• Vitaly Kuznetsov's avatar
    kernel: hung_task.c: disable on suspend · 507f2f17
    Vitaly Kuznetsov authored
    [ Upstream commit a1c6ca3c6de763459a6e93b644ec6518c890ba1c ]
    
    It is possible to observe hung_task complaints when system goes to
    suspend-to-idle state:
    
     # echo freeze > /sys/power/state
    
     PM: Syncing filesystems ... done.
     Freezing user space processes ... (elapsed 0.001 seconds) done.
     OOM killer disabled.
     Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
     sd 0:0:0:0: [sda] Synchronizing SCSI cache
     INFO: task bash:1569 blocked for more than 120 seconds.
           Not tainted 4.19.0-rc3_+ #687
     "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
     bash            D    0  1569    604 0x00000000
     Call Trace:
      ? __schedule+0x1fe/0x7e0
      schedule+0x28/0x80
      suspend_devices_and_enter+0x4ac/0x750
      pm_suspend+0x2c0/0x310
    
    Register a PM notifier to disable the detector on suspend and re-enable
    back on wakeup.
    Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
    507f2f17
hung_task.c 6.79 KB