Issue

• RHEL 6 system panic because of 'emcp' module with following traces:

PID: 8001   TASK: ffff880108bb6aa0  CPU: 0   COMMAND: "oracle"
 #0 [ffff880028207e90] crash_nmi_callback at ffffffff8102d3a6
 #1 [ffff880028207ea0] notifier_call_chain at ffffffff81513705
 #2 [ffff880028207ee0] atomic_notifier_call_chain at ffffffff8151376a
 #3 [ffff880028207ef0] notify_die at ffffffff8109cc1e
 #4 [ffff880028207f20] do_nmi at ffffffff815113cb
 #5 [ffff880028207f50] nmi at ffffffff81510c90
    [exception RIP: _spin_lock_irqsave+0x2f]
    RIP: ffffffff815103ef  RSP: ffff880028203b20  RFLAGS: 00000097
    RAX: 0000000000002c93  RBX: ffff88090b863620  RCX: 0000000000002c92
    RDX: 0000000000000202  RSI: 000000000145b708  RDI: ffff88090ec2fe70
    RBP: ffff880028203b20   R8: 0000000000000001   R9: 0000000000000001
    R10: ffff88090bfe7f80  R11: 0000000000000400  R12: 0000000007800030
    R13: 0000000000000078  R14: 0000000000000000  R15: ffff88090ec2fe70
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #6 [ffff880028203b20] _spin_lock_irqsave at ffffffff815103ef
 #7 [ffff880028203b28] PowerPlatformTopIodone at ffffffffa03876df [emcp]
 #8 [ffff880028203b88] PowerTopIodone at ffffffffa038f1a9 [emcp]
 #9 [ffff880028203bb8] PowerProcessTopIodonePirps at ffffffffa038f347 [emcp]
#10 [ffff880028203bf8] PowerBottomIodoneNew at ffffffffa038f700 [emcp]
#11 [ffff880028203c48] PowerPlatformBottomIodone at ffffffffa038fbf7 [emcp]
#12 [ffff880028203c98] bio_endio at ffffffff811b92cd
#13 [ffff880028203ca8] req_bio_endio at ffffffff8125ad2b
#14 [ffff880028203cd8] blk_update_request at ffffffff8125c7d7
#15 [ffff880028203d38] blk_update_bidi_request at ffffffff8125cb87
#16 [ffff880028203d68] blk_end_bidi_request at ffffffff8125dfcf
#17 [ffff880028203d98] blk_end_request at ffffffff8125e070
#18 [ffff880028203da8] scsi_io_completion at ffffffff8137aa1f
#19 [ffff880028203e28] scsi_finish_command at ffffffff81371a52
#20 [ffff880028203e68] scsi_softirq_done at ffffffff8137b195
#21 [ffff880028203e98] blk_done_softirq at ffffffff81263715
#22 [ffff880028203ec8] __do_softirq at ffffffff81076fb1
#23 [ffff880028203f38] call_softirq at ffffffff8100c1cc
#24 [ffff880028203f50] do_softirq at ffffffff8100de05
#25 [ffff880028203f70] irq_exit at ffffffff81076d95
#26 [ffff880028203f80] do_IRQ at ffffffff815171c5

or

PID: 21461  TASK: ffff880ffbaa2040  CPU: 13  COMMAND: "oracle"
 #0 [ffff88085c4a7e90] crash_nmi_callback at ffffffff810297e6
 #1 [ffff88085c4a7ea0] notifier_call_chain at ffffffff814efc75
 #2 [ffff88085c4a7ee0] atomic_notifier_call_chain at ffffffff814efcda
 #3 [ffff88085c4a7ef0] notify_die at ffffffff81096c3e
 #4 [ffff88085c4a7f20] do_nmi at ffffffff814ed8f3
 #5 [ffff88085c4a7f50] nmi at ffffffff814ed200
    [exception RIP: _spin_lock_irq+40]
    RIP: ffffffff814ec998  RSP: ffff880fa7a0d8f8  RFLAGS: 00000093
    RAX: 0000000000007bff  RBX: ffff881025c86f68  RCX: ffff880b8e68e4c0
    RDX: 0000000000007bfd  RSI: ffff880fa7a0d920  RDI: ffff881028a99c70
    RBP: ffff880fa7a0d8f8   R8: 0000000000000246   R9: 0000000000000000
    R10: 0000000000000000  R11: 0000000000000000  R12: 0000000000000000
    R13: 0000000000000005  R14: 0000000000004000  R15: 0000000007800060
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #6 [ffff880fa7a0d8f8] _spin_lock_irq at ffffffff814ec998
 #7 [ffff880fa7a0d900] __make_request at ffffffff81250390
 #8 [ffff880fa7a0d980] emcp_mrf at ffffffffa026947d [emcp]
 #9 [ffff880fa7a0d9a0] generic_make_request at ffffffff8124ea7e
#10 [ffff880fa7a0da70] submit_bio at ffffffff8124eddd
#11 [ffff880fa7a0dac0] dio_bio_submit at ffffffff811b0f3c
#12 [ffff880fa7a0daf0] __blockdev_direct_IO_newtrunc at ffffffff811b1921
#13 [ffff880fa7a0dbd0] __blockdev_direct_IO at ffffffff811b1e7e
#14 [ffff880fa7a0dc50] blkdev_direct_IO at ffffffff811af4c7
#15 [ffff880fa7a0dc90] generic_file_aio_read at ffffffff81111f4b
#16 [ffff880fa7a0dd70] blkdev_aio_read at ffffffff811aea13
#17 [ffff880fa7a0ddc0] do_sync_read at ffffffff811766da
#18 [ffff880fa7a0def0] vfs_read at ffffffff81176fc5
#19 [ffff880fa7a0df30] sys_pread64 at ffffffff811772f2
#20 [ffff880fa7a0df80] system_call_fastpath at ffffffff8100b072