linux-ext4 - [Bug 203247] New: jbd2 gets stuck at jbd2_journal_commit

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Date:   Wed, 10 Apr 2019 16:15:14 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 203247] New: jbd2 gets stuck at jbd2_journal_commit_transaction
 frequently

https://bugzilla.kernel.org/show_bug.cgi?id=203247

            Bug ID: 203247
           Summary: jbd2 gets stuck at jbd2_journal_commit_transaction
                    frequently
           Product: File System
           Version: 2.5
    Kernel Version: 4.9.86
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext3
          Assignee: fs_ext3@...nel-bugs.osdl.org
          Reporter: pankajcabs@...il.com
        Regression: No

Created attachment 282263
  --> https://bugzilla.kernel.org/attachment.cgi?id=282263&action=edit
dmesg file

I am noticing jbd2 getting blocked on commit_transaction causing processes to
go in D state for good amount of time, it comes out of that state
automatically. I am dumping the sysrq-w and sysrq-l 

Apr 10 15:47:23 ex-etp3 kernel:sysrq: SysRq : Show Blocked State
Apr 10 15:47:23 ex-etp3 kernel:  task                        PC stack   pid
father
Apr 10 15:47:23 ex-etp3 kernel:jbd2/sda10-8    D    0  2573      2 0x00000000
Apr 10 15:47:23 ex-etp3 kernel: ffff8818347c97c0 0000000000000000
ffff88101c9d0140 ffff8817ff898080
Apr 10 15:47:23 ex-etp3 kernel: ffff88101fd17e40 ffff8817fec47b38
ffffffff816bcf06 ffff8807ff66b040
Apr 10 15:47:23 ex-etp3 kernel: ffff8817ff898080 7fffffffffffffff
ffffffff81c06930 ffffffff816bdae0
Apr 10 15:47:23 ex-etp3 kernel:Call Trace:
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bcf06>] ? __schedule+0x1b6/0x570
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bdae0>] ? bit_wait+0x50/0x50
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bd2f4>] ? schedule+0x34/0x80
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bfd25>] ?
schedule_timeout+0x165/0x290
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81264366>] ?
generic_make_request+0x116/0x290
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bdae0>] ? bit_wait+0x50/0x50
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bcce9>] ?
io_schedule_timeout+0x99/0x100
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bdaf2>] ? bit_wait_io+0x12/0x60
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bd725>] ? __wait_on_bit+0x55/0x80
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bdae0>] ? bit_wait+0x50/0x50
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816bd919>] ?
out_of_line_wait_on_bit+0x79/0xa0
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff8109d970>] ?
autoremove_wake_function+0x30/0x30
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff8122301f>] ?
jbd2_journal_commit_transaction+0x198f/0x1b00
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81085b41>] ?
finish_task_switch+0x81/0x1f0
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81226150>] ? kjournald2+0xc0/0x260
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff8109d940>] ? wake_up_bit+0x20/0x20
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81226090>] ? commit_timeout+0x10/0x10
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81080922>] ? kthread+0xd2/0xf0
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816c5645>] ? __clear_rsb+0x25/0x3d
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81080850>] ? kthread_park+0x50/0x50
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff81068beb>] ? SyS_exit_group+0xb/0x10
Apr 10 15:47:23 ex-etp3 kernel: [<ffffffff816c0ff4>] ? ret_from_fork+0x44/0x70

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