Issue

• get_memory_error_data 関数の sb_edac モジュールでパニックが繰り返し発生します。
• システムの起動時または起動後のいずれかのタイミングで断続的にクラッシュが発生します。

crash> sys | grep -i -e rel -e panic
     RELEASE:2.6.32-573.38.1.el6.x86_64
       PANIC:"BUG: unable to handle kernel NULL pointer dereference at 0000000000000038"

crash> bt
PID:7415   TASK: ffff88ff10e24040  CPU:55  COMMAND:"edac-poller"
 #0 [ffff88ff16c736f0] machine_kexec at ffffffff8103d1fb
 #1 [ffff88ff16c73750] crash_kexec at ffffffff810cc632
 #2 [ffff88ff16c73820] oops_end at ffffffff8153d970
 #3 [ffff88ff16c73850] no_context at ffffffff8104e8cb
 #4 [ffff88ff16c738a0] __bad_area_nosemaphore at ffffffff8104eb55
 #5 [ffff88ff16c738f0] bad_area_nosemaphore at ffffffff8104ec23
 #6 [ffff88ff16c73900] __do_page_fault at ffffffff8104f31c
 #7 [ffff88ff16c73a20] do_page_fault at ffffffff8153f8be
 #8 [ffff88ff16c73a50] page_fault at ffffffff8153cc05
    [exception RIP: get_memory_error_data+0x248]
    RIP: ffffffffa02979b8  RSP: ffff88ff16c73b00  RFLAGS:00010246
    RAX:0000000000000000  RBX:0000000000000000  RCX: ffff8aff1d6b1180
    RDX: ffff8aff1d6b1180  RSI:0000000000000246  RDI:0000000000000246
    RBP: ffff88ff16c73d00   R8:0000000000000004   R9: ffff88ff16c73acc
    R10:000000000000007c  R11:0000000000000000  R12: ffffffffa0299ba0
    R13: ffff88ff16c73bbc  R14:0000000000000000  R15:0000000000000000
    ORIG_RAX: ffffffffffffffff  CS:0010  SS:0018
 #9 [ffff88ff16c73d08] sbridge_check_error at ffffffffa029849c [sb_edac]
#10 [ffff88ff16c73e18] edac_mc_workq_function at ffffffffa03d5efa [edac_core]
#11 [ffff88ff16c73e38] worker_thread at ffffffff8109a910
#12 [ffff88ff16c73ee8] kthread at ffffffff810a115e
#13 [ffff88ff16c73f48] kernel_thread at ffffffff8100c28a