On 03/09/2015 05:34 PM, Christian Borntraeger wrote:
Am 09.03.2015 um 22:03 schrieb Stefan Berger:
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.
I think it is.
Paolo has posted a quick fix in the thread of "vl: take iothread lock very
early".
Can you verify?
Yes, verified. And this solves this problem.
Stefan
