Date: Sat, 23 Nov 1996 23:26:15 CST From: Kent Vander Velden <graphix@iastate.edu> To: hackers@freefall.freebsd.org Subject: ping and freebsd crashes Message-ID: <9611240526.AA18429@spiff.cc.iastate.edu>
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After reading the url that was mentioned earlier about ping I tried to crash an Irix 5.2 machine. I used OSF/1 v3.2 'ping -q -f -l 200 -s 5000'. The network appeared to take quite a beating. Sort of related to wanting to try this was that I have been working on a network packet analyzer and wanted to see how much of a load this pinging would cause. The network analyzer runs on a freebsd machine and uses libpcap. The interesting part of all this is the freebsd machine crashed and in fact crashed really hard. In the worst case a user's home directory and 50% of /bin and misc. was removed. I must point out that the freebsd machine was not being pinged nor was it doing the pinging it was simply a machine on the network with it's interface running in promiscuous mode. I also tried tcpdump to make sure that it was not my program that was causing problems with the same result. There where many "lnc0: missed packet -- no receive buffer" and "lnc0: Framming error" messages with the killer appearing to be "panic brelse: free buffer onto another queue?" Perhaps this problems is no longer present. I wish I could tell you the version of the os that I had but that was lost when I installed the 961014 snap to reclaim the binaries lost during the crashes. I will try to find if this problem is present with this snapshot as soon as I am in a position that I will not lose network connectivity if the machine does not come back up. This would seem like a rather serious problem. Thanks. --- Kent Vander Velden graphix@iastate.edu
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