Created attachment 290635 [details] Kernel config Hello, When running rtorrent my kernel eventually will not write to the disk causing all access to md7 to hang and eventually the kernel will become totally unresponsive. I'd find the file and report to the correct maintainer, but the docs are incomplete when it comes to discovering the source of the hung tasks in my case. I have filed bugs to correct this. Keywords: Hung tasks, Lockup, reiserfs, RAID. Linux version 4.14.184-nopreempt-AMDGPU-dav9 (root@Phenom-II-x6) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)) #1 SMP Fri Jun 19 17:02:34 UTC 2020 I didn't have Internet before 4.9.X so I can't say if any version of the Linux kernel didn't have this problem. [68812.480459] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480464] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480469] CacheThread_Blo D 0 9414 9082 0x00000080 [68812.480476] Call Trace: [68812.480494] __schedule+0x29e/0x6c0 [68812.480505] schedule+0x32/0x80 [68812.480513] schedule_preempt_disabled+0xa/0x10 [68812.480520] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480550] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480570] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480586] ? __switch_to_asm+0x35/0x70 [68812.480588] ? __switch_to_asm+0x41/0x70 [68812.480590] ? __switch_to_asm+0x35/0x70 [68812.480592] ? __switch_to_asm+0x41/0x70 [68812.480593] ? __switch_to_asm+0x35/0x70 [68812.480595] ? __switch_to_asm+0x41/0x70 [68812.480597] ? __switch_to_asm+0x35/0x70 [68812.480601] journal_begin+0x80/0x140 [reiserfs] [68812.480606] reiserfs_dirty_inode+0x3d/0xa0 [reiserfs] [68812.480609] ? __switch_to+0x1ee/0x3f0 [68812.480610] ? __switch_to+0x1ee/0x3f0 [68812.480612] __mark_inode_dirty+0x163/0x350 [68812.480615] generic_update_time+0x79/0xc0 [68812.480617] ? current_time+0x38/0x70 [68812.480619] file_update_time+0xbe/0x110 [68812.480622] __generic_file_write_iter+0x99/0x1b0 [68812.480624] generic_file_write_iter+0xe2/0x1c0 [68812.480626] __vfs_write+0x102/0x180 [68812.480628] vfs_write+0xb0/0x190 [68812.480630] SyS_pwrite64+0x90/0xb0 [68812.480632] do_syscall_64+0x6e/0x110 [68812.480634] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480637] RIP: 0033:0x7f8a92976983 [68812.480638] RSP: 002b:00007f8a779e1630 EFLAGS: 00000293 ORIG_RAX: 0000000000000012 [68812.480640] RAX: ffffffffffffffda RBX: 00007f8a779e1640 RCX: 00007f8a92976983 [68812.480641] RDX: 0000000000000128 RSI: 000001790ddf3c00 RDI: 0000000000000040 [68812.480642] RBP: 00007f8a779e16f0 R08: 00007f8a779e1558 R09: 0000000000000001 [68812.480643] R10: 0000000000002000 R11: 0000000000000293 R12: 0000000000002000 [68812.480644] R13: 000001790a6b8dd0 R14: 000001790ddf3c00 R15: 0000000000000128 [68812.480647] INFO: task ThreadPoolSingl:9908 blocked for more than 480 seconds. [68812.480648] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480650] ThreadPoolSingl D 0 9908 9082 0x00000080 [68812.480651] Call Trace: [68812.480653] __schedule+0x29e/0x6c0 [68812.480655] schedule+0x32/0x80 [68812.480657] schedule_preempt_disabled+0xa/0x10 [68812.480658] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480664] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480668] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480672] ? reiserfs_lookup+0xb5/0x160 [reiserfs] [68812.480677] journal_begin+0x80/0x140 [reiserfs] [68812.480681] reiserfs_create+0xfc/0x210 [reiserfs] [68812.480685] path_openat+0x1419/0x14d0 [68812.480687] ? futex_wake+0x91/0x170 [68812.480689] do_filp_open+0x99/0x110 [68812.480693] ? __check_object_size+0xfa/0x1a0 [68812.480695] ? __alloc_fd+0x3d/0x160 [68812.480696] ? do_sys_open+0x12e/0x210 [68812.480698] do_sys_open+0x12e/0x210 [68812.480700] do_syscall_64+0x6e/0x110 [68812.480702] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480703] RIP: 0033:0x7f8a8c48770d [68812.480704] RSP: 002b:00007f8a73eeb220 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [68812.480706] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8a8c48770d [68812.480707] RDX: 0000000000000180 RSI: 00000000000000c2 RDI: 00000179286b1ae0 [68812.480708] RBP: 000000000003a2f8 R08: 000000000000c0c1 R09: 000001792b1b04e0 [68812.480709] R10: 0000000000000000 R11: 0000000000000293 R12: 00000179286b1b1a [68812.480710] R13: 8421084210842109 R14: 00000000000000c2 R15: 00007f8a8c515540 [68812.480713] INFO: task ThreadPoolForeg:24062 blocked for more than 480 seconds. [68812.480714] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480715] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480717] ThreadPoolForeg