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    Subjectkernel BUG at mm/huge_memory.c:1187!
    Hi,

    I open the Transparent huge page and run the system and hit the bug
    in huge_memory.c:

    static void __split_huge_page_refcount(struct page *page)
    .
    .
    .

    /* tail_page->_mapcount cannot change */
    BUG_ON(page_mapcount(page_tail) < 0);
    .
    .

    In my understanding, the THP's tail page's mapcount is initialized to
    -1, page_mapcout(page_tail) should be 0.
    Did anyone meet the same issue?

    Thanks.

    2016-09-28 02:12:08 [810422.485203] ------------[ cut here ]------------
    2016-09-28 02:12:08 [810422.489974] kernel BUG at mm/huge_memory.c:1187!
    2016-09-28 02:12:08 [810422.494742] invalid opcode: 0000 [#1] SMP
    2016-09-28 02:12:08 [810422.499034] last sysfs file:
    /sys/devices/system/cpu/online
    2016-09-28 02:12:08 [810422.504757] CPU 31
    2016-09-28 02:12:08 [810422.506775] Modules linked in: 8021q garp
    bridge stp llc dell_rbu ipmi_devintf ipmi_si ipmi_msghandler bonding
    ipv6 microcode dca power_meter ext4 mbcache jbd2 ahci wmi dm_mirror
    dm_region_hash dm_log dm_mod
    2016-09-28 02:12:08 [810422.571439]
    2016-09-28 02:12:08 [810422.573088] Pid: 10729, comm: observer
    Tainted: G W ---------------- 2.6.32-220.23.2.el6.x86_64
    2016-09-28 02:12:08 [810422.586827] RIP: 0010:[] [] split_huge_page+0x7c4/0x800
    2016-09-28 02:12:08 [810422.595498] RSP: 0018:ffff887661c9fcd8 EFLAGS: 00010086
    2016-09-28 02:12:08 [810422.600956] RAX: 00000000ffffffff RBX:
    ffffea011b4d4000 RCX: ffffc9003018b000
    2016-09-28 02:12:08 [810422.608300] RDX: 0000000000000002 RSI:
    ffff887f4fb3b400 RDI: 0000000000000004
    2016-09-28 02:12:08 [810422.615644] RBP: ffff887661c9fd88 R08:
    000000000000007d R09: ffff880000000000
    2016-09-28 02:12:08 [810422.622983] R10: 0000000000000000 R11:
    0000000000000287 R12: ffffea011b4cdfc0
    2016-09-28 02:12:08 [810422.630325] R13: 0000000000000000 R14:
    ffffea011b4cd000 R15: 00000007f3253047
    2016-09-28 02:12:08 [810422.637664] FS: 00007f43aed23700(0000)
    GS:ffff8802723e0000(0000) knlGS:0000000000000000
    2016-09-28 02:12:08 [810422.645957] CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033
    2016-09-28 02:12:08 [810422.651855] CR2: 00002b73a80013b0 CR3:
    000000557a658000 CR4: 00000000001406e0
    2016-09-28 02:12:08 [810422.659198] DR0: 0000000000000000 DR1:
    0000000000000000 DR2: 0000000000000000
    2016-09-28 02:12:08 [810422.666543] DR3: 0000000000000000 DR6:
    00000000fffe0ff0 DR7: 0000000000000400
    2016-09-28 02:12:08 [810422.673882] Process observer (pid: 10729,
    threadinfo ffff887661c9e000, task ffff88787fb94040)
    2016-09-28 02:12:08 [810422.682611] Stack:
    2016-09-28 02:12:08 [810422.684779] 000000000000000e 0000000000000006
    ffff887f46f4e640 ffff887882be22e0
    2016-09-28 02:12:08 [810422.692213] <0> ffff887f46f4e6c8
    0000000100000000 ffff887882be22f8 0000006cd0dcb067
    2016-09-28 02:12:08 [810422.700185] <0> ffff887882be22d8
    0000000181146034 ffffea011b4cd038 ffff88000002c1c0
    2016-09-28 02:12:08 [810422.708420] Call Trace:
    2016-09-28 02:12:08 [810422.711026] [] __split_huge_page_pmd+0x81/0xc0
    2016-09-28 02:12:08 [810422.717272] [] split_huge_page_address+0x9a/0xa0
    2016-09-28 02:12:08 [810422.723686] [] __vma_adjust_trans_huge+0xd0/0xf0
    2016-09-28 02:12:08 [810422.730102] [] vma_adjust+0x4fa/0x590
    2016-09-28 02:12:08 [810422.735566] [] __split_vma+0x143/0x280
    2016-09-28 02:12:08 [810422.741115] [] do_munmap+0x25a/0x3a0
    2016-09-28 02:12:08 [810422.746489] [] sys_munmap+0x56/0x80
    2016-09-28 02:12:08 [810422.751782] [] system_call_fastpath+0x16/0x1b
    2016-09-28 02:12:08 [810422.757939] Code: b0 fc ff ff 0f 0b 90 eb fd
    49 8b 46 10 e9 d4 fc ff ff 0f 0b 0f 1f 00 eb fb 49 8b 06 a9 00 00 00
    02 0f 84 1c fa ff ff f3 90 eb ee <0f> 0b eb fe 0f 0b 66 0f 1f 44 00 00
    eb f8 0f 0b eb fe 0f 0b 0f
    2016-09-28 02:12:08 [810422.778682] RIP [] split_huge_page+0x7c4/0x800
    2016-09-28 02:12:08 [810422.784947] RSP
    2016-09-28 02:12:08 [810422.789074] ---[ end trace a7919e7f17c0a727 ]---

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