rTorrent + FreeBSD + pf = freeze?

Peter Kieser peter at kieser.ca
Fri Nov 20 00:25:58 UTC 2009


This problem has been going on for at least the past 2 years. I've had 
the exact same issue with rtorrent locking up or restarting machines 
running FreeBSD, regardless of the hardware used.

I did not have any sort of firewall installed (neither pf, or ipfw). If 
I loaded up rtorrent and had a number of torrents open the machines 
would lock up or restart. It was reproducible at the time, but I could 
never get anyone to admit there was a bug and I'm unable to find the 
initial posting.



Michael Schaefer wrote:
> Hello everybody,
> I encountered same problems and am kinda glad to see I'm not alone. I
> use FreeBSD 7.1-RELEASE-p8 (GENERIC) on a VIA EPIA board (800MHz C3).
> This box for the moment does nothing but torrent. I use two instances
> of rtorrent. Each with an own user and in its own screen session.
> Let's name them A and B. A seeds around 300 torrents and B around 500
> (each rtorrent instance communicates just to one specific tracker).
> The configuration is exactly the same, except B communicates with the
> track only using https (A does plain http).
> While A works 100% perfect an stable, B crashes the machine
> reproducible. When using rtorrent 0.8.3/0.12.3 this happened only
> about once a month. After upgrading to 0.8.4/0.12.4 the rate of
> crashes increased to about once a week. now i upgraded to 0.8.5/0.12.5
> and cannot even start instance B without crashing the machine
> immediately just several minutes after I started it. Sometimes it
> somehow "survives" the starting procedure (where actually all seeding
> torrents are registered at the tracker at more or less the same time)
> but then it takes about 10min - 2 hours after the hole systems crashes
> again. Like I mentioned: instance B works perfectly without any
> problems. I'm pretty sure I encountered the problem also (even not
> the heavily) during times instance B was only seeding about 300
> torrents...
> For me the system simply reboots and doesn't freeze. The logs are
> clear and show no advice concerning the problem.
> It's not a matter of hardware since I changed the board (which
> included CPU, RAM, NIC,...) and also the hard disc month ago. Also a
> heat problem can be excluded.
> Any clou about all that?
> btw: I don't use PF at all...
> regards - Michael
> On Wed, 21 Oct 2009, cpghost wrote:
>> Hi,
>> could a resource leak or bug in pf(4) crash a RELENG_7 router (as of 
>> Oct 6th)?
>> I'm experiencing frequent crashes on my soekris net4801 home router 
>> for some months now, and I'm wondering if it could be some kind of 
>> pf-related bug similar to this on OpenBSD:
>> http://www.mail-archive.com/misc@openbsd.org/msg58042.html
>> More precisely, when I fire up rtorrent-devel on some *other* machine
>>  (not the router!), everything runs fine at first. It could also run 
>> very fine for many days. BUT should I start a torrent with a large 
>> number of seeders which could saturate my link for an extended period
>>  of time, the soekris router would suddenly freeze... but not 
>> immediately: more like a few hours (3 to 6) or so of relatively heavy
>>  traffic. Only a hard reboot of the router would help. Please note 
>> that rtorrent is NOT running on the router, only its traffic is being
>>  redirected through the router.
>> So I'm suspecting some bug / resource leak in pf that would bring the
>>  kernel down somehow. What kind of resources should I monitor (and 
>> how)? Maybe that could bring some clues?
>> Oh, before anybody asks: I have no crashdumps, the router freezes 
>> totally without panicking. And it doesn't recover automatically even
>> after many hours.
>> Any ideas?
>> Thanks, -cpghost.
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