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SubjectNew tty ldisc lockup on 3.5-rc3
From
Date
Hi all,

I'm seeing the following when fuzzing using trinity inside a KVM tools guest on 3.5-rc3:

[ 60.361427] tty_ldisc_hangup: waiting (trinity-child1) for ttyS0 took too long, but we keep waiting...
[ 242.690529] INFO: task trinity-watchdo:5872 blocked for more than 120 seconds.
[ 242.693495] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.696567] trinity-watchdo D 000000000000001a 6016 5872 5844 0x00000000
[ 242.697640] ffff88000a079df8 0000000000000046 ffffffff83698795 00007fad79ce7000
[ 242.699148] ffff88000a078000 ffff88000a078010 ffff88000a079fd8 ffff88000a078000
[ 242.700128] ffff88000a078010 ffff88000a079fd8 ffff88000d5c0000 ffff88000be33000
[ 242.701082] Call Trace:
[ 242.701403] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.702289] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.702921] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.703685] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.704484] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.705202] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.705867] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.706654] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.707439] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.708112] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.708764] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.709554] no locks held by trinity-watchdo/5872.
[ 242.710200] INFO: task trinity-child1:5881 blocked for more than 120 seconds.
[ 242.711877] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.714508] trinity-child1 D ffff88001949be58 5472 5881 5873 0x00000004
[ 242.716891] ffff88001949bce8 0000000000000046 0000000000000000 0000000000000001
[ 242.719381] ffff88001949a000 ffff88001949a010 ffff88001949bfd8 ffff88001949a000
[ 242.721894] ffff88001949a010 ffff88001949bfd8 ffff88000d5b8000 ffff88001b578000
[ 242.724336] Call Trace:
[ 242.725147] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.726861] [<ffffffff8369462a>] schedule_timeout+0x3a/0x400
[ 242.728772] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.731031] [<ffffffff8114d74d>] ? trace_hardirqs_on+0xd/0x10
[ 242.732916] [<ffffffff836987c4>] ? _raw_spin_unlock_irqrestore+0x94/0xc0
[ 242.735143] [<ffffffff81107d52>] ? prepare_to_wait+0x72/0x80
[ 242.737060] [<ffffffff81b29c50>] tty_ldisc_wait_idle+0x80/0xd0
[ 242.738867] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.740654] [<ffffffff81b29e63>] tty_ldisc_hangup+0x1c3/0x310
[ 242.742486] [<ffffffff8114f29a>] ? __lock_release+0x1ba/0x1d0
[ 242.744336] [<ffffffff81b22c82>] ? __tty_hangup+0x122/0x400
[ 242.746091] [<ffffffff81b22c8a>] __tty_hangup+0x12a/0x400
[ 242.747883] [<ffffffff836987c4>] ? _raw_spin_unlock_irqrestore+0x94/0xc0
[ 242.750101] [<ffffffff81b22fae>] tty_vhangup_self+0x1e/0x30
[ 242.751992] [<ffffffff81233390>] sys_vhangup+0x20/0x30
[ 242.753757] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.755777] 1 lock held by trinity-child1/5881:
[ 242.757296] #0: (&tty->ldisc_mutex){+.+...}, at: [<ffffffff81b29dbf>] tty_ldisc_hangup+0x11f/0x310
[ 242.760256] INFO: task trinity-child2:5882 blocked for more than 120 seconds.
[ 242.762581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.765060] trinity-child2 D 0000000000000029 5472 5882 5873 0x00000000
[ 242.767294] ffff8800283a1df8 0000000000000046 ffffffff83698795 00007fad79ce7000
[ 242.769394] ffff8800283a0000 ffff8800283a0010 ffff8800283a1fd8 ffff8800283a0000
[ 242.771649] ffff8800283a0010 ffff8800283a1fd8 ffff88000cf80000 ffff88002833b000
[ 242.773901] Call Trace:
[ 242.774668] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.776815] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.779035] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.780900] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.782866] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.784512] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.786098] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.787971] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.789915] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.791566] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.793199] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.795122] no locks held by trinity-child2/5882.
[ 242.796617] INFO: task trinity-child3:5883 blocked for more than 120 seconds.
[ 242.798844] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.801274] trinity-child3 D 0000000000000029 5472 5883 5873 0x00000000
[ 242.803471] ffff8800276dddf8 0000000000000046 ffffffff83698795 00007fad79ce7000
[ 242.805797] ffff8800276dc000 ffff8800276dc010 ffff8800276ddfd8 ffff8800276dc000
[ 242.808065] ffff8800276dc010 ffff8800276ddfd8 ffff88000cf68000 ffff8800283f8000
[ 242.810339] Call Trace:
[ 242.811131] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.813291] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.814801] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.816636] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.818613] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.820370] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.822033] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.823885] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.825839] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.827418] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.829027] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.830905] no locks held by trinity-child3/5883.
[ 242.832385] INFO: task trinity-child0:5884 blocked for more than 120 seconds.
[ 242.834995] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.837596] trinity-child0 D ffff8800283dd4c0 5472 5884 5873 0x00000000
[ 242.839973] ffff8800276fddf8 0000000000000046 ffffffff83698795 00007fad79ce7000
[ 242.842401] ffff8800276fc000 ffff8800276fc010 ffff8800276fdfd8 ffff8800276fc000
[ 242.844698] ffff8800276fc010 ffff8800276fdfd8 ffff88000be2b000 ffff880027700000
[ 242.847072] Call Trace:
[ 242.847897] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.850167] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.851878] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.853664] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.855573] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.857390] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.859135] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.861128] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.863046] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.863050] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.863054] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.875268] no locks held by trinity-child0/5884.
