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    SubjectRe: [BUG] 2.6.23-rc3-mm1 kernel BUG at mm/page_alloc.c:2876!
    On Thu, 23 Aug 2007 01:50:10 +0530
    Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote:

    > Hi Andrew,
    >
    > I see call trace followed by the kernel bug with the 2.6.23-rc3-mm1
    > kernel and have attached the boot log and config file.
    >
    > =======================================================
    > SLUB: Genslabs=12, HWalign=128, Order=0-1, MinObjects=4, CPUs=4, Nodes=16
    > Bad page state in process 'swapper'
    > page:cf00000000015818 flags:0x0000020000000400 mapping:0000000000000000
    > mapcount:0 count:0
    > Trying to fix it up, but a reboot is needed
    > Backtrace:
    > Call Trace:
    > [c0000000005cbab0] [c000000000010344] .show_stack+0x68/0x1b4 (unreliable)
    > [c0000000005cbb60] [c0000000000a6c54] .bad_page+0x84/0x138
    > [c0000000005cbbf0] [c0000000000aa9e0] .free_hot_cold_page+0xdc/0x21c
    > [c0000000005cbc90] [c0000000000ad7ec] .put_page+0x158/0x180
    > [c0000000005cbd30] [c0000000000d4de8] .kfree+0x74/0xf0
    > [c0000000005cbdb0] [c0000000000a866c] .process_zones+0x1a8/0x1f8
    > [c0000000005cbe60] [c0000000004b5160] .setup_per_cpu_pageset+0x24/0x48
    > [c0000000005cbee0] [c0000000004978d8] .start_kernel+0x304/0x3f4
    > [c0000000005cbf90] [c0000000003bef10] .start_here_common+0x54/0x58
    > Hexdump:
    > 000: cf 00 00 00 00 01 57 d0 00 00 02 00 00 00 04 00
    > 010: 00 00 00 01 ff ff ff ff 00 00 00 00 00 00 00 00
    > 020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > 030: cf 00 00 00 00 01 58 08 cf 00 00 00 00 01 58 08
    > 040: 00 00 02 00 00 00 04 00 00 00 00 00 ff ff ff ff
    > 050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > 060: 00 00 00 00 00 00 00 00 cf 00 00 00 00 01 58 40
    > 070: cf 00 00 00 00 01 58 40 00 00 02 00 00 00 04 00
    > 080: 00 00 00 01 ff ff ff ff 00 00 00 00 00 00 00 00
    > 090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > 0a0: cf 00 00 00 00 01 58 78 cf 00 00 00 00 01 58 78
    > 0b0: 00 00 02 00 00 00 04 00 00 00 00 01 ff ff ff ff
    > ------------[ cut here ]------------
    > kernel BUG at mm/page_alloc.c:2876!
    > cpu 0x0: Vector: 700 (Program Check) at [c0000000005cbbe0]
    > pc: c0000000004b5160: .setup_per_cpu_pageset+0x24/0x48
    > lr: c0000000004b5160: .setup_per_cpu_pageset+0x24/0x48
    > sp: c0000000005cbe60
    > msr: 8000000000029032
    > current = 0xc0000000004fd1b0
    > paca = 0xc0000000004fdd80
    > pid = 0, comm = swapper
    > kernel BUG at mm/page_alloc.c:2876!
    >

    Looks like process_zones() got a kmalloc_node() failure and then crashed in
    the recovery code.

    This:

    --- a/mm/page_alloc.c~a
    +++ a/mm/page_alloc.c
    @@ -2814,6 +2814,8 @@ static int __cpuinit process_zones(int c
    return 0;
    bad:
    for_each_zone(dzone) {
    + if (!populated_zone(zone))
    + continue;
    if (dzone == zone)
    break;
    kfree(zone_pcp(dzone, cpu));
    _
    might help avoid the crash, but why did kmalloc_node() fail?


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