Re: [Qemu-discuss] qemu hangs

[Nerijus Baliūnas]

2016-08-16 19:58, Peter Maydell rašė:
> This is the outer process waiting for the child process to tell
> it it's got started in os_daemonize().
>
> Does QEMU still hang if you don't pass it -daemonize ? If so,
> then it will be easier to debug that.

Yes, it still hangs:

# gdb /usr/bin/qemu-system-alpha
(gdb) r -S -no-user-config -nodefaults -nographic -M none -qmp 
unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,nowait -pidfile 
/var/lib/libvirt/qemu/capabilities.pidfile
Starting program: /usr/bin/qemu-system-alpha -S -no-user-config -nodefaults 
-nographic -M none -qmp 
unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,nowait -pidfile 
/var/lib/libvirt/qemu/capabilities.pidfile
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffc9708700 (LWP 13010)]
^C
Thread 1 "qemu-system-alp" received signal SIGINT, Interrupt.
0x00007fffda8e83f1 in __GI_ppoll (fds=0x555556cfb000, nfds=5, 
timeout=<optimized out>, address@hidden,
    address@hidden) at ../sysdeps/unix/sysv/linux/ppoll.c:50
50        result = SYSCALL_CANCEL (ppoll, fds, nfds, timeout, sigmask, _NSIG / 
8);
(gdb) bt
#0  0x00007fffda8e83f1 in __GI_ppoll (fds=0x555556cfb000, nfds=5, 
timeout=<optimized out>,
    address@hidden, address@hidden) at 
../sysdeps/unix/sysv/linux/ppoll.c:50
#1  0x00005555559455bb in qemu_poll_ns (__ss=0x0, __timeout=0x0, 
__nfds=<optimized out>, __fds=<optimized out>)
    at /usr/include/bits/poll2.h:77
#2  0x00005555559455bb in qemu_poll_ns (fds=<optimized out>, nfds=<optimized 
out>, address@hidden)
    at /usr/src/debug/qemu-2.7.0-rc2/qemu-timer.c:313
#3  0x0000555555944fba in main_loop_wait (timeout=-1) at 
/usr/src/debug/qemu-2.7.0-rc2/main-loop.c:252
#4  0x0000555555944fba in main_loop_wait (nonblocking=<optimized out>)
    at /usr/src/debug/qemu-2.7.0-rc2/main-loop.c:506
#5  0x000055555573be65 in main () at /usr/src/debug/qemu-2.7.0-rc2/vl.c:1908
#6  0x000055555573be65 in main (argc=<optimized out>, argv=<optimized out>, 
envp=<optimized out>)
    at /usr/src/debug/qemu-2.7.0-rc2/vl.c:4603