Issue

• SAN issues causing kernel to crash with the following stack trace in the vmcore

crash> bt
PID: 615    TASK: ffff89ddf4bd4f10  CPU: 0   COMMAND: "scsi_eh_14"
 #0 [ffff89be356d3978] machine_kexec at ffffffffae460b2a
 #1 [ffff89be356d39d8] __crash_kexec at ffffffffae513402
 #2 [ffff89be356d3aa8] crash_kexec at ffffffffae5134f0
 #3 [ffff89be356d3ac0] oops_end at ffffffffaeb17768
 #4 [ffff89be356d3ae8] no_context at ffffffffaeb06f98
 #5 [ffff89be356d3b38] __bad_area_nosemaphore at ffffffffaeb0702f
 #6 [ffff89be356d3b88] bad_area_nosemaphore at ffffffffaeb071a0
 #7 [ffff89be356d3b98] __do_page_fault at ffffffffaeb1a720
 #8 [ffff89be356d3c00] do_page_fault at ffffffffaeb1a915
 #9 [ffff89be356d3c30] page_fault at ffffffffaeb16768
    [exception RIP: qla2x00_eh_wait_on_command+26]
    RIP: ffffffffc04ec76a  RSP: ffff89be356d3ce8  RFLAGS: 00010286
    RAX: 0000000108aab700  RBX: ffff89d065228000  RCX: ffff89ddfbd7b740
    RDX: 00000000000004e3  RSI: ffff89d065228a80  RDI: ffff89d065228000
    RBP: ffff89be356d3cf0   R8: ffff89da09b6d080   R9: 0000000000004000
    R10: ffff89ddf4857740  R11: 00000000000007d3  R12: 0000000000000000
    R13: ffff89ddfbd7b740  R14: 0000000000000000  R15: ffff89d065228000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#10 [ffff89be356d3cf8] qla2x00_eh_wait_for_pending_commands at ffffffffc04f027a [qla2xxx]
#11 [ffff89be356d3d40] qla2xxx_eh_bus_reset at ffffffffc04f768a [qla2xxx]
#12 [ffff89be356d3d80] scsi_try_bus_reset at ffffffffae89d406
#13 [ffff89be356d3da8] scsi_eh_ready_devs at ffffffffae89f2f1
#14 [ffff89be356d3e30] scsi_error_handler at ffffffffae8a0acc
#15 [ffff89be356d3ec8] kthread at ffffffffae4bae31

OR , In another crash with similar race condition the stack traces were

crash> bt
PID: 618    TASK: ffff9f81fa340000  CPU: 0   COMMAND: "scsi_eh_14"
 #0 [ffff9f81fbd03968] machine_kexec at ffffffffa3060b2a
 #1 [ffff9f81fbd039c8] __crash_kexec at ffffffffa3113402
 #2 [ffff9f81fbd03a98] crash_kexec at ffffffffa31134f0
 #3 [ffff9f81fbd03ab0] oops_end at ffffffffa3717768
 #4 [ffff9f81fbd03ad8] no_context at ffffffffa3706f98
 #5 [ffff9f81fbd03b28] __bad_area_nosemaphore at ffffffffa370702f
 #6 [ffff9f81fbd03b78] bad_area_nosemaphore at ffffffffa37071a0
 #7 [ffff9f81fbd03b88] __do_page_fault at ffffffffa371a720
 #8 [ffff9f81fbd03bf0] do_page_fault at ffffffffa371a915
 #9 [ffff9f81fbd03c20] page_fault at ffffffffa3716768
    [exception RIP: qla2x00_eh_wait_for_pending_commands+170]
    RIP: ffffffffc038324a  RSP: ffff9f81fbd03cd8  RFLAGS: 00010046
    RAX: 0000000000000286  RBX: ffff9f61f492b040  RCX: 0000000000000000
    RDX: 0000000000000338  RSI: 00000000000007d3  RDI: 0000000000000000
    RBP: ffff9f81fbd03d10   R8: ffff9f61fc4f7780   R9: ffffffffa31969c7
    R10: ffff9f61f450c000  R11: 00000000000007d3  R12: 0000000000000003
    R13: ffff9f61f492d740  R14: 0000000000000002  R15: ffff9f5f3ab68a80
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#10 [ffff9f81fbd03d18] __qla2xxx_eh_generic_reset at ffffffffc038375b [qla2xxx]
#11 [ffff9f81fbd03d80] qla2xxx_eh_device_reset at ffffffffc038390f [qla2xxx]
#12 [ffff9f81fbd03d90] scsi_try_bus_device_reset at ffffffffa349ce6d
#13 [ffff9f81fbd03da8] scsi_eh_ready_devs at ffffffffa349f06f
#14 [ffff9f81fbd03e30] scsi_error_handler at ffffffffa34a0acc
#15 [ffff9f81fbd03ec8] kthread at ffffffffa30bae31
crash>