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Re: [Qemu-devel] Kernel Panic on Yum update

From: Gerhard Wiesinger
Subject: Re: [Qemu-devel] Kernel Panic on Yum update
Date: Fri, 15 May 2015 16:31:59 +0200
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 15.05.2015 10:10, Paolo Bonzini wrote:

On 15/05/2015 09:37, Gerhard Wiesinger wrote:
Yes, yum takes memory. But there is ~2.2 GB virt memory available. That
should be enough. Therefore I think it is a kernel problem. As in
previous crashes on the mailing list there is a lot of swap available
(2GB) which isn't touched in ANY way.

Under normal conditions without yum:
               total        used        free      shared buff/cache
Mem:         243036      132540       12716       15520 97780       74964
Swap:       2064380           0     2064380
Not all memory is the same.  Some memory cannot be swapped, and some
memory can be swapped to disk without a swap file (e.g. executables).

Yes, I know the different memory types (pageable, non pageable, etc.).

Failing an order 0 allocation is weird indeed, but this is a GFP_ATOMIC
allocation so it's a bit less weird.

Nevertheless the kernel should never go out of non pageable memory if a USER process requires memory (which is of course pageable).


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