RHEL8: Kernel panic at __list_add_valid() due to NULL pointer with xprt_complete_bc_request()

Issue

• Kernel panics with the following messages:

[116142.224221] sfc 0000:5e:00.1 ens2f1np1: MC command 0xb inlen 20 mode 1 completed without an interrupt after 10179 ms
[116147.481227] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[116147.481431] PGD 0 P4D 0 
[116147.481597] Oops: 0000 [#1] SMP NOPTI
[116147.481748] CPU: 1 PID: 3954782 Comm: kworker/u34:2 Kdump: loaded Tainted: P           OE    --------- -  - 4.18.0-477.27.1.el8_8.x86_64 #1
[116147.482041] Hardware name: Dell Inc. PowerEdge R740xd/0K5N0V, BIOS 2.16.1 08/17/2022
[116147.482191] Workqueue: xprtiod xs_stream_data_receive_workfn [sunrpc]
[116147.482379] RIP: 0010:__list_add_valid+0x0/0x50
[116147.482527] Code: 4d 89 fa 48 89 44 24 40 eb c8 e8 3b a0 c0 ff 4d 89 fa 49 c7 45 00 00 00 00 00 41 c7 45 08 00 00 00 00 4c 89 74 24 40 eb a9 90 <48> 8b 42 08 49 89 d0 48 39 f0 0f 85 90 00 00 00 48 8b 10 4c 39 c2
[--]
[116147.484234] PKRU: 55555554
[116147.484381] Call Trace:
[116147.484527]  xprt_complete_bc_request+0xdc/0x130 [sunrpc]
[116147.484705]  xs_stream_data_receive+0x3c2/0x4c0 [sunrpc]
[116147.484876]  xs_stream_data_receive_workfn+0x2c/0x40 [sunrpc]
[116147.485044]  process_one_work+0x1a7/0x360
[116147.485195]  worker_thread+0x30/0x390
[116147.485341]  ? create_worker+0x1a0/0x1a0
[116147.485488]  kthread+0x134/0x150
[116147.485631]  ? set_kthread_struct+0x50/0x50
[116147.485775]  ret_from_fork+0x1f/0x40
[116147.485923] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfsv3 nfs_acl nfs lockd grace fscache falcon_lsm_serviceable(PE) falcon_nf_netcontain(PE) falcon_kal(E) falcon_lsm_pinned_15705(E) [--]
[116147.487401] CR2: 0000000000000008