I don't know about kernel, I don't know how to troubleshoot.
When the problem happened, my system kernel crashed, the following is the vmcore-dmesg.txt log ##dmesg logs
[ 378.442884] SPDMD-LUN:[ERROR]lun_del:2218 device nvfile-mgmtd-0 is busy :2
[ 424.511211] XFS (nvfile-storage-0): Mounting V5 Filesystem
[ 424.513045] XFS (nvfile-storage-2): Mounting V5 Filesystem
[ 424.538953] XFS (nvfile-storage-2): Starting recovery (logdev: internal)
[ 424.546536] XFS (nvfile-storage-2): Ending recovery (logdev: internal)
[ 425.512217] XFS (nvfile-storage-0): Starting recovery (logdev: internal)
[ 425.518929] XFS (nvfile-storage-1): Mounting V5 Filesystem
[ 425.520813] XFS (nvfile-storage-3): Mounting V5 Filesystem
[ 426.288987] XFS (nvfile-storage-3): Starting recovery (logdev: internal)
[ 426.475465] XFS (nvfile-storage-1): Starting recovery (logdev: internal)
[ 427.496551] XFS (nvfile-storage-0): Ending recovery (logdev: internal)
[ 428.320932] XFS (nvfile-storage-3): Ending recovery (logdev: internal)
[ 428.977479] XFS (nvfile-storage-1): Ending recovery (logdev: internal)
[ 445.927118] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 445.927685] PGD 0 P4D 0
[ 445.928216] Oops: 0000 [#1] SMP NOPTI
[ 445.928723] CPU: 4 PID: 591 Comm: kworker/u193:1 Kdump: loaded Tainted: G OE --------- - - 4.18.0-305.el8.x86_64 #1
[ 445.929735] Hardware name: Lenovo ThinkSystem SR860 V2/7Z60CTO1WW, BIOS M5E118K-1.52 08/06/2021
[ 445.930305] Workqueue: xfs-cil/nvfile-storage- xlog_cil_push_work [xfs]
[ 445.930910] RIP: 0010:blk_queue_split+0x1c6/0x660
[ 445.933048] Code: c0 45 31 f6 89 44 24 44 89 7c 24 40 31 ff 85 db 0f 84 56 04 00 00 8b 44 24 44 48 89 c1 48 89 44 24 30 48 c1 e1 04 49 03 4d 78 <8b> 41 08 8b 71 0c 48 8b 11 44 29 f8 39 d8 48 89 54 24 48 0f 47 c3
[ 445.936323] RSP: 0018:ffffbcbf9a4bfaf8 EFLAGS: 00010246
[ 445.936711] RAX: 0000000000000000 RBX: 0000000000003000 RCX: 0000000000000000
[ 445.937028] RDX: 0000000000000018 RSI: 0000000000000018 RDI: 0000000000000000
[ 445.937343] RBP: ffffbcbf9a4bfb90 R08: 0000000000000000 R09: ffff940c1965d700
[ 445.937659] R10: 0000000000000000 R11: 0000000000000000 R12: ffff94ca6f590000
[ 445.937979] R13: ffff940bda0ddc80 R14: 0000000000000000 R15: 0000000000000000
[ 445.938304] FS: 0000000000000000(0000) GS:ffff940effd00000(0000) knlGS:0000000000000000
