Re: 3.14.0-rc3 btrfs scrub is preventing my laptop from going to sleep

Marc MERLIN
2014-02-27T23:30:21Z

On Thu, Feb 27, 2014 at 11:06:56AM -0800, Marc MERLIN wrote:
> This does not happen consistently, but sometimes:
>
> PM: Preparing system for mem sleep
> Freezing user space processes ...
> (...)
> Freezing of tasks failed after 20.002 seconds (1 tasks refusing to freeze, wq_busy=0):
> btrfs D ffff88017639c800 0 12239 12224 0x00000084
> ffff880165ec1960 0000000000000086 ffff880165ec1fd8 ffff88017639c2d0
> 00000000000141c0 ffff88017639c2d0 ffff88007b874000 ffff8804062fa480
> 0000000000000000 ffff880175837ec0 ffff88007b874220 ffff880165ec1970
> Call Trace:
> [<ffffffff8160b0d9>] schedule+0x73/0x75
> [<ffffffff8126e94c>] scrub_pages+0x27e/0x426
> [<ffffffff81085062>] ? finish_wait+0x65/0x65
> [<ffffffff81271732>] scrub_stripe+0xada/0xc9e
> [<ffffffff812719cc>] scrub_chunk.isra.9+0xd6/0x10d
> [<ffffffff81271c77>] scrub_enumerate_chunks+0x274/0x418
> [<ffffffff81085000>] ? finish_wait+0x3/0x65
> [<ffffffff812723bb>] btrfs_scrub_dev+0x254/0x3cb
> [<ffffffff8116ddab>] ? __mnt_want_write+0x62/0x78
> [<ffffffff81255c68>] btrfs_ioctl+0x1114/0x24b1
> [<ffffffff81140698>] ? ____cache_alloc+0x1c/0x29b
> [<ffffffff81140a06>] ? kmem_cache_alloc_node+0xef/0x179
> [<ffffffff8160d7b3>] ? _raw_spin_unlock+0x17/0x2a
> [<ffffffff81163ade>] do_vfs_ioctl+0x3d2/0x41d
> [<ffffffff8116bd00>] ? __fget+0x6f/0x79
> [<ffffffff81163b80>] SyS_ioctl+0x57/0x82
> [<ffffffff8161426d>] system_call_fastpath+0x1a/0x1f

Some time later, I go this one, not sure if it's btrfs' fault or not:
usb 1-11: new full-speed USB device number 7 using xhci_hcd

Freezing of tasks failed after 20.006 seconds (1 tasks refusing to freeze, wq_busy=0):
laptop_mode D ffff8800048c4a80 0 6657 1 0x00000084
ffff880037f2bde0 0000000000000086 ffff880037f2bfd8 ffff8800048c4550
00000000000141c0 ffff8800048c4550 ffff8804072280e8 ffff8804072280ec
ffff8800048c4550 ffff8804072280f0 00000000ffffffff ffff880037f2bdf0
Call Trace:
[<ffffffff8160b0d9>] schedule+0x73/0x75
[<ffffffff8160b39a>] schedule_preempt_disabled+0x18/0x24
[<ffffffff8160bed1>] __mutex_lock_slowpath+0x158/0x1cf
[<ffffffff8160bf5f>] mutex_lock+0x17/0x27
[<ffffffff8146b4d0>] control_store+0x44/0xb1
[<ffffffff814623cd>] dev_attr_store+0x18/0x24
[<ffffffff811b1598>] sysfs_kf_write+0x3e/0x40
[<ffffffff811b47f5>] kernfs_fop_write+0xc2/0xff
[<ffffffff81155417>] vfs_write+0xab/0x107
[<ffffffff81155b19>] SyS_write+0x46/0x79
[<ffffffff8161426d>] system_call_fastpath+0x1a/0x1f

Restarting tasks ... done.