From: "Serge E. Hallyn" <serge@hallyn.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] assert and crash on hot-unplug
Date: Thu, 20 Sep 2012 17:00:05 +0000 [thread overview]
Message-ID: <20120920170005.GA25890@mail.hallyn.com> (raw)
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:
serge@ubuntu:~/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
next reply other threads:[~2012-09-20 17:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 17:00 Serge E. Hallyn [this message]
2012-09-21 12:52 ` [Qemu-devel] assert and crash on hot-unplug Anthony Liguori
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120920170005.GA25890@mail.hallyn.com \
--to=serge@hallyn.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).