A GFS2 kernel panic occurred "BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: [<ffffffffa05b69e7>] rgblk_free+0xf7/0x200 [gfs2] on RHEL 6

Issue

• A GFS2 kernel panic occurred "BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: [] rgblk_free+0xf7/0x200 [gfs2]

device eth1 left promiscuous mode
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffffa05b69e7>] rgblk_free+0xf7/0x200 [gfs2]
PGD 2c92d69067 PUD 2d61dc2067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:05.0/0000:11:00.0/host4/rport-4:0-0/target4:0:0/4:0:0:25/state
CPU 16 
Modules linked in: bluetooth rfkill bridge fuse mptctl mptbase gfs2 dlm sctp libcrc32c configfs cpufreq_ondemand acpi_cpufreq freq_table mperf bonding 8021q garp stp llc ipv6 microcode iTCO_wdt iTCO_vendor_support be2net hpwdt hpilo lpc_ich mfd_core i7core_edac edac_core osst st ch power_meter acpi_ipmi ipmi_si ipmi_msghandler netxen_nic ses enclosure sg shpchp ext4 jbd2 mbcache dm_round_robin sr_mod cdrom sd_mod crc_t10dif bfa scsi_transport_fc scsi_tgt pata_acpi ata_generic ata_piix hpsa radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core dm_multipath dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 67853, comm: rm Not tainted 2.6.32-504.el6.x86_64 #1 HP ProLiant DL580 G7
RIP: 0010:[<ffffffffa05b69e7>]  [<ffffffffa05b69e7>] rgblk_free+0xf7/0x200 [gfs2]
RSP: 0018:ffff880123a2bc58  EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000a000682c RCX: ffff880d0ed71800
RDX: ffff880d0ed71850 RSI: 0000000000000850 RDI: ffff880123a2bc68
RBP: ffff880123a2bcb8 R08: 0000000000007f40 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000008 R14: 0000000000000002 R15: ffff880123a2bc68
FS:  00007fa477560700(0000) GS:ffff882078800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000020 CR3: 0000002d6c914000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rm (pid: 67853, threadinfo ffff880123a2a000, task ffff88011e917500)
Stack:
 ffff8827788ff2d0 0000000200000002 ffff880107365ea8 ffff880d0ed71850
<d> ffff882700001a78 ffff881025367650 ffff880123a2bc98 ffff8806eb797140
<d> 00000000a000682c ffff8827788ff2d0 ffff8806eb797140 ffff881029a65c00
Call Trace:
 [<ffffffffa05b6cca>] gfs2_unlink_di+0x4a/0xd0 [gfs2]
 [<ffffffffa05acb0b>] gfs2_unlink_inode+0xab/0xc0 [gfs2]
 [<ffffffffa05ad4de>] gfs2_unlink+0x22e/0x250 [gfs2]
 [<ffffffffa05ad32e>] ? gfs2_unlink+0x7e/0x250 [gfs2]
 [<ffffffffa05ad34f>] ? gfs2_unlink+0x9f/0x250 [gfs2]
 [<ffffffffa05ad387>] ? gfs2_unlink+0xd7/0x250 [gfs2]
 [<ffffffff8119cbe2>] vfs_unlink+0xa2/0xf0
 [<ffffffff8119bdea>] ? lookup_hash+0x3a/0x50
 [<ffffffff8119fca3>] do_unlinkat+0x163/0x260
 [<ffffffff810f0355>] ? call_rcu_sched+0x15/0x20
 [<ffffffff810f036e>] ? call_rcu+0xe/0x10
 [<ffffffff810e5c87>] ? audit_syscall_entry+0x1d7/0x200
 [<ffffffff8119ffd2>] sys_unlinkat+0x22/0x40
 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Code: 41 83 ec 01 45 85 e4 74 63 48 89 de 4c 89 ff e8 40 cb ff ff 48 8b 55 b8 48 83 7a 08 00 0f 85 61 ff ff ff 48 8b 02 be 50 08 00 00 <48> 8b 78 20 48 89 55 a0 e8 1c df bb e0 48 8b 55 a0 48 89 42 08 
RIP  [<ffffffffa05b69e7>] rgblk_free+0xf7/0x200 [gfs2]
 RSP <ffff880123a2bc58>
CR2: 0000000000000020