kernel BUG in munlock_vma_pages_range

[Sasha Levin]

Hi all,

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

The code seems to be in munlock_vma_pages_range():

        page = follow_page_mask(vma, start, FOLL_GET | FOLL_DUMP,
                        &page_mask);

        if (page && !IS_ERR(page)) {
                if (PageTransHuge(page)) {		<<==== HERE
                        lock_page(page);


This is new code added in "mm: munlock: batch non-THP page isolation and munlock+putback
using pagevec". I've Cc'ed involved parties.

[  356.390309] kernel BUG at include/linux/page-flags.h:415!
[  356.390309] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[  356.395160] Dumping ftrace buffer:
[  356.395160]    (ftrace buffer empty)
[  356.395160] Modules linked in:
[  356.395160] CPU: 36 PID: 10919 Comm: trinity-child74 Not tainted 
3.13.0-rc2-next-20131206-sasha-00005-g8be2375-dirty #4045
[  356.395160] task: ffff880f731e0000 ti: ffff880f731e8000 task.ti: ffff880f731e8000
[  356.395160] RIP: 0010:[<ffffffff812636c9>]  [<ffffffff812636c9>] munlock_vma_pages_range+0x89/0x1b0
[  356.395160] RSP: 0018:ffff880f731e9b58  EFLAGS: 00010286
[  356.395160] RAX: 002fffff80008000 RBX: 00007f91cd801000 RCX: 0000000000000000
[  356.395160] RDX: ffffea003ded0040 RSI: 00000000000013f1 RDI: 00000000ffffffff
[  356.395160] RBP: ffff880f731e9c18 R08: 00000000e26e4584 R09: 0000000000000001
[  356.395160] R10: 0000000000000001 R11: 0000000000000000 R12: ffffea003ded0040
[  356.395160] R13: ffff880f733a8400 R14: 00007f91cdeea000 R15: ffff880f731e9be4
[  356.395160] FS:  0000000000000000(0000) GS:ffff880fdba00000(0000) knlGS:0000000000000000
[  356.395160] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  356.395160] CR2: 0000000000000000 CR3: 0000000f7314a000 CR4: 00000000000006e0
[  356.395160] Stack:
[  356.395160]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  356.395160]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  356.395160]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  356.395160] Call Trace:
[  356.395160]  [<ffffffff81264c89>] exit_mmap+0x59/0x170
[  356.395160]  [<ffffffff8129a4a0>] ? __khugepaged_exit+0xe0/0x150
[  356.395160]  [<ffffffff81292d2b>] ? kmem_cache_free+0x24b/0x310
[  356.395160]  [<ffffffff8129a4a0>] ? __khugepaged_exit+0xe0/0x150
[  356.395160]  [<ffffffff81127eec>] mmput+0x7c/0xf0
[  356.395160]  [<ffffffff8112c18d>] exit_mm+0x18d/0x1a0
[  356.395160]  [<ffffffff811c8d85>] ? acct_collect+0x175/0x1b0
[  356.395160]  [<ffffffff8112ceef>] do_exit+0x26f/0x4e0
[  356.395160]  [<ffffffff8112d209>] do_group_exit+0xa9/0xe0
[  356.395160]  [<ffffffff81311ff0>] get_signal_to_deliver+0x460/0x4b0
[  356.395160]  [<ffffffff81067c3b>] do_signal+0x4b/0x120
[  356.395160]  [<ffffffff842a4405>] ? _raw_spin_unlock+0x35/0x60
[  356.395160]  [<ffffffff81168d36>] ? vtime_account_user+0x96/0xb0
[  356.395160]  [<ffffffff8122ccbf>] ? context_tracking_user_exit+0xaf/0x160
[  356.395160]  [<ffffffff81067f9a>] do_notify_resume+0x5a/0xe0
[  356.395160]  [<ffffffff842ad0f0>] int_signal+0x12/0x17
[  356.395160] Code: 48 89 de 4c 89 ef e8 17 7f ff ff 49 89 c4 48 85 c0 0f 84 eb 00 00 00 48 3d 00 
f0 ff ff 0f 87 df 00 00 00 48 8b 00 66 85 c0 79 0f <0f> 0b 0f 1f 44 00 00 eb fe 66 0f 1f 44 00 00 49 
8b 04 24 f6 c4
[  356.395160] RIP  [<ffffffff812636c9>] munlock_vma_pages_range+0x89/0x1b0
[  356.395160]  RSP <ffff880f731e9b58>
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