I see the same problem with Ubuntu 18 and Kernel 4.15.0-115 and 117. Massive trouble on ocfs2 based mounts. Writing isn't possible. A serious issue as all clustered systems are not working. Processes trying to write on the filesystem are hanging without any chance to kill them except a reboot. Linux 10397-w2 4.15.0-117-generic #118-Ubuntu SMP Fri Sep 4 20:02:41 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Description: Ubuntu 18.04.5 LTS Release: 18.04 Sep 10 08:33:15 10397-w2 kernel: [55129.020995] BUG: unable to handle kernel paging request at 0000000200000088 Sep 10 08:33:15 10397-w2 kernel: [55129.021604] IP: _raw_spin_lock+0x10/0x30 Sep 10 08:33:15 10397-w2 kernel: [55129.021942] PGD 0 P4D 0 Sep 10 08:33:15 10397-w2 kernel: [55129.022162] Oops: 0002 [#1] SMP PTI Sep 10 08:33:15 10397-w2 kernel: [55129.022464] Modules linked in: ocfs2 quota_tree ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 nf_log_ipv6 ip6table_filter ip6_tables xt_comment ipt_REJECT nf_reject_ipv4 xt_owner xt_tcpudp xt_conntrack nf_log_ipv4 nf_log_common xt_LOG iptable_filter nf_conntrack_ftp nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ppdev pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf serio_raw intel_pch_thermal shpchp ie31200_edac wmi parport_pc parport mac_hid video acpi_pad sch_fq_codel drbd lru_cache ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 Sep 10 08:33:15 10397-w2 kernel: [55129.028575] async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear raid1 e1000e ahci nvme ptp psmouse libahci nvme_core pps_core Sep 10 08:33:15 10397-w2 kernel: [55129.029958] CPU: 6 PID: 22360 Comm: rsync Not tainted 4.15.0-117-generic #118-Ubuntu Sep 10 08:33:15 10397-w2 kernel: [55129.030627] Hardware name: FUJITSU D3417-B1/D3417-B1, BIOS V5.0.0.11 R1.21.0.SR.2 for D3417-B1x 07/14/2017 Sep 10 08:33:15 10397-w2 kernel: [55129.031566] RIP: 0010:_raw_spin_lock+0x10/0x30 Sep 10 08:33:15 10397-w2 kernel: [55129.031979] RSP: 0018:ffffb763063c7a68 EFLAGS: 00010246 Sep 10 08:33:15 10397-w2 kernel: [55129.032430] RAX: 0000000000000000 RBX: 0000000200000000 RCX: 00000000ffffffff Sep 10 08:33:15 10397-w2 kernel: [55129.033045] RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000200000088 Sep 10 08:33:15 10397-w2 kernel: [55129.047260] RBP: ffffb763063c7a68 R08: 0000000000000000 R09: 0000000000000000 Sep 10 08:33:15 10397-w2 kernel: [55129.061473] R10: 0000000000000005 R11: 0000000000000c65 R12: 0000000200000088 Sep 10 08:33:15 10397-w2 kernel: [55129.075691] R13: ffff8c862039c348 R14: ffff8c861ee34a08 R15: 00000000ffffffff Sep 10 08:33:15 10397-w2 kernel: [55129.089801] FS: 00007f38b6f12b80(0000) GS:ffff8c866e580000(0000) knlGS:0000000000000000 Sep 10 08:33:15 10397-w2 kernel: [55129.117370] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 10 08:33:15 10397-w2 kernel: [55129.131552] CR2: 0000000200000088 CR3: 0000000969088003 CR4: 00000000003606e0 Sep 10 08:33:15 10397-w2 kernel: [55129.146101] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Sep 10 08:33:15 10397-w2 kernel: [55129.160343] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Sep 10 08:33:15 10397-w2 kernel: [55129.174140] Call Trace: Sep 10 08:33:15 10397-w2 kernel: [55129.187464] igrab+0x1e/0x50 Sep 10 08:33:15 10397-w2 kernel: [55129.200419] ocfs2_get_system_file_inode+0x67/0x2f0 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.213351] ? _cond_resched+0x19/0x40 Sep 10 08:33:15 10397-w2 kernel: [55129.225919] ? ocfs2_inode_cache_io_unlock+0x12/0x20 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.238438] ocfs2_reserve_suballoc_bits+0x4d/0x420 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.250753] ocfs2_steal_resource+0x7d/0xf0 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.262730] ocfs2_reserve_new_metadata_blocks+0x99/0x360 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.274584] ? ocfs2_num_free_extents+0x6c/0x160 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.286249] ocfs2_remove_btree_range+0x542/0x780 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.297755] ocfs2_commit_truncate+0x14b/0x750 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.308942] ? jbd2_journal_stop+0xf6/0x3e0 Sep 10 08:33:15 10397-w2 kernel: [55129.319878] ? ocfs2_allocate_extend_trans+0x1a0/0x1a0 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.330783] ocfs2_wipe_inode+0x66b/0x7e0 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.341452] ocfs2_evict_inode+0x4f3/0x810 [ocfs2] Sep 10 08:33:15 10397-w2 kernel: [55129.351856] evict+0xca/0x1a0 Sep 10 08:33:15 10397-w2 kernel: [55129.361858] iput+0x19c/0x230 Sep 10 08:33:15 10397-w2 kernel: [55129.371620] do_unlinkat+0x19c/0x320 Sep 10 08:33:15 10397-w2 kernel: [55129.381359] SyS_unlink+0x1f/0x30 Sep 10 08:33:15 10397-w2 kernel: [55129.390865] do_syscall_64+0x73/0x130 Sep 10 08:33:15 10397-w2 kernel: [55129.400481] entry_SYSCALL_64_after_hwframe+0x41/0xa6 Sep 10 08:33:15 10397-w2 kernel: [55129.410282] RIP: 0033:0x7f38b6402e57 Sep 10 08:33:15 10397-w2 kernel: [55129.420039] RSP: 002b:00007ffc288ffa18 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 Sep 10 08:33:15 10397-w2 kernel: [55129.439791] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f38b6402e57 Sep 10 08:33:15 10397-w2 kernel: [55129.449986] RDX: 0000000000000000 RSI: 0000000000008124 RDI: 00007ffc28900db0 Sep 10 08:33:15 10397-w2 kernel: [55129.460049] RBP: 00007ffc28900db0 R08: 00005633eee408b0 R09: 0000000000000000 Sep 10 08:33:15 10397-w2 kernel: [55129.470000] R10: 000000000000000a R11: 0000000000000246 R12: 0000000000008124 Sep 10 08:33:15 10397-w2 kernel: [55129.480022] R13: 0000000000000000 R14: 0000000000008000 R15: 0000000000008124 Sep 10 08:33:15 10397-w2 kernel: [55129.490015] Code: ff 01 00 00 75 06 48 89 d8 5b 5d c3 e8 aa 12 72 ff 48 89 d8 5b 5d c3 0f 1f 40 00 0f 1f 44 00 00 55 48 89 e5 31 c0 ba 01 00 00 00 0f b1 17 85 c0 75 02 5d c3 89 c6 e8 8f fb 71 ff 66 90 5d c3 Sep 10 08:33:15 10397-w2 kernel: [55129.520540] RIP: _raw_spin_lock+0x10/0x30 RSP: ffffb763063c7a68 Sep 10 08:33:15 10397-w2 kernel: [55129.530936] CR2: 0000000200000088 Sep 10 08:33:15 10397-w2 kernel: [55129.541139] ---[ end trace d03bfe379ce318d0 ]---