[Libguestfs] guestfs_launch gets stuck

[Baochuan Wu]

Thanks Rich.
I have used libguestfs for several month. It worked perfectly before, the
issue appears recently. I am trying guestfs_set_backend (g, "direct").

Thanks,
Allen

2016-08-29 23:31 GMT+08:00 Richard W.M. Jones <rjones at redhat.com>:

> On Mon, Aug 29, 2016 at 11:19:04PM +0800, Baochuan Wu wrote:
> > Thanks Rich for you quick reply. I enabled logs and the program stuck
> > again, here is the call stack and log:
> > Thread 1 (Thread 0x7fac58edc8c0 (LWP 1271)):
> > #0  0x00007fac578fac20 in __poll_nocancel () from /lib64/libc.so.6
> > #1  0x00007fac56df3c5a in virNetClientIOEventLoop () from
> > /lib64/libvirt.so.0
> > #2  0x00007fac56df441b in virNetClientSendInternal () from
> > /lib64/libvirt.so.0
> > #3  0x00007fac56df5843 in virNetClientSendWithReply () from
> > /lib64/libvirt.so.0
> > #4  0x00007fac56df6052 in virNetClientProgramCall () from
> > /lib64/libvirt.so.0
> > #5  0x00007fac56dcbfe2 in callFull.isra.2 () from /lib64/libvirt.so.0
> > #6  0x00007fac56de213d in remoteDomainCreateXML () from
> /lib64/libvirt.so.0
> > #7  0x00007fac56d82151 in virDomainCreateXML () from /lib64/libvirt.so.0
> > #8  0x00007fac58acca50 in launch_libvirt () from /lib64/libguestfs.so.0
> > #9  0x00007fac58ac2b2b in guestfs_impl_launch () from
> /lib64/libguestfs.so.0
> > #10 0x00007fac58a5eba5 in guestfs_launch () from /lib64/libguestfs.so.0
> > #11 0x00000000004117ca in main ()
> ...
> > libguestfs: [62900ms] launch libvirt guest
>
> The error is happening in libvirt's virDomainCreateXML call, called
> from libguestfs here:
>
> https://github.com/libguestfs/libguestfs/blob/master/src/
> launch-libvirt.c#L600
>
> Unfortunately libvirt isn't a simple C library.  It will launch and
> talk to a daemon (usually ``libvirt --timeout=30'' process, if you are
> not running as root).  Debugging into libvirtd is described here:
>
> http://libguestfs.org/guestfs-faq.1.html#debugging-libvirt
>
> A workaround is to set LIBGUESTFS_BACKEND=direct [or use the
> equivalent call ``guestfs_set_backend (g, "direct")''] which will
> cause libguestfs to run qemu directly instead of going through
> libvirt.
>
> http://libguestfs.org/guestfs.3.html#backend
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
> rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>
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