Date: Mon, 06 May 1996 19:07:53 -0600 From: Warner Losh <imp@village.org> To: stable@freebsd.org Subject: SLIP and memory corruption? Message-ID: <199605070107.TAA02637@rover.village.org>
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Greetings, I have a friend that has a small problem with kernel memory corruption. He has 2 slip lines on his machine. One of them always connected (or nearly so) to the village's central hub, and the other connected to another machine from time to time. He's running -stable from April 15ish. We've noticed over the past few weeks that whenever the second SLIP line is in use, he starts to see negative numbers in his runtime numbers that ps reports. He also sees routing go nuts as well. We suspect a memory dancer as we've gone to great lengths to make sure the physical memory in the machine is good by inserting wait states, disabling caches, etc. All of this has not helped the problem one iota. We've swapped SIMMs with no effect. I have a couple of questions. 1) has anybody seen this sort of behavior. 2) Are there fixes since April 15 that have even the remotest possibility of helping us and 3) where would people recommend that we look for the problem. We've noticed that there are boatloads of changes to the slip driver since the 4.4 lite sources, many of which are related to clist management (a classic recipie for a memory dancer). Finally, if PPP definitely solves this problem, we'd be happy to look into that option as well. One of the lines MUST remain slip (the one to the village) due to the vintage of the kernel running on our hub. The other can become PPP w/o a huge amount of hassle. Thank you for your time and efforts in helping us out. Warner P.S. My friend has a lot of kernel debugging experience from his days at Solbourne. I tend to trust his hunches when it comes to what is wrong with kernel things based on what he can observe. P.P.S. I've only just now subscribed to -stable.
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