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2014-Oct-01 08:31 UTC

Re: [libvirt-users] [libvirt] increase number of libvirt threads by starting tansient guest doamin - is it a bug?

Hello,

sorry for my later answer.

so, after i started libvirtd (no vm´s running) and attach gdb i get the
following threads

(gdb) info thread
 Id Target Id Frame 
 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd" 0x00007f190677d7cd in
poll () at ../sysdeps/unix/syscall-template.S:81

if i restore an persistent domain, i see the following in gdb:

Detaching after fork from child process 20880.
Detaching after fork from child process 20882.
[New Thread 0x7f190893d700 (LWP 20883)]
Detaching after fork from child process 20890.
Detaching after fork from child process 20906.

(gdb) info thread
 Id Target Id Frame 
 12 Thread 0x7f190893d700 (LWP 20883) "libvirtd" 0x00007f1906e6684d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd" 0x00007f190677d7cd in
poll () at ../sysdeps/unix/syscall-template.S:81

if i now destroy this vm i get the following:


(gdb) info thread
 Id Target Id Frame 
 12 Thread 0x7f190893d700 (LWP 20883) "libvirtd" 0x00007f1906e6684d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd" 0x00007f190677d7cd in
poll () at ../sysdeps/unix/syscall-template.S:81

attaching thread Id 12 and bt:
(gdb) thread 12
[Switching to thread 12 (Thread 0x7f190893d700 (LWP 20883))]
#0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
(gdb) bt
#0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
#1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, __fd=26) at
/usr/include/bits/unistd.h:44
#2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
nonblocking=nonblocking@entry =0) at xs.c:374
#3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070,
nonblocking=nonblocking@entry =0) at xs.c:1139
#4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
#5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at
pthread_create.c:309
#6 0x00007f1906787c3d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

and then bt full:

(gdb) bt full
#0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, __fd=26) at
/usr/include/bits/unistd.h:44
No locals.
#2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
nonblocking=nonblocking@entry =0) at xs.c:374
 done = <optimized out>
#3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070,
nonblocking=nonblocking@entry =0) at xs.c:1139
 __clframe = {__cancel_routine = <optimized out>, __cancel_arg =
0x7f18d4000c40, __do_it = 1, __cancel_type = <optimized out>}
 msg = 0x7f18d4000c40
 body = 0x0
 saved_errno = 0
 ret = -1
#4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
 h = 0x7f18e8001070
 fd = <optimized out>
#5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at
pthread_create.c:309
 __res = <optimized out>
 pd = 0x7f190893d700
 now = <optimized out>
 unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139745494816512,
9092725460686644452, 1, 0, 139745494817216, 139745494816512,
-9214988784542636828, -9214975709026802460}, mask_was_saved = 0}}, priv = {pad =
{0x0, 0x0, 0x0, 0x0},
 data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
 not_first_call = <optimized out>
 pagesize_m1 = <optimized out>
 sp = <optimized out>
 freesize = <optimized out>
#6 0x00007f1906787c3d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.



now the same for a transient domain, also after start of libvirtd (no vm
running):

(gdb) info thread
 Id Target Id Frame 
 11 Thread 0x7fe5cf507700 (LWP 21097) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7fe5ced06700 (LWP 21098) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7fe5ce505700 (LWP 21099) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7fe5cdd04700 (LWP 21100) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7fe5cd503700 (LWP 21101) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7fe5ccd02700 (LWP 21102) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7fe5cc501700 (LWP 21103) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7fe5cbd00700 (LWP 21104) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7fe5cb4ff700 (LWP 21105) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7fe5cacfe700 (LWP 21106) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7fe5d8ee8840 (LWP 21096) "libvirtd" 0x00007fe5d6d367cd in
poll () at ../sysdeps/unix/syscall-template.S:81

now restore the transient domain from a statefile without define them before:

Continuing.
Detaching after fork from child process 21276.
Detaching after fork from child process 21278.
[New Thread 0x7fe5d8ef6700 (LWP 21279)]
Detaching after fork from child process 21285.
Detaching after fork from child process 21302.

