On Tue, Mar 28, 2017 at 01:48:06PM +0300, Kirill A. Shutemov wrote:
> Simple extension to support one more page table level.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> ---
> arch/x86/mm/dump_pagetables.c | 59 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 45 insertions(+), 14 deletions(-)
Hmm, so without this I get the splat below.
Can we do something about this bisection breakage? I mean, this is the
second explosion caused by 5level paging I trigger. Maybe we should
merge the whole thing into a single big patch when everything is applied
and tested, more or less, so that bisection is fine.
Or someone might have a better idea...
[ 2.801262] BUG: unable to handle kernel paging request at ffffc753f000f000
[ 2.803013] IP: ptdump_walk_pgd_level_core+0x236/0x3a0
[ 2.804472] PGD 0
[ 2.804473] P4D 0
[ 2.805231]
[ 2.805231] Oops: 0000 [#1] PREEMPT SMP
[ 2.805231] Modules linked in:
[ 2.805231] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc4+ #1
[ 2.805231] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 2.805231] task: ffff88007c1c8040 task.stack: ffffc90000008000
[ 2.805231] RIP: 0010:ptdump_walk_pgd_level_core+0x236/0x3a0
[ 2.805231] RSP: 0018:ffffc9000000be48 EFLAGS: 00010256
[ 2.805231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 2.805231] RDX: ffff880000001000 RSI: ffff880000000000 RDI: ffffc9000000bed0
[ 2.805231] RBP: ffffc9000000bef8 R08: 0000000000000000 R09: 000000000000017f
[ 2.805231] R10: 000000000000001f R11: 0000000000000001 R12: ffffc9000000be90
[ 2.805231] R13: 0000000000000000 R14: ffffc753f000f000 R15: 00000000ffffff00
[ 2.805231] FS: 0000000000000000(0000) GS:ffff88007ed00000(0000) knlGS:0000000000000000
[ 2.805231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.805231] CR2: ffffc753f000f000 CR3: 0000000001c09000 CR4: 00000000000406e0
[ 2.805231] Call Trace:
[ 2.805231] ? 0xffffffff81000000
[ 2.805231] ptdump_walk_pgd_level_checkwx+0x17/0x20
[ 2.805231] mark_rodata_ro+0xec/0x100
[ 2.805231] ? rest_init+0x90/0x90
[ 2.805231] kernel_init+0x2a/0x100
[ 2.805231] ret_from_fork+0x2e/0x40
[ 2.805231] Code: 00 88 ff ff 48 8b 5d 88 4c 8d 34 10 48 ba 00 10 00 00 00 88 ff ff 48 01 d0 48 89 85 70 ff ff ff 48 89 d8 48 c1 f8 10 48 89 45 b0 <49> 8b 06 48 a9 9f ff ff ff 74 7c 48 89 c1 48 be ff 0f 00 00 00
[ 2.805231] RIP: ptdump_walk_pgd_level_core+0x236/0x3a0 RSP: ffffc9000000be48
[ 2.805231] CR2: ffffc753f000f000
[ 2.805231] ---[ end trace 3ec6e2c757df799d ]---
[ 2.805231] Kernel panic - not syncing: Fatal exception
[ 2.805231] Kernel Offset: disabled
[ 2.805231] ---[ end Kernel panic - not syncing: Fatal exception
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
