RHEL6: Kernel panic at laundromat_main+0x22a/0x3f0 [nfsd]

Issue

• Process nfsd4 panics at laundromat_main+0x22a/0x3f0 [nfsd]

BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
IP: [<ffffffffa05afeba>] laundromat_main+0x22a/0x3f0 [nfsd]
PGD 57b70b067 PUD 3ac275067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:07.0/0000:0e:00.1/host4/rport-4:0-0/target4:0:0/4:0:0:4/state
CPU 2 
Modules linked in: [...] [last unloaded: scsi_wait_scan]

Pid: 16603, comm: nfsd4 Not tainted 2.6.32-358.14.1.el6.x86_64 #1 HP ProLiant DL380 G7
RIP: 0010:[<ffffffffa05afeba>]  [<ffffffffa05afeba>] laundromat_main+0x22a/0x3f0 [nfsd]
RSP: 0018:ffff880611f19de0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88045fb674a8 RCX: ffffe8ffffa1ccc8
RDX: 0000000000000000 RSI: ffff880611f19df0 RDI: ffff88045fb674c8
RBP: ffff880611f19e30 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff880611f19df0 R14: 00000000521da51c R15: 000000000000003c
FS:  0000000000000000(0000) GS:ffff88003f040000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 00000005d0510000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process nfsd4 (pid: 16603, threadinfo ffff880611f18000, task ffff88060e138040)
Stack:
 0000000000000001 0000000000000000 ffff880611f19df0 ffff880611f19df0
<d> ffffffffffffff10 ffffe8ffffa1ccc0 ffffe8ffffa1ccc0 ffffffffa05afc90
<d> ffff880611f19fd8 ffffe8ffffa1ccc8 ffff880611f19ee0 ffffffff81090b00
Call Trace:
 [<ffffffffa05afc90>] ? laundromat_main+0x0/0x3f0 [nfsd]
 [<ffffffff81090b00>] worker_thread+0x170/0x2a0
 [<ffffffff81096cc0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81090990>] ? worker_thread+0x0/0x2a0
 [<ffffffff81096956>] kthread+0x96/0xa0
 [<ffffffff8100c0ca>] child_rip+0xa/0x20
 [<ffffffff810968c0>] ? kthread+0x0/0xa0
 [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
Code: 00 49 8d 5c 24 e0 4c 3b 73 58 78 3c 49 89 c4 f6 05 bb 88 f5 ff 10 0f 85 4a 01 00 00 48 8b 53 20 48 8b 43 28 48 8d 7b 20 4c 89 ee <48> 89 42 08 48 89 10 48 8b 55 c0 e8 c6 91 cd e0 49 81 fc 20 f5 
RIP  [<ffffffffa05afeba>] laundromat_main+0x22a/0x3f0 [nfsd]
 RSP <ffff880611f19de0>
CR2: 0000000000000008