(gdb) info thread
 Id Target Id Frame 
 12 Thread 0x7fe5d8ef6700 (LWP 21279) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7fe5cf507700 (LWP 21097) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7fe5ced06700 (LWP 21098) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7fe5ce505700 (LWP 21099) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7fe5cdd04700 (LWP 21100) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7fe5cd503700 (LWP 21101) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7fe5ccd02700 (LWP 21102) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7fe5cc501700 (LWP 21103) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7fe5cbd00700 (LWP 21104) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7fe5cb4ff700 (LWP 21105) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7fe5cacfe700 (LWP 21106) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7fe5d8ee8840 (LWP 21096) "libvirtd" 0x00007fe5d6d367cd in
poll () at ../sysdeps/unix/syscall-template.S:81

destroy these vm:

(gdb) info thread
 Id Target Id Frame 
 12 Thread 0x7fe5d8ef6700 (LWP 21279) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7fe5cf507700 (LWP 21097) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7fe5ced06700 (LWP 21098) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7fe5ce505700 (LWP 21099) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7fe5cdd04700 (LWP 21100) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7fe5cd503700 (LWP 21101) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7fe5ccd02700 (LWP 21102) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7fe5cc501700 (LWP 21103) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7fe5cbd00700 (LWP 21104) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7fe5cb4ff700 (LWP 21105) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7fe5cacfe700 (LWP 21106) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7fe5d8ee8840 (LWP 21096) "libvirtd" 0x00007fe5d6d367cd in
poll () at ../sysdeps/unix/syscall-template.S:81


and again restore vm:

Continuing.
Detaching after fork from child process 21347.
Detaching after fork from child process 21349.
[New Thread 0x7fe5d8dff700 (LWP 21350)]
Detaching after fork from child process 21353.
Detaching after fork from child process 21373.

(gdb) info thread
 Id Target Id Frame 
 13 Thread 0x7fe5d8dff700 (LWP 21350) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 12 Thread 0x7fe5d8ef6700 (LWP 21279) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7fe5cf507700 (LWP 21097) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7fe5ced06700 (LWP 21098) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7fe5ce505700 (LWP 21099) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7fe5cdd04700 (LWP 21100) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7fe5cd503700 (LWP 21101) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7fe5ccd02700 (LWP 21102) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7fe5cc501700 (LWP 21103) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7fe5cbd00700 (LWP 21104) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7fe5cb4ff700 (LWP 21105) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7fe5cacfe700 (LWP 21106) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7fe5d8ee8840 (LWP 21096) "libvirtd" 0x00007fe5d6d367cd in
poll () at ../sysdeps/unix/syscall-template.S:81

and again, destroy vm:

(gdb) info thread
 Id Target Id Frame 
 13 Thread 0x7fe5d8dff700 (LWP 21350) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 12 Thread 0x7fe5d8ef6700 (LWP 21279) "libvirtd" 0x00007fe5d741f84d in
read () at ../sysdeps/unix/syscall-template.S:81
 11 Thread 0x7fe5cf507700 (LWP 21097) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 10 Thread 0x7fe5ced06700 (LWP 21098) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 9 Thread 0x7fe5ce505700 (LWP 21099) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 8 Thread 0x7fe5cdd04700 (LWP 21100) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 7 Thread 0x7fe5cd503700 (LWP 21101) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 6 Thread 0x7fe5ccd02700 (LWP 21102) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 5 Thread 0x7fe5cc501700 (LWP 21103) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 4 Thread 0x7fe5cbd00700 (LWP 21104) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 3 Thread 0x7fe5cb4ff700 (LWP 21105) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
 2 Thread 0x7fe5cacfe700 (LWP 21106) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1 Thread 0x7fe5d8ee8840 (LWP 21096) "libvirtd" 0x00007fe5d6d367cd in
poll () at ../sysdeps/unix/syscall-template.S:81

attach thread 13 and bt full:

