lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Sun, 22 Nov 2015 19:24:07 +0800
From:	Daniel J Blueman <daniel@...ra.org>
To:	linux-usb@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [4.3] kworker busy in pm_runtime_work

On 16 November 2015 at 23:22, Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 16 Nov 2015, Daniel J Blueman wrote:
>
>> Tuning USB suspend [1] in 4.3 on a Dell XPS 15 9553 (Skylake), I see a
>> kworker thread spinning in rpm_suspend [2].
>>
>> What is the most useful debug to get here beyond the immediate [3]?
>
> You can try doing:
>
>         echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control

kworker and ksoftirqd spinning occurs when I echo 'auto' to all the
USB control entries. Using Alan's excellent tip, we see this being
logged repeatedly at a high rate:
[  353.245180] usb usb1-port4: status 0107 change 0000
[  353.245194] usb usb1-port12: status 0507 change 0000
[  353.245202] hub 1-0:1.0: state 7 ports 16 chg 0000 evt 0000
[  353.245203] hub 1-0:1.0: hub_suspend
[  353.245205] usb usb1: bus auto-suspend, wakeup 1
[  353.245206] usb usb1: bus suspend fail, err -16
[  353.245207] hub 1-0:1.0: hub_resume
...

So, EBUSY. Both the webcam is not open, and the bluetooth interface
[1] is rfkill'd; the situation occurs even if I unload all related
modules.

What further debug would be useful?

Thanks!
  Daniel

-- [1]

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp.
Bus 001 Device 003: ID 1bcf:2b95 Sunplus Innovation Technology Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-- 
Daniel J Blueman
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists