MGS panic on umount of MGT [ 2860.466515] BUG: unable to handle kernel NULL pointer dereference at 000000000000001c [ 2860.501712] IP: [] ldlm_process_plain_lock+0x6e/0xb30 [ptlrpc] [ 2860.534877] PGD 0 [ 2860.544669] Oops: 0000 [#1] SMP [ 2860.561965] Modules linked in: osp(OE) mdd(OE) lod(OE) mdt(OE) lfsck(OE) mgs(OE) mgc(OE) osd_zfs(OE) lquota(OE) fid(OE) fld(OE) ptlrpc (OE) obdclass(OE) ko2iblnd(OE) lnet(OE) libcfs(OE) bonding rdma_ucm(OE) ib_ucm(OE) rdma_cm(OE) iw_cm(OE) ib_ipoib(OE) ib_cm(OE) ib_uverbs(OE) ib_umad(OE) mlx5_fpga_tools(OE) mlx4_en(OE) mlx4_ib(OE) mlx4_core(OE) dm_mirror dm_region_hash dm_log zfs(POE) zunicode(POE) zavl(POE) icp(POE) zcommon(POE) znvpair(POE) spl(OE) sb_edac edac_core intel_powerclamp coretemp intel_rapl dm_round_robin iosf_mbi kvm_intel kvm irqbypass crc32_pclmul ipmi_si ghash_clmulni_intel iTCO_wdt dm_multipath sg joydev iTCO_vendor_support aesni_intel ipmi_devintf hpwdt hpilo lrw gf128mul glue_helper ablk_helper cryptd ioatdma pcspkr i2c_i801 wmi dm_mod ipmi_msghandler lpc_ich shpchp dca acpi_cpufreq [ 2860.882396] acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace knem(OE) sunrpc ip_tables xfs libcrc32c mlx5_ib(OE) ib_core(OE) sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm mlx5_core(OE) mlxfw(OE) mlx_compat(OE) tg3 devlink crct10dif_pclmul serio_raw crct10dif_common ptp drm crc32c_intel i2c_core pps_core hpsa(OE) scsi_transport_sas [ 2861.040539] CPU: 27 PID: 4459 Comm: ldlm_bl_24 Tainted: P OE ------------ 3.10.0-693.5.2.el7.x86_64 #1 [ 2861.092592] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 04/25/2017 [ 2861.129810] task: ffff88becf800fd0 ti: ffff88b24b3c0000 task.ti: ffff88b24b3c0000 [ 2861.163313] RIP: 0010:[] [] ldlm_process_plain_lock+0x6e/0xb30 [ptlrpc] [ 2861.207431] RSP: 0018:ffff88b24b3c3be0 EFLAGS: 00010287 [ 2861.231433] RAX: 0000000000000000 RBX: ffff88b774f53800 RCX: ffff88b24b3c3c7c [ 2861.263036] RDX: 0000000000000002 RSI: ffff88b24b3c3c80 RDI: ffff88b774f53800 [ 2861.295068] RBP: ffff88b24b3c3c58 R08: ffff88b24b3c3cd0 R09: ffff88beff257880 [ 2861.327085] R10: ffff88b774f53800 R11: 0000000000000005 R12: ffff885efdd5fcc0 [ 2861.359171] R13: 0000000000000002 R14: ffff88b24b3c3cd0 R15: ffff88b774f53860 [ 2861.391235] FS: 0000000000000000(0000) GS:ffff88befee40000(0000) knlGS:0000000000000000 [ 2861.428020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2861.454884] CR2: 000000000000001c CR3: 0000005e60ab7000 CR4: 00000000003407e0 [ 2861.487917] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2861.520372] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 2861.552721] Stack: [ 2861.562219] ffff88b24b3c3c7c ffff88b24b3c3cd0 ffff88b24b3c3c80 0000000000000000 [ 2861.599583] ffff885efdd5fca0 0000001000000001 ffff885e00000010 ffff88b24b3c3c18 [ 2861.632738] ffff88b24b3c3c18 0000000013b7eb66 0000000000000002 ffff885efdd5fcc0 [ 2861.666158] Call Trace: [ 2861.677268] [] ? ldlm_errno2error+0x60/0x60 [ptlrpc] [ 2861.706930] [] ldlm_reprocess_queue+0x13b/0x2a0 [ptlrpc] [ 2861.738259] [] __ldlm_reprocess_all+0x14d/0x3a0 [ptlrpc] [ 2861.769602] [] ldlm_reprocess_res+0x20/0x30 [ptlrpc] [ 2861.799258] [] cfs_hash_for_each_relax+0x21f/0x400 [libcfs] [ 2861.831735] [] ? ldlm_lock_downgrade+0x320/0x320 [ptlrpc] [ 2861.863592] [] ? ldlm_lock_downgrade+0x320/0x320 [ptlrpc] [ 2861.895390] [] cfs_hash_for_each_nolock+0x75/0x1c0 [libcfs] [ 2861.928211] [] ldlm_reprocess_recovery_done+0x3c/0x110 [ptlrpc] [ 2861.962124] [] ldlm_export_cancel_locks+0x11c/0x130 [ptlrpc] [ 2861.994962] [] ldlm_bl_thread_main+0x4c8/0x700 [ptlrpc] [ 2862.025858] [] ? wake_up_state+0x20/0x20 [ 2862.050898] [] ? ldlm_handle_bl_callback+0x410/0x410 [ptlrpc] [ 2862.086852] [] kthread+0xcf/0xe0 [ 2862.112252] [] ? insert_kthread_work+0x40/0x40 [ 2862.139704] [] ret_from_fork+0x58/0x90 [ 2862.164047] [] ? insert_kthread_work+0x40/0x40 [ 2862.191049] Code: 89 45 a0 74 0d f6 05 b3 ac 94 ff 01 0f 85 34 06 00 00 8b 83 98 00 00 00 39 83 9c 00 00 00 89 45 b8 0f 84 57 09 00 00 48 8b 45 a0 <8b> 40 1c 85 c0 0f 84 7a 09 00 00 48 8b 4d a0 48 89 c8 48 83 c0 [ 2862.276308] RIP [] ldlm_process_plain_lock+0x6e/0xb30 [ptlrpc] [ 2862.309889] RSP [ 2862.325503] CR2: 000000000000001c