FreeBSD 8.2-PRERELEASE hangs under load with "live" kernel

[Kostik Belousov]

On Thu, Jan 06, 2011 at 01:31:45PM +0300, Lev Serebryakov wrote:
> Hello, Freebsd-stable.
> 
>  I've  added  torrent  client  (transmission)  to  software on my home
>  server  and it starts to hang in very unusual way: kernel works but
>  userland doesn't.
> 
>    I can ping it (and it answers). I can scroll console with
>  "scrolllock" button and keys. I can break into debugger with
>  Ctrl+SysReq and it shows, that one CPU is occupied by idle process and
>  other by "Giant tasq", but no userland processes answer: I can not
>  ssh to it, I cannot login on console, samba is dead, etc.
> 
>    "ps" in kernel debugger shows, that many of processes in "pfault"
>  state, and noting more "special".
> 
>    memtest86+ doesn't show any errors after 8 passes of tests (about
>  10 hours), so RAM looks Ok.
> 
>    What should I do in kdb to understand what happens?
> 
>    Kernel config and /var/run/dmesg.boot is attached.

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
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