mm: slub: gpf in deactivate_slab

[Sasha Levin]

Hi all,

While fuzzing with trinity inside a KVM tools guest running latest -next kernel I've stumbled
on the following spew:

[  241.916559] BUG: unable to handle kernel paging request at ffff880029aa5e58
[  241.917961] IP: [<ffffffff812c5fa3>] deactivate_slab+0x103/0x560
[  241.919439] PGD 88f9067 PUD 88fa067 PMD 102fd35067 PTE 8000000029aa5060
[  241.920339] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[  241.920339] Dumping ftrace buffer:
[  241.920339]    (ftrace buffer empty)
[  241.920339] Modules linked in:
[  241.920339] CPU: 17 PID: 9910 Comm: trinity-c183 Tainted: G        W    3.14.0-rc6-next-20140311-sasha-00009-g6c028cd-dirty #146
[  241.920339] task: ffff88090eb68000 ti: ffff88090eb70000 task.ti: ffff88090eb70000
[  241.920339] RIP: 0010:[<ffffffff812c5fa3>]  [<ffffffff812c5fa3>] deactivate_slab+0x103/0x560
[  241.920339] RSP: 0018:ffff88090eb71c18  EFLAGS: 00010082
[  241.920339] RAX: 0000000000000418 RBX: ffff880229ae2010 RCX: 0000000180170017
[  241.920339] RDX: 0000000000000000 RSI: ffffffff812c5f52 RDI: ffffffff812c5e29
[  241.920339] RBP: ffff88090eb71d28 R08: ffff880229ae2010 R09: 0000000000000080
[  241.920339] R10: ffff880229ae2ed0 R11: 0000000000000000 R12: ffffea0008a6b800
[  241.920339] R13: ffff88012b4da580 R14: ffff880029aa5a40 R15: ffff880229ae2010
[  241.920339] FS:  00007fb615415700(0000) GS:ffff88022ba00000(0000) knlGS:0000000000000000
[  241.920339] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  241.920339] CR2: ffff880029aa5e58 CR3: 000000090eb4a000 CR4: 00000000000006a0
[  241.920339] DR0: 0000000000005bf2 DR1: 0000000000000000 DR2: 0000000000000000
[  241.920339] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000070602
[  241.920339] Stack:
[  241.920339]  ffffffff856e37ab ffffffff84486272 0000000000000000 000000002b405600
[  241.920339]  ffff88090eb71c58 ffff88090eb70000 0000000000000011 ffff88022ba03fc0
[  241.920339]  ffff88090eb71cb8 000000000000000f ffff88022b405600 ffff880029aa5a40
[  241.920339] Call Trace:
[  241.920339]  [<ffffffff84486272>] ? preempt_count_sub+0xe2/0x120
[  241.920339]  [<ffffffff8130f151>] ? alloc_inode+0x41/0xa0
[  241.954886]  [<ffffffff8130f151>] ? alloc_inode+0x41/0xa0
[  241.954886]  [<ffffffff8130f151>] ? alloc_inode+0x41/0xa0
[  241.954886]  [<ffffffff812c36eb>] ? set_track+0xab/0x100
[  241.954886]  [<ffffffff812c731f>] __slab_alloc+0x42f/0x4d0
[  241.954886]  [<ffffffff81073e6d>] ? sched_clock+0x1d/0x30
[  241.954886]  [<ffffffff8130f151>] ? alloc_inode+0x41/0xa0
[  241.961624]  [<ffffffff812c870f>] kmem_cache_alloc+0x12f/0x2e0
[  241.961624]  [<ffffffff8130f151>] ? alloc_inode+0x41/0xa0
[  241.961624]  [<ffffffff8130f151>] alloc_inode+0x41/0xa0
[  241.961624]  [<ffffffff8130f1cb>] new_inode_pseudo+0x1b/0x70
[  241.961624]  [<ffffffff812f985c>] get_pipe_inode+0x1c/0xf0
[  241.961624]  [<ffffffff812f995c>] create_pipe_files+0x2c/0x170
[  241.961624]  [<ffffffff812f9ae1>] __do_pipe_flags+0x41/0xf0
[  241.961624]  [<ffffffff812f9bbb>] SyS_pipe2+0x2b/0xb0
[  241.961624]  [<ffffffff8448b3b1>] ? tracesys+0x7e/0xe2
[  241.961624]  [<ffffffff8448b410>] tracesys+0xdd/0xe2
[  241.972975] Code: 4d 85 f6 75 8b eb 45 90 4d 85 f6 75 13 49 8b 5c 24 10 45 31 ff 0f 1f 00 eb 32 66 0f 1f 44 00 00 4c 89 b5 48 ff ff ff 49 63 45 20 <49> 8b 0c 06 48 85 c9 74 10 4d 89 f7 49 8b 54 24 10 49 89 ce e9
[  241.972975] RIP  [<ffffffff812c5fa3>] deactivate_slab+0x103/0x560
[  241.972975]  RSP <ffff88090eb71c18>
[  241.972975] CR2: ffff880029aa5e58


Thanks,
Sasha
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