lxc-backup-randomly-hangs-at-suspend-gdb

gdb
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
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(gdb) attach 961
Attaching to process 961
Reading symbols from /usr/bin/lxcfs...Reading symbols from /usr/lib/debug/.build-id/44/48b619bbd976a386ee5cf7c30cc03a7cabc4f7.debug...done.
done.
Reading symbols from /lib/x86_64-linux-gnu/libfuse.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libfuse.so.2
Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libpthread-2.19.so...done.
done.
[New LWP 41916]
[New LWP 63119]
[New LWP 63118]
[New LWP 59470]
[New LWP 22273]
[New LWP 28696]
[New LWP 9292]
[New LWP 2517]
[New LWP 979]
[New LWP 978]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Loaded symbols for /lib/x86_64-linux-gnu/libpthread.so.0
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.19.so...done.
done.
Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.19.so...done.
done.
Loaded symbols for /lib/x86_64-linux-gnu/libdl.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.19.so...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
85      ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Aucun fichier ou dossier de ce type.
(gdb) bt
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x00007fe497b57588 in fuse_session_loop_mt () from /lib/x86_64-linux-gnu/libfuse.so.2
#2  0x00007fe497b5cd27 in fuse_loop_mt () from /lib/x86_64-linux-gnu/libfuse.so.2
#3  0x00007fe497b5f91d in ?? () from /lib/x86_64-linux-gnu/libfuse.so.2
#4  0x0000000000401b4f in main (argc=2, argv=0x7ffca6be0b58) at lxcfs.c:3193
(gdb)