Issue

o Repeated soft lockup warnings noted in dmesg or syslog

crash> log | grep  "BUG: soft lockup" | head
[1543147.645191] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 23s! [ofsFcbPrCb:108055]
[1543175.646127] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 23s! [ofsFcbPrCb:108055]
[1543215.647464] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543243.648400] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543271.649335] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543299.650272] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543327.651209] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543355.652144] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 22s! [ofsFcbPrCb:108055]
[1543395.653481] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 23s! [ofsFcbPrCb:108055]
[1543423.654418] NMI watchdog: BUG: soft lockup - CPU#62 stuck for 23s! [ofsFcbPrCb:108055]

o Stack traces similar to below:

crash> bt
PID: 108055  TASK: ffff8801196a9fa0  CPU: 62  COMMAND: "ofsFcbPrCb"
 #0 [ffff887e7d988e48] crash_nmi_callback at ffffffff810502b7
 #1 [ffff887e7d988e58] nmi_handle at ffffffff816b892c
 #2 [ffff887e7d988eb0] do_nmi at ffffffff816b8b5d
 #3 [ffff887e7d988ef0] end_repeat_nmi at ffffffff816b7d89
    [exception RIP: lockref_put_or_lock+0x8]
    RIP: ffffffff81338418  RSP: ffff880100777c10  RFLAGS: 00000286
    RAX: 0000000000000000  RBX: ffff880107ccfbc0  RCX: 0000000200000000
    RDX: 0000000000000000  RSI: ffff880f8096b448  RDI: ffff880107ccfc18
    RBP: ffff880100777c18   R8: 0000000000000101   R9: ffff880100777bf0
    R10: 0000000000000000  R11: 0000000000000000  R12: ffff880107ccfc18
    R13: ffff880f8096af68  R14: ffff880f8096b330  R15: ffff880f8096aed0
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #4 [ffff880100777c10] lockref_put_or_lock at ffffffff81338418
 #5 [ffff880100777c20] dput at ffffffff8121d530
 #6 [ffff880100777c40] OfsFcbPruneVCB at ffffffffc10d8f48 [oracleacfs]
 #7 [ffff880100777d00] OfsFcbPrunerCb at ffffffffc10d91f3 [oracleacfs]
 #8 [ffff880100777d40] KsOsdInvokeCallback at ffffffffc064f8ca [oracleoks]
 #9 [ffff880100777d98] Ks_invokeCallback at ffffffffc0698751 [oracleoks]
#10 [ffff880100777db8] Ks_processRequests at ffffffffc0699f33 [oracleoks]
#11 [ffff880100777e58] Ks_main at ffffffffc069a5cb [oracleoks]
#12 [ffff880100777e98] KsKthreadRun at ffffffffc064f82a [oracleoks]
#13 [ffff880100777ec8] kthread at ffffffff810b4031
#14 [ffff880100777f50] ret_from_fork at ffffffff816c0577