Issue

• RHEL6 server with megaraid_sas hangs during kdump.

• kdump test hung up after 2nd kernel loaded. Following call traces are thrown on console :

         Call Trace:
        [<c2463325>] ? run_timer_softirq+0x35/0x2c0
        [<cacca960>] ? megasas_fire_cmd_gen2+0x30/0x50 [megaraid_sas]
        [<c2473f1b>] ? prepare_to_wait+0x5b/0x60
        [<cacca61d>] ? megasas_issue_blocked_cmd+0x5d/0x90 [megaraid_sas]
        [<c2473c60>] ? autoremove_wake_function+0x0/0x40
        [<cacccc1b>] ? megasas_start_aen+0x11b/0x2a0 [megaraid_sas]
        [<c240d890>] ? dma_generic_alloc_coherent+0x0/0x100
        [<c24b321e>] ? request_threaded_irq+0x14e/0x200
        [<cacd3a13>] ? megasas_probe_one+0xb68/0xe01 [megaraid_sas]
        [<c240f270>] ? nommu_free_coherent+0x0/0x20
        [<c260879b>] ? local_pci_probe+0xb/0x10
        [<c26095a1>] ? pci_device_probe+0x61/0x80
        [<c26b1057>] ? driver_probe_device+0x87/0x290
        [<c2608876>] ? pci_match_device+0x16/0xc0
        [<c26b12d9>] ? __driver_attach+0x79/0x80
        [<c26b1260>] ? __driver_attach+0x0/0x80
        [<c26b0452>] ? bus_for_each_dev+0x52/0x80
        [<c26b0e46>] ? driver_attach+0x16/0x20
        [<c26b1260>] ? __driver_attach+0x0/0x80
        [<c26b07ff>] ? bus_add_driver+0x1cf/0x320
        [<c26094e0>] ? pci_device_remove+0x0/0x40
        [<c26b1563>] ? driver_register+0x63/0x120
        [<c2529ef1>] ? __register_chrdev+0x81/0xe0
        [<cacdc000>] ? megasas_init+0x0/0x1a1 [megaraid_sas]
        [<c26097bd>] ? __pci_register_driver+0x3d/0xb0
        [<cacdc08f>] ? megasas_init+0x8f/0x1a1 [megaraid_sas]
        [<c240303f>] ? do_one_initcall+0x2f/0x1c0
        [<c248f4b4>] ? sys_init_module+0xb4/0x220
        [<c2523dd7>] ? sys_close+0x67/0xb0
        [<c2822b54>] ? syscall_call+0x7/0xb