Re: [Xen-users] Crashes on image file backed VMs

[Ian Campbell <ian.campbell@citrix.com>]

On Sat, 2015-12-19 at 11:18 +0000, Andre Fucs wrote:
> Ian,
> 
> Thanks for the reply. 
> 
> coredumpctl gbd PID_OF_PROCESS printed the following:

A SIGBUS in QEMU's blk_handle_requests, how exciting!

Copying xen-devel and some relevant maintainers, start of thread is
http://lists.xen.org/archives/html/xen-users/2015-12/msg00073.html
From that, this is Xen 4.5.1 on arch Linux.

Andre, could you take a look under /var/log/xen for logs relating to a
domain to which this has happened, in particular the qemu log. It would
also be useful to see the corresponding guest cfg file I expect.

Ian.

> [...]

> warning: Could not load shared library symbols for linux-vdso.so.1.
> Do you need "set solib-search-path" or "set sysroot"?
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/usr/lib/libthread_db.so.1".
> Core was generated by `/usr/lib/xen/bin/qemu-system-i386 -xen-domid 11
> -chardev                                                                
>              socket,id=libxl-cmd,pa'.
> Program terminated with signal SIGBUS, Bus error.
> #0  0x000055b276a618fd in blk_handle_requests (blkdev=0x55b277c49ab0)
>     at /home/xafucs/xen/src/xen-4.5.1/tools/qemu-
> xen/hw/block/xen_disk.c:699
> 699     rp = blkdev->rings.common.sring->req_prod;
> [Current thread is 1 (Thread 0x7f68ed0909c0 (LWP 10134))]
> (gdb) bt
> #0  0x000055b276a618fd in blk_handle_requests (blkdev=0x55b277c49ab0) at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/hw/block/xen_disk.c:699
> #1  blk_bh (opaque=0x55b277c49ab0) at /home/xafucs/xen/src/xen-
> 4.5.1/tools/qemu-xen/hw/block/xen_disk.c:738
> #2  0x000055b2769e62d3 in aio_bh_poll (ctx=ctx@entry=0x55b277c34600) at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/async.c:81
> #3  0x000055b2769e5efc in aio_poll (ctx=0x55b277c34600, blocking=blocking
> @entry=false) at /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/aio-
> posix.c:188
> #4  0x000055b2769e6103 in aio_ctx_dispatch (source=<optimized out>,
> callback=<optimized out>, user_data=<optimized out>)
>     at /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/async.c:211
> #5  0x00007f68ebf98dc7 in g_main_context_dispatch () from
> /usr/lib/libglib-2.0.so.0
> #6  0x000055b276b066b1 in glib_pollfds_poll () at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/main-loop.c:190
> #7  os_host_main_loop_wait (timeout=<optimized out>) at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/main-loop.c:235
> #8  main_loop_wait (nonblocking=<optimized out>) at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/main-loop.c:484
> #9  0x000055b276b77e09 in main_loop () at /home/xafucs/xen/src/xen-
> 4.5.1/tools/qemu-xen/vl.c:2056
> #10 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized
> out>) at /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/vl.c:4535
> (gdb) thread 1
> [Switching to thread 1 (Thread 0x7f68ed0909c0 (LWP 10134))]
> #0  0x000055b276a618fd in blk_handle_requests (blkdev=0x55b277c49ab0) at
> /home/xafucs/xen/src/xen-4.5.1/tools/qemu-xen/hw/block/xen_disk.c:699
> 699     rp = blkdev->rings.common.sring->req_prod;
> 
> 

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