[Qemu-devel] [Bug 1472083] [NEW] Qemu 2.1.2 hang when stop command

[changlimin]

Public bug reported:

Qemu 2.1.2, Linux kernel 3.13.6, this is the stack.

#0  in ppoll () from /lib/x86_64-linux-gnu/libc.so.6
#1  in qemu_poll_ns (fds=0x7fa82a8de380, nfds=1, timeout=-1) at qemu-timer.c:314
#2  in aio_poll (ctx=0x7fa82a8b5000, blocking=true) at aio-posix.c:250
#3  in bdrv_drain_all () at block.c:1924
#4  in do_vm_stop (state=RUN_STATE_PAUSED) at /qemu-2.1.2/cpus.c:544
#5  in vm_stop (state=RUN_STATE_PAUSED) at /qemu-2.1.2/cpus.c:1227
#6  in qmp_stop (errp=0x7ffffb6dcaf8) at qmp.c:98
#7  in qmp_marshal_input_stop (mon=0x7fa82a8e0970, qdict=0x7fa830295020, 
ret=0x7ffffb6dcb48) at qmp-marshal.c:2806
#8  in qmp_call_cmd (mon=0x7fa82a8e0970, cmd=0x7fa8290558a0, 
params=0x7fa830295020)  at /qemu-2.1.2/monitor.c:5038
#9  in handle_qmp_command (parser=0x7fa82a8e0a28, tokens=0x7fa82a8d9b50) at 
/qemu-2.1.2/monitor.c:5104
#10 in json_message_process_token (lexer=0x7fa82a8e0a30, token=0x7fa830122b60, 
type=JSON_OPERATOR, x=39, y=17865) at qobject/json-streamer.c:87
#11 in json_lexer_feed_char (lexer=0x7fa82a8e0a30, ch=125 '}', flush=false) at 
qobject/json-lexer.c:303
#12 in json_lexer_feed (lexer=0x7fa82a8e0a30, buffer=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at qobject/json-lexer.c:356
#13 in json_message_parser_feed (parser=0x7fa82a8e0a28, buffer=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at qobject/json-streamer.c:111
#14 in monitor_control_read (opaque=0x7fa82a8e0970, buf=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at /qemu-2.1.2/monitor.c:5125
#15 in qemu_chr_be_write (s=0x7fa82a8c2020, buf=0x7ffffb6dcdb0 
"}\315m\373\377\177", len=1) at qemu-char.c:213
#16 in tcp_chr_read (chan=0x7fa82a8c4ba0, cond=G_IO_IN, opaque=0x7fa82a8c2020) 
at qemu-char.c:2729
#17 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 in glib_pollfds_poll () at main-loop.c:190
#19 in os_host_main_loop_wait (timeout=24000000) at main-loop.c:235
#20 in main_loop_wait (nonblocking=0) at main-loop.c:484
#21 in main_loop () at vl.c:2034
#22 in main (argc=55, argv=0x7ffffb6de338, envp=0x7ffffb6de4f8) at vl.c:4583

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1472083

Title:
  Qemu 2.1.2 hang when stop command

Status in QEMU:
  New

Bug description:
  Qemu 2.1.2, Linux kernel 3.13.6, this is the stack.

  #0  in ppoll () from /lib/x86_64-linux-gnu/libc.so.6
  #1  in qemu_poll_ns (fds=0x7fa82a8de380, nfds=1, timeout=-1) at 
qemu-timer.c:314
  #2  in aio_poll (ctx=0x7fa82a8b5000, blocking=true) at aio-posix.c:250
  #3  in bdrv_drain_all () at block.c:1924
  #4  in do_vm_stop (state=RUN_STATE_PAUSED) at /qemu-2.1.2/cpus.c:544
  #5  in vm_stop (state=RUN_STATE_PAUSED) at /qemu-2.1.2/cpus.c:1227
  #6  in qmp_stop (errp=0x7ffffb6dcaf8) at qmp.c:98
  #7  in qmp_marshal_input_stop (mon=0x7fa82a8e0970, qdict=0x7fa830295020, 
ret=0x7ffffb6dcb48) at qmp-marshal.c:2806
  #8  in qmp_call_cmd (mon=0x7fa82a8e0970, cmd=0x7fa8290558a0, 
params=0x7fa830295020)  at /qemu-2.1.2/monitor.c:5038
  #9  in handle_qmp_command (parser=0x7fa82a8e0a28, tokens=0x7fa82a8d9b50) at 
/qemu-2.1.2/monitor.c:5104
  #10 in json_message_process_token (lexer=0x7fa82a8e0a30, 
token=0x7fa830122b60, type=JSON_OPERATOR, x=39, y=17865) at 
qobject/json-streamer.c:87
  #11 in json_lexer_feed_char (lexer=0x7fa82a8e0a30, ch=125 '}', flush=false) 
at qobject/json-lexer.c:303
  #12 in json_lexer_feed (lexer=0x7fa82a8e0a30, buffer=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at qobject/json-lexer.c:356
  #13 in json_message_parser_feed (parser=0x7fa82a8e0a28, buffer=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at qobject/json-streamer.c:111
  #14 in monitor_control_read (opaque=0x7fa82a8e0970, buf=0x7ffffb6dcdb0 
"}\315m\373\377\177", size=1) at /qemu-2.1.2/monitor.c:5125
  #15 in qemu_chr_be_write (s=0x7fa82a8c2020, buf=0x7ffffb6dcdb0 
"}\315m\373\377\177", len=1) at qemu-char.c:213
  #16 in tcp_chr_read (chan=0x7fa82a8c4ba0, cond=G_IO_IN, 
opaque=0x7fa82a8c2020) at qemu-char.c:2729
  #17 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #18 in glib_pollfds_poll () at main-loop.c:190
  #19 in os_host_main_loop_wait (timeout=24000000) at main-loop.c:235
  #20 in main_loop_wait (nonblocking=0) at main-loop.c:484
  #21 in main_loop () at vl.c:2034
  #22 in main (argc=55, argv=0x7ffffb6de338, envp=0x7ffffb6de4f8) at vl.c:4583

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