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Re: kern/22646 (Panic in ohci_add_done())

The following reply was made to PR kern/22646; it has been noted by GNATS.

From: Andreas Gustafsson <>
To: Nick Hudson <>
Subject: Re: kern/22646 (Panic in ohci_add_done())
Date: Sun, 24 Apr 2016 18:54:06 +0300

 Nick Hudson wrote:
 > > > Can you increase USBHIST_SIZE
 > > To how much?  500000?
 > That should do it. :)
 Actually, it didn't: with USBHIST_SIZE=500000, the kernel failed to
 boot.  I reduced it to 100000, and it booted again.
 With your patch, the system no longer locks up, presumably due to the
 added "break" statements.  Instead, after a few runs of gphoto2 that
 hang and need to be manually interrupted by a pair of control C:s as
 before, all subsequent runs of gphoto2 exit by themselves in less than
 a second.  In the above usbhist2 output, each gphoto2 run hung and was
 interrupted by C-c C-c, except for the last one:
   # sh
   # sh
   # sh
   # vmstat -u >usbhist2.txt
 The output from "vmstat -u usbhist" is at
 > Full dmesg showing the bus with the camera (and other devices) as well 
 > please.
 Andreas Gustafsson,

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