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Bug 745784

Summary: [dev/usb/hcd] possible circular locking dependency detected when hibernating
Product: Red Hat Enterprise Linux 6 Reporter: Stanislaw Gruszka <sgruszka>
Component: kernelAssignee: Don Zickus <dzickus>
Status: CLOSED DUPLICATE QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: low Docs Contact:
Priority: unspecified    
Version: 6.2CC: arozansk, jfeeney
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-10-14 20:10:48 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
dmesg.txt none

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 ***