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Date: Sat, 16 Jun 2012 02:41:41 +0200
From: =?ISO-8859-15?Q?Andreas_F=E4rber?= <afaerber@suse.de>
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Subject: [Qemu-devel] [qom-next] Bisecting virtio-scsi issue
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To: Anthony Liguori <anthony@codemonkey.ws>, mengcong <mc@linux.vnet.ibm.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>

Hi,

After multiple runs of not-so-successful bisecting, it appears as if the
qom-next commit "qbus: Make child devices links" [1] is causing
assertions for both virtio-scsi and ahci but not for qemu-system-x86_64
without parameters:

$ x86_64-softmmu/qemu-system-x86_64 -enable-kvm -device
virtio-scsi-pci,id=3Dmcbus
qemu-system-x86_64: /home/andreas/QEMU/qemu-rcar/memory.c:1259:
memory_region_add_subregion_common: Assertion `!subregion->parent' failed=
.

$ x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1G -boot menu=3Don
-drive file=3D../openSUSE-12.1-DVD-x86_64.iso,if=3Dnone,id=3Didecd,readon=
ly=3Don
-device ide-cd,bus=3Dide.0,drive=3Didecd -device ahci,id=3Dahci -device
ide-cd,bus=3Dahci.0,drive=3Dahcicd -drive
file=3D../openSUSE-12.1-GNOME-LiveCD-x86_64.iso,if=3Dnone,id=3Dahcicd,rea=
donly=3Don
qemu-system-x86_64: /home/andreas/QEMU/qemu-rcar/memory.c:1259:
memory_region_add_subregion_common: Assertion `!subregion->parent' failed=
.

qemu.git appears to be okay. But I also got quite a few segfaults during
the bisects that I had to skip (I believe mengcong was already tracking
down some virtio write error), so I'll recheck without git-bisect and
doing fully clean rebuilds tomorrow if nobody has any insights.

Cheers,
Andreas

[1] http://repo.or.cz/w/qemu/afaerber.git/shortlog/refs/heads/qom-next-2

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