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Date: Tue, 12 Jan 2010 20:44:14 +0100 From: Jan Kara <jack@...e.cz> To: Marko Weber <weber@...kbummfertig.de> Cc: ext4 <linux-ext4@...r.kernel.org> Subject: Re: ext4 crash? on rsyn action Hi, Thanks for the report. > i had an crash on moving data with rsync on my system. > from system hdd (xfs) i moved with rsync data to my raid5 array (ext4). > nearly at end of rsync the opration hang. > i dont know if this is a crash. It's not a crash but it might be a deadlock. But from the traces it's not quite clear. There is just task jbd2/md0-8 waiting in jbd2_journal_commit_transaction. Other tasks (spindownd and rsync) are just waiting for commit to finish. If you can send your vmlinux file, we can find out where exactly in jbd2_journal_commit_transaction we wait. If we wait for IO, everything is fine and we should eventually resume. If we wait for someone to drop handle to a transaction, it's probably a deadlock... Honza > used kernel on the system 2.6.32.3 > > in /var/log/messages i found this = > > Jan 11 19:38:51 zagreb kernel: INFO: task jbd2/md0-8:5435 blocked for > more than 120 seconds. > Jan 11 19:38:51 zagreb kernel: "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Jan 11 19:38:51 zagreb kernel: jbd2/md0-8 D ffff88022e3f7d80 0 > 5435 2 0x00000000 > Jan 11 19:38:51 zagreb kernel: ffff88022f87a870 0000000000000046 > 0000000000000000 ffff88022bc43e24 > Jan 11 19:38:51 zagreb kernel: 000000022bc43cb0 ffff88022bc43e10 > 000000000000e2e0 ffff88022bc43fd8 > Jan 11 19:38:51 zagreb kernel: 0000000000012000 ffff88022bc43fd8 > 0000000000012000 ffff88022fad4140 > Jan 11 19:38:51 zagreb kernel: Call Trace: > Jan 11 19:38:51 zagreb kernel: [<ffffffff81026fd0>] ? __switch_to+0xd0/0x297 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8114d0fe>] ? > jbd2_journal_commit_transaction+0x17d/0xf9f > Jan 11 19:38:51 zagreb kernel: [<ffffffff8105676f>] ? > finish_task_switch+0x3a/0xb4 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d5fd>] ? > autoremove_wake_function+0x0/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff810641e5>] ? > lock_timer_base+0x26/0x4b > Jan 11 19:38:51 zagreb kernel: [<ffffffff81064274>] ? > try_to_del_timer_sync+0x6a/0x73 > Jan 11 19:38:51 zagreb kernel: [<ffffffff81150ea2>] ? kjournald2+0xbd/0x1dd > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d5fd>] ? > autoremove_wake_function+0x0/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff81150de5>] ? kjournald2+0x0/0x1dd > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d38f>] ? kthread+0x79/0x81 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8102942a>] ? child_rip+0xa/0x20 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d316>] ? kthread+0x0/0x81 > Jan 11 19:38:51 zagreb kernel: [<ffffffff81029420>] ? child_rip+0x0/0x20 > Jan 11 19:38:51 zagreb kernel: INFO: task spindownd:9924 blocked for > more than 120 seconds. > Jan 11 19:38:51 zagreb kernel: "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Jan 11 19:38:51 zagreb kernel: spindownd D ffff880224e01e80 0 > 9924 1 0x00000000 > Jan 11 19:38:51 zagreb kernel: ffffffff816828a0 0000000000000082 > 0000000000000000 ffff88022e6fd000 > Jan 11 19:38:51 zagreb kernel: 0000000000000292 ffff88022bc52f28 > 000000000000e2e0 ffff880224e01fd8 > Jan 11 19:38:51 zagreb kernel: 0000000000012000 ffff880224e01fd8 > 0000000000012000 ffff88022e2c9830 > Jan 11 19:38:51 zagreb kernel: Call Trace: > Jan 11 19:38:51 zagreb kernel: [<ffffffff811508ae>] ? > jbd2_log_wait_commit+0xbe/0x110 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d5fd>] ? > autoremove_wake_function+0x0/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff8112f32e>] ? ext4_sync_fs+0x44/0x4d > Jan 11 19:38:51 zagreb kernel: [<ffffffff810fcaa1>] ? > sync_quota_sb+0x45/0xf6 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810d952a>] ? > __sync_filesystem+0x43/0x70 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810d95f0>] ? > sync_filesystems+0x99/0xe1 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810d967d>] ? sys_sync+0x1c/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff81028442>] ? > system_call_fastpath+0x16/0x1b > Jan 11 19:38:51 zagreb kernel: INFO: task rsync:23457 blocked for more > than 120 seconds. > Jan 11 19:38:51 zagreb kernel: "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Jan 11 19:38:51 zagreb kernel: rsync D ffff88022faa3824 0 > 23457 1 0x00000004 > Jan 11 19:38:51 zagreb kernel: ffff88022f8a67b0 0000000000000082 > 0000000000000000 0000000000000001 > Jan 11 19:38:51 zagreb kernel: 0000000063400074 0000000000000001 > 000000000000e2e0 ffff880207cb5fd8 > Jan 11 19:38:51 zagreb kernel: 0000000000012000 ffff880207cb5fd8 > 0000000000012000 ffff8801de07d100 > Jan 11 19:38:51 zagreb kernel: Call Trace: > Jan 11 19:38:51 zagreb kernel: [<ffffffff81139da9>] ? > __ext4_handle_dirty_metadata+0xc9/0xd4 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8114cb5c>] ? > start_this_handle+0x2d9/0x3a1 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d5fd>] ? > autoremove_wake_function+0x0/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff8114cd82>] ? > jbd2_journal_start+0x96/0xc6 > Jan 11 19:38:51 zagreb kernel: [<ffffffff81129c48>] ? > ext4_da_write_begin+0xe2/0x1ed > Jan 11 19:38:51 zagreb kernel: [<ffffffff81095953>] ? > generic_file_buffered_write+0x118/0x278 > Jan 11 19:38:51 zagreb kernel: [<ffffffff81095f45>] ? > __generic_file_aio_write+0x340/0x374 > Jan 11 19:38:51 zagreb kernel: [<ffffffff813eec37>] ? > sock_aio_read+0x109/0x11d > Jan 11 19:38:51 zagreb kernel: [<ffffffff81095fd2>] ? > generic_file_aio_write+0x59/0x9f > Jan 11 19:38:51 zagreb kernel: [<ffffffff810bc2f6>] ? > do_sync_write+0xce/0x113 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810270ad>] ? > __switch_to+0x1ad/0x297 > Jan 11 19:38:51 zagreb kernel: [<ffffffff8106d5fd>] ? > autoremove_wake_function+0x0/0x2e > Jan 11 19:38:51 zagreb kernel: [<ffffffff810732a2>] ? ktime_get_ts+0x68/0xb2 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810c931a>] ? > poll_select_copy_remaining+0xd0/0xf3 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810bcc05>] ? vfs_write+0xad/0x149 > Jan 11 19:38:51 zagreb kernel: [<ffffffff810bcd5d>] ? sys_write+0x45/0x6e > Jan 11 19:38:51 zagreb kernel: [<ffffffff81028442>] ? > system_call_fastpath+0x16/0x1b > Jan 11 19:39:01 zagreb cron[23909]: (root) CMD > (/usr/local/mrourmon/bin/omupdate.sh) > Jan 11 19:39:47 zagreb su[24028]: Successful su for root by weber > Jan 11 19:39:47 zagreb su[24028]: + pts/4 weber:root > Jan 11 19:39:47 zagreb su[24028]: pam_unix(su:session): session opened > for user root by weber(uid=1000) > Jan 11 19:40:01 zagreb cron[24042]: (root) CMD > (/usr/local/mrourmon/bin/omupdate.sh) > Jan 11 19:40:01 zagreb cron[24043]: (root) CMD (test -x > /usr/sbin/run-crons && /usr/sbin/run-crons ) > Jan 11 19:40:48 zagreb su[22526]: pam_unix(su:session): session closed > for user root > Jan 11 19:40:51 zagreb kernel: INFO: task shutdown:23846 blocked for > more than 120 seconds. > Jan 11 19:40:51 zagreb kernel: "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Jan 11 19:40:51 zagreb kernel: shutdown D ffffffffffffffff 0 > 23846 23580 0x00000000 > Jan 11 19:40:51 zagreb kernel: ffff880224d0d040 0000000000000086 > 0000000000012000 ffff8801f2e67a80 > Jan 11 19:40:51 zagreb kernel: 0000000000000000 ffff8801f2e67a80 > 000000000000e2e0 ffff88010000bfd8 > Jan 11 19:40:51 zagreb kernel: 0000000000012000 ffff88010000bfd8 > 0000000000012000 ffff8802291a40c0 > Jan 11 19:40:51 zagreb kernel: Call Trace: > Jan 11 19:40:51 zagreb kernel: [<ffffffff8104edfc>] ? > check_preempt_wakeup+0x186/0x215 > Jan 11 19:40:51 zagreb kernel: [<ffffffff814aa198>] ? > __mutex_lock_slowpath+0xd6/0x121 > Jan 11 19:40:51 zagreb kernel: [<ffffffff814aa041>] ? mutex_lock+0x12/0x28 > Jan 11 19:40:51 zagreb kernel: [<ffffffff810d956a>] ? > sync_filesystems+0x13/0xe1 > Jan 11 19:40:51 zagreb kernel: [<ffffffff810d9673>] ? sys_sync+0x12/0x2e > Jan 11 19:40:51 zagreb kernel: [<ffffffff81028442>] ? > system_call_fastpath+0x16/0x1b > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Jan Kara <jack@...e.cz> SuSE CR Labs -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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