A panic occurred after gfs2 filesystem had a withdrawal: kernel BUG at fs/gfs2/glock.c:492!

Issue

• A panic occurred after gfs2 filesystem had a withdrawal: kernel BUG at fs/gfs2/glock.c:492!

[ 1669.918716] GFS2: fsid=ha_cluster:gfs2fs.0: Error -52 writing to log
[ 1669.918764] GFS2: fsid=ha_cluster:gfs2fs.0: fatal: I/O error
GFS2: fsid=ha_cluster:gfs2fs.0:   block = 66703
GFS2: fsid=ha_cluster:gfs2fs.0:   function = gfs2_ail1_empty_one, file = fs/gfs2/log.c, line = 198
[ 1669.918778] GFS2: fsid=ha_cluster:gfs2fs.0: about to withdraw this file system
[ 1669.927897] GFS2: fsid=ha_cluster:gfs2fs.0: telling LM to unmount
[ 1669.928481] GFS2: fsid=ha_cluster:gfs2fs.0: withdrawn
[.....]
[ 1674.919794] ------------[ cut here ]------------
[ 1674.919810] kernel BUG at fs/gfs2/glock.c:492!
[ 1674.919825] invalid opcode: 0000 [#1] SMP
[ 1674.919841] Modules linked in: gfs2 dlm intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd dm_service_time sg iTCO_wdt iTCO_vendor_support mxm_wmi sb_edac dcdbas ipmi_devintf edac_core pcspkr shpchp mei_me mei lpc_ich ipmi_si ipmi_msghandler acpi_power_meter wmi dm_multipath dm_mod ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit crct10dif_pclmul drm_kms_helper crct10dif_common crc32c_intel syscopyarea sysfillrect sysimgblt fb_sys_fops bnx2x ttm drm qla2xxx ahci mdio libahci tg3 libcrc32c libata scsi_transport_fc i2c_core ptp megaraid_sas scsi_tgt pps_core fjes
[ 1674.920107] CPU: 8 PID: 11882 Comm: kworker/8:2H Not tainted 3.10.0-514.el7.x86_64 #1
[ 1674.920131] Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 2.1.7 06/16/2016
[ 1674.920158] Workqueue: glock_workqueue glock_work_func [gfs2]
[ 1674.920177] task: ffff880270ec3ec0 ti: ffff880268678000 task.ti: ffff880268678000
[ 1674.920199] RIP: 0010:[<ffffffffa04cc659>]  [<ffffffffa04cc659>] do_xmote+0x1d9/0x290 [gfs2]
[ 1674.920228] RSP: 0018:ffff88026867bd50  EFLAGS: 00010286
[ 1674.920245] RAX: 0000000000000000 RBX: ffff880275c88000 RCX: 0000000000000006
[ 1674.920266] RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff88027670f830
[ 1674.920299] RBP: ffff88026867bda0 R08: 0000000000000092 R09: 0000000000000843
[ 1674.920321] R10: 000000000000027f R11: 0000000000000001 R12: ffff880275c88030
[ 1674.920343] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000220
[ 1674.920365] FS:  0000000000000000(0000) GS:ffff880276700000(0000) knlGS:0000000000000000
[ 1674.920390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1674.920408] CR2: 00007f2deb1fb000 CR3: 00000000019ba000 CR4: 00000000001407e0
[ 1674.920430] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1674.920452] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1674.920474] Stack:
[ 1674.921449]  ffff880276716c40 0000000000000000 ffff880274a58000 ffffffffa04f0ba0
[ 1674.922404]  ffffffff810cec2e ffff880275c88000 0000000000000000 ffff880275c88030
[ 1674.923354]  0000000000000000 0000000000000220 ffff88026867bde0 ffffffffa04cc850
[ 1674.924325] Call Trace:
[ 1674.925275]  [<ffffffff810cec2e>] ? dequeue_task_fair+0x41e/0x660
[ 1674.926267]  [<ffffffffa04cc850>] run_queue+0x140/0x270 [gfs2]
[ 1674.927229]  [<ffffffffa04cc9e1>] glock_work_func+0x61/0x140 [gfs2]
[ 1674.928181]  [<ffffffff810a7f3b>] process_one_work+0x17b/0x470
[ 1674.929142]  [<ffffffff810a8d76>] worker_thread+0x126/0x410
[ 1674.930104]  [<ffffffff810a8c50>] ? rescuer_thread+0x460/0x460
[ 1674.931060]  [<ffffffff810b052f>] kthread+0xcf/0xe0
[ 1674.932006]  [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140
[ 1674.932962]  [<ffffffff81696418>] ret_from_fork+0x58/0x90
[ 1674.933910]  [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140
[ 1674.934854] Code: 1f 00 f6 43 38 0c 75 09 45 85 ed 0f 84 a4 00 00 00 89 c6 48 c7 c7 27 29 4f a0 31 c0 e8 a7 2d 1b e1 48 89 de 31 ff e8 87 ef ff ff <0f> 0b 0f 1f 44 00 00 4c 8b 35 09 e6 02 00 4d 85 f6 74 1b 49 8b
[ 1674.936888] RIP  [<ffffffffa04cc659>] do_xmote+0x1d9/0x290 [gfs2]
[ 1674.937877]  RSP <ffff88026867bd50>

• A panic occurs after an IO withdrawal of the gfs2 filesystems because the scsi reservations were revoked for the storage when the cluster node was fenced with fence_scsi.