(gdb) thread 13
[Switching to thread 13 (Thread 0x7fe5d8dff700 (LWP 21350))]
#0 0x00007fe5d741f84d in read () at ../sysdeps/unix/syscall-template.S:81
81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
(gdb) bt full
#0 0x00007fe5d741f84d in read () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1 0x00007fe5c91fa5be in read (__nbytes=16, __buf=0x7fe5a4000be0, __fd=37) at
/usr/include/bits/unistd.h:44
No locals.
#2 read_all (fd=37, data=data@entry =0x7fe5a4000be0, len=len@entry =16,
nonblocking=nonblocking@entry =0) at xs.c:374
 done = <optimized out>
#3 0x00007fe5c91fa675 in read_message (h=h@entry =0x7fe5b80019b0,
nonblocking=nonblocking@entry =0) at xs.c:1139
 __clframe = {__cancel_routine = <optimized out>, __cancel_arg =
0x7fe5a4000bd0, __do_it = 1, __cancel_type = <optimized out>}
 msg = 0x7fe5a4000bd0
 body = 0x0
 saved_errno = 0
 ret = -1
#4 0x00007fe5c91fae90 in read_thread (arg=0x7fe5b80019b0) at xs.c:1211
 h = 0x7fe5b80019b0
 fd = <optimized out>
#5 0x00007fe5d7418f35 in start_thread (arg=0x7fe5d8dff700) at
pthread_create.c:309
 __res = <optimized out>
 pd = 0x7fe5d8dff700
 now = <optimized out>
 unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140625162794752,
9202584519348287509, 1, 0, 140625162795456, 140625162794752,
-9188024510920296427, -9188034420488439787}, mask_was_saved = 0}}, priv = {pad =
{0x0, 0x0, 0x0, 0x0},
 data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
 not_first_call = <optimized out>
 pagesize_m1 = <optimized out>
 sp = <optimized out>
 freesize = <optimized out>
#6 0x00007fe5d6d40c3d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

i seen nothing that give me a hint while the new threads a still open.

all the best max






 
----------------ursprüngliche Nachricht-----------------
Von: "Michal Privoznik" mprivozn@redhat.com 
An: ustermann78@web.de, libvirt-users@redhat.com 
Datum: Fri, 26 Sep 2014 15:22:01 +0200
-------------------------------------------------
 
 > [Disabling cross-post]
> 
> On 26.09.2014 12:21, ustermann78@web.de wrote:
>> Hi Michal,
>> thank you for your answer.
>> so if i understand that correctly, no matter if i shutdown or destroy
the
>> domain and no matter if it is a transient or an persistent vm, the
thread should
>> disappear, right?
>>
>> in my case they still exist, also an hour after i destroy the domain
(and don´t
>> start any new one).
>>
>> i use libvirt-1.1.35 on fedora core 20, for information.
> 
> Well, can you attach gdb and see what is the new thread doing?
> 
> Michal
> 
--

Michal Privoznik

2014-Oct-01 16:12 UTC

head link

Re: [libvirt-users] [libvirt] increase number of libvirt threads by starting tansient guest doamin - is it a bug?

