stuck concurrent start

gistfile1.txt

Iteration 66/100 maxfd:3
Executing (create) for 10 containers...
Executing (start) for 10 containers...
Executing (stop) for 10 containers...
Executing (destroy) for 10 containers...

Iteration 67/100 maxfd:3
Executing (create) for 10 containers...
Executing (start) for 10 containers...

** 

root     30616  0.2  0.0  15160   724 ?        Ss   23:11   0:00 lxc-monitord /var/lib/lxc 9
root     16148  0.0  0.4 763056  9224 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16191  0.0  0.0   2260   496 ?        Ss   23:15   0:00  \_ init
root     16253  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16268  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16256  0.0  0.0   2260   272 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16155  0.0  0.4 763060  9232 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16231  0.0  0.0   2260   496 ?        Ss   23:15   0:00  \_ init
root     16347  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16362  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16349  0.0  0.0   2260   272 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16162  0.0  0.4 763052  9228 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16250  0.0  0.0   2260   496 ?        Ss   23:15   0:00  \_ init
root     16333  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16345  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16337  0.0  0.0   2260   272 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16178  0.0  0.4 763060  9252 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16343  0.0  0.0   2260   492 ?        Ss   23:15   0:00  \_ init
root     16392  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16401  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16395  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16197  0.0  0.4 763044  9248 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16382  0.0  0.0   2260   492 ?        Ss   23:15   0:00  \_ init
root     16432  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16440  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16438  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16199  0.0  0.4 763060  9252 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16403  0.0  0.0   2260   492 ?        Ss   23:15   0:00  \_ init
root     16419  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16427  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16424  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16210  0.0  0.4 763044  9256 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16412  0.0  0.0   2260   496 ?        Ss   23:15   0:00  \_ init
root     16470  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16476  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16472  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16220  0.0  0.4 763044  9268 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16430  0.0  0.0   2260   492 ?        Ss   23:15   0:00  \_ init
root     16498  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16503  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16500  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd
root     16221  0.0  0.4 763044  9172 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16229  0.0  0.4 763044  9268 ?        Ss   23:15   0:00 lxc-test-concurrent -j10 -i100
root     16466  0.0  0.0   2260   496 ?        Ss   23:15   0:00  \_ init
root     16505  0.0  0.0   2260   260 ?        Ss   23:15   0:00      \_ /bin/sh /etc/init.d/rcS
root     16510  0.0  0.0   2260   264 ?        S    23:15   0:00      |   \_ /bin/udhcpc
root     16507  0.0  0.0   2260   276 ?        Ss   23:15   0:00      \_ /bin/syslogd

** 

[caglar@oOo:~] sudo gdb -p 16221
(gdb) bt
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f495526515c in _L_lock_982 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007f4955264fab in __GI___pthread_mutex_lock (mutex=0x7f49556d4600 <static_mutex>) at pthread_mutex_lock.c:64
#3  0x00007f49554b27a6 in lock_mutex (l=l@entry=0x7f49556d4600 <static_mutex>) at lxclock.c:78
#4  0x00007f49554b2dac in static_lock () at lxclock.c:330
#5  0x00007f4955498f71 in lxc_global_config_value (option_name=option_name@entry=0x7f49554c02cf "cgroup.use") at utils.c:273
#6  0x00007f495549926c in default_cgroup_use () at utils.c:366
#7  0x00007f49554953bd in lxc_cgroup_load_meta () at cgroup.c:94
#8  0x00007f495548debc in lxc_spawn (handler=handler@entry=0x7f49200af300) at start.c:783
#9  0x00007f495548e7a7 in __lxc_start (name=name@entry=0x7f49200b48a0 "lxc-test-concurrent-4", conf=conf@entry=0x7f49200b2030, ops=ops@entry=0x7f49556d3900 <start_ops>, data=data@entry=0x7f495487db90,
    lxcpath=lxcpath@entry=0x7f49200b2010 "/var/lib/lxc") at start.c:951
#10 0x00007f495548eb9c in lxc_start (name=0x7f49200b48a0 "lxc-test-concurrent-4", argv=argv@entry=0x7f495487dbe0, conf=conf@entry=0x7f49200b2030, lxcpath=0x7f49200b2010 "/var/lib/lxc") at start.c:1048
#11 0x00007f49554b68f1 in lxcapi_start (c=0x7f49200b1dd0, useinit=<optimized out>, argv=0x7f495487dbe0) at lxccontainer.c:648
#12 0x0000000000401317 in do_function (arguments=0x1aa80b0) at concurrent.c:94
#13 0x0000000000401499 in concurrent (arguments=<optimized out>) at concurrent.c:130
#14 0x00007f4955262f6e in start_thread (arg=0x7f495487e700) at pthread_create.c:311
#15 0x00007f4954f8d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
(gdb)