Date: Wed, 23 Sep 1998 20:08:50 -0700 From: Robert Clark <Clark@open.org> To: pius@ienet.com Cc: "freebsd-questions@FreeBSD.ORG" <freebsd-questions@FreeBSD.ORG> Subject: Re: FreeBSD 2.2.7 box freezes occasionally Message-ID: <3609B7C2.E62A8D3C@open.org> References: <199809231853.LAA24335@iago.ienet.com>
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The last time I ran into something like this, a dumbass local administrator was using the same hub port twice. IE:Port fifteen was a normal port, but port sixteen was a crossed over version of port fifteen. Both ports were in service, and it was creating unseen collisions. A collision at that level can cause weird effects. (The CS/CMA stuff doesn't even see them.) You might see FCS errors if you have the tools. (Hint hint: these unseen collisions can be a one-way problem, and cause larger packets more grief. The longer a packet is, the more likely that it will get hit.) I've also seen misconfigured routers bounce packets until they expire. Similar weird kind of effects there. What kind of network card? Swapping out the cabling can sometimes help. (I'm tired, gotta run. [RC]) pius@ienet.com wrote: > > Hi, > > We have a box running 2.2-19980730-SNAP (so that's from about a week > after 2.2.7 was released) that occasionally freezes up. I'm looking > for some ideas as to why this might be happening. The symptoms are as > follows: > > The box still responds to pings and traceroutes. > > The DNS server on the box still responds to queries. > > When I telnet to the box, I get the "Connected to ..." and > "Escape character is '^]'." messages, but I don't get a login > prompt. Same thing with the web server: I can telnet to port 80, > and I'll get the "Connected to ..." and "Escape character ..." > messages, but when I enter an HTTP request, the server won't > respond. > > The console is frozen. > > The box has the following configuration: > > 350 MHz Pentium II > 128 MB RAM > DPT RAID controller that mirrors 2 9GB drives > DPT SmartBus Integration Kit > cheap S3 AGP video card > > The kernel was recompiled to support quotas, bpf, and 24-character > usernames, and maxusers was set to 64. None of the servers on the > machine are currently being used very much. So the load should be very > light. > > I said earlier that this problem occurs occasionally. This is actually > "only" the 2nd time it's happened since we installed the machine about > 2 months ago (The first time it happened we were running a pre-2.2.7 > SNAP). > > The machine is at a remote location. So someone needs to drive down > there to check out the console and reboot it. We haven't been able to > reboot it yet after today's lock-up, but the last time this happened > fsck wasn't able to fix one of the drives, and we just re-installed > the OS from scratch. > > The first time the machine froze during a "make world". Today it froze > while I was running cvsup to update the ports tree. > > Any ideas? Are there any known problems with the DPT driver? (Let me > know if there's some other information that I should try to get that > would help to diagnose the problem.) > > Thanks very much for any help, > Pius > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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