Bug 456065

Summary: Kernel hangs during ohci-hcd stress testing
Product: Red Hat Enterprise Linux 4 Reporter: Vitaly Mayatskikh <vmayatsk>
Component: kernelAssignee: Vitaly Mayatskikh <vmayatsk>
Status: CLOSED DUPLICATE QA Contact: Martin Jenner <mjenner>
Severity: low Docs Contact:
Priority: low    
Version: 4.8CC: prarit
Target Milestone: rc   
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2008-07-24 06:46:17 UTC Type: ---
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Description Vitaly Mayatskikh 2008-07-21 10:57:47 UTC 
Insert any h/w into ohci usb port, run two scripts in parallel:

$ while true; do rmmod ohci; modprobe ohci; done

$ while true; do lsusb; done > /dev/null

It's better to run 2-3 lsusb loops simultaneously. lsusb script outputs:

cannot read device descriptor No such device (19)
cannot read device descriptor No such device (19)
cannot open /proc/bus/usb/002/001, No such file or directory (2)

And kernel silently hangs in several minutes. Verified on x86_64 and ppc64 machines.
Comment 2 Vitaly Mayatskikh 2008-07-24 06:46:17 UTC 

*** This bug has been marked as a duplicate of 455843 ***