Hard crash on 6.x -- reproducible, multiple people affected
eol1 at yahoo.com
Fri Mar 31 04:27:01 UTC 2006
Hallo everybody. Will prob end up PR'ing this but want to post to the
list first and get some feelers. At first I thought it was just me but
as the port maintainer for tor-devel I have had a couple other folk
email me with the exact same problem (believing tor to be the cause).
Problem: When tor (running in server mode), i2p, or freenet is ran (all
high bandwidth, high number of concurrent tcp / udp / ip connections,
maybe 2000+ sim connects @ a constant 4 mb) between the 2 and 4 hour
mark a system running FBSD 6 will hard crash and power off. This is
reproducible (though not on demand, just on arbitrary time between 2
and 4 hours).
Troubleshooting so far:
- It is NOT an issue on 5.x. It is an issue on both 6.0 and 6.1BETA4.
- It is not easy to reproduce. I assume a couple hundred people use
these ports and I have only had a dozen or so report this problem to
me. All of the people suffering from this though CAN reproduce this
crash on demand. I have to assume though the other 99% of users though
do not see this error for unknown reasons.
- It is not a port issue (as tor/i2p/freenet all can cause it). It is
not a java issue (was another early worry of mine but tor is written in
- The hard crash does NOT generate a dump or panic for anybody I have
spoken with. /var/crash comes up empty every time.
- It is not platform or hardware specific (this was my initial guess).
I have seen this on both the amd64 and i386 archs. I have also seen it
on various motherboards and nic's (bge, nv, em). To reiterate, running
5.x on identical hardware does not cause this crash.
- It is not a tunable or sysctrl issue as far as I can tell. Spent the
last month tuning and watching my system limits and all appears to be
- My gut feeling is this has something to do with the new network stack
introduced in 6.0.
- When not running one of the aforementioned ports, system does not
crash. I have a three week uptime currently on one of my testbeds
experiencing this problem. If I start tor / i2p / or freenet I will
crash within hours.
Help would be appreciated in resolving this or troubleshooting further.
I am at a loss here and me (along with a couple other folk that have
emailed me) have some nice expensive paperweights now as they crash on
use. If you are developer and want to look into this, I can provide
all the info you need, just let me know exactly what it is.
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