Kernel panic with "BUG: unable to handle kernel NULL pointer dereference at 000000000000000d" in RHEL 7 gfs2 environment

Issue

• Kernel panic with "BUG: unable to handle kernel NULL pointer dereference at 000000000000000d".

[93180.421861] BUG: unable to handle kernel NULL pointer dereference at 000000000000000d
[93180.421894] IP: [<ffffffffa07728c1>] gfs2_glock_iter_next+0x31/0x60 [gfs2]
[93180.421918] PGD 3f5b37b067 PUD 3ecb735067 PMD 0
[93180.421935] Oops: 0000 [#1] SMP
[93180.421947] Modules linked in: tcp_lp oracleacfs(POE) oracleadvm(POE) oracleoks(POE) gfs2 dlm fuse xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables bonding ipt_REJECT nf_reject_ipv4 xt_pkttype nf_conntrack_ipv4 nf_defrag_ipv4 oracleasm(OE) xt_conntrack nf_conntrack iptable_filter vfat fat intel_powerclamp coretemp intel_rapl iTCO_wdt iTCO_vendor_support iosf_mbi kvm_intel kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd dm_service_time ses i2c_i801 hpilo sb_edac hpwdt enclosure edac_core lpc_ich pcspkr ipmi_devintf sg shpchp wmi ipmi_si ipmi_msghandler pcc_cpufreq acpi_power_meter dm_multipath binfmt_misc nfsd auth_rpcgss nfs_acl
[93180.422216]  lockd grace sunrpc ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit drm_kms_helper syscopyarea crct10dif_pclmul sysfillrect crct10dif_common sysimgblt crc32c_intel fb_sys_fops ttm tg3 drm ptp pps_core qla2xxx(OE) i2c_core scsi_transport_fc hpsa(OE) scsi_tgt scsi_transport_sas fjes dm_mirror dm_region_hash dm_log dm_mod
[93180.422380] CPU: 21 PID: 30379 Comm: glocktop Tainted: P           OE  ------------   3.10.0-514.21.1.el7.x86_64 #1
[93180.422429] Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 02/17/2017
[93180.422453] task: ffff88352dee4e70 ti: ffff8837bcaa4000 task.ti: ffff8837bcaa4000
[93180.422492] RIP: 0010:[<ffffffffa07728c1>]  [<ffffffffa07728c1>] gfs2_glock_iter_next+0x31/0x60 [gfs2]
[93180.422522] RSP: 0018:ffff8837bcaa7e60  EFLAGS: 00010246
[93180.422538] RAX: fffffffffffffff5 RBX: ffff883aaeb6fd80 RCX: ffffc90019fdf000
[93180.422559] RDX: ffffc9001a19a000 RSI: 000000000000ffff RDI: ffff883aaeb6fd88
[93180.422579] RBP: ffff8837bcaa7e70 R08: ffffffffa07a4fe0 R09: 0000000000003e50
[93180.422599] R10: 0000000000000001 R11: 000000000000000f R12: ffff883aaeb6fd88
[93180.422626] R13: ffff8837bcaa7f48 R14: ffff883dc5e04c40 R15: ffff883f776ec880
[93180.422655] FS:  00007f9ce84c6780(0000) GS:ffff883f7ef40000(0000) knlGS:0000000000000000
[93180.422679] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[93180.422696] CR2: 000000000000000d CR3: 0000003f05e8b000 CR4: 00000000003407e0
[93180.422716] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[93180.422752] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[93180.422773] Stack:
[93180.422780]  ffff883aaeb6fd80 ffff883a9f27fd00 ffff8837bcaa7e88 ffffffffa0772914
[93180.422821]  0000000000000000 ffff8837bcaa7ef8 ffffffff81222c23 0000000000003e50
[93180.422846]  00007f9ce71e5010 ffff883f776ec8b8 00000000003fffff 0000000000003be9
[93180.422870] Call Trace:
[93180.422882]  [<ffffffffa0772914>] gfs2_glock_seq_next+0x24/0x30 [gfs2]
[93180.422906]  [<ffffffff81222c23>] seq_read+0x233/0x3b0
[93180.422922]  [<ffffffff811fe69e>] vfs_read+0x9e/0x170
[93180.422938]  [<ffffffff811ff26f>] SyS_read+0x7f/0xe0
[93180.422954]  [<ffffffff816974c9>] system_call_fastpath+0x16/0x1b
[93180.423913] Code: 48 89 e5 41 54 4c 8d 67 08 53 48 89 fb 0f 1f 44 00 00 4c 89 e7 e8 00 b3 bb e0 48 3d 00 f0 ff ff 48 89 43 28 77 21 48 85 c0 74 17 <48> 8b 50 18 48 39 13 75 de 8b 40 34 85 c0 78 d7 0f 1f 80 00 00
[93180.426010] RIP  [<ffffffffa07728c1>] gfs2_glock_iter_next+0x31/0x60 [gfs2]
[93180.427047]  RSP <ffff8837bcaa7e60>
[93180.428049] CR2: 000000000000000d