[Pkg-uml-pkgs] Bug#741075: user-mode-linux: Occasional memory corruption on startup under high load

[Anton Ivanov]

On 09/03/14 21:35, Mattia Dongili wrote:
> On Sat, Mar 08, 2014 at 07:04:56AM +0000, Anton Ivanov wrote:
>> Package: user-mode-linux
>> Version: 3.2-2um-1+deb7u2+b1
>> Severity: grave
>> Tags: patch
>> Justification: causes non-serious data loss
>>
>> Dear Maintainer,
>>
>> This bug is perennial. If we go through old bugs with
>> "cannot reproduce" tag 50% of them are this one, the other
>> 50% are the "you should not use pipe for interprocess IPC"
>> which we will submit shortly.
>>
>> Manifestation of the problem - UML dies on startup for no
>> reason with a memory corruption message. Occurs only on
>> heavily loaded systems and usually when running a lot of
>> UMLs.
> Thanks for the patch.
> I have noticed that you submitted these patch-set (together with the
> other two you sent here and more) upstream and they will be in the
> stable branch.
> The easiest path here is also to go through the stable release of
> linux-source where uml is built from. I'll keep an eye on the stable
> tree but it'd be very helpful if you could add the stable tree commit
> ids once the patches get included. Same story for the other two bugs.

All 3 bugs have now patches submitted upstream. I have submitted our 
other improvements as well.

While they do not make a speed daemon of uml userspace they get it 
reasonably close to kvm. Kernel itself is now faster than qemu-kvm for 
most networking stuff.

A.

>
> Thanks!