Attachment 131622 Details for Bug 101260 – kern.log

kern.log

kern.log (text/plain), 10.60 KB, created by Humberto Israel Perez Rodriguez on 2017-05-31 21:22:17 UTC

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Creator: Humberto Israel Perez Rodriguez

Created: 2017-05-31 21:22:17 UTC

Size: 10.60 KB

patch

obsolete

>May 31 16:19:06 BSW-2-BRASWELL kernel: [ 3221.293850] Console: switching to colour dummy device 80x25
>May 31 16:19:06 BSW-2-BRASWELL kernel: [ 3221.328134] gem_exec_reloc (1680): drop_caches: 4
>May 31 16:19:09 BSW-2-BRASWELL kernel: [ 3224.608684] Console: switching to colour frame buffer device 240x67
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.325196] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.325337] ======================================================
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.325613] WARNING: possible circular locking dependency detected
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.325889] 4.12.0-rc3-drm-tip-ww22-commit-4aa1d46+ #1 Not tainted
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.326159] ------------------------------------------------------
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.326430] kworker/u8:1/1675 is trying to acquire lock:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.326663]  (&buf->lock){+.+...}, at: [<ffffffff8153cc82>] tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327038] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327038] but task is already holding lock:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327293]  (&o_tty->termios_rwsem/1){++++..}, at: [<ffffffff8153763c>] isig+0x3c/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327663] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327663] which lock already depends on the new lock.
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.327663] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328010] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328010] the existing dependency chain (in reverse order) is:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328330] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328330] -> #2 (&o_tty->termios_rwsem/1){++++..}:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328644]        lock_acquire+0x9e/0x1e0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.328838]        down_read+0x39/0x60
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329017]        n_tty_write+0x8a/0x470
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329204]        tty_write+0x1a6/0x320
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329393]        __vfs_write+0x23/0x120
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329578]        vfs_write+0xc5/0x1d0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329758]        SyS_write+0x44/0xb0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.329938]        entry_SYSCALL_64_fastpath+0x1c/0xb1
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.330165] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.330165] -> #1 (&tty->atomic_write_lock){+.+.+.}:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.330471]        lock_acquire+0x9e/0x1e0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.330663]        __mutex_lock+0x83/0x980
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.330855]        mutex_lock_nested+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.331063]        tty_port_default_receive_buf+0x43/0x90
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.331307]        flush_to_ldisc+0x9c/0xb0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.331505]        process_one_work+0x1fe/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.331714]        worker_thread+0x49/0x3b0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.331909]        kthread+0x10f/0x150
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332088]        ret_from_fork+0x27/0x40
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332273] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332273] -> #0 (&buf->lock){+.+...}:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332532]        __lock_acquire+0x15a0/0x1790
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332741]        lock_acquire+0x9e/0x1e0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.332933]        __mutex_lock+0x83/0x980
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.333124]        mutex_lock_nested+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.333331]        tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.340959]        pty_flush_buffer+0x22/0x80
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.348609]        tty_driver_flush_buffer+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.356351]        isig+0x90/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.364092]        n_tty_receive_signal_char+0x17/0x60
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.371950]        n_tty_receive_char_special+0x8c9/0xad0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.379849]        n_tty_receive_buf_common+0xa39/0xc60
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.387798]        n_tty_receive_buf2+0xf/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.395765]        tty_ldisc_receive_buf+0x1d/0x50
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.403830]        tty_port_default_receive_buf+0x54/0x90
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.412003]        flush_to_ldisc+0x9c/0xb0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.420208]        process_one_work+0x1fe/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.428459]        worker_thread+0x49/0x3b0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.436763]        kthread+0x10f/0x150
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.445103]        ret_from_fork+0x27/0x40
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.453487] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.453487] other info that might help us debug this:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.453487] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.478614] Chain exists of:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.478614]   &buf->lock --> &tty->atomic_write_lock --> &o_tty->termios_rwsem/1
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.478614] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.504762]  Possible unsafe locking scenario:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.504762] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.522491]        CPU0                    CPU1
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.531540]        ----                    ----
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.540591]   lock(&o_tty->termios_rwsem/1);
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.549545]                                lock(&tty->atomic_write_lock);
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.558611]                                lock(&o_tty->termios_rwsem/1);
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.567599]   lock(&buf->lock);
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.576429] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.576429]  *** DEADLOCK ***
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.576429] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.601753] 6 locks held by kworker/u8:1/1675:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.610132]  #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff8109add8>] process_one_work+0x178/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.618778]  #1:  ((&buf->work)){+.+...}, at: [<ffffffff8109add8>] process_one_work+0x178/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.627428]  #2:  (&port->buf.lock/1){+.+...}, at: [<ffffffff8153c750>] flush_to_ldisc+0x20/0xb0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.636211]  #3:  (&tty->ldisc_sem){++++.+}, at: [<ffffffff8153bb4a>] tty_ldisc_ref+0x1a/0x50
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.645097]  #4:  (&tty->atomic_write_lock){+.+.+.}, at: [<ffffffff8153d073>] tty_port_default_receive_buf+0x43/0x90
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.654363]  #5:  (&o_tty->termios_rwsem/1){++++..}, at: [<ffffffff8153763c>] isig+0x3c/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.663644] 
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.663644] stack backtrace:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.681734] CPU: 2 PID: 1675 Comm: kworker/u8:1 Not tainted 4.12.0-rc3-drm-tip-ww22-commit-4aa1d46+ #1
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.691201] Hardware name: LENOVO 10G9000NUS/BRASWELL, BIOS M00KT33AUS 08/12/2015
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.700817] Workqueue: events_unbound flush_to_ldisc
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.710489] Call Trace:
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.720132]  dump_stack+0x67/0x97
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.729816]  print_circular_bug+0x1e0/0x2d0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.739565]  __lock_acquire+0x15a0/0x1790
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.749381]  lock_acquire+0x9e/0x1e0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.759161]  ? lock_acquire+0x9e/0x1e0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.768914]  ? tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.778644]  ? tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.788246]  __mutex_lock+0x83/0x980
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.797872]  ? tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.807521]  ? isig+0x59/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.817096]  ? tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.826686]  ? __mutex_lock+0x3b1/0x980
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.836266]  ? isig+0x88/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.845803]  mutex_lock_nested+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.855398]  ? mutex_lock_nested+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.865029]  tty_buffer_flush+0x32/0xa0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.874666]  pty_flush_buffer+0x22/0x80
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.884293]  tty_driver_flush_buffer+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.893953]  isig+0x90/0xf0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.903555]  n_tty_receive_signal_char+0x17/0x60
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.913299]  n_tty_receive_char_special+0x8c9/0xad0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.923052]  n_tty_receive_buf_common+0xa39/0xc60
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.932799]  n_tty_receive_buf2+0xf/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.942516]  tty_ldisc_receive_buf+0x1d/0x50
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.952252]  ? mutex_lock_nested+0x16/0x20
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.961974]  tty_port_default_receive_buf+0x54/0x90
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.971738]  flush_to_ldisc+0x9c/0xb0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.981494]  process_one_work+0x1fe/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3325.991284]  worker_thread+0x49/0x3b0
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3326.001078]  kthread+0x10f/0x150
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3326.010842]  ? process_one_work+0x670/0x670
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3326.020627]  ? kthread_create_on_node+0x40/0x40
>May 31 16:20:50 BSW-2-BRASWELL kernel: [ 3326.030400]  ret_from_fork+0x27/0x40

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Attachments on bug 101260: 131621 | 131622

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