On 01.10.2014 10:31, web2 wrote:>   Hello,
>
> sorry for my later answer.
>
> so, after i started libvirtd (no vm´s running) and attach gdb i get the
following threads
>
> (gdb) info thread
>   Id Target Id Frame
>   11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in poll () at ../sysdeps/unix/syscall-template.S:81
>
> if i restore an persistent domain, i see the following in gdb:
>
> Detaching after fork from child process 20880.
> Detaching after fork from child process 20882.
> [New Thread 0x7f190893d700 (LWP 20883)]
> Detaching after fork from child process 20890.
> Detaching after fork from child process 20906.
>
> (gdb) info thread
>   Id Target Id Frame
>   12 Thread 0x7f190893d700 (LWP 20883) "libvirtd"
0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
>   11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in poll () at ../sysdeps/unix/syscall-template.S:81
>
> if i now destroy this vm i get the following:
>
>
> (gdb) info thread
>   Id Target Id Frame
>   12 Thread 0x7f190893d700 (LWP 20883) "libvirtd"
0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
>   11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in poll () at ../sysdeps/unix/syscall-template.S:81
>
> attaching thread Id 12 and bt:
> (gdb) thread 12
> [Switching to thread 12 (Thread 0x7f190893d700 (LWP 20883))]
> #0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
> 81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
> (gdb) bt
> #0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
> #1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, __fd=26)
at /usr/include/bits/unistd.h:44
> #2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
nonblocking=nonblocking@entry =0) at xs.c:374
> #3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070,
nonblocking=nonblocking@entry =0) at xs.c:1139
> #4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
> #5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at
pthread_create.c:309
> #6 0x00007f1906787c3d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>
> and then bt full:
>
> (gdb) bt full
> #0 0x00007f1906e6684d in read () at ../sysdeps/unix/syscall-template.S:81
> No locals.
> #1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, __fd=26)
at /usr/include/bits/unistd.h:44
> No locals.
> #2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
nonblocking=nonblocking@entry =0) at xs.c:374
>   done = <optimized out>
> #3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070,
nonblocking=nonblocking@entry =0) at xs.c:1139
>   __clframe = {__cancel_routine = <optimized out>, __cancel_arg =
0x7f18d4000c40, __do_it = 1, __cancel_type = <optimized out>}
>   msg = 0x7f18d4000c40
>   body = 0x0
>   saved_errno = 0
>   ret = -1
> #4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
>   h = 0x7f18e8001070
>   fd = <optimized out>
This stack doesn't come from libvirt. I suspect it comes from a library 
that libvirtd is linked with. Maybe libxl? What's the connection uri 
you're using?
> #5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at
pthread_create.c:309
>   __res = <optimized out>
>   pd = 0x7f190893d700
>   now = <optimized out>
>   unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139745494816512,
9092725460686644452, 1, 0, 139745494817216, 139745494816512,
-9214988784542636828, -9214975709026802460}, mask_was_saved = 0}}, priv = {pad =
{0x0, 0x0, 0x0, 0x0},
>   data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>   not_first_call = <optimized out>
>   pagesize_m1 = <optimized out>
>   sp = <optimized out>
>   freesize = <optimized out>
> #6 0x00007f1906787c3d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> No locals.

Michal

web2

2014-Oct-01 16:27 UTC

head link

Re: [libvirt-users] [libvirt] increase number of libvirt threads by starting tansient guest doamin - is it a bug?

Hi
 
----------------ursprüngliche Nachricht-----------------
Von: "Michal Privoznik" mprivozn@redhat.com 
An: "web2" ustermann78@web.de , "libvirt-users redhat.com" 
, "libvirt-list redhat.com" 
Datum: Wed, 01 Oct 2014 18:12:45 +0200
-------------------------------------------------
 
