On 04/25/2013 10:01 PM, Dave Jones wrote:
On Thu, Apr 25, 2013 at 08:51:27PM -0400, Sasha Levin wrote:
> On 04/24/2013 06:46 PM, Andrew Morton wrote:
> > Guys, did this get fixed?
>
> I've stopped seeing that during fuzzing, so I guess that it got fixed somehow...
We've had reports of users hitting this in 3.8
eg:
https://bugzilla.redhat.com/show_bug.cgi?id=947985
https://bugzilla.redhat.com/show_bug.cgi?id=956730
I'm sure there are other reports of it too.
Would be good if we can figure out what fixed it (if it is actually fixed)
for backporting to stable
It's been a while (7 months?), but this one is back...
Just hit it again with today's -next:
[ 762.701278] BUG: unable to handle kernel paging request at ffff88009eae6000
[ 762.702462] IP: [<ffffffff81ae8455>] copy_page_rep+0x5/0x10
[ 762.703369] PGD 84bb067 PUD 22fa81067 PMD 22f98b067 PTE 800000009eae6060
[ 762.704411] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 762.705873] Dumping ftrace buffer:
[ 762.707606] (ftrace buffer empty)
[ 762.708311] Modules linked in:
[ 762.708762] CPU: 16 PID: 17920 Comm: trinity-c16 Tainted: G W 3.13.0-next-2
0140203-sasha-00007-gf4985e2 #23
[ 762.710135] task: ffff8801ac358000 ti: ffff880199234000 task.ti: ffff880199234000
[ 762.710135] RIP: 0010:[<ffffffff81ae8455>] [<ffffffff81ae8455>] copy_page_rep+0x5/0x
10
[ 762.710135] RSP: 0018:ffff880199235c90 EFLAGS: 00010286
[ 762.710135] RAX: 0000000080000002 RBX: 00000000056db980 RCX: 0000000000000200
[ 762.710135] RDX: ffff8801ac358000 RSI: ffff88009eae6000 RDI: ffff88015b6e6000
[ 762.710135] RBP: ffff880199235cd8 R08: 0000000000000000 R09: 0000000000000000
[ 762.710135] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000027ab980
[ 762.710135] R13: 0000000000000200 R14: 00000000000000e6 R15: ffff880000000000
[ 762.710135] FS: 00007fb0804e1700(0000) GS:ffff88003da00000(0000) knlGS:0000000000000
000
[ 762.710135] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 762.710135] CR2: ffff88009eae6000 CR3: 0000000199225000 CR4: 00000000000006e0
[ 762.710135] Stack:
[ 762.710135] ffffffff81298995 ffff8801a841ae00 ffff88003d084520 ffff880199227090
[ 762.710135] 800000009ea008e5 ffff8801a841ae00 ffffea00027a8000 ffff880199227090
[ 762.710135] ffffea00056d8000 ffff880199235d58 ffffffff812d7260 ffff880199235cf8
[ 762.710135] Call Trace:
[ 762.710135] [<ffffffff81298995>] ? copy_user_huge_page+0x1a5/0x210
[ 762.710135] [<ffffffff812d7260>] do_huge_pmd_wp_page+0x3d0/0x650
[ 762.710135] [<ffffffff811a308e>] ? put_lock_stats+0xe/0x30
[ 762.710135] [<ffffffff8129b511>] __handle_mm_fault+0x2b1/0x3d0
[ 762.710135] [<ffffffff8129b763>] handle_mm_fault+0x133/0x1c0
[ 762.710135] [<ffffffff8129bcf8>] __get_user_pages+0x438/0x630
[ 762.710135] [<ffffffff811a308e>] ? put_lock_stats+0xe/0x30
[ 762.710135] [<ffffffff8129cfc4>] __mlock_vma_pages_range+0xd4/0xe0
[ 762.710135] [<ffffffff8129d0e0>] __mm_populate+0x110/0x190
[ 762.710135] [<ffffffff8129dcd0>] SyS_mlockall+0x160/0x1b0
[ 762.710135] [<ffffffff84450650>] tracesys+0xdd/0xe2
[ 762.710135] Code: 90 90 90 90 90 90 9c fa 65 48 3b 06 75 14 65 48 3b 56 08 75 0d 65 48 89 1e 65
48 89 4e 08 9d b0 01 c3 9d 30 c0 c3 b9 00 02 00 00 <f3> 48 a5 c3 0f 1f 80 00
00 00 00 eb ee 66 66 66 90 66 66 66 90
[ 762.710135] RIP [<ffffffff81ae8455>] copy_page_rep+0x5/0x10
[ 762.710135] RSP <ffff880199235c90>
[ 762.710135] CR2: ffff88009eae6000
Thanks,
Sasha
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