System crashed with error - IP: qla2xxx_eh_abort+0x19/0x2b0 [qla2xxx]

Issue

• During connectivity issues with SAN devices, the system was crashed with following panic messages:

sd 2:0:0:1: [sdf] Synchronizing SCSI cache
sd 2:0:0:1: [sdf] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
qla2xxx [0000:06:00.1]-5003:2: ISP System Error - mbx1=b056h mbx2=10h mbx3=10h mbx7=0h.
qla2xxx [0000:06:00.1]-d001:2: Firmware dump saved to temp buffer (2/ffffc90006e94000), dump status flags (0x3f).
qla2xxx [0000:06:00.1]-00af:2: Performing ISP error recovery - ha=ffff8805ef754000.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000003
IP: [<ffffffffa0195379>] qla2xxx_eh_abort+0x19/0x2b0 [qla2xxx]
PGD 0 
Oops: 0000 [#1] SMP 
[...]
CPU: 0 PID: 476 Comm: qla2xxx_2_dpc Tainted: G          I    ------------ T 3.10.0-514.16.1.el7.x86_64 #1
Hardware name: HP ProLiant BL460c G7, BIOS I27 08/16/2015
task: ffff8805ef722f10 ti: ffff880bf1bf0000 task.ti: ffff880bf1bf0000
RIP: 0010:[<ffffffffa0195379>]  [<ffffffffa0195379>] qla2xxx_eh_abort+0x19/0x2b0 [qla2xxx]
RSP: 0018:ffff880bf1bf3d30  EFLAGS: 00010286
RAX: ffff8805ef5d0010 RBX: 0000000000000003 RCX: 0000000000009c96
RDX: 0000000000000010 RSI: 0000000000000286 RDI: 0000000000000003
RBP: ffff880bf1bf3d90 R08: 0000000000000286 R09: 0000000000000000
R10: 0000000000000001 R11: ffff880bf1bf39e6 R12: ffff8805f11de740
R13: ffff880bcff60b40 R14: 0000000000000002 R15: ffff880176455380
FS:  0000000000000000(0000) GS:ffff880c0b800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000003 CR3: 00000000019ba000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
00000000926fe15c 00000000926fe15c 0000000000007530 ffffc900067fc008
ffff8805f11de740 ffffffffa021130e 0000000000000000 ffff8805ef754000
ffff8805f11de740 ffff880bcff60b40 0000000000000002 ffff880176455380
Call Trace:
[<ffffffffa0198bd6>] qla2x00_abort_all_cmds+0xf6/0x140 [qla2xxx]
[<ffffffffa01a5932>] qla2x00_abort_isp_cleanup+0x1d2/0x250 [qla2xxx]
[<ffffffffa01a5aa5>] qla2x00_abort_isp+0xf5/0x690 [qla2xxx]
[<ffffffffa019b32f>] qla2x00_do_dpc+0x79f/0x8a0 [qla2xxx]
[<ffffffffa019ab90>] ? qla2x00_relogin+0x290/0x290 [qla2xxx]
[<ffffffff810b0a4f>] kthread+0xcf/0xe0
[<ffffffff810b0980>] ? kthread_create_on_node+0x140/0x140
[<ffffffff81696fd8>] ret_from_fork+0x58/0x90
[<ffffffff810b0980>] ? kthread_create_on_node+0x140/0x140
Code: 00 5b 31 c0 5d c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 38 <48> 8b 07 48 83 bf 18 01 00 00 00 4c 8b 30 b8 02 20 00 00 4d 8b 
RIP  [<ffffffffa0195379>] qla2xxx_eh_abort+0x19/0x2b0 [qla2xxx] <<=== panicked here
 RSP <ffff880bf1bf3d30>
CR2: 0000000000000003