From: Gerd Hoffmann <kraxel@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 0/3] another round of qemu-char fixes
Date: Thu, 18 Apr 2013 08:14:40 +0200 [thread overview]
Message-ID: <516F8F50.3040301@redhat.com> (raw)
In-Reply-To: <516E76A5.7020406@redhat.com>
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
next prev parent reply other threads:[~2013-04-18 6:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-16 11:10 [Qemu-devel] [PATCH 0/3] another round of qemu-char fixes Paolo Bonzini
2013-04-16 11:10 ` [Qemu-devel] [PATCH 1/3] qemu-char: use consistent idiom for removing sources Paolo Bonzini
2013-04-16 11:10 ` [Qemu-devel] [PATCH 2/3] qemu-char: simplify pty polling Paolo Bonzini
2013-04-16 11:10 ` [Qemu-devel] [PATCH 3/3] qemu-char: correct return value from chr_read functions Paolo Bonzini
2013-04-16 11:22 ` [Qemu-devel] [PATCH 0/3] another round of qemu-char fixes Gerd Hoffmann
2013-04-17 7:06 ` Gerd Hoffmann
2013-04-17 9:28 ` Paolo Bonzini
2013-04-17 10:17 ` Paolo Bonzini
2013-04-18 6:14 ` Gerd Hoffmann [this message]
2013-04-18 12:38 ` Paolo Bonzini
2013-04-18 12:54 ` Gerd Hoffmann
2013-04-18 13:11 ` Paolo Bonzini
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