[Qemu-devel] Crash when using -daemonize

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

Since an upgrade to Fedora 21, I get crashes with QEMU when using 
-daemonize. I noticed this since libvirt could not QMP probe QEMU.

This is the command line used:

x86_64-softmmu/qemu-system-x86_64 -S -no-user-config -nodefaults 
-nographic -M none -pidfile /tmp/foo -daemonize

Here's the backtrace from the coredump:

#0  0x00007fe653d5c8d7 in __GI_raise (sig=sig@entry=6)
     at ../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007fe653d5e53a in __GI_abort () at abort.c:89
#2  0x00007fe658c4cb80 in error_exit (err=<optimized out>,
     msg=msg@entry=0x7fe658f58580 <__func__.6036> "qemu_mutex_unlock")
     at util/qemu-thread-posix.c:48
#3  0x00007fe658edcab0 in qemu_mutex_unlock (
     mutex=mutex@entry=0x7fe6593a01c0 <qemu_global_mutex>)
     at util/qemu-thread-posix.c:93
#4  0x00007fe658c7a96c in qemu_mutex_unlock_iothread ()
     at /root/qemu/qemu-git.pt/cpus.c:1137
#5  0x00007fe658e7695f in os_host_main_loop_wait (timeout=-1)
     at main-loop.c:234
#6  main_loop_wait (nonblocking=<optimized out>) at main-loop.c:494
#7  0x00007fe658c4e82e in main_loop () at vl.c:1795
#8  main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
     at vl.c:4354

I am using today's tip of the QEMU git tree, but I don't think that's 
the actual problem.

Anyone have an idea? I reinstalled glibc, but that doesn't seem to solve 
what looks like a mutex problem.

    Stefan