kern/103411: (Probably) a deadlock caused by rtorrent downloading and checking at high speeds

[Václav Haisman]

>Number:         103411
>Category:       kern
>Synopsis:       (Probably) a deadlock caused by rtorrent downloading and checking at high speeds
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Sep 19 21:00:38 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Václav Haisman
>Release:        6.1
>Organization:
SU SH
>Environment:
FreeBSD logout.sh.cvut.cz 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #0: Wed Sep 13 00:12:05 CEST 2006     root at logout.sh.cvut.cz:/usr/obj/usr/src/sys/LOGOUT  i386
>Description:
I have rather repeatable (what seems like) deadlock here. I use rtorrent to download stuff. When there are strong seends I can d/l at megabytes per second together on several torrents. The deadlock happens when rtorrent is downloading from such fast torrents and also checksumming already downloaded files.

I tried to panic the kernel and get dump by breaking into debugger from keyboard but I didn't get useful dump, because savecore didn't dump it from swap, maybe next time.

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: