crash> bt -f
PID: 4581   TASK: ffff881004af1540  CPU: 8   COMMAND: "ll_ost00_070"
 #0 [ffff881004af3cb8] machine_kexec at ffffffff8103915b
    ffff881004af3cc0: 00000000030a1000 ffff8800030a1000
    ffff881004af3cd0: 00000000030a0000 0000000000000000
    ffff881004af3ce0: 8800000000000000 ffff88030c83ffff
    ffff881004af3cf0: 0000000000000000 ffff881004af3d20
    ffff881004af3d00: ffff88030c832400 ffff88107872ad80
    ffff881004af3d10: ffff881004af3de0 ffffffff810c5e42
 #1 [ffff881004af3d18] crash_kexec at ffffffff810c5e42
    ffff881004af3d20: ffff88041e7c5d80 ffff88107872ad80
    ffff881004af3d30: ffff88030c832400 ffff88041e7c5d80
    ffff881004af3d40: ffff881004af3de0 0000000000000000
    ffff881004af3d50: 0000000000000000 0000000000000001
    ffff881004af3d60: ffffffff81645ba0 0000000000000000
    ffff881004af3d70: 0000000000000001 00000000000027a3
    ffff881004af3d80: 0000000000000000 0000000000000001
    ffff881004af3d90: 0000000000000002 ffffffff81010f15
    ffff881004af3da0: ffffffff810c5ecf 0000000000000010
    ffff881004af3db0: 0000000000000046 ffff881004af3d20
    ffff881004af3dc0: 0000000000000018 0000000000000004
    ffff881004af3dd0: ffffffffa0daf599 ffff88041e7c5d80
    ffff881004af3de0: ffff881004af3e60 ffffffff8152839a
 #2 [ffff881004af3de8] panic at ffffffff8152839a
    ffff881004af3df0: ffffffffa0dbc260 ffffffffa0daf599
    ffff881004af3e00: ffffffff00000008 ffff881004af3e70
    ffff881004af3e10: ffff881004af3e20 0000000000000000
    ffff881004af3e20: 0000000033343335 0000000000000282
    ffff881004af3e30: ffffffff81aa4920 0000000000000000
    ffff881004af3e40: 0000000000000000 0000000000000000
    ffff881004af3e50: ffffffffa151e560 ffffffffa151e560
    ffff881004af3e60: ffff881004af3e80 ffffffffa0d8ceeb
 #3 [ffff881004af3e68] lbug_with_loc at ffffffffa0d8ceeb [libcfs]
    ffff881004af3e70: ffff881004b90000 00000000000000a8
    ffff881004af3e80: ffff881004af3e90 ffffffffa14da67b
 #4 [ffff881004af3e88] osd_key_exit at ffffffffa14da67b [osd_ldiskfs]
    ffff881004af3e90: ffff881004af3eb0 ffffffffa0e5d9f8
 #5 [ffff881004af3e98] lu_context_exit at ffffffffa0e5d9f8 [obdclass]
    ffff881004af3ea0: ffff88041227f140 ffff88040c657800
    ffff881004af3eb0: ffff881004af3f40 ffffffffa0ffd749
 #6 [ffff881004af3eb8] ptlrpc_main at ffffffffa0ffd749 [ptlrpc]
    ffff881004af3ec0: ffff880400000000 ffff88040c657880
    ffff881004af3ed0: 0000000000000000 ffff88107872ad80
    ffff881004af3ee0: 0000002400000000 ffff88040c657868
    ffff881004af3ef0: ffff88040c657848 ffff88041227f178
    ffff881004af3f00: ffff88041e7c5d80 ffff88040c657830
    ffff881004af3f10: ffff8810788e88c0 ffff881078a1f580
    ffff881004af3f20: 0000000000000000 0000000000000000
    ffff881004af3f30: ffffffffa0ffccf0 ffff88041227f140
    ffff881004af3f40: ffff881050ebf6a8 ffffffff8100c20a
 #7 [ffff881004af3f48] kernel_thread at ffffffff8100c20a