D 0 24062 9082 0x00000080 [68812.480718] Call Trace: [68812.480721] __schedule+0x29e/0x6c0 [68812.480723] ? __switch_to_asm+0x35/0x70 [68812.480724] schedule+0x32/0x80 [68812.480726] schedule_preempt_disabled+0xa/0x10 [68812.480727] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480729] ? __switch_to_asm+0x35/0x70 [68812.480734] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480739] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480742] ? __remove_hrtimer+0x35/0x70 [68812.480743] ? hrtimer_try_to_cancel+0xbd/0x110 [68812.480748] journal_begin+0x80/0x140 [reiserfs] [68812.480752] reiserfs_dirty_inode+0x3d/0xa0 [reiserfs] [68812.480754] ? get_futex_key+0x406/0x4b0 [68812.480756] __mark_inode_dirty+0x163/0x350 [68812.480757] generic_update_time+0x79/0xc0 [68812.480759] ? current_time+0x38/0x70 [68812.480761] file_update_time+0xbe/0x110 [68812.480763] __generic_file_write_iter+0x99/0x1b0 [68812.480764] generic_file_write_iter+0xe2/0x1c0 [68812.480766] __vfs_write+0x102/0x180 [68812.480768] vfs_write+0xb0/0x190 [68812.480769] SyS_write+0x5a/0xd0 [68812.480771] do_syscall_64+0x6e/0x110 [68812.480773] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480774] RIP: 0033:0x7f8a929761cd [68812.480775] RSP: 002b:00007f8a6d2a4f30 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [68812.480777] RAX: ffffffffffffffda RBX: 00007f8a6d2a4f40 RCX: 00007f8a929761cd [68812.480778] RDX: 0000000000000007 RSI: 00007f8a6d2a52a8 RDI: 0000000000000155 [68812.480779] RBP: 00007f8a6d2a4fe0 R08: 0000000000000000 R09: 0000000000000001 [68812.480780] R10: 0000a89983efe451 R11: 0000000000000293 R12: 0000017919e27380 [68812.480781] R13: 00007f8a6d2a52a8 R14: 0000000000000007 R15: 0000000000000000 [68812.480790] INFO: task ThreadPoolForeg:26717 blocked for more than 480 seconds. [68812.480791] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480792] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480793] ThreadPoolForeg D 0 26717 9403 0x00000080 [68812.480794] Call Trace: [68812.480796] __schedule+0x29e/0x6c0 [68812.480798] schedule+0x32/0x80 [68812.480799] schedule_preempt_disabled+0xa/0x10 [68812.480800] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480806] ? flush_commit_list+0x1fa/0x670 [reiserfs] [68812.480810] flush_commit_list+0x1fa/0x670 [reiserfs] [68812.480815] flush_commit_list+0x11f/0x670 [reiserfs] [68812.480820] do_journal_end+0xc82/0xda0 [reiserfs] [68812.480825] reiserfs_commit_for_inode+0x201/0x220 [reiserfs] [68812.480830] reiserfs_sync_file+0x6b/0xe0 [reiserfs] [68812.480832] do_fsync+0x38/0x60 [68812.480834] SyS_fdatasync+0xf/0x20 [68812.480836] do_syscall_64+0x6e/0x110 [68812.480838] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480839] RIP: 0033:0x7fe3c993384d [68812.480840] RSP: 002b:00007fe3be489dd0 EFLAGS: 00000293 ORIG_RAX: 000000000000004b [68812.480842] RAX: ffffffffffffffda RBX: 000035c333be8500 RCX: 00007fe3c993384d [68812.480843] RDX: 0000000000000008 RSI: 0000000000000002 RDI: 000000000000003b [68812.480844] RBP: 00007fe3be489e10 R08: 0000000000000001 R09: 0000000000000001 [68812.480845] R10: 000000000000c400 R11: 0000000000000293 R12: 0000000000000000 [68812.480846] R13: d763a120f905d5d9 R14: 0000000000000000 R15: 0000000000001000 [68812.480848] INFO: task ThreadPoolForeg:27786 blocked for more than 480 seconds. [68812.480849] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480850] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480850] ThreadPoolForeg D 0 27786 9403 0x00000080 [68812.480851] Call Trace: [68812.480853] __schedule+0x29e/0x6c0 [68812.480855] schedule+0x32/0x80 [68812.480856] schedule_preempt_disabled+0xa/0x10 [68812.480858] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480863] ? flush_commit_list+0x1fa/0x670 [reiserfs] [68812.480867] flush_commit_list+0x1fa/0x670 [reiserfs] [68812.480872] flush_commit_list+0x11f/0x670 [reiserfs] [68812.480877] do_journal_end+0xc82/0xda0 [reiserfs] [68812.480882] reiserfs_commit_for_inode+0x201/0x220 [reiserfs] [68812.480886] reiserfs_sync_file+0x6b/0xe0 [reiserfs] [68812.480896] do_fsync+0x38/0x60 [68812.480897] SyS_fdatasync+0xf/0x20 [68812.480899] do_syscall_64+0x6e/0x110 [68812.480900] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480901] RIP: 0033:0x7fe3c993384d [68812.480902] RSP: 002b:00007fe3ba3163c0 EFLAGS: 00000293 ORIG_RAX: 000000000000004b [68812.480903] RAX: ffffffffffffffda RBX: 00007fe3ba3163d0 RCX: 00007fe3c993384d [68812.480904] RDX: 000035c3339eca28 RSI: 0000000000000000 RDI: 000000000000003c [68812.480905] RBP: 00007fe3ba316440 R08: 0000000000000000 R09: 0000000000000001 [68812.480906] R10: 003582f4f668320e R11: 0000000000000293 R12: 0000000000000000 [68812.480907] R13: 000000000003bd88 R14: 00007fe3ba3164e0 R15: 0000000000000000 [68812.480909] INFO: task ThreadPoolForeg:28044 blocked for more than 480 seconds. [68812.480910] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480911] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480911] ThreadPoolForeg D 0 28044 9403 0x00000080 [68812.480912] Call Trace: [68812.480914] __schedule+0x29e/0x6c0 [68812.480916] schedule+0x32/0x80 [68812.480917] schedule_preempt_disabled+0xa/0x10 [68812.480918] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480923] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480927] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480930] ? reiserfs_lookup+0xb5/0x160 [reiserfs] [68812.480934] journal_begin+0x80/0x140 [reiserfs] [68812.480938] reiserfs_create+0xfc/0x210 [reiserfs] [68812.480940] path_openat+0x1419/0x14d0 [68812.480942] ? account_entity_dequeue+0x30/0x90 [68812.480944] ? sched_clock_cpu+0xc/0xb0 [68812.480945] ? task_change_group_fair+0xda/0x140 [68812.480947] do_filp_open+0x99/0x110 [68812.480949] ? check_preempt_wakeup+0x144/0x230 [68812.480951] ? __check_object_size+0xfa/0x1a0 [68812.480952] ? __alloc_fd+0x3d/0x160 [68812.480953] ? do_sys_open+0x12e/0x210 [68812.480955] do_sys_open+0x12e/0x210 [68812.480956] do_syscall_64+0x6e/0x110 [68812.480958] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480959] RIP: 0033:0x7fe3cfe1c85d [68812.480960] RSP: 002b:00007fe3bcc87240 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [68812.480961] RAX: ffffffffffffffda RBX: 00007fe3bcc87250 RCX: 00007fe3cfe1c85d [68812.480962] RDX: 0000000000000180 RSI: 00000000000000c2 RDI: 000035c3367230c0 [68812.480963] RBP: 00007fe3bcc872e0 R08: 0000000000000000 R09: 0000000000000001 [68812.480964] R10: 00010c8f66b34755 R11: 0000000000000293 R12: 00000000000000c2 [68812.480965] R13: 00007fe3bcc87350 R14: 000035c335ebe9c0 R15: 0000000000008062 [68812.480967] INFO: task ThreadPoolForeg:28428 blocked for more than 480 seconds. [68812.480967] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480968] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480969] ThreadPoolForeg D 0 28428 9403 0x00000080 [68812.480970] Call Trace: [68812.480971] __schedule+0x29e/0x6c0 [68812.480973] schedule+0x32/0x80 [68812.480974] schedule_preempt_disabled+0xa/0x10 [68812.480976] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480980] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480984] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480988] ? reiserfs_lookup+0xb5/0x160 [reiserfs] [68812.480992] journal_begin+0x80/0x140 [reiserfs] [68812.480995] reiserfs_create+0xfc/0x210 [reiserfs] [68812.480997] path_openat+0x1419/0x14d0 [68812.480999] do_filp_open+0x99/0x110 [68812.481002] ? __check_object_size+0xfa/0x1a0 [68812.481003] ? __alloc_fd+0x3d/0x160 [68812.481004] ? do_sys_open+0x12e/0x210 [68812.481005] do_sys_open+0x12e/0x210 [68812.481007] do_syscall_64+0x6e/0x110 [68812.481008] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.481009] RIP: 0033:0x7fe3cfe1c85d [68812.481010] RSP: 002b:00007fe3bd488340 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [68812.481012] RAX: ffffffffffffffda RBX: 00007fe3bd488350 RCX: 00007fe3cfe1c85d [68812.481013] RDX: 0000000000000180 RSI: 0000000000000241 RDI: 000035c338f629c0 [68812.481013] RBP: 00007fe3bd4883e0 R08: 0000000000000000 R09: 0000000000000001 [68812.481014] R10: 00013f185b0ec000 R11: 0000000000000293 R12: 0000000000000241 [68812.481015] R13: 000035c336840210 R14: 00007fe3bd488460 R15: 0000000000008048 [68812.481279] INFO: task rtorrent main:16442 blocked for more than 480 seconds. [68812.481280] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.481280] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.481281] rtorrent main D 0 16442 9209 0x00000080 [68812.481282] Call Trace: [68812.481284] __schedule+0x29e/0x6c0 [68812.481285] schedule+0x32/0x80 [68812.481287] schedule_preempt_disabled+0xa/0x10 [68812.481288] __mutex_lock.isra.1+0x26b/0x4e0 [68812.481293] ? flush_commit_list+0x1fa/0x670 [reiserfs] [68812.481297] flush_commit_list+0x1fa/0x670 [reiserfs] [68812.481301] get_list_bitmap+0x81/0xd0 [reiserfs] [68812.481306] do_journal_end+0xbcf/0xda0 [reiserfs] [68812.481310] reiserfs_dirty_inode+0x97/0xa0 [reiserfs] [68812.481312] __mark_inode_dirty+0x163/0x350 [68812.481314] generic_update_time+0x79/0xc0 [68812.481316] ? current_time+0x38/0x70 [68812.481317] file_update_time+0xbe/0x110 [68812.481319] filemap_page_mkwrite+0x41/0xb0 [68812.481322] do_page_mkwrite+0x31/0x90 [68812.481323] ? __do_fault+0x53/0x88 [68812.481325] __handle_mm_fault+0x772/0xed0 [68812.481327] handle_mm_fault+0xc6/0x1b0 [68812.481329] __do_page_fault+0x23f/0x4c0 [68812.481331] page_fault+0x25/0x50 [68812.481333] RIP: 0010:copy_user_generic_string+0x2c/0x40 [68812.481334] RSP: 0018:ffffb4b9837b3c48 EFLAGS: 00010206 [68812.481336] RAX: 00007f03dbfea164 RBX: 00000000000005a8 RCX: 0000000000000039 [68812.481337] RDX: 0000000000000005 RSI: ffff9e7f649ae7dd RDI: 00007f03dbfea000 [68812.481338] RBP: 0000000000000000 R08: 00000000000005a8 R09: ffff9e7df8c568c8 [68812.481338] R10: ffff9e7f649ae402 R11: 00007ffffffff000 R12: ffff9e7f649ae9aa [68812.481339] R13: ffffb4b9837b3e20 R14: ffffb4b9837b3e40 R15: 00000000000005a8 [68812.481342] ? __switch_to_asm+0x35/0x70 [68812.481344] copyout+0x22/0x30 [68812.481345] _copy_to_iter+0x8d/0x3f0 [68812.481347] ? __switch_to_asm+0x41/0x70 [68812.481349] ? __switch_to_asm+0x35/0x70 [68812.481350] ? __switch_to_asm+0x41/0x70 [68812.481351] ? __switch_to_asm+0x35/0x70 [68812.481353] ? __switch_to_asm+0x41/0x70 [68812.481354] ? __switch_to_asm+0x35/0x70 [68812.481355] ? __switch_to_asm+0x41/0x70 [68812.481358] skb_copy_datagram_iter+0x89/0x260 [68812.481360] tcp_recvmsg+0x6bb/0xa10 [68812.481362] ? ep_send_events_proc+0x19e/0x1f0 [68812.481363] ? ep_read_events_proc+0xe0/0xe0 [68812.481365] inet_recvmsg+0x50/0xc0 [68812.481367] SYSC_recvfrom+0xc3/0x130 [68812.481369] ? __audit_syscall_entry+0xae/0x100 [68812.481371] ? syscall_trace_enter+0x1ca/0x2d0 [68812.481372] ? __audit_syscall_exit+0x214/0x2a0 [68812.481374] do_syscall_64+0x6e/0x110 [68812.481376] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.481377] RIP: 0033:0x7f03e69b451f [68812.481378] RSP: 002b:00007fff9b8841b0 EFLAGS: 00000246 ORIG_RAX: 000000000000002d [68812.481379] RAX: ffffffffffffffda RBX: 000000000000009b RCX: 00007f03e69b451f [68812.481380] RDX: 0000000000001709 RSI: 00007f03dbfe9c25 RDI: 000000000000009b [68812.481381] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [68812.481382] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [68812.481383] R13: 0000000000001709 R14: 00007f03dbfe9c25 R15: 000055ec375e0300 [68812.481425] INFO: task kworker/3:4:19584 blocked for more than 480 seconds. [68812.481426] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.481427] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.481427] kworker/3:4 D 0 19584 2 0x80000080 [68812.481433] Workqueue: reiserfs/md7p1 flush_async_commits [reiserfs] [68812.481434] Call Trace: [68812.481436] __schedule+0x29e/0x6c0 [68812.481437] schedule+0x32/0x80 [68812.481439] schedule_preempt_disabled+0xa/0x10 [68812.481440] __mutex_lock.isra.1+0x26b/0x4e0 [68812.481442] ? __switch_to_asm+0x41/0x70 [68812.481443] ? __switch_to_asm+0x35/0x70 [68812.481445] ? __switch_to_asm+0x35/0x70 [68812.481446] ? __switch_to_asm+0x41/0x70 [68812.481450] ? flush_commit_list+0x1fa/0x670 [reiserfs] [68812.481454] flush_commit_list+0x1fa/0x670 [reiserfs] [68812.481468] flush_async_commits+0x41/0x50 [reiserfs] [68812.481470] process_one_work+0x171/0x390 [68812.481472] worker_thread+0x4d/0x3a0 [68812.481475] kthread+0xff/0x130 [68812.481476] ? process_one_work+0x390/0x390 [68812.481478] ? kthread_create_on_node+0x70/0x70 [68812.481480] ret_from_fork+0x22/0x40 [68812.481482] INFO: task kworker/3:1:21517 blocked for more than 480 seconds. [68812.481483] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.481484] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.481484] kworker/3:1 D 0 21517 2 0x80000080 [68812.481489] Workqueue: events_long flush_old_commits [reiserfs] [68812.481490] Call Trace: [68812.481492] __schedule+0x29e/0x6c0 [68812.481494] schedule+0x32/0x80 [68812.481501] raid5_make_request+0x1d3/0xb20 [raid456] [68812.481503] ? syscall_return_via_sysret+0x16/0x76 [68812.481505] ? __switch_to_asm+0x41/0x70 [68812.481507] ? __switch_to_asm+0x35/0x70 [68812.481509] ? remove_wait_queue+0x60/0x60 [68812.481510] ? __switch_to_asm+0x41/0x70 [68812.481512] ? __switch_to_asm+0x35/0x70 [68812.481513] ? __switch_to_asm+0x41/0x70 [68812.481515] ? __switch_to_asm+0x35/0x70 [68812.481518] md_handle_request+0x116/0x190 [68812.481520] md_make_request+0x65/0x160 [68812.481523] generic_make_request+0x123/0x2f0 [68812.481525] ? submit_bio+0x6c/0x130 [68812.481527] ? bio_alloc_bioset+0xcc/0x1d0 [68812.481529] submit_bio+0x6c/0x130 [68812.481530] ? guard_bio_eod+0x26/0xf0 [68812.481532] submit_bh_wbc+0x163/0x190 [68812.481537] write_ordered_buffers.isra.23+0x27c/0x3a0 [reiserfs] [68812.481540] ? radix_tree_lookup_slot+0x1e/0x50 [68812.481541] ? find_get_entry+0x21/0x180 [68812.481543] ? pagecache_get_page+0x184/0x320 [68812.481548] flush_commit_list+0x28a/0x670 [reiserfs] [68812.481553] do_journal_end+0xc82/0xda0 [reiserfs] [68812.481555] ? __switch_to_asm+0x35/0x70 [68812.481559] reiserfs_sync_fs+0x6b/0x80 [reiserfs] [68812.481564] flush_old_commits+0x5f/0x90 [reiserfs] [68812.481566] process_one_work+0x171/0x390 [68812.481568] worker_thread+0x4d/0x3a0 [68812.481570] kthread+0xff/0x130 [68812.481571] ? process_one_work+0x390/0x390 [68812.481573] ? kthread_create_on_node+0x70/0x70 [68812.481574] ret_from_fork+0x22/0x40 I have a 100% reproducible environment. I will be happy to help you debug. I know C. I don't have a shell script that can reproduce this. The steps I take are: 1: Start rtorrent with a large torrent to DL. 2: Let it run over night (Tests indicate that it will not hang the kernel during the day). Linux Phenom-II-x6 4.14.184-nopreempt-AMDGPU-dav9 #1 SMP Fri Jun 19 17:02:34 UTC 2020 x86_64 GNU/Linux GNU C 6.3.0 GNU Make 4.1 Binutils 2.28 Util-linux 2.29.2 Mount 2.29.2 Module-init-tools 23 E2fsprogs 1.43.4 Jfsutils 1.1.15 Reiserfsprogs 3.6.25 Xfsprogs 4.9.0 Quota-tools 4.03 PPP 2.4.7 Isdn4k-utils 3.25 Linux C Library 2.24 Dynamic linker (ldd) 2.24 Linux C++ Library 6.0.22 Procps 3.3.12 Net-tools 2.10 Kbd 2.0.3 Console-tools 2.0.3 Sh-utils 8.26 Udev 220 Wireless-tools 30 Modules Loaded ac97_bus async_memcpy async_pq async_raid6_recov async_tx async_xor bluetooth bnep button cdrom cpufreq_conservative cpufreq_ondemand cpufreq_powersave cpufreq_userspace crc_itu_t dm_crypt dm_mod ecdh_generic ehci_hcd ehci_pci firewire_core firewire_ohci fuse hid hid_generic hwmon_vid i2c_piix4 input_leds ip6_tables ip6table_filter ip_tables iptable_filter irqbypass it87 joydev k10temp kvm kvm_amd led_class lp mii ohci_pci parport parport_pc pcspkr ppdev r8169 raid0 raid456 raid6_pq reiserfs sata_promise serio_raw shpchp snd snd_ac97_codec snd_emu10k1 snd_emu10k1_synth snd_emux_synth snd_hda_codec snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_core snd_hda_intel snd_hwdep snd_mixer_oss snd_pcm snd_pcm_oss snd_rawmidi snd_seq snd_seq_device snd_seq_dummy snd_seq_midi snd_seq_midi_emul snd_seq_midi_event snd_seq_oss snd_seq_virmidi snd_timer snd_util_mem soundcore sp5100_tco sr_mod uinput usbhid x_tables xor processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 10 model name : AMD Phenom(tm) II X6 1090T Processor stepping : 0 microcode : 0x10000bf cpu MHz : 1879.281 cache size : 512 KB physical id : 0 siblings : 5 core id : 0 cpu cores : 5 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 bogomips : 6432.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb processor : 1 vendor_id : AuthenticAMD cpu family : 16 model : 10 model name : AMD Phenom(tm) II X6 1090T Processor stepping : 0 microcode : 0x10000bf cpu MHz : 2067.720 cache size : 512 KB physical id : 0 siblings : 5 core id : 1 cpu cores : 5 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 bogomips : 6432.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb processor : 2 vendor_id : AuthenticAMD cpu family : 16 model : 10 model name : AMD Phenom(tm) II X6 1090T Processor stepping : 0 microcode : 0x10000bf cpu MHz : 1515.344 cache size : 512 KB physical id : 0 siblings : 5 core id : 2 cpu cores : 5 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 bogomips : 6432.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb processor : 3 vendor_id : AuthenticAMD cpu family : 16 model : 10 model name : AMD Phenom(tm) II X6 1090T Processor stepping : 0 microcode : 0x10000bf cpu MHz : 1514.134 cache size : 512 KB physical id : 0 siblings : 5 core id : 3 cpu cores : 5 apicid : 3 initial apicid : 3 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 bogomips : 6432.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb processor : 4 vendor_id : AuthenticAMD cpu family : 16 model : 10 model name : AMD Phenom(tm) II X6 1090T Processor stepping : 0 microcode : 0x10000bf cpu MHz : 3089.003 cache size : 512 KB physical id : 0 siblings : 5 core id : 4 cpu cores : 5 apicid : 4 initial apicid : 4 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 bogomips : 6432.