[RHEL 8.10] System crash due to panic in dma_direct_unmap_sg() called from pfc_scsi_unprep_dma_buf() with a NULL argument

Issue

• System crash due to panic in dma_direct_unmap_sg() called from pfc_scsi_unprep_dma_buf() with a NULL argument (details in the Diagnostic Steps section).
• /var/log/messages reports underlying SAN instability issues:

lpfc 0000:5f:00.1: 157: [ 3323.996336] 3:(0):9024 FCP command x12 failed: x0 SNS x0 x0 Data: x8 xf2 x0 x0 x0
Jun 26 20:52:44 localhost kernel: lpfc 0000:5f:00.1: 158: [ 3323.996337] 3:(0):9025 FCP Underrun, expected 254, residual 242 Data: xf2 x12 x0
lpfc 0000:5f:00.1: 159: [ 3323.996418] 3:0373 FCP CQE cmpl: status=x1: CQE: 19720100 00000036 00000018 80010000
lpfc 0000:5f:00.1: 160: [ 3323.996420] 3:(0):9034 FCP cmd x12 failed <0/2> status: x1 result: x18 sid: x140e00 did: x142400 oxid: x1a6c Data: x18 x36 x1972
sd 18:0:0:2: [sde] tag#4657 FAILED Result: hostbyte=DID_TIME_OUT driverbyte=DRIVER_OK cmd_age=30s
sd 18:0:0:2: [sde] tag#4657 CDB: Read(10) 28 00 51 2d 96 60 00 06 00 00
blk_update_request: I/O error, dev sde, sector 1361942112 op 0x0:(READ) flags 0x84700 phys_seg 13 prio class 0