Bug 857394

Summary: usb circular locking on suspend
Product: Red Hat Enterprise Linux 6 Reporter: Stanislaw Gruszka <sgruszka>
Component: kernelAssignee: Don Zickus <dzickus>
Status: CLOSED CURRENTRELEASE QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.3   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2012-11-13 16:10:00 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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dmesg.txt none

Description Stanislaw Gruszka 2012-09-14 10:14:53 UTC 
Description of problem:

test_suspend/6296 is trying to acquire lock:
 (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffff813cff38>] usb_reset_and_verify_device+0x2b8/0x760

but task is already holding lock:
 (&dev->pm_mutex/1){+.+...}, at: [<ffffffff813dca95>] usb_external_resume_device+0x35/0xa0

Version-Release number of selected component (if applicable):
RHEL6.3 debug kernel.

Steps to Reproduce:
1. Suspend to ram resume
Comment 1 Stanislaw Gruszka 2012-09-14 10:16:37 UTC 
Created attachment 612791 [details]
dmesg.txt
Comment 3 Don Zickus 2012-11-09 20:16:55 UTC 
Hi Stanislaw,

I believe this was fixed in bz832126 and should be available in -310.el6 and later.

Let me know if that fixes it for you or not.

Cheers,
Don
Comment 4 Stanislaw Gruszka 2012-11-13 16:10:00 UTC 
Yes, no sign of warning on updated kernel.