 > On 01.10.2014 10:31, web2 wrote:
>> Hello,
>>
>> sorry for my later answer.
>>
>> so, after i started libvirtd (no vm´s running) and attach gdb i get the
>> following threads
>>
>> (gdb) info thread
>> Id Target Id Frame
>> 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in
>> poll () at ../sysdeps/unix/syscall-template.S:81
>>
>> if i restore an persistent domain, i see the following in gdb:
>>
>> Detaching after fork from child process 20880.
>> Detaching after fork from child process 20882.
>> [New Thread 0x7f190893d700 (LWP 20883)]
>> Detaching after fork from child process 20890.
>> Detaching after fork from child process 20906.
>>
>> (gdb) info thread
>> Id Target Id Frame
>> 12 Thread 0x7f190893d700 (LWP 20883) "libvirtd"
0x00007f1906e6684d in
>> read () at ../sysdeps/unix/syscall-template.S:81
>> 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in
>> poll () at ../sysdeps/unix/syscall-template.S:81
>>
>> if i now destroy this vm i get the following:
>>
>>
>> (gdb) info thread
>> Id Target Id Frame
>> 12 Thread 0x7f190893d700 (LWP 20883) "libvirtd"
0x00007f1906e6684d in
>> read () at ../sysdeps/unix/syscall-template.S:81
>> 11 Thread 0x7f18fef4e700 (LWP 20695) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 10 Thread 0x7f18fe74d700 (LWP 20696) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 9 Thread 0x7f18fdf4c700 (LWP 20697) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 8 Thread 0x7f18fd74b700 (LWP 20698) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 7 Thread 0x7f18fcf4a700 (LWP 20699) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 6 Thread 0x7f18fc749700 (LWP 20700) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 5 Thread 0x7f18fbf48700 (LWP 20701) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 4 Thread 0x7f18fb747700 (LWP 20702) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 3 Thread 0x7f18faf46700 (LWP 20703) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> 2 Thread 0x7f18fa745700 (LWP 20704) "libvirtd" 
>> pthread_cond_wait@@GLIBC_2.3.2 () at 
>> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>> * 1 Thread 0x7f190892f840 (LWP 20694) "libvirtd"
0x00007f190677d7cd in
>> poll () at ../sysdeps/unix/syscall-template.S:81
>>
>> attaching thread Id 12 and bt:
>> (gdb) thread 12
>> [Switching to thread 12 (Thread 0x7f190893d700 (LWP 20883))]
>> #0 0x00007f1906e6684d in read () at 
>> ../sysdeps/unix/syscall-template.S:81
>> 81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
>> (gdb) bt
>> #0 0x00007f1906e6684d in read () at 
>> ../sysdeps/unix/syscall-template.S:81
>> #1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, 
>> __fd=26) at /usr/include/bits/unistd.h:44
>> #2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
>> nonblocking=nonblocking@entry =0) at xs.c:374
>> #3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070, 
>> nonblocking=nonblocking@entry =0) at xs.c:1139
>> #4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
>> #5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at 
>> pthread_create.c:309
>> #6 0x00007f1906787c3d in clone () at 
>> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>>
>> and then bt full:
>>
>> (gdb) bt full
>> #0 0x00007f1906e6684d in read () at 
>> ../sysdeps/unix/syscall-template.S:81
>> No locals.
>> #1 0x00007f18f8c415be in read (__nbytes=16, __buf=0x7f18d4000c50, 
>> __fd=26) at /usr/include/bits/unistd.h:44
>> No locals.
>> #2 read_all (fd=26, data=data@entry =0x7f18d4000c50, len=len@entry =16,
>> nonblocking=nonblocking@entry =0) at xs.c:374
>> done = <optimized out>
>> #3 0x00007f18f8c41675 in read_message (h=h@entry =0x7f18e8001070, 
>> nonblocking=nonblocking@entry =0) at xs.c:1139
>> __clframe = {__cancel_routine = <optimized out>, __cancel_arg = 
>> 0x7f18d4000c40, __do_it = 1, __cancel_type = <optimized out>}
>> msg = 0x7f18d4000c40
>> body = 0x0
>> saved_errno = 0
>> ret = -1
>> #4 0x00007f18f8c41e90 in read_thread (arg=0x7f18e8001070) at xs.c:1211
>> h = 0x7f18e8001070
>> fd = <optimized out>
> 
> This stack doesn't come from libvirt. I suspect it comes from a library
> that libvirtd is linked with. Maybe libxl? What's the connection uri 
> you're using?
i use xen:///. as i said early, i do tests with xen xm´s. xend is disabled, so i
use the libxl.

all the best
max
> 
>> #5 0x00007f1906e5ff35 in start_thread (arg=0x7f190893d700) at 
>> pthread_create.c:309
>> __res = <optimized out>
>> pd = 0x7f190893d700
>> now = <optimized out>
>> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139745494816512, 
>> 9092725460686644452, 1, 0, 139745494817216, 139745494816512, 
>> -9214988784542636828, -9214975709026802460}, mask_was_saved = 0}}, priv
>> = {pad = {0x0, 0x0, 0x0, 0x0},
>> data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>> not_first_call = <optimized out>
>> pagesize_m1 = <optimized out>
>> sp = <optimized out>
>> freesize = <optimized out>
>> #6 0x00007f1906787c3d in clone () at 
>> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>> No locals.
> 
> 
> Michal
> 
--

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