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[Qemu-devel] How to capture guest %rip from a qemu process without monit

From: Richard W.M. Jones
Subject: [Qemu-devel] How to capture guest %rip from a qemu process without monitor?
Date: Fri, 30 Sep 2011 08:42:51 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

I've finally managed to reproduce a very infrequent kernel boot hang
by forcing TCG (so it runs slower, bug seems to be timing sensitive)
and running a boot test in a loop thousands of times.

I'd like to find out where in the guest kernel this is looping.

Unfortunately I don't have access to the monitor so "info registers"
won't work, but I can attach to the qemu process with gdb.

Which TCG struct contains %rip, other registers?  What other useful
information can be captured using only gdb?



Command line:

qemu-kvm -machine pc,accel=tcg -drive file=/dev/null,if=virtio
-nodefconfig -nodefaults -nographic -m 500 -no-reboot -no-hpet -device
virtio-serial -serial stdio -chardev
-device virtserialport,chardev=channel0,name=org.libguestfs.channel.0
-kernel /home/rjones/d/libguestfs/.guestfs-500/kernel.27140 -initrd
/home/rjones/d/libguestfs/.guestfs-500/initrd.27140 -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' -drive

Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
New in Fedora 11: Fedora Windows cross-compiler. Compile Windows
programs, test, and build Windows installers. Over 70 libraries supprt'd
http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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