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    Subject[bugfix] mm: zone_end_pfn is too small
    Booting with 32 TBytes memory hits BUG at mm/page_alloc.c:552! (output below).

    The key hint is "page 4294967296 outside zone".
    4294967296 = 0x100000000 (bit 32 is set).

    The problem is in include/linux/mmzone.h:

    530 static inline unsigned zone_end_pfn(const struct zone *zone)
    531 {
    532 return zone->zone_start_pfn + zone->spanned_pages;
    533 }

    zone_end_pfn is "unsigned" (32 bits). Changing it to
    "unsigned long" (64 bits) fixes the problem.

    zone_end_pfn() was added recently in commit 108bcc96ef7047c02cad4d229f04da38186a3f3f.
    http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/include/linux/mmzone.h?id=108bcc96ef7047c02cad4d229f04da38186a3f3f


    Output from the failure.

    No AGP bridge found
    page 4294967296 outside zone [ 4294967296 - 4327469056 ]
    ------------[ cut here ]------------
    kernel BUG at mm/page_alloc.c:552!
    invalid opcode: 0000 [#1] SMP
    Modules linked in:
    CPU 0
    Pid: 0, comm: swapper Not tainted 3.9.0-rc2.dtp+ #10
    RIP: 0010:[<ffffffff811477d2>] [<ffffffff811477d2>] free_one_page+0x382/0x430
    RSP: 0000:ffffffff81943d98 EFLAGS: 00010002
    RAX: 0000000000000001 RBX: ffffea4000000000 RCX: 000000000000b3d9
    RDX: 0000000000000000 RSI: 0000000000000086 RDI: 0000000000000046
    RBP: ffffffff81943df8 R08: 0000000000000040 R09: 0000000000000023
    R10: 00000000000034bf R11: 00000000000034bf R12: ffffea4000000000
    R13: ffff981efefd9d80 R14: 0000000000000006 R15: 0000000000000006
    FS: 0000000000000000(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: ffffc7defefff000 CR3: 000000000194e000 CR4: 00000000000406b0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process swapper (pid: 0, threadinfo ffffffff81942000, task ffffffff81955420)
    Stack:
    00000000000000ff ffffc900000100a0 ffffc900000100d0 ffffffff00000040
    0000000000000000 0000000081148809 0000000000000097 ffffea4000000000
    0000000000000006 0000000000000002 0000000101e82bc0 ffffea4000001000
    Call Trace:
    [<ffffffff81149176>] __free_pages_ok+0x96/0xb0
    [<ffffffff8114c585>] __free_pages+0x25/0x50
    [<ffffffff8164c006>] __free_pages_bootmem+0x8a/0x8c
    [<ffffffff81a9684f>] __free_memory_core+0xea/0x131
    [<ffffffff81a968e0>] free_low_memory_core_early+0x4a/0x98
    [<ffffffff81a96973>] free_all_bootmem+0x45/0x47
    [<ffffffff81a87cff>] mem_init+0x7b/0x14c
    [<ffffffff81a70051>] start_kernel+0x216/0x433
    [<ffffffff81a6fc59>] ? repair_env_string+0x5b/0x5b
    [<ffffffff81a6f5f7>] x86_64_start_reservations+0x2a/0x2c
    [<ffffffff81a6f73d>] x86_64_start_kernel+0x144/0x153
    Code: 89 f1 ba 01 00 00 00 31 f6 d3 e2 4c 89 ef e8 66 a4 01 00 e9 2c fe ff ff 0f 0b eb fe 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 eb f3 <0f> 0b eb fe 0f 0b 0f 1f 84 00 00 00 00 00 eb f6 0f 0b eb fe 49
    RIP [<ffffffff811477d2>] free_one_page+0x382/0x430
    RSP <ffffffff81943d98>
    ---[ end trace a7919e7f17c0a725 ]---
    Kernel panic - not syncing: Attempted to kill the idle task!

    Signed-off-by: Russ Anderson <rja@sgi.com>
    Reported-by: George Beshers <gbeshers@sgi.com>
    Acked-by: Hedi Berriche <hedi@sgi.com>

    ---
    include/linux/mmzone.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: linux/include/linux/mmzone.h
    ===================================================================
    --- linux.orig/include/linux/mmzone.h 2013-03-18 10:06:59.744082190 -0500
    +++ linux/include/linux/mmzone.h 2013-03-18 10:23:27.374031648 -0500
    @@ -527,7 +527,7 @@ static inline int zone_is_oom_locked(con
    return test_bit(ZONE_OOM_LOCKED, &zone->flags);
    }

    -static inline unsigned zone_end_pfn(const struct zone *zone)
    +static inline unsigned long zone_end_pfn(const struct zone *zone)
    {
    return zone->zone_start_pfn + zone->spanned_pages;
    }
    --
    Russ Anderson, OS RAS/Partitioning Project Lead
    SGI - Silicon Graphics Inc rja@sgi.com

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