search for: 0x7f800

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)

...7AUS-1.15]- 06/13/2012 [ 0.000000] e820: update [mem 0x00000000-0x0000ffff] usable ==> reserved [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable [ 0.000000] No AGP bridge found [ 0.000000] e820: last_pfn = 0x180000 max_arch_pfn = 0x400000000 [ 0.000000] e820: last_pfn = 0x7f800 max_arch_pfn = 0x400000000 [ 0.000000] initial memory mapped: [mem 0x00000000-0x02334fff] [ 0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576 [ 0.000000] init_memory_mapping: [mem 0x00000000-0x7f7fffff] [ 0.000000] [mem 0x00000000-0x7f7fffff] page 4k [ 0.000000...