On 04/17/13 12:17, Paolo Bonzini wrote: > Il 17/04/2013 09:06, Gerd Hoffmann ha scritto: >>>> cheers, >>>> Gerd >> Trapped into the next issue. Added qmp monitor to the virtual machine, >> linked to unix socket. Start playing with the qom-* scrips in QMP. >> qemu hangs after the first qmp-list command (triggered by socket >> disconnect?). > > Hmm, I cannot reproduce this. > > x86_64-softmmu/qemu-system-x86_64 -qmp > unix:/home/pbonzini/qmp.sock,nowait,server -vnc :1 > > (Tried also without nowait, with SDL or -nographic, with KVM, with an > additional > "-serial mon:stdio"). > > Multiple executions of "./qom-list -s /home/pbonzini/qmp.sock /machine" work, > both with and without these three patches.
Hmm. I'm running with a bunch of monitors actually, maybe that makes the difference. qemu is started via libvirt: rincewind root ~# virsh dumpxml fedora-org-virtio <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>fedora-org-virtio</name> [ ... ] <qemu:commandline> <qemu:arg value='-readconfig'/> <qemu:arg value='/root/libvirt/fedora-mon.cfg'/> [ ... ] rincewind root ~# cat /root/libvirt/fedora-mon.cfg [chardev "hmp"] backend = "socket" path = "/root/mon/fedora" server = "on" wait = "off" [chardev "qmp"] backend = "socket" path = "/root/mon/fedora.qmp" server = "on" wait = "off" [mon] chardev = "hmp" [mon] chardev = "qmp" mode = "control" Hangs here: (gdb) thread apply all bt Thread 6 (Thread 0x7f902919b700 (LWP 27869)): #0 sem_timedwait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S:106 #1 0x00007f90385307f3 in qemu_sem_timedwait (sem=0x7f903abe0978, ms=<value optimized out>) at /home/kraxel/projects/qemu/util/qemu-thread-posix.c:237 #2 0x00007f90383e835e in worker_thread (opaque=0x7f903abe08e0) at /home/kraxel/projects/qemu/thread-pool.c:96 #3 0x00007f90366a7851 in start_thread (arg=0x7f902919b700) at pthread_create.c:301 #4 0x00007f9030bf890d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 5 (Thread 0x7f901cfc7700 (LWP 27870)): #0 __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136 #1 0x00007f90366a9388 in _L_lock_854 () from /lib64/libpthread.so.0 #2 0x00007f90366a9257 in __pthread_mutex_lock (mutex=0x7f9038d5af20) at pthread_mutex_lock.c:61 #3 0x00007f9038530c99 in qemu_mutex_lock (mutex=<value optimized out>) at /home/kraxel/projects/qemu/util/qemu-thread-posix.c:57 #4 0x00007f9038476f95 in kvm_cpu_exec (env=0x7f903fe6f680) at /home/kraxel/projects/qemu/kvm-all.c:1558 #5 0x00007f9038420b41 in qemu_kvm_cpu_thread_fn (arg=0x7f903fe6f680) at /home/kraxel/projects/qemu/cpus.c:759 #6 0x00007f90366a7851 in start_thread (arg=0x7f901cfc7700) at pthread_create.c:301 #7 0x00007f9030bf890d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 4 (Thread 0x7f9017fff700 (LWP 27871)): #0 0x00007f9030bf0a47 in ioctl () at ../sysdeps/unix/syscall-template.S:82 #1 0x00007f9038474969 in kvm_vcpu_ioctl (cpu=<value optimized out>, type=<value optimized out>) at /home/kraxel/projects/qemu/kvm-all.c:1667 #2 0x00007f9038476f8d in kvm_cpu_exec (env=0x7f903fea1090) at /home/kraxel/projects/qemu/kvm-all.c:1556 #3 0x00007f9038420b41 in qemu_kvm_cpu_thread_fn (arg=0x7f903fea1090) at /home/kraxel/projects/qemu/cpus.c:759 #4 0x00007f90366a7851 in start_thread (arg=0x7f9017fff700) at pthread_create.c:301 #5 0x00007f9030bf890d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 3 (Thread 0x7f90161ff700 (LWP 27881)): #0 0x00007f9030bef253 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f9031815eac in red_worker_main (arg=<value optimized out>) at red_worker.c:11871 #2 0x00007f90366a7851 in start_thread (arg=0x7f90161ff700) at pthread_create.c:301 #3 0x00007f9030bf890d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 2 (Thread 0x7f8f4bfff700 (LWP 27882)): #0 0x00007f9030bef253 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f9031815eac in red_worker_main (arg=<value optimized out>) at red_worker.c:11871 #2 0x00007f90366a7851 in start_thread (arg=0x7f8f4bfff700) at pthread_create.c:301 #3 0x00007f9030bf890d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 Thread 1 (Thread 0x7f9038188980 (LWP 27849)): ---Type <return> to continue, or q <return> to quit--- #0 __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136 #1 0x00007f90366a9388 in _L_lock_854 () from /lib64/libpthread.so.0 #2 0x00007f90366a9257 in __pthread_mutex_lock (mutex=0x7f903abb1538) at pthread_mutex_lock.c:61 #3 0x00007f9037903c37 in ?? () from /lib64/libglib-2.0.so.0 #4 0x00007f90383c5d96 in io_watch_poll_finalize (source=<value optimized out>) at /home/kraxel/projects/qemu/qemu-char.c:648 #5 0x00007f903790382a in ?? () from /lib64/libglib-2.0.so.0 #6 0x00007f9037903b85 in ?? () from /lib64/libglib-2.0.so.0 #7 0x00007f903790616e in g_source_remove () from /lib64/libglib-2.0.so.0 #8 0x00007f90383c6645 in tcp_chr_read (chan=<value optimized out>, cond=<value optimized out>, opaque=0x7f903abb2fd0) at /home/kraxel/projects/qemu/qemu-char.c:2523 #9 0x00007f9037903f0e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0 #10 0x00007f903839ee09 in glib_pollfds_poll (nonblocking=<value optimized out>) at /home/kraxel/projects/qemu/main-loop.c:187 #11 os_host_main_loop_wait (nonblocking=<value optimized out>) at /home/kraxel/projects/qemu/main-loop.c:232 #12 main_loop_wait (nonblocking=<value optimized out>) at /home/kraxel/projects/qemu/main-loop.c:468 #13 0x00007f90384168e5 in main_loop (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at /home/kraxel/projects/qemu/vl.c:1990 #14 main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at /home/kraxel/projects/qemu/vl.c:4379
