kern/95512: [uplcom] uplcom(4) causes system hangups

[Kyryll A Mirnenko aka Mirya]

The following reply was made to PR kern/95512; it has been noted by GNATS.

From: Kyryll A Mirnenko aka Mirya <mirya at matrix.ua>
To: bug-followup at FreeBSD.org,
 mirya at matrix.ua
Cc:  
Subject: Re: kern/95512: [uplcom] uplcom(4) causes system hangups
Date: Mon, 9 Oct 2006 01:23:42 +0300

 Updated to 6.2-BETA2, the problem still exists though can't get hangup on 
 incoming call directly. Here's what I do:
 
 - direct call
 - received incoming call - modem starts negotiations
 - two "putc to a clist with no reserved cblocks" kernel messages  on ttyv0
 - getty tries to open /dev/ttyU0
 - a couple of "putc to a clist with no reserved cblocks" an one "ucom0: open 
 bulk out error (addr 2): IN_USE" kernel message on console
 - getty reports /dev/ttyU0 can't be opened
 - modem hands up
 - retry the above sequence with the same effect except for the fact two 
 additional "putc to a clist with no reserved cblocks" kernel messages come on 
 direct call
 - after modem hangup unplug USB2COM connector
 - got panic with uhci IRQ handler as current process
 
 -- 
 Regards, Mirya
 ICQ #313898202