On Wed, 2018-02-07 at 17:55 +1100, Dave Chinner wrote: > On Wed, Feb 07, 2018 at 08:40:45AM +0500, mikhail wrote: > > On Tue, 2018-02-06 at 12:12 +0500, Mikhail Gavrilov wrote: > > > On 6 February 2018 at 11:08, Dave Chinner <david@xxxxxxxxxxxxx> wrote: > > > > Yet another hung: > > Trace report: https://dumps.sy24.ru/1/trace_report.txt.bz2 (9.4 MB) > > dmesg: > > [ 369.374381] INFO: task TaskSchedulerFo:5624 blocked for more than 120 seconds. > > [ 369.374391] Not tainted 4.15.0-rc4-amd-vega+ #9 > > [ 369.374393] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > [ 369.374395] TaskSchedulerFo D11688 5624 3825 0x00000000 > > [ 369.374400] Call Trace: > > [ 369.374407] __schedule+0x2dc/0xba0 > > [ 369.374410] ? __lock_acquire+0x2d4/0x1350 > > [ 369.374415] ? __down+0x84/0x110 > > [ 369.374417] schedule+0x33/0x90 > > [ 369.374419] schedule_timeout+0x25a/0x5b0 > > [ 369.374423] ? mark_held_locks+0x5f/0x90 > > [ 369.374425] ? _raw_spin_unlock_irq+0x2c/0x40 > > [ 369.374426] ? __down+0x84/0x110 > > [ 369.374429] ? trace_hardirqs_on_caller+0xf4/0x190 > > [ 369.374431] ? __down+0x84/0x110 > > [ 369.374433] __down+0xac/0x110 > > [ 369.374466] ? _xfs_buf_find+0x263/0xac0 [xfs] > > [ 369.374470] down+0x41/0x50 > > [ 369.374472] ? down+0x41/0x50 > > [ 369.374490] xfs_buf_lock+0x4e/0x270 [xfs] > > [ 369.374507] _xfs_buf_find+0x263/0xac0 [xfs] > > [ 369.374528] xfs_buf_get_map+0x29/0x490 [xfs] > > [ 369.374545] xfs_buf_read_map+0x2b/0x300 [xfs] > > [ 369.374567] xfs_trans_read_buf_map+0xc4/0x5d0 [xfs] > > [ 369.374585] xfs_read_agi+0xaa/0x200 [xfs] > > [ 369.374605] xfs_iunlink+0x4d/0x150 [xfs] > > [ 369.374609] ? current_time+0x32/0x70 > > [ 369.374629] xfs_droplink+0x54/0x60 [xfs] > > [ 369.374654] xfs_rename+0xb15/0xd10 [xfs] > > [ 369.374680] xfs_vn_rename+0xd3/0x140 [xfs] > > [ 369.374687] vfs_rename+0x476/0x960 > > [ 369.374695] SyS_rename+0x33f/0x390 > > [ 369.374704] entry_SYSCALL_64_fastpath+0x1f/0x96 > > Again, this is waiting on a lock.... > > > [ 369.374707] RIP: 0033:0x7f01cf705137 > > [ 369.374708] RSP: 002b:00007f01873e5608 EFLAGS: 00000202 ORIG_RAX: 0000000000000052 > > [ 369.374710] RAX: ffffffffffffffda RBX: 0000000000000119 RCX: 00007f01cf705137 > > [ 369.374711] RDX: 00007f01873e56dc RSI: 00003a5cd3540850 RDI: 00003a5cd7ea8000 > > [ 369.374713] RBP: 00007f01873e6340 R08: 0000000000000000 R09: 00007f01873e54e0 > > [ 369.374714] R10: 00007f01873e55f0 R11: 0000000000000202 R12: 00007f01873e6218 > > [ 369.374715] R13: 00007f01873e6358 R14: 0000000000000000 R15: 00003a5cd8416000 > > [ 369.374725] INFO: task disk_cache:0:3971 blocked for more than 120 seconds. > > [ 369.374727] Not tainted 4.15.0-rc4-amd-vega+ #9 > > [ 369.374729] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > [ 369.374731] disk_cache:0 D12432 3971 3903 0x00000000 > > [ 369.374735] Call Trace: > > [ 369.374738] __schedule+0x2dc/0xba0 > > [ 369.374743] ? wait_for_completion+0x10e/0x1a0 > > [ 369.374745] schedule+0x33/0x90 > > [ 369.374747] schedule_timeout+0x25a/0x5b0 > > [ 369.374751] ? mark_held_locks+0x5f/0x90 > > [ 369.374753] ? _raw_spin_unlock_irq+0x2c/0x40 > > [ 369.374755] ? wait_for_completion+0x10e/0x1a0 > > [ 369.374757] ? trace_hardirqs_on_caller+0xf4/0x190 > > [ 369.374760] ? wait_for_completion+0x10e/0x1a0 > > [ 369.374762] wait_for_completion+0x136/0x1a0 > > [ 369.374765] ? wake_up_q+0x80/0x80 > > [ 369.374782] ? _xfs_buf_read+0x23/0x30 [xfs] > > [ 369.374798] xfs_buf_submit_wait+0xb2/0x530 [xfs] > > [ 369.374814] _xfs_buf_read+0x23/0x30 [xfs] > > [ 369.374828] xfs_buf_read_map+0x14b/0x300 [xfs] > > [ 369.374847] ? xfs_trans_read_buf_map+0xc4/0x5d0 [xfs] > > [ 369.374867] xfs_trans_read_buf_map+0xc4/0x5d0 [xfs] > > [ 369.374883] xfs_da_read_buf+0xca/0x110 [xfs] > > [ 369.374901] xfs_dir3_data_read+0x23/0x60 [xfs] > > [ 369.374916] xfs_dir2_leaf_addname+0x335/0x8b0 [xfs] > > [ 369.374936] xfs_dir_createname+0x17e/0x1d0 [xfs] > > [ 369.374956] xfs_create+0x6ad/0x840 [xfs] > > [ 369.374981] xfs_generic_create+0x1fa/0x2d0 [xfs] > > [ 369.375000] xfs_vn_mknod+0x14/0x20 [xfs] > > [ 369.375016] xfs_vn_create+0x13/0x20 [xfs] > > That is held by this process, one it is waiting for IO completion. > > There's nothing in the traces relating to this IO, because the trace > only starts at 270s after boot, and this process has been waiting > since submitting it's IO at 250s after boot. The traces tell me that > IO is still running, but it only takes on IO to go missing for > everything to have problems. > This is happens because in manual http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F was proposed first enter "# echo w > /proc/sysrq-trigger" and then "trace-cmd record -e xfs\*" And first waiting on a lock always registered after entering "# echo w > /proc/sysrq-trigger" command. Would be more correct if first was proposed to type "trace-cmd record -e xfs \ *", and then "# echo w> / proc / sysrq- trigger". The result is a new trace in which is nothing missed: https://dumps.sy24.ru/5/trace_report.txt.bz2 (278 MB) > And there's a lot more threads all waiting on IO completion, both > data or metadata, so I'm not going to bother commenting further > because filesystems don't hang like this by themselves. > > i.e. This has all the hallmarks of something below the filesystem > dropping IO completions, such as the hardware being broken. The > filesystem is just the messenger.... > smartctl was said that my HDD is healthy:# smartctl --all /dev/sdb smartctl 6.5 2016-05-07 r4318 [x86_64-linux-4.15.0-rc4-amd-vega+] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Seagate Constellation ES.3 Device Model: ST4000NM0033-9ZM170 Serial Number: Z1Z92B7W LU WWN Device Id: 5 000c50 07bbbecba Firmware Version: SN06 User Capacity: 4,000,787,030,016 bytes [4.00 TB] Sector Size: 512 bytes logical/physical Rotation Rate: 7200 rpm Form Factor: 3.5 inches Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-2 (minor revision not indicated) SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Sat Feb 10 13:54:04 2018 +05 SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED See vendor-specific Attribute list for marginal Attributes. General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 584) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 1) minutes. Extended self-test routine recommended polling time: ( 479) minutes. Conveyance self-test routine recommended polling time: ( 2) minutes. SCT capabilities: (0x50bd) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 076 063 044 Pre-fail Always - 48212827 3 Spin_Up_Time 0x0003 092 092 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 72 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 77 7 Seek_Error_Rate 0x000f 093 060 030 Pre-fail Always - 2572806334 9 Power_On_Hours 0x0032 079 079 000 Old_age Always - 18915 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 70 184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 188 Command_Timeout 0x0032 100 099 000 Old_age Always - 65538 189 High_Fly_Writes 0x003a 059 059 000 Old_age Always - 41 190 Airflow_Temperature_Cel 0x0022 050 045 045 Old_age Always In_the_past 50 (Min/Max 44/54) 191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 41 193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 861 194 Temperature_Celsius 0x0022 050 055 000 Old_age Always - 50 (0 25 0 0 0) 195 Hardware_ECC_Recovered 0x001a 038 015 000 Old_age Always - 48212827 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Conveyance offline Completed without error 00% 13431 - # 2 Conveyance offline Completed without error 00% 12505 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. Can you help me move in right direction? I am understand that file system is not root cause here of locking. But I am still wonder to know who was guilty here. Which subsystem is behind file system? Maybe you can suggest right mailing list for discussion this issue? Thanks. -- Best Regards, Mikhail Gavrilov. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
