On 24.03.2017 09:56, Mark Cave-Ayland wrote: > On 24/03/17 08:47, Howard Spoelstra wrote: > >> Hi, >> >> Running qemu-system-ppc.exe in windows with the SDL2 GUI results in a >> hangup. I bisected to this commit: >> >> 8bb93c6f99a42c2e0943bc904b283cd622d302c5 is the first bad commit >> commit 8bb93c6f99a42c2e0943bc904b283cd622d302c5 >> Author: Alex Bennée <alex.ben...@linaro.org> >> Date: Wed Mar 15 14:48:25 2017 +0000 >> >> ui/console: ensure graphic updates don't race with TCG vCPUs >> >> Commit 8d04fb55.. >> >> tcg: drop global lock during TCG code execution >> >> ..broke the assumption that updates to the GUI couldn't happen at the >> same time as TCG vCPUs where running. As a result the TCG vCPU could >> still be updating a directly mapped frame-buffer while the display >> side was updating. This would cause artefacts to appear when the >> update code assumed that memory block hadn't changed. >> >> The simplest solution is to ensure the two things can't happen at the >> same time like the old BQL locking scheme. Here we use the solution >> introduced for MTTCG and schedule the update as async_safe_work when >> we know no vCPUs can be running. >> >> Reported-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> >> Signed-off-by: Alex Bennée <alex.ben...@linaro.org> >> Message-id: 20170315144825.3108-1-alex.ben...@linaro.org >> Cc: BALATON Zoltan <bala...@eik.bme.hu> >> Cc: Gerd Hoffmann <kra...@redhat.com> >> Cc: Paolo Bonzini <pbonz...@redhat.com> >> Signed-off-by: Alex Bennée <alex.ben...@linaro.org> >> >> [ kraxel: updated comment clarifying the display adapters are buggy >> and this is a temporary workaround ] >> >> Signed-off-by: Gerd Hoffmann <kra...@redhat.com> > > Hi Howard, > > Alex posted another patch yesterday to resolve a similar issue: > https://lists.nongnu.org/archive/html/qemu-devel/2017-03/msg04474.html. > > Does applying the above patch help at all?
Luigi Burdo reported a similar issue here: https://bugs.launchpad.net/qemu/+bug/1675549 Luigi, could you please try Alex' patch to see whether it fixes your crash? Thanks, Thomas
