On Mon, Oct 05, 2009 at 10:43:42PM +1100, Sarton O'Brien wrote:
# uvm_fault(0xffffffff80c2da00, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff805651f3 cs e030 rflags 10246 cr2 0 cpl
0 rsp ff
ffa00013ac3ad0
kernel: page fault trap, code=0
Stopped in pid 0.43 (system) at netbsd:sdioctl+0x506: movl 0(%rcx),%r8d
sdioctl() at netbsd:sdioctl+0x506
VOP_IOCTL() at netbsd:VOP_IOCTL+0x31
xbdback_do_io() at netbsd:xbdback_do_io+0xd2
workqueue_worker() at netbsd:workqueue_worker+0x81
Could you see if xbdback_xenbus.c 1.26 fixes your issue ?