Crashes in 3.14.13+ related to anon_vma_clone.

[Ben Greear]

A few of our systems are repeatedly crashing when upgraded from
the 3.14.6+ to 3.14.13+ kernels.  Both kernels have a fair bit
of our out-of-tree patches, so could be our fault.

But, in case this is a known problem...has anyone seen crashes like
this below?

Test case is using some ath9k APs and stations, but not certain
that has much to do with the problem.

BUG: unable to handle kernel paging request at 0000003f9840b000
IP: [<ffffffff81169ae8>] anon_vma_clone+0x88/0xf5
PGD be580067 PUD bab85067 PMD babd5067 PTE 80000000bebbd065
Oops: 0003 [#1] PREEMPT SMP
Modules linked in: 8021q garp stp mrp llc fuse macvlan wanlink(O) pktgen ip6table_filter ip6_tables ebtable_nat ebtables coretemp hwmoo
CPU: 1 PID: 1777 Comm: btserver Tainted: G         C O 3.14.13+ #19
Hardware name: To be filled by O.E.M. To be filled by O.E.M./To be filled by O.E.M., BIOS 4.6.3 03/06/2012
task: ffff88020dcfb100 ti: ffff8800baa3e000 task.ti: ffff8800baa3e000
RIP: 0010:[<ffffffff81169ae8>]  [<ffffffff81169ae8>] anon_vma_clone+0x88/0xf5
RSP: 0018:ffff8800baa3fda0  EFLAGS: 00010246
RAX: ffff8800ba8b8380 RBX: 0000003f9840b000 RCX: 000000000142b101
RDX: 0000000000000000 RSI: ffff8800ba8b8380 RDI: ffff8800ba8b8388
RBP: ffff8800baa3fdd0 R08: 0000000000015d60 R09: 0000003f9840b000
R10: 000000000000000b R11: 0000000000016338 R12: 0000000000000000
R13: ffff8800bc609450 R14: ffff8802212db980 R15: ffff8800ba8b8380
FS:  00007f0b70511740(0000) GS:ffff88022bc80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000003f9840b000 CR3: 00000000bab8f000 CR4: 00000000000007e0
Stack:
 ffff880221ba92a0 ffff88020dcfc980 ffff8800bc609450 ffff880221ba9228
 ffff8800bc609450 ffff880221ba9228 ffff8800baa3fe08 ffffffff81169b7b
 ffff88020dcfc980 ffff880211db5f80 ffff880221ba9228 ffff8800bc609450
Call Trace:
 [<ffffffff81169b7b>] anon_vma_fork+0x26/0xec
 [<ffffffff810c0070>] copy_process.part.28+0xf98/0x16ca
 [<ffffffff810c091d>] do_fork+0xb4/0x211
 [<ffffffff810cbe9b>] ? __set_task_blocked+0x5e/0x64
 [<ffffffff815a1b9f>] ? _raw_spin_unlock_irq+0xc/0x1f
 [<ffffffff810c0ae0>] SyS_clone+0x11/0x13
 [<ffffffff815a6a59>] stub_clone+0x69/0x90
 [<ffffffff815a66fd>] ? system_call_fastpath+0x1a/0x1f
Code: 48 8b 3d 64 f1 b0 00 be d0 00 00 00 e8 9b 5e 01 00 48 85 c0 48 89 c3 74 62 45 31 e4 4d 8b 7e 08 4c 89 e7 49 8b 37 e8 fa ec ff ff
RIP  [<ffffffff81169ae8>] anon_vma_clone+0x88/0xf5
 RSP <ffff8800baa3fda0>
CR2: 0000003f9840b000

-- 
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com

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