Re: [Xen-devel] Xen 4.2.1 live migration with qemu device model

[Alex Bligh <alex@xxxxxxxxxxx>]

This particular segv seems to be because in
 libxl__domain_suspend_common_switch_qemu_logdirty
in libxl_dom.c the variables 'got', and 'got_ret' do not appear to be 
initialised
to NULL (got certainly should be, got_ret should be if there is any possibility
of libxl__xs_read_checked not writing to got_ret which it doesn't seem to be).
Code inspection suggests this issue is still there in 4.2.1, hence my wondering
whether other stuff needs bringing in from unstable.


--On 11 December 2012 11:45:42 +0000 Alex Bligh <alex@xxxxxxxxxxx> wrote:

> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fffeffff700 (LWP 5995)]
> 0x00007ffff5a0862a in ?? () from /lib/x86_64-linux-gnu/libc.so.6
> (gdb) bt
> # 0  0x00007ffff5a0862a in ?? () from /lib/x86_64-linux-gnu/libc.so.6
> # 1  0x00007ffff6d4e970 in libxl__domain_suspend_common_switch_qemu_logdirty 
> (domid=<optimized out>, enable=<optimized out>, user=0x7ffff00024e8) at 
> libxl_dom.c:728
> # 2  0x00007ffff6d5c1ae in libxl__srm_callout_received_save (msg=0x7fffefffe41a " 
> error", len=<optimized out>, user=0x7ffff00024e8) at _libxl_save_msgs_callout.c:162
> # 3  0x00007ffff6d5b736 in helper_stdout_readable (egc=0x7fffefffe5a0, ev=0x7ffff0002560, 
> fd=38, events=<optimized out>, revents=<optimized out>) at 
> libxl_save_callout.c:283
> # 4  0x00007ffff6d601f1 in afterpoll_internal (egc=0x7fffefffe5a0, 
> poller=0x7ffff00028c0, nfds=4, fds=0x7ffff00048b0, now=...) at libxl_event.c:948
> # 5  0x00007ffff6d604db in eventloop_iteration (egc=0x7fffefffe5a0, 
> poller=0x7ffff00028c0) at libxl_event.c:1368
> # 6  0x00007ffff6d616b3 in libxl__ao_inprogress (ao=0x7ffff0001d40, file=<optimized out>, 
> line=<optimized out>, func=<optimized out>) at libxl_event.c:1614
> # 7  0x00007ffff6d3ab75 in libxl_domain_suspend (ctx=<optimized out>, domid=1, fd=10, 
> flags=<optimized out>, ao_how=<optimized out>) at libxl.c:796
> # 8  0x000000000043677e in migrate_domain_send (ctx=0x7ffff0008860, domid=1, 
> fd=10) at hypervisor/xen_libxl.c:587
> # 9  0x000000000043698a in live_migrate_send (hyperconn=0x7ffff0001c70, 
> server=0x7ffff0001cb0, node_ip=0x7ffff00041e0 "10.157.128.20", fd=10) at 
> hypervisor/xen_libxl.c:647
> # 10 0x0000000000422a70 in migrate_server_action (request=0x7ffff0002980) at 
> action/node_action.c:1287
> # 11 0x00000000004240c1 in runAction (socket_fd=8) at action/handleaction.c:138
> # 12 0x00000000004179bd in runcomm (socket=0x8) at xvpagent.c:253
> # 13 0x0000000000427502 in trackedthread_run (arg=0x66df20) at util/util.c:179
> # 14 0x00007ffff5c9ce9a in start_thread () from 
> /lib/x86_64-linux-gnu/libpthread.so.0
> # 15 0x00007ffff59ca4bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
> # 16 0x0000000000000000 in ?? ()


--
Alex Bligh

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