On Thu, Jun 14, 2012 at 11:50:40AM +0200, Sasha Levin 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). * Can you please post disassembly of the whole function? It seems like rsv->regions[] was corrupt. I want to verify other registers too. * Can you please try the following patch? https://lkml.org/lkml/2012/6/15/510 Thanks. -- tejun -- 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=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>