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[Xen-devel] frequently ballooning results in qemu exit

We created a 64bit SLES11 SP1 guest, and then used a script to change memory 
(using mem-set command) periodically (in 1 second): set 1G, set 2G, set 1G, set 
2G, and so on. 
After a few minutes, we encountered QEMU exit due to SIGBUS error. Below is the 
call trace captured by gdb:

The call trace:
Program received signal SIGBUS, Bus error.
0x00007f94f74773d7 in memcpy () from /lib64/libc.so.6
(gdb) bt
#0  0x00007f94f74773d7 in memcpy () from /lib64/libc.so.6
#1  0x00007f94fa67016d in address_space_rw (as=<optimized out>, 
addr=2042531840, buf=0x7fffa36accf8 "", len=4, is_write=true) at 
#2  0x00007f94fa747cf0 in rw_phys_req_item (rw=<optimized out>, val=<optimized 
out>, i=<optimized out>, req=<optimized out>, addr=<optimized out>)
    at /opt/new/tools/qemu-xen-dir/xen-all.c:709
#3  write_phys_req_item (val=<optimized out>, i=<optimized out>, req=<optimized 
out>, addr=<optimized out>) at /opt/new/tools/qemu-xen-dir/xen-all.c:720
#4  cpu_ioreq_pio (req=<optimized out>) at 
#5  handle_ioreq (req=0x7f94fa464000) at 
#6  0x00007f94fa748abe in cpu_handle_ioreq (opaque=0x7f94fb39d3f0) at 
#7  0x00007f94fa5e3262 in qemu_iohandler_poll (readfds=0x7f94faeea7a0 <rfds>, 
writefds=0x7f94faeea820 <wfds>, xfds=<optimized out>, ret=<optimized out>) at 
#8  0x00007f94fa5ec51d in main_loop_wait (nonblocking=<optimized out>) at 
#9  0x00007f94fa6616dc in main_loop () at vl.c:1770
#10 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at 

It looks mapcache has something wrong because memcpy failed with the address 
from mapcache. Any ideas about this issue? Thanks!


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