X suddenly died, and was restarted. I found this in dmesg:
kernel BUG at mm/page_walk.c:430!
invalid operand: 0000
CPU: 0
EIP: 0060:[<c013beeb>] Not tainted
EFLAGS: 00013246
EIP is at make_pages_present+0x77/0xbc
eax: d0efa344 ebx: 6b6b6b6b ecx: 000000a0 edx: c1604954
esi: 6b6b6b6b edi: 00009000 ebp: d0efa344 esp: de555ef8
ds: 0068 es: 0068 ss: 0068
Process XFree86 (pid: 246, threadinfo=de554000 task=dfc00d80)
Stack: 00000000 de9c35cc 00000001 d0efa344 6b6b6b6b d0efa344 de555f00
dfc00d80
c1604954 00009000 c013be64 00000000 c0136d78 6b6b6b6b 6b6b6b6b
d0efa344
de554000 000a0000 00009000 d0efa344 00000000 d0efa344 c1604954
d0efa344
Call Trace:
[<c013be64>] gup_mk_present+0x0/0x10
[<c0136d78>] move_vma+0x3d4/0x404
[<c01370c8>] do_mremap+0x320/0x34c
[<c0137142>] sys_mremap+0x4e/0x6f
[<c0108973>] syscall_call+0x7/0xb
Code: 0f 0b ae 01 af 48 2d c0 3b 70 08 76 08 0f 0b af 01 af 48 2d
This is a UP kernel with preempt, compiled for pentium 4.
Helge Hafting