On Thu, Jun 14, 2012 at 2:50 AM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote: > On Thu, 2012-06-14 at 12:20 +0900, Tejun Heo wrote: >> On Wed, Jun 13, 2012 at 11:38:55PM +0200, Sasha Levin wrote: >> > Hi all, >> > >> > I'm seeing the following when booting a KVM guest with 65gb of RAM, on latest linux-next. >> > >> > Note that it happens with numa=off. >> > >> > [ 0.000000] BUG: unable to handle kernel paging request at ffff88102febd948 >> > [ 0.000000] IP: [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155 >> >> Can you map it back to the source line please? > > mm/memblock.c:583 > > phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0; > 97: 85 d2 test %edx,%edx > 99: 74 08 je a3 <__next_free_mem_range+0xa3> > 9b: 49 8b 48 f0 mov -0x10(%r8),%rcx > 9f: 49 03 48 e8 add -0x18(%r8),%rcx > > It's the deref on 9b (r8=ffff88102febd958). that reserved.region is allocated by memblock. can you boot with "memblock=debug debug ignore_loglevel" and post whole boot log? Thanks Yinghai -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href