[ 242.876897] INFO: task trinity:5885 blocked for more than 120 seconds.
[ 242.879055] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.881625] trinity D 0000000000000019 6272 5885 5870 0x00000000
[ 242.884195] ffff880027729df8 0000000000000046 ffffffff83698795 00007f408df16000
[ 242.886714] ffff880027728000 ffff880027728010 ffff880027729fd8 ffff880027728000
[ 242.889129] ffff880027728010 ffff880027729fd8 ffff88000d5c0000 ffff880027703000
[ 242.891481] Call Trace:
[ 242.892258] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.894477] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.896084] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.897935] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.900250] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.902019] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.903610] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.905487] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.907485] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.909209] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.910894] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.924276] no locks held by trinity/5885.
[ 242.925716] INFO: task trinity-main:5886 blocked for more than 120 seconds.
[ 242.927986] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.930560] trinity-main D 0000000000000024 6176 5886 5870 0x00000000
[ 242.932901] ffff880027759df8 0000000000000046 ffffffff83698795 00007f408df16000
[ 242.935298] ffff880027758000 ffff880027758010 ffff880027759fd8 ffff880027758000
[ 242.937726] ffff880027758010 ffff880027759fd8 ffff88000d5bb000 ffff880027750000
[ 242.939999] Call Trace:
[ 242.940800] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.942899] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.944442] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.946323] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.948378] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.950186] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.951803] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.953490] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.955215] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.956636] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.958094] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.959763] no locks held by trinity-main/5886.
[ 242.960978] INFO: task trinity:5887 blocked for more than 120 seconds.
[ 242.962737] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.964793] trinity D 0000000000000019 6176 5887 5862 0x00000000
[ 242.966724] ffff88000a13bdf8 0000000000000046 ffffffff83698795 00007f1eb1681000
[ 242.968765] ffff88000a13a000 ffff88000a13a010 ffff88000a13bfd8 ffff88000a13a000
[ 242.970809] ffff88000a13a010 ffff88000a13bfd8 ffff88000d5b8000 ffff88000be18000
[ 242.972830] Call Trace:
[ 242.973529] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 242.975395] [<ffffffff83696d15>] schedule+0x55/0x60
[ 242.976799] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 242.978389] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 242.980083] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 242.981556] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 242.982984] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 242.984602] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 242.986262] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 242.987649] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 242.989059] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 242.990694] no locks held by trinity/5887.
[ 242.991849] INFO: task trinity-main:5888 blocked for more than 120 seconds.
[ 242.993959] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.996099] trinity-main D 0000000000000024 6224 5888 5862 0x00000000
[ 242.997984] ffff88000a155df8 0000000000000046 ffffffff83698795 00007f1eb1681000
[ 242.999936] ffff88000a154000 ffff88000a154010 ffff88000a155fd8 ffff88000a154000
[ 243.001902] ffff88000a154010 ffff88000a155fd8 ffff88000d5b8000 ffff88000a158000
[ 243.004305] Call Trace:
[ 243.005032] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 243.006916] [<ffffffff83696d15>] schedule+0x55/0x60
[ 243.008298] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 243.009916] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 243.011581] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 243.013070] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 243.014466] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 243.016157] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 243.017808] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 243.019212] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 243.020590] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 243.022231] no locks held by trinity-main/5888.
[ 243.023472] INFO: task trinity:5889 blocked for more than 120 seconds.
[ 243.025221] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 243.027293] trinity D 0000000000000019 6272 5889 5859 0x00000000
[ 243.029152] ffff880027789df8 0000000000000046 ffffffff83698795 00007f9af2075000
[ 243.031095] ffff880027788000 ffff880027788010 ffff880027789fd8 ffff880027788000
[ 243.033041] ffff880027788010 ffff880027789fd8 ffffffff8482d400 ffff880027753000
[ 243.035040] Call Trace:
[ 243.035763] [<ffffffff83698795>] ? _raw_spin_unlock_irqrestore+0x65/0xc0
[ 243.037603] [<ffffffff83696d15>] schedule+0x55/0x60
[ 243.039248] [<ffffffff81b2a026>] tty_ldisc_ref_wait+0x76/0xa0
[ 243.040911] [<ffffffff81b22624>] ? redirected_tty_write+0x84/0xc0
[ 243.042603] [<ffffffff81107a50>] ? wake_up_bit+0x40/0x40
[ 243.044118] [<ffffffff81b22539>] tty_write+0x99/0x100
[ 243.045540] [<ffffffff8197fc10>] ? do_raw_spin_unlock+0xd0/0xe0
[ 243.047209] [<ffffffff81b22635>] redirected_tty_write+0x95/0xc0
[ 243.048830] [<ffffffff81235b1a>] vfs_write+0xca/0x190
[ 243.050258] [<ffffffff81235cbf>] sys_write+0x4f/0x90
[ 243.051653] [<ffffffff83699739>] system_call_fastpath+0x16/0x1b
[ 243.053318] no locks held by trinity/5889.



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