Hello The 0.9.1 release segfaults on certain benchmarks under linux-user emulation (x86 on x86).
Specifically "facerec" from the SPEC2000 benchmarks, and over half of the SPEC2006 benchmarks. I tracked this down to a problem in the mmap() code in linux-user. I've attached a patch that reverts behavior back to that from 0.9.0, which makes the benchmarks all run for me. The problem is that after a large number of mmap() calls, the mmap_find_vma() fuction sometimes completely destroys the memory map table. I can produce debug info on this if needed. What the patch does is make the code ignore the results of mmap_find_vma(). I'm not familiar enough with the qemu mmap() code to fix this properly... Thanks Vince --- ./qemu-0.9.1-stock/linux-user/mmap.c 2008-01-06 14:38:42.000000000 -0500 +++ ./qemu-0.9.1/linux-user/mmap.c 2008-01-17 13:27:11.000000000 -0500 @@ -250,8 +250,8 @@ /* Note: we prefer to control the mapping address. It is especially important if qemu_host_page_size > qemu_real_host_page_size */ - p = mmap(g2h(mmap_start), - host_len, prot, flags | MAP_FIXED, fd, host_offset); + p = mmap(real_start ? g2h(real_start) : NULL, + host_len, prot, flags, fd, host_offset); if (p == MAP_FAILED) return -1; /* update start so that it points to the file position at 'offset' */