From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:38825) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1USi7K-0000RU-TO for qemu-devel@nongnu.org; Thu, 18 Apr 2013 02:14:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1USi7J-0000iP-Cx for qemu-devel@nongnu.org; Thu, 18 Apr 2013 02:14:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41733) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1USi7J-0000fH-3V for qemu-devel@nongnu.org; Thu, 18 Apr 2013 02:14:45 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r3I6EgTN031320 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 18 Apr 2013 02:14:43 -0400 Message-ID: <516F8F50.3040301@redhat.com> Date: Thu, 18 Apr 2013 08:14:40 +0200 From: Gerd Hoffmann MIME-Version: 1.0 References: <1366110642-22095-1-git-send-email-pbonzini@redhat.com> <516D3483.8080804@redhat.com> <516E49E7.9040901@redhat.com> <516E76A5.7020406@redhat.com> In-Reply-To: <516E76A5.7020406@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 0/3] another round of qemu-char fixes List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: qemu-devel 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 fedora-org-virtio [ ... ] [ ... ] 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=) 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=) 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=, type=) 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=, nfds=, timeout=) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f9031815eac in red_worker_main (arg=) 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=, nfds=, timeout=) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f9031815eac in red_worker_main (arg=) 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 to continue, or q 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=) 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=, cond=, 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=) at /home/kraxel/projects/qemu/main-loop.c:187 #11 os_host_main_loop_wait (nonblocking=) at /home/kraxel/projects/qemu/main-loop.c:232 #12 main_loop_wait (nonblocking=) at /home/kraxel/projects/qemu/main-loop.c:468 #13 0x00007f90384168e5 in main_loop (argc=, argv=, envp=) at /home/kraxel/projects/qemu/vl.c:1990 #14 main (argc=, argv=, envp=) at /home/kraxel/projects/qemu/vl.c:4379