[Qemu-devel] qemu 2.2 stuck on condition mutex locks on all threads

From: Neil McGill <nmcgill@cisco.com>
To: qemu-devel@nongnu.org
Cc: "Rich Wellum (rwellum)" <rwellum@cisco.com>
Subject: [Qemu-devel] qemu 2.2 stuck on condition mutex locks on all threads
Date: Mon, 07 Dec 2015 19:44:24 -0500	[thread overview]
Message-ID: <566627E8.3000101@cisco.com> (raw)

Has anyone seen anything like this ? all 4 qemu threads are stuck on a
pthread condition

QEMU emulator version 2.2.0 (Debian 1:2.2+dfsg-5expubuntu9.3~cloud0), Copyright (c) 2003-2008 Fabrice Bellard

I'll try and get the qemu source built on this machine to debug and get
some useful symbols out of gdb, but just wondering if there is a known
issue like this on:

Linux virl 3.19.0-33-generic #38~14.04.1-Ubuntu SMP Fri Nov 6 18:17:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

tx

neil

(gdb) where
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f7a17524657 in _L_lock_909 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007f7a17524480 in __GI___pthread_mutex_lock (mutex=0x7f7a2150f9a0) at ../nptl/pthread_mutex_lock.c:79
#3  0x00007f7a21036909 in ?? ()
#4  0x00007f7a20fc1fdb in ?? ()
#5  0x00007f7a20d153fe in ?? ()
#6  0x00007f7a17176ec5 in __libc_start_main (main=0x7f7a20d13eb0, argc=94, argv=0x7ffcb0b0b948, init=<optimized out>,
     fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcb0b0b938) at libc-start.c:287
#7  0x00007f7a20d1b96c in ?? ()

(gdb) thread 2
[Switching to thread 2 (Thread 0x7f793e3ff700 (LWP 65315))]
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
185	../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: No such file or directory.
(gdb) where
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7a21036b29 in ?? ()
#2  0x00007f7a20fb10c3 in ?? ()
#3  0x00007f7a20fb14c0 in ?? ()
#4  0x00007f7a17522182 in start_thread (arg=0x7f793e3ff700) at pthread_create.c:312
#5  0x00007f7a1724f47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

(gdb) thread 3
[Switching to thread 3 (Thread 0x7f7a0cbf8700 (LWP 65311))]
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
135	../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: No such file or directory.
(gdb) where
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f7a17524657 in _L_lock_909 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007f7a17524480 in __GI___pthread_mutex_lock (mutex=0x7f7a2150f9a0) at ../nptl/pthread_mutex_lock.c:79
#3  0x00007f7a21036909 in ?? ()
#4  0x00007f7a20d57d3c in ?? ()
#5  0x00007f7a20d42db2 in ?? ()
#6  0x00007f7a17522182 in start_thread (arg=0x7f7a0cbf8700) at pthread_create.c:312
#7  0x00007f7a1724f47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

(gdb) thread 4
[Switching to thread 4 (Thread 0x7f7a0d3f9700 (LWP 65310))]
#0  0x00007f7a172421ef in __GI_ppoll (fds=0x7f7a234db150, nfds=1, timeout=<optimized out>, sigmask=0x0)
     at ../sysdeps/unix/sysv/linux/ppoll.c:56
56	../sysdeps/unix/sysv/linux/ppoll.c: No such file or directory.
(gdb) where
#0  0x00007f7a172421ef in __GI_ppoll (fds=0x7f7a234db150, nfds=1, timeout=<optimized out>, sigmask=0x0)
     at ../sysdeps/unix/sysv/linux/ppoll.c:56
#1  0x00007f7a20fc2b2b in ?? ()
#2  0x00007f7a20fc3d04 in ?? ()
#3  0x00007f7a20fb5e5f in ?? ()
#4  0x00007f7a20fb78f4 in ?? ()
#5  0x00007f7a20ef1732 in ?? ()
#6  0x00007f7a20d58e81 in ?? ()
#7  0x00007f7a20d5e947 in ?? ()
#8  0x00007f7a20d1f933 in ?? ()
#9  0x00007f7a20d57fa1 in ?? ()
#10 0x00007f7a20d42db2 in ?? ()
#11 0x00007f7a17522182 in start_thread (arg=0x7f7a0d3f9700) at pthread_create.c:312
#12 0x00007f7a1724f47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb)