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Re: [Qemu-devel] insmod virtio-blk is broken in qemu 1.0

From: Anthony Liguori
Subject: Re: [Qemu-devel] insmod virtio-blk is broken in qemu 1.0
Date: Sat, 17 Dec 2011 09:13:52 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110831 Lightning/1.0b2 Thunderbird/3.1.13

On 12/17/2011 02:33 AM, Richard W.M. Jones wrote:
On Fri, Dec 16, 2011 at 07:44:10PM -0600, Anthony Liguori wrote:
On 12/16/2011 06:53 PM, Max Filippov wrote:
git bisect says this.  I didn't believe it first time, so I ran it
twice with a few modifications, and it pointed to the same commit both
times ...

could you please elaborate on your testcase and configuration
(host/target architecture, command lines, etc).

Ok, I've found most of details, what's not clear to me is how you
decide whether the build is good or bad.

I mean, you need to rebuild qemu on every bisection step, but neither
this commit nor the previous or the next one
change anything that would compile for x86 targets.

Fairly certain this bisect is a red herring.

tglx reported this the other day in IRC.  He narrowed it down to
virtio-serial.  He was able to reproduce it both with kvm tools and

Yes, we do use virtio-serial.  The command line is:

/home/rjones/d/qemu/qemu.wrapper \
file=/tmp/libguestfs-test-tool-sda-b4hesH,cache=off,format=raw,if=virtio \
     -nodefconfig \
     -machine accel=kvm:tcg \
     -nodefaults \
     -nographic \
     -m 500 \
     -no-reboot \
     -no-hpet \
     -device virtio-serial \
     -serial stdio \

Okay, I can reproduce this now with a F15 guest.

I've narrowed it down to '-nodefaults -serial stdio'. Can you confirm that if you remove those options it works for you?


Anthony Liguori

     -chardev socket,path=/tmp/libguestfsQQ187c/guestfsd.sock,id=channel0 \
     -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
     -kernel /var/tmp/.guestfs-500/kernel.24171 \
     -initrd /var/tmp/.guestfs-500/initrd.24171 \
     -append 'panic=1 console=ttyS0 udevtimeout=300 no_timer_check acpi=off 
printk.time=1 cgroup_disable=memory selinux=0 guestfs_verbose=1 TERM=xterm ' \

which comes from this libguestfs test case:

LIBGUESTFS_QEMU=~/d/qemu/qemu.wrapper libguestfs-test-tool -t 60

where qemu.wrapper is:

#!/bin/sh -
exec $qemudir/x86_64-softmmu/qemu-system-x86_64 -L $qemudir/pc-bios "$@"

I'll try it with/without virtio-serial.

git bisect red herring is pretty strange?


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