usb/93949 : ugen(4)-related repeatable kernel panic in 6.1-PRERELEASE

[Anish Mistry]

The following reply was made to PR usb/93949; it has been noted by GNATS.

From: Anish Mistry <amistry at am-productions.biz>
To: Eugene Grosbein <eugen at grosbein.pp.ru>
Cc: bug-followup at freebsd.org
Subject: Re: usb/93949 : ugen(4)-related repeatable kernel panic in 6.1-PRERELEASE
Date: Tue, 9 May 2006 01:20:26 -0400

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 Alright.  I've been able to reproduce this panic.  The problem is that=20
 the thread that called select() is gone (since the device is=20
 detached) when clear_selinfo_list is called in kern_select().  The=20
 easiest way to reproduce this is to plug in a usb mouse and have it=20
 attached as ugen and then have a small program call select() on the=20
 0.1 endpoint with a long timeout (ie. 10 seconds).  While the select=20
 call is waiting pull the plug on the device and when the operation=20
 times out you'll get the panic.
 I'm not sure how to handle this case.  It seems that=20
 clear_selinfo_list should be able to handle this case.
 
 =2D-=20
 Anish Mistry
 amistry at am-productions.biz
 AM Productions http://am-productions.biz/
 
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