[Qemu-devel] COLO failover hang

[wangguang]

 am testing QEMU COLO feature described here [QEMU
Wiki](http://wiki.qemu-project.org/Features/COLO). 

When the Primary Node panic,the Secondary Node qemu hang. 
hang at recvmsg in qio_channel_socket_readv. 
And  I run  { 'execute': 'nbd-server-stop' } and { "execute":
"x-colo-lost-heartbeat" } in Secondary VM's 
monitor,the  Secondary Node qemu still hang at recvmsg . 

I found that the colo in qemu is not complete yet.
Do the colo have any plan for development?
Has anyone ever run it successfully? Any help is appreciated! 



centos7.2+qemu2.7.50 
(gdb) bt 
#0  0x00007f3e00cc86ad in recvmsg () from /lib64/libpthread.so.0 
#1  0x00007f3e0332b738 in qio_channel_socket_readv (ioc=<optimized out>,
iov=<optimized out>, niov=<optimized out>, fds=0x0, nfds=0x0, errp=0x0) at
io/channel-socket.c:497 
#2  0x00007f3e03329472 in qio_channel_read (address@hidden,
address@hidden "", address@hidden,
address@hidden) at io/channel.c:97 
#3  0x00007f3e032750e0 in channel_get_buffer (opaque=<optimized out>,
buf=0x7f3e05910f38 "", pos=<optimized out>, size=32768) at
migration/qemu-file-channel.c:78 
#4  0x00007f3e0327412c in qemu_fill_buffer (f=0x7f3e05910f00) at
migration/qemu-file.c:257 
#5  0x00007f3e03274a41 in qemu_peek_byte (address@hidden,
address@hidden) at migration/qemu-file.c:510 
#6  0x00007f3e03274aab in qemu_get_byte (address@hidden) at
migration/qemu-file.c:523 
#7  0x00007f3e03274cb2 in qemu_get_be32 (address@hidden) at
migration/qemu-file.c:603 
#8  0x00007f3e03271735 in colo_receive_message (f=0x7f3e05910f00,
address@hidden) at migration/colo.c:215 
#9  0x00007f3e0327250d in colo_wait_handle_message (errp=0x7f3d62bfaa48,
checkpoint_request=<synthetic pointer>, f=<optimized out>) at
migration/colo.c:546 
#10 colo_process_incoming_thread (opaque=0x7f3e067245e0) at
migration/colo.c:649 
#11 0x00007f3e00cc1df3 in start_thread () from /lib64/libpthread.so.0 
#12 0x00007f3dfc9c03ed in clone () from /lib64/libc.so.6  





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