• Ross Lagerwall's avatar
    xen/manage: Fix USB interaction issues when resuming · 72978b2f
    Ross Lagerwall authored
    Commit 61a734d3 ("xen/manage: Always freeze/thaw processes when
    suspend/resuming") ensured that userspace processes were always frozen
    before suspending to reduce interaction issues when resuming devices.
    However, freeze_processes() does not freeze kernel threads.  Freeze
    kernel threads as well to prevent deadlocks with the khubd thread when
    resuming devices.
    
    This is what native suspend and resume does.
    
    Example deadlock:
    [ 7279.648010]  [<ffffffff81446bde>] ? xen_poll_irq_timeout+0x3e/0x50
    [ 7279.648010]  [<ffffffff81448d60>] xen_poll_irq+0x10/0x20
    [ 7279.648010]  [<ffffffff81011723>] xen_lock_spinning+0xb3/0x120
    [ 7279.648010]  [<ffffffff810115d1>] __raw_callee_save_xen_lock_spinning+0x11/0x20
    [ 7279.648010]  [<ffffffff815620b6>] ? usb_control_msg+0xe6/0x120
    [ 7279.648010]  [<ffffffff81747e50>] ? _raw_spin_lock_irq+0x50/0x60
    [ 7279.648010]  [<ffffffff8174522c>] wait_for_completion+0xac/0x160
    [ 7279.648010]  [<ffffffff8109c520>] ? try_to_wake_up+0x2c0/0x2c0
    [ 7279.648010]  [<ffffffff814b60f2>] dpm_wait+0x32/0x40
    [ 7279.648010]  [<ffffffff814b6eb0>] device_resume+0x90/0x210
    [ 7279.648010]  [<ffffffff814b7d71>] dpm_resume+0x121/0x250
    [ 7279.648010]  [<ffffffff8144c570>] ? xenbus_dev_request_and_reply+0xc0/0xc0
    [ 7279.648010]  [<ffffffff814b80d5>] dpm_resume_end+0x15/0x30
    [ 7279.648010]  [<ffffffff81449fba>] do_suspend+0x10a/0x200
    [ 7279.648010]  [<ffffffff8144a2f0>] ? xen_pre_suspend+0x20/0x20
    [ 7279.648010]  [<ffffffff8144a1d0>] shutdown_handler+0x120/0x150
    [ 7279.648010]  [<ffffffff8144c60f>] xenwatch_thread+0x9f/0x160
    [ 7279.648010]  [<ffffffff810ac510>] ? finish_wait+0x80/0x80
    [ 7279.648010]  [<ffffffff8108d189>] kthread+0xc9/0xe0
    [ 7279.648010]  [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80
    [ 7279.648010]  [<ffffffff8175087c>] ret_from_fork+0x7c/0xb0
    [ 7279.648010]  [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80
    
    [ 7441.216287] INFO: task khubd:89 blocked for more than 120 seconds.
    [ 7441.219457]       Tainted: G            X 3.13.11-ckt12.kz #1
    [ 7441.222176] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [ 7441.225827] khubd           D ffff88003f433440     0    89      2 0x00000000
    [ 7441.229258]  ffff88003ceb9b98 0000000000000046 ffff88003ce83000 0000000000013440
    [ 7441.232959]  ffff88003ceb9fd8 0000000000013440 ffff88003cd13000 ffff88003ce83000
    [ 7441.236658]  0000000000000286 ffff88003d3e0000 ffff88003ceb9bd0 00000001001aa01e
    [ 7441.240415] Call Trace:
    [ 7441.241614]  [<ffffffff817442f9>] schedule+0x29/0x70
    [ 7441.243930]  [<ffffffff81743406>] schedule_timeout+0x166/0x2c0
    [ 7441.246681]  [<ffffffff81075b80>] ? call_timer_fn+0x110/0x110
    [ 7441.249339]  [<ffffffff8174357e>] schedule_timeout_uninterruptible+0x1e/0x20
    [ 7441.252644]  [<ffffffff81077710>] msleep+0x20/0x30
    [ 7441.254812]  [<ffffffff81555f00>] hub_port_reset+0xf0/0x580
    [ 7441.257400]  [<ffffffff81558465>] hub_port_init+0x75/0xb40
    [ 7441.259981]  [<ffffffff814bb3c9>] ? update_autosuspend+0x39/0x60
    [ 7441.262817]  [<ffffffff814bb4f0>] ? pm_runtime_set_autosuspend_delay+0x50/0xa0
    [ 7441.266212]  [<ffffffff8155a64a>] hub_thread+0x71a/0x1750
    [ 7441.268728]  [<ffffffff810ac510>] ? finish_wait+0x80/0x80
    [ 7441.271272]  [<ffffffff81559f30>] ? usb_port_resume+0x670/0x670
    [ 7441.274067]  [<ffffffff8108d189>] kthread+0xc9/0xe0
    [ 7441.276305]  [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80
    [ 7441.279131]  [<ffffffff8175087c>] ret_from_fork+0x7c/0xb0
    [ 7441.281659]  [<ffffffff8108d0c0>] ? flush_kthread_worker+0x80/0x80
    Signed-off-by: default avatarRoss Lagerwall <ross.lagerwall@citrix.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
    72978b2f
manage.c 7.19 KB