Killall does nothing the process is still alive... If I do kill -9, do I get a core dump ? Each time I got this hang, I find only umount -f /tmp/xxxx to force qemu-img to stop. Alain
-----Message d'origine----- De : Richard W.M. Jones [mailto:rjo...@redhat.com] Envoyé : mercredi 15 octobre 2014 14:41 À : VONDRA Alain Cc : libguestfs@redhat.com Objet : Re: [Libguestfs] Virt-v2v conversion issue On Wed, Oct 15, 2014 at 12:23:17PM +0000, VONDRA Alain wrote: > Now, the conversion hangs on the first disk at 54,03/100%, here is the gdb > result : OK I just talked to Paolo about this, and it's fairly serious. Can you get a core dump from this? You will need to set up the ulimit etc as outlined in the previous email: https://www.redhat.com/archives/libguestfs/2014-October/msg00102.html then run the conversion until it hangs, then 'killall -BUS qemu-img' which should cause qemu-img to drop a core dump file. You can send me (privately) the core dump and I will open a BZ about this and ensure that the necessary people see this. Thanks, Rich. > (gdb) t a a bt > > Thread 2 (Thread 0x7f0f3cea9700 (LWP 9583)): > #0 sem_timedwait () at > ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S:101 > #1 0x00007f0f45b765e7 in qemu_sem_timedwait () > #2 0x00007f0f45b0750c in worker_thread () > #3 0x00007f0f4203bdf3 in start_thread (arg=0x7f0f3cea9700) at > pthread_create.c:308 > #4 0x00007f0f41d6901d in clone () at > ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 > > Thread 1 (Thread 0x7f0f45aa88c0 (LWP 9582)): > #0 0x00007f0f41d5eb0f in __GI_ppoll (fds=0x7f0f470d7a00, nfds=1, > timeout=<optimized out>, sigmask=0x0) at > ../sysdeps/unix/sysv/linux/ppoll.c:56 > #1 0x00007f0f45b146db in qemu_poll_ns () > #2 0x00007f0f45b15430 in aio_poll () > #3 0x00007f0f45b0eedd in bdrv_prwv_co () > #4 0x00007f0f45b0efd3 in bdrv_rw_co () > #5 0x00007f0f45b05b35 in img_convert () > #6 0x00007f0f41c94af5 in __libc_start_main (main=0x7f0f45b01e80 <main>, > argc=10, ubp_av=0x7fff19cb3ab8, init=<optimized out>, fini=<optimized out>, > rtld_fini=<optimized out>, stack_end=0x7fff19cb3aa8) at > libc-start.c:274 > #7 0x00007f0f45b022ed in _start () > > Alain > > -----Message d'origine----- > De : Richard W.M. Jones [mailto:rjo...@redhat.com] Envoyé : mardi 14 > octobre 2014 22:52 À : VONDRA Alain Cc : libguestfs@redhat.com Objet : > 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 Read my programming and > virtualization blog: http://rwmj.wordpress.com virt-builder quickly > builds VMs from scratch http://libguestfs.org/virt-builder.1.html -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://www.redhat.com/mailman/listinfo/libguestfs