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb configs 65536 0 - Live 0xffffffffc0ba3000 fuse 122880 3 - Live 0xffffffffc08d8000 snd_emu10k1_synth 16384 0 - Live 0xffffffffc08d3000 snd_emux_synth 53248 1 snd_emu10k1_synth, Live 0xffffffffc08c5000 snd_seq_midi_emul 16384 1 snd_emux_synth, Live 0xffffffffc08c0000 snd_seq_virmidi 16384 1 snd_emux_synth, Live 0xffffffffc089b000 snd_seq_dummy 16384 0 - Live 0xffffffffc08bb000 snd_seq_midi 16384 0 - Live 0xffffffffc08a6000 snd_seq_oss 45056 0 - Live 0xffffffffc08af000 snd_seq_midi_event 16384 3 snd_seq_virmidi,snd_seq_midi,snd_seq_oss, Live 0xffffffffc0775000 snd_seq 81920 12 snd_emux_synth,snd_seq_midi_emul,snd_seq_virmidi,snd_seq_dummy,snd_seq_midi,snd_seq_oss,snd_seq_midi_event, Live 0xffffffffc0886000 ip6table_filter 16384 1 - Live 0xffffffffc0881000 ip6_tables 32768 1 ip6table_filter, Live 0xffffffffc0878000 iptable_filter 16384 1 - Live 0xffffffffc0867000 ip_tables 28672 1 iptable_filter, Live 0xffffffffc086d000 x_tables 45056 4 ip6table_filter,ip6_tables,iptable_filter,ip_tables, Live 0xffffffffc0851000 cpufreq_powersave 16384 0 - Live 0xffffffffc084c000 cpufreq_conservative 16384 0 - Live 0xffffffffc0847000 cpufreq_userspace 16384 0 - Live 0xffffffffc0842000 cpufreq_ondemand 16384 0 - Live 0xffffffffc0722000 bnep 24576 2 - Live 0xffffffffc0860000 bluetooth 602112 7 bnep, Live 0xffffffffc07ae000 ecdh_generic 24576 1 bluetooth, Live 0xffffffffc07a7000 uinput 20480 1 - Live 0xffffffffc076f000 it87 61440 0 - Live 0xffffffffc0797000 hwmon_vid 16384 1 it87, Live 0xffffffffc053e000 parport_pc 49152 0 - Live 0xffffffffc078a000 ppdev 20480 0 - Live 0xffffffffc070a000 lp 20480 0 - Live 0xffffffffc0710000 parport 57344 3 parport_pc,ppdev,lp, Live 0xffffffffc077b000 reiserfs 290816 1 - Live 0xffffffffc0727000 dm_crypt 40960 0 - Live 0xffffffffc0717000 dm_mod 143360 1 dm_crypt, Live 0xffffffffc06e6000 raid456 163840 1 - Live 0xffffffffc06bd000 async_raid6_recov 20480 1 raid456, Live 0xffffffffc06b7000 async_memcpy 16384 2 raid456,async_raid6_recov, Live 0xffffffffc0529000 async_pq 16384 2 raid456,async_raid6_recov, Live 0xffffffffc04df000 async_xor 16384 3 raid456,async_raid6_recov,async_pq, Live 0xffffffffc0455000 joydev 24576 0 - Live 0xffffffffc06b0000 xor 24576 1 async_xor, Live 0xffffffffc0667000 hid_generic 16384 0 - Live 0xffffffffc036d000 async_tx 16384 5 raid456,async_raid6_recov,async_memcpy,async_pq,async_xor, Live 0xffffffffc04c6000 usbhid 57344 0 - Live 0xffffffffc0658000 hid 126976 2 hid_generic,usbhid, Live 0xffffffffc0690000 raid6_pq 122880 3 raid456,async_raid6_recov,async_pq, Live 0xffffffffc0671000 sr_mod 28672 0 - Live 0xffffffffc04e5000 cdrom 65536 1 sr_mod, Live 0xffffffffc0647000 input_leds 16384 0 - Live 0xffffffffc0421000 led_class 16384 1 input_leds, Live 0xffffffffc03dc000 kvm_amd 94208 0 - Live 0xffffffffc062f000 snd_emu10k1 180224 1 snd_emu10k1_synth, Live 0xffffffffc09cb000 kvm 716800 1 kvm_amd, Live 0xffffffffc057f000 irqbypass 16384 1 kvm, Live 0xffffffffc03d7000 snd_util_mem 16384 2 snd_emux_synth,snd_emu10k1, Live 0xffffffffc03cd000 snd_ac97_codec 143360 1 snd_emu10k1, Live 0xffffffffc055b000 ac97_bus 16384 1 snd_ac97_codec, Live 0xffffffffc0392000 snd_hda_codec_realtek 110592 1 - Live 0xffffffffc050d000 snd_hda_codec_hdmi 57344 1 - Live 0xffffffffc04d0000 snd_rawmidi 40960 3 snd_seq_virmidi,snd_seq_midi,snd_emu10k1, Live 0xffffffffc0489000 snd_hda_codec_generic 86016 1 snd_hda_codec_realtek, Live 0xffffffffc04a2000 snd_seq_device 16384 7 snd_emu10k1_synth,snd_emux_synth,snd_seq_midi,snd_seq_oss,snd_seq,snd_emu10k1,snd_rawmidi, Live 0xffffffffc039f000 pcspkr 16384 0 - Live 0xffffffffc038d000 sata_promise 20480 0 - Live 0xffffffffc0367000 firewire_ohci 45056 0 - Live 0xffffffffc047d000 serio_raw 16384 0 - Live 0xffffffffc0383000 snd_hda_intel 40960 2 - Live 0xffffffffc03f9000 raid0 20480 4 - Live 0xffffffffc03c7000 firewire_core 81920 1 firewire_ohci, Live 0xffffffffc0468000 k10temp 16384 0 - Live 0xffffffffc0388000 crc_itu_t 16384 1 firewire_core, Live 0xffffffffc0362000 snd_hda_codec 151552 4 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel, Live 0xffffffffc042f000 snd_hda_core 94208 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_codec, Live 0xffffffffc0543000 r8169 94208 0 - Live 0xffffffffc03e1000 snd_hwdep 20480 3 snd_emux_synth,snd_emu10k1,snd_hda_codec, Live 0xffffffffc0399000 mii 16384 1 r8169, Live 0xffffffffc0373000 snd_pcm_oss 61440 0 - Live 0xffffffffc052e000 snd_mixer_oss 28672 1 snd_pcm_oss, Live 0xffffffffc037b000 snd_pcm 118784 8 snd_emu10k1,snd_ac97_codec,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core,snd_pcm_oss, Live 0xffffffffc04ef000 ohci_pci 16384 0 - Live 0xffffffffc04cb000 snd_timer 36864 3 snd_seq,snd_emu10k1,snd_pcm, Live 0xffffffffc04bc000 sp5100_tco 