core ran out of memory.  The system runs sles11sp2,
3.0.51-0.7.9.1.

After I tried to raise the reserved memory to 896M, the system started
to fail reserving the requested memory, even after I set it back to 512M:
     crashkernel reservation failed - No suitable area found

Is there a kernel/kexec-tools patch to address this problem in kernel 3.x
yet? Also, according to Takashi Iwa wrote, "the problem does not happen
always. However, once this happens, it continues to happen" :-(
Yes, yes, it drove me completely crazy trying to figure out how to get the
system out of this trapped state! Please help!

Thanks for any help!

Jay



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Re: crashkernel reservation failed - No suitable area found

[Vivek Goyal]

On Wed, Jan 23, 2013 at 06:06:26PM -0800, Jay Lan wrote:
> Hi,
> 
> I searched the web on this subject, and found a discussion thread
> on this matter back in March 12, 2012:
>     https://lkml.org/lkml/2012/3/13/36
> and it seems I hit the same problem on my machine. :-(
> 
> We have a system with 4TB memory. When it was shipped, crashkernel
> was set to 512M. The crashkernel memory reservation was successful,
> but dumping core ran out of memory.  The system runs sles11sp2,
> 3.0.51-0.7.9.1.
> 
> After I tried to raise the reserved memory to 896M, the system started
> to fail reserving the requested memory, even after I set it back to 512M:
>     crashkernel reservation failed - No suitable area found
> 
> Is there a kernel/kexec-tools patch to address this problem in kernel 3.x
> yet? Also, according to Takashi Iwa wrote, "the problem does not happen
> always. However, once this happens, it continues to happen" :-(
> Yes, yes, it drove me completely crazy trying to figure out how to get the
> system out of this trapped state! Please help!

I thought Yinghai Lu worked on some patches to make 512MB reservation
working again. Not sure where these patches are queued and when are
they scheduled to be pushed into linus tree. 

hpa, yinghai should know more.

Thanks
Vivek

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Re: crashkernel reservation failed - No suitable area found

[H. Peter Anvin]

On 01/24/2013 09:07 AM, Vivek Goyal wrote:
>>
>> Is there a kernel/kexec-tools patch to address this problem in kernel 3.x
>> yet? Also, according to Takashi Iwa wrote, "the problem does not happen
>> always. However, once this happens, it continues to happen" :-(
>> Yes, yes, it drove me completely crazy trying to figure out how to get the
>> system out of this trapped state! Please help!
> 
> I thought Yinghai Lu worked on some patches to make 512MB reservation
> working again. Not sure where these patches are queued and when are
> they scheduled to be pushed into linus tree. 
> 
> hpa, yinghai should know more.
> 

Yes, I am working through what I'm *hoping* will be the final version
now.  If all goes well, they will probably be in -tip late tomorrow and
pushed into the 3.9 kernel.  If all *doesn't* go well, it depends on
what the hangups are.

	-hpa



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