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[Qemu-devel] assert and crash on hot-unplug
From: |
Serge E. Hallyn |
Subject: |
[Qemu-devel] assert and crash on hot-unplug |
Date: |
Thu, 20 Sep 2012 17:00:05 +0000 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
Hi,
a regression test of CVE-2011-1751 (fixed by
505597e4476a6bc219d0ec1362b760d71cb4fdca) found that when writing 2 to
0xae08, qemu-system-i386 crashes with
ERROR:qom/object.c:386:object_finalize: assertion failed: (obj->ref == 0)
A simple way to reproduce this (in qemu 1.1 or 1.2) is:
address@hidden:~/qa-regression-testing/scripts$
~/src/qemu/i386-softmmu/qemu-system-i386 -usb -monitor stdio -vnc :1 -hda x.img
QEMU 1.2.50 monitor - type 'help' for more information
(qemu) o 0xae08 2
**
ERROR:qom/object.c:386:object_finalize: assertion failed: (obj->ref == 0)
Aborted (core dumped)
I don't think it's a regression of the CVE, as some added printfs show it is
the usb controller which is being unplugged (dev 1, fn 2, not dev 1 fn 3).
Bus 0, device 1, function 2:
USB controller: PCI device 8086:7020
IRQ 11.
BAR4: I/O at 0xc040 [0xc05f].
id ""
Bus 0, device 1, function 3:
Bridge: PCI device 8086:7113
IRQ 9.
id ""
-serge
- [Qemu-devel] assert and crash on hot-unplug,
Serge E. Hallyn <=