Re: [Libguestfs] Virt-v2v conversion issue
On Tue, Oct 14, 2014 at 03:40:22PM +0000, VONDRA Alain wrote:
Rich,
I've followed your instructions to trace, but I am not very skilful with gdb, maybe I
made a mistake :
(1) As root do:
echo core.%p > /proc/sys/kernel/core_pattern -> OK
(2) Before running virt-v2v, do:
ulimited -c unlimited -> I think it's ulimit -c unlimited
-> -> OK
and you should get a core.* file in the current directory when qemu-img segfaults.
Attach that file to gdb to get a stack trace:
gdb /usr/bin/qemu-img core.XYZ -> Do I need to wait the crash becase
I don't have any core ???
Yes, you have to wait for qemu-img to crash before there will be a
core dump. If it's not crashing, then connect to qemu-img directly,
something like this:
gdb /usr/bin/qemu-img `pidof qemu-img`
and run this command:
(gdb) t a a bt
to show the stack trace in all threads.
If qemu-img is consuming CPU then it's probably not hung.
I'm still interested to find out why fstrim didn't work. Can
you run:
guestfish --ro -d unc-srv-qual03
<fs> run
<fs> part-list /dev/sda
<fs> part-list /dev/sdb
<fs> part-list /dev/sdc
<fs> part-list /dev/sdd
(etc)
I'd be interested to see if the partitions are unaligned, which is the
only reason why fstrim should fail on NTFS.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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