Bug 745784 - [dev/usb/hcd] possible circular locking dependency detected when hibernating
Summary: [dev/usb/hcd] possible circular locking dependency detected when hibernating
Keywords:
Status: CLOSED DUPLICATE of bug 744154
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.2
Hardware: All
OS: Linux
unspecified
low
Target Milestone: rc
: ---
Assignee: Don Zickus
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-10-13 12:21 UTC by Stanislaw Gruszka
Modified: 2013-01-10 08:23 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-10-14 20:10:48 UTC
Target Upstream Version:

Attachments (Terms of Use)
dmesg.txt (89.17 KB, text/plain)
2011-10-13 12:29 UTC, Stanislaw Gruszka 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Description Stanislaw Gruszka 2011-10-13 12:21:49 UTC 
Description of problem:
This happens on T500 laptop when hibernating:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.32 #3
> -------------------------------------------------------
> khubd/31 is trying to acquire lock:
>  (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffff813bfc28>] usb_reset_and_verify_device+0x2b8/0x760
>
> but task is already holding lock:
>  (&dev->pm_mutex/1){+.+.+.}, at: [<ffffffff813cc6f5>] usb_external_resume_device+0x35/0xa0
>
> which lock already depends on the new lock.

Version-Release number of selected component (if applicable):
Latest rhel6 kernel from git (2.6.32-206),  compiled with debug config.

How reproducible:
100%

Steps to Reproduce:
1. pm-hibernate
Comment 1 Stanislaw Gruszka 2011-10-13 12:29:22 UTC 
Created attachment 527965 [details]
dmesg.txt

Full dmesg.
Comment 2 Don Zickus 2011-10-14 20:10:48 UTC 

*** This bug has been marked as a duplicate of bug 744154 ***
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