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Re: [Qemu-devel] [BUG latest master] - qemu segfaults when issuing scree


From: Lucas Meneghel Rodrigues
Subject: Re: [Qemu-devel] [BUG latest master] - qemu segfaults when issuing screendump cmd
Date: Wed, 17 Apr 2013 15:49:55 -0300

On Tue, 2013-04-16 at 09:39 +0200, Gerd Hoffmann wrote:
> On 04/15/13 18:49, Lucas Meneghel Rodrigues wrote:
> > Latest qemu.git master is failing big time to pass sanity checks:
> > 
> > https://bugs.launchpad.net/qemu/+bug/1169254
> > 
> > We've had some issues with the test jobs, and finally managed to
> > stabilize the grid, so we don't have results for the last couple of
> > weeks to bisect the problem.
> 
> Can you try this?
>   git://git.kraxel.org/qemu rebase/pixman
> 
> [ I'm about to prepare a pull req, was planning
>    to do it last week but got sick ... ]

Yes, in your branch, the problem is solved. Anthony came up with an even
simpler reproducer:

$ (sleep 1; echo -e 'screendump abc.ppm\nquit') | MALLOC_PERTURB_=1 
x86_64-softmmu/qemu-system-x86_64 -monitor stdio -vnc :0
QEMU 1.4.50 monitor - type 'help' for more information
(qemu) screendump abc.ppm
(qemu) quit

With current master, qemu crashes.

address@hidden qemu-gerd]$ (sleep 1; echo -e 'screendump abc.ppm\nquit') | 
MALLOC_PERTURB_=1 x86_64-softmmu/qemu-system-x86_64 -monitor stdio -vnc :0
QEMU 1.4.50 monitor - type 'help' for more information
(qemu) screendump abc.ppm
Segmentation fault





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