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[linux-lvm] lvm_vg_create_lv_linear() stuck in dm_udev_wait()



Greetings all,
on stock ubuntu natty, using liblvm 2.02.66, sometimes
lvm_vg_create_lv_linear () gets stuck in the following stack.

#0  0x00007f3b9636a0f7 in semop () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f3b9606863c in dm_udev_wait () from /lib/libdevmapper.so.1.02.1
#2  0x00007f3b973df41b in ?? () from /lib/liblvm2app.so.2.2
#3  0x00007f3b973e012e in ?? () from /lib/liblvm2app.so.2.2
#4  0x00007f3b97399aec in ?? () from /lib/liblvm2app.so.2.2
#5  0x00007f3b9739b02b in ?? () from /lib/liblvm2app.so.2.2
#6  0x00007f3b9739bb7e in ?? () from /lib/liblvm2app.so.2.2
#7  0x00007f3b973e4c51 in ?? () from /lib/liblvm2app.so.2.2
#8  0x00007f3b973b9238 in ?? () from /lib/liblvm2app.so.2.2
#9  0x00007f3b973b9e36 in ?? () from /lib/liblvm2app.so.2.2
#10 0x00007f3b973c2118 in ?? () from /lib/liblvm2app.so.2.2
#11 0x00007f3b973989ba in lvm_vg_create_lv_linear () from /lib/liblvm2app.so.2.2
...

I realize that somehow it is related to udev synchronization. In my
application, I have a udev monitor for "block" subsystem type, but
currently it does nothing with the events it receives (it calls
udev_monitor_receive_device(), udev_device_get_action() and then
udev_device_unref() for every event. I plan in the future to use it
for waking up other threads.

Can somebody pls advise on how to investigate this issue. It does not
happen always.

Thanks,
   Alex.


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