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"echo 1 > /proc/sys/vm/compact_memory" results in kernel panic with "RIP: fragmentation_index+114"

Solution Verified - Updated -

Issue

  • echo 1 > /proc/sys/vm/compact_memory にてカーネルパニックになります。Vmcore の解析にて以下のバックトレースが表示されます。
PID:5034   TASK: ffff8800371e2ae0  CPU:1   COMMAND:"bash"
 #0 [ffff88007cfb7960] machine_kexec at ffffffff81035b7b
 #1 [ffff88007cfb79c0] crash_kexec at ffffffff810c0db2
 #2 [ffff88007cfb7a90] oops_end at ffffffff815111d0
 #3 [ffff88007cfb7ac0] die at ffffffff8100f19b
 #4 [ffff88007cfb7af0] do_trap at ffffffff81510a34
 #5 [ffff88007cfb7b50] do_divide_error at ffffffff8100cf7f
 #6 [ffff88007cfb7bf0] divide_error at ffffffff8100bdfb
    [exception RIP: fragmentation_index+114]
    RIP: ffffffff8113a3b2  RSP: ffff88007cfb7ca8  RFLAGS:00010246
    RAX:00000000003be020  RBX:000000000000000c  RCX:0000000000000000
    RDX:0000000000000000  RSI:00000000ffffffff  RDI: ffff880000012c08
    RBP: ffff88007cfb7ca8   R8:0000000000000012   R9:0000000000000f54
    R10:0000000000000000  R11:0000000000000c00  R12: ffff880000012840
    R13:00000000ffffffff  R14:000000000000000e  R15: ffff880000012840
    ORIG_RAX: ffffffffffffffff  CS:0010  SS:0018
 #7 [ffff88007cfb7ca0] zone_watermark_ok at ffffffff8111de6f
 #8 [ffff88007cfb7cb0] compaction_suitable at ffffffff811623d3
 #9 [ffff88007cfb7ce0] compact_zone at ffffffff81162a25
#10 [ffff88007cfb7da0] compact_node at ffffffff8116344c
#11 [ffff88007cfb7e60] sysctl_compaction_handler at ffffffff811634ec
#12 [ffff88007cfb7e80] proc_sys_call_handler at ffffffff811f3097
#13 [ffff88007cfb7ee0] proc_sys_write at ffffffff811f30e4
#14 [ffff88007cfb7ef0] vfs_write at ffffffff81180f98
#15 [ffff88007cfb7f30] sys_write at ffffffff81181891
#16 [ffff88007cfb7f80] system_call_fastpath at ffffffff8100b072
    RIP:00007fcfabe10650  RSP:00007fff902c1710  RFLAGS:00010206
    RAX:0000000000000001  RBX: ffffffff8100b072  RCX:0000000000000400
    RDX:0000000000000002  RSI:00007fcfac709000  RDI:0000000000000001
    RBP:00007fcfac709000   R8:000000000000000a   R9:00007fcfac705700
    R10:00000000ffffffff  R11:0000000000000246  R12:0000000000000002
    R13:00007fcfac0c2780  R14:0000000000000002  R15:00007fcfac0c2780
    ORIG_RAX:0000000000000001  CS:0033  SS:002b

Environment

  • Red Hat Enterprise Linux 6.4

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