16384 0 - Live 0xffffffffc0496000 button 16384 0 - Live 0xffffffffc042a000 snd 98304 22 snd_emux_synth,snd_seq_virmidi,snd_seq_oss,snd_seq,snd_emu10k1,snd_ac97_codec,snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_rawmidi,snd_hda_codec_generic,snd_seq_device,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer, Live 0xffffffffc0408000 ehci_pci 16384 0 - Live 0xffffffffc03d2000 soundcore 16384 1 snd, Live 0xffffffffc049d000 shpchp 40960 0 - Live 0xffffffffc045d000 ehci_hcd 94208 1 ehci_pci, Live 0xffffffffc03af000 i2c_piix4 24576 0 - Live 0xffffffffc03a4000 0000-0000 : PCI Bus 0000:00 0000-0000 : dma1 0000-0000 : pic1 0000-0000 : timer0 0000-0000 : timer1 0000-0000 : keyboard 0000-0000 : PNP0800:00 0000-0000 : keyboard 0000-0000 : rtc0 0000-0000 : dma page reg 0000-0000 : pic2 0000-0000 : dma2 0000-0000 : PNP0C04:00 0000-0000 : fpu 0000-0000 : pnp 00:02 0000-0000 : pnp 00:02 0000-0000 : it87 0000-0000 : it87 0000-0000 : PCI Bus 0000:00 0000-0000 : vesafb 0000-0000 : PCI Bus 0000:00 0000-0000 : pnp 00:01 0000-0000 : pnp 00:05 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : ACPI PM1a_EVT_BLK 0000-0000 : ACPI PM1a_CNT_BLK 0000-0000 : ACPI PM_TMR 0000-0000 : ACPI CPU throttle 0000-0000 : ACPI GPE0_BLK 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:02 0000-0000 : piix4_smbus 0000-0000 : pnp 00:01 0000-0000 : piix4_smbus 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : pnp 00:01 0000-0000 : smba_idx 0000-0000 : pnp 00:01 0000-0000 : PCI conf1 0000-0000 : PCI Bus 0000:00 0000-0000 : PCI Bus 0000:05 0000-0000 : 0000:05:07.0 0000-0000 : 0000:05:07.0 0000-0000 : 0000:05:06.0 0000-0000 : EMU10K1 0000-0000 : PCI Bus 0000:04 0000-0000 : 0000:04:00.0 0000-0000 : ahci 0000-0000 : 0000:04:00.0 0000-0000 : ahci 0000-0000 : 0000:04:00.0 0000-0000 : ahci 0000-0000 : 0000:04:00.0 0000-0000 : ahci 0000-0000 : 0000:04:00.0 0000-0000 : ahci 0000-0000 : PCI Bus 0000:03 0000-0000 : 0000:03:00.0 0000-0000 : r8169 0000-0000 : PCI Bus 0000:01 0000-0000 : 0000:01:00.0 0000-0000 : 0000:00:11.0 0000-0000 : ahci 0000-0000 : 0000:00:11.0 0000-0000 : ahci 0000-0000 : 0000:00:11.0 0000-0000 : ahci 0000-0000 : 0000:00:11.0 0000-0000 : ahci 0000-0000 : 0000:00:11.0 0000-0000 : ahci 0000-0000 : pnp 00:01 00000000-00000000 : Reserved 00000000-00000000 : System RAM 00000000-00000000 : Reserved 00000000-00000000 : PCI Bus 0000:00 00000000-00000000 : PCI Bus 0000:00 00000000-00000000 : Video ROM 00000000-00000000 : Adapter ROM 00000000-00000000 : Reserved 00000000-00000000 : System ROM 00000000-00000000 : System RAM 00000000-00000000 : Reserved 00000000-00000000 : ACPI Tables 00000000-00000000 : ACPI Non-volatile Storage 00000000-00000000 : Reserved 00000000-00000000 : System RAM 00000000-00000000 : ACPI Non-volatile Storage 00000000-00000000 : System RAM 00000000-00000000 : Reserved 00000000-00000000 : System RAM 00000000-00000000 : RAM buffer 00000000-00000000 : PCI Bus 0000:00 00000000-00000000 : PCI Bus 0000:01 00000000-00000000 : 0000:01:00.0 00000000-00000000 : PCI Bus 0000:03 00000000-00000000 : 0000:03:00.0 00000000-00000000 : r8169 00000000-00000000 : PCI MMCONFIG 0000 [bus 00-ff] 00000000-00000000 : pnp 00:00 00000000-00000000 : Reserved 00000000-00000000 : PCI Bus 0000:05 00000000-00000000 : 0000:05:07.0 00000000-00000000 : 0000:05:07.0 00000000-00000000 : 0000:05:06.2 00000000-00000000 : 0000:05:07.0 00000000-00000000 : sata_promise 00000000-00000000 : 0000:05:06.2 00000000-00000000 : firewire_ohci 00000000-00000000 : PCI Bus 0000:04 00000000-00000000 : 0000:04:00.0 00000000-00000000 : 0000:04:00.0 00000000-00000000 : ahci 00000000-00000000 : PCI Bus 0000:03 00000000-00000000 : 0000:03:00.0 00000000-00000000 : r8169 00000000-00000000 : PCI Bus 0000:02 00000000-00000000 : 0000:02:00.0 00000000-00000000 : xhci-hcd 00000000-00000000 : PCI Bus 0000:01 00000000-00000000 : 0000:01:00.0 00000000-00000000 : 0000:01:00.1 00000000-00000000 : ICH HD audio 00000000-00000000 : 0000:00:14.2 00000000-00000000 : ICH HD audio 00000000-00000000 : 0000:00:16.2 00000000-00000000 : ehci_hcd 00000000-00000000 : 0000:00:16.0 00000000-00000000 : ohci_hcd 00000000-00000000 : 0000:00:14.5 00000000-00000000 : ohci_hcd 00000000-00000000 : 0000:00:13.2 00000000-00000000 : ehci_hcd 00000000-00000000 : 0000:00:13.0 00000000-00000000 : ohci_hcd 00000000-00000000 : 0000:00:12.2 00000000-00000000 : ehci_hcd 00000000-00000000 : 0000:00:12.0 00000000-00000000 : ohci_hcd 00000000-00000000 : 0000:00:11.0 00000000-00000000 : ahci 00000000-00000000 : pnp 00:07 00000000-00000000 : Reserved 00000000-00000000 : IOAPIC 0 00000000-00000000 : Reserved 00000000-00000000 : pnp 00:01 00000000-00000000 : Reserved 00000000-00000000 : IOAPIC 1 00000000-00000000 : Reserved 00000000-00000000 : HPET 0 00000000-00000000 : PNP0103:00 00000000-00000000 : Reserved 00000000-00000000 : pnp 00:01 00000000-00000000 : Reserved 00000000-00000000 : pnp 00:01 00000000-00000000 : Local APIC 00000000-00000000 : pnp 00:01 00000000-00000000 : Reserved 00000000-00000000 : pnp 00:01 00000000-00000000 : System RAM 00000000-00000000 : Kernel code 00000000-00000000 : Kernel data 00000000-00000000 : Kernel bss Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: Hitachi HUS72403 Rev: A5F0 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: Hitachi HUA72303 Rev: A840 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: WDC WD60EDAZ-11B Rev: 0A80 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: Hitachi HUA72302 Rev: A840 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi4 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: WDC WD60EDAZ-11B Rev: 0A80 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi5 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: ST2000DM001-1ER1 Rev: CC26 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi6 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: Hitachi HDS72202 Rev: A28A Type: Direct-Access ANSI SCSI revision: 05 Host: scsi7 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: ST2000DM001-1CH1 Rev: CC29 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi8 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: TOSHIBA DT01ABA2 Rev: ABB0 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi9 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: TOSHIBA DT01ABA2 Rev: ABB0 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi10 Channel: 00 Id: 00 Lun: 00 Vendor: HL-DT-ST Model: BD-RE WH14NS40 Rev: 1.02 Type: CD-ROM ANSI SCSI revision: 05 Host: scsi11 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: Hitachi HUS72403 Rev: A5F0 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi12 Channel: 00 Id: 00 Lun: 00 Vendor: HL-DT-ST Model: DVD-RAM GH22LP20 Rev: 1.04 Type: CD-ROM ANSI SCSI revision: 05 I'm in the process of upgrading my storage (backup, change HW, restore). This means that my environment will change (RAID5->RAID6) and possibly the bug will disappear or be hard to reproduce like it has been for over a year now. I would therefor ask that you don't ignore this/delay so that this long standing bug can be quashed. Again, I'm happy to help you hunt down this bug! Thanks, David
Created attachment 290637 [details] lspci
Most likely a reiserfs issue, please re-assign the bug. I'd also strongly reconsider using a filesystem that is actively maintained...
Thanks for your help! I will forward this to the reiserfs maintainer. I've managed to verify that all disks are accessible (smartctl -a /dev/sdX) and that the RAID array is working and accessible (mdadm --detail and echo-ing check/idle to the array and seeing progress).
On the suggestion to not use reiserfs: My interest in using reiserfs was so that I would have tail packing. I've searched online and can't find another FS with this function for Linux. The reason I need tail packing is because I keep a bunch of mostly git repositories on my system. These contain a lot of files that are either small or are empty. I could try to hardlink all the empty files and small duplicate files, but git would complain. I could compress the source code like I do with normal code bases, but then I'd need to decompress and update them all. Writing a script to do that would be nothing, it's just the time involved compressing/decompressing that would be a waist (which is saying nothing compared to git's love for full histories instead of up-to-the-last-4-versions or something).
I should add that in chasing down this bug I have tried all the IO schedulers available (noop deadline and cfq). Cfq is the one I'm now using to reproduce this. Also, I don't know if it makes a difference, but when the system first starts up it takes 20m to get from the login manager to having my web browsers restart and get all their pages from online. It might be because there is a lot of IO going on or it might be that there are several stalls in the scheduling; just not bad enough to cause a hung task problem like above.
This bug appears to have been fixed some where between 4.14.X and the 5.17.X series. I don't know why the fix wasn't backported, but it doesn't really matter to me as I can run the newer kernel.