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Re: [libvirt] libvirt 3.5.0 locks



On Thu, Aug 24, 2017 at 02:31:05PM +0300, Vasiliy Tolstov wrote:
Another lock with libvirt 3.5.0

root cn12:~# gdb -batch -p $(pgrep libvirtd) -ex 't a a bt'

warning: Unable to find libthread_db matching inferior's thread
library, thread debugging will not be available.
0x00007f95b5d4bd3d in internal_fallocate (fd=-1177453080,
offset=4294967295, len=121) at ../sysdeps/posix/posix_fallocate.c:88
88      ../sysdeps/posix/posix_fallocate.c: No such file or directory.


I think you have some problem with your gdb/libthread or something.  It
showed only one thread.

Thread 1 (process 16629):
#0  0x00007f95b5d4bd3d in internal_fallocate (fd=-1177453080,
offset=4294967295, len=121) at ../sysdeps/posix/posix_fallocate.c:88
#1  0x00007f95bc0e4530 in ?? ()
#2  0x00007f95bc0e4c40 in ?? ()
#3  0x00007f95bc0e4bd0 in ?? ()
#4  0x00007f95bc0e4b60 in ?? ()
#5  0x00007f95bc0e44e0 in ?? ()
#6  0x0000000000000000 in ?? ()
root cn12:~#


This is not helpful at all.  What do you think I can gather from this?
Please, install debugging symbols or run libvirt built with debugging
info directly from git.

2017-07-26 15:15 GMT+03:00 Vasiliy Tolstov <v tolstov selfip ru>:

Everything above was pointless until here:

Thread 6 (Thread 0x7fe2cdfd5700 (LWP 18670)):
#0  0x00007fe2d491604f in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fe2d81a6bc6 in virCondWait () from /usr/lib/libvirt.so.0

We are waiting...

#2  0x00007fe2b5973d5b in qemuMonitorSend () from

for a reply from qemu monitor...

/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#3  0x00007fe2b5987ab5 in ?? () from
/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#4  0x00007fe2b5989ff1 in qemuMonitorJSONGetMemoryStats () from

after asked about memory statistics...

/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#5  0x00007fe2b599adb7 in ?? () from
/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#6  0x00007fe2b599af7a in ?? () from
/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#7  0x00007fe2b599b54d in ?? () from
/usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
#8  0x00007fe2d826e0d5 in virConnectGetAllDomainStats () from

using virConnectGetAllDomainStats().

That's the absolute maximum I can gather from this one.

The rest was pointless as well.

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