Issue

• During a database restart, our system rebooted with the following visible on the console:

PID: 48601  TASK: ffff884cac33d500  CPU: 1   COMMAND: "db_shutdown.ksh"
 #0 [ffff884a9a26b520] machine_kexec at ffffffff81035b7b
 #1 [ffff884a9a26b580] crash_kexec at ffffffff810c0db2
 #2 [ffff884a9a26b650] oops_end at ffffffff815111d0
 #3 [ffff884a9a26b680] no_context at ffffffff81046bfb
 #4 [ffff884a9a26b6d0] __bad_area_nosemaphore at ffffffff81046e85
 #5 [ffff884a9a26b720] bad_area_nosemaphore at ffffffff81046f53
 #6 [ffff884a9a26b730] __do_page_fault at ffffffff810476b1
 #7 [ffff884a9a26b850] do_page_fault at ffffffff8151311e
 #8 [ffff884a9a26b880] page_fault at ffffffff815104d5
    [exception RIP: _read_lock+9]
    RIP: ffffffff8150fe79  RSP: ffff884a9a26b938  RFLAGS: 00010246
    RAX: ffff884cac33d500  RBX: ffff884a9a26ba08  RCX: ffff884a9a26ba08
    RDX: 0000000000000101  RSI: ffff884a9a26bb28  RDI: 0000000000000004
                                                  ^^^^^^^^^^^^^^^^^^^^^
    RBP: ffff884a9a26b938   R8: 0000000000000000   R9: ffff884f5d533440
    ^^^^^^^^^^^^^^^^^^^^^
    R10: 000000000000005b  R11: 0000000000000000  R12: 0000000000000000
    R13: 0000000000000024  R14: ffff884a9a26ba08  R15: ffffffffffffffe9
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff884a9a26b940] path_init at ffffffff8118ee1a
#10 [ffff884a9a26b980] do_path_lookup at ffffffff811918db
#11 [ffff884a9a26b9b0] do_filp_open at ffffffff8119285b
#12 [ffff884a9a26bb00] filp_open at ffffffff8119354d
#13 [ffff884a9a26bb10] vx_imc_init_module at ffffffffa02211a1 [vxfs]
#14 [ffff884a9a26bbb0] vx_imc_import at ffffffffa0221701 [vxfs]
#15 [ffff884a9a26bc00] vx_detach_fset at ffffffffa03bf4fe [vxfs]
#16 [ffff884a9a26bd20] vx_unmount at ffffffffa044815d [vxfs]
#17 [ffff884a9a26bda0] generic_shutdown_super at ffffffff8118326b
#18 [ffff884a9a26bdc0] kill_block_super at ffffffff81183321
#19 [ffff884a9a26bde0] vx_kill_sb at ffffffffa04462b8 [vxfs]
#20 [ffff884a9a26be00] deactivate_super at ffffffff81183af7
#21 [ffff884a9a26be20] mntput_no_expire at ffffffff811a1b6f
#22 [ffff884a9a26be50] path_put at ffffffff8118f141
#23 [ffff884a9a26be70] free_fs_struct at ffffffff811b2fa3
#24 [ffff884a9a26be90] exit_fs at ffffffff811b31b8
#25 [ffff884a9a26bec0] do_exit at ffffffff81073415
#26 [ffff884a9a26bf40] do_group_exit at ffffffff81073b48
#27 [ffff884a9a26bf70] sys_exit_group at ffffffff81073bd7
#28 [ffff884a9a26bf80] system_call_fastpath at ffffffff8100b072
    RIP: 00000039108ad028  RSP: 00007fff5d431700  RFLAGS: 00010202
    RAX: 00000000000000e7  RBX: ffffffff8100b072  RCX: 0000003910b8f2f0
    RDX: 0000000000000000  RSI: 000000000000003c  RDI: 0000000000000000
    RBP: 0000000000000000   R8: 00000000000000e7   R9: ffffffffffffffa8
    R10: 0000003910b907c0  R11: 0000000000000246  R12: ffffffff81073bd7
    R13: ffff884a9a26bf78  R14: 0000000000000000  R15: 00007fff5d4319a0
    ORIG_RAX: 00000000000000e7  CS: 0033  SS: 002b