On 19/02/2016 10:17, Kevin Wolf wrote: > Am 18.02.2016 um 17:03 hat Laurent Vivier geschrieben: >> Hi, >> >> this commit breaks incoming migration case: >> >> qemu-system-ppc64 XXX -incoming tcp:0:4444 >> qemu-system-ppc64: .../qemu/block/io.c:1304: bdrv_co_do_pwritev: >> Assertion `!(bs->open_flags & 0x0800)' failed. >> >> Without "-incoming", the same command line boots fine. >> >> Are you aware of the problem? > > No, and with no other command line options it works for me: > > $ ppc64-softmmu/qemu-system-ppc64 -incoming tcp::4444 > > I have also tested somewhat more realistic cases on x86 (including > performing actual migrations) before committing the patch, so it's not > generally broken. > > Can you please give the full command line and the stack backtrace? I > think you're seeing a bug where some PPC hardware tries to read (or > access anyway) the image before the migration has completed. This is for > obvious reasons wrong (the contents may still change until the VM is > handed over).
It happens before the migration has started, as soon as I start qemu with "-incoming" parameter. The simplified command line is: qemu-system-ppc64 -drive file=rhel7.2-le.qcow2,format=qcow2,snapshot=on -incoming tcp:0:4444 The problem seems coming from "snapshot=on". Laurent
