Date: Tue, 27 Dec 1994 00:10:13 -0800 From: David Greenman <davidg@Root.COM> To: Pat_Barron@transarc.com Cc: hackers@freebsd.org Subject: Re: Why am I getting these SLIP crashes? Message-ID: <199412270810.AAA00388@corbin.Root.COM> In-Reply-To: Your message of "Tue, 27 Dec 94 02:56:27 EST." <sizwWfaSMV1bI7WkQx@transarc.com>
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>OK, I have some more data about these SLIP related crashes that I've been >happening. Here is what I've been doing to start SLIP sessions: > > 1) "cu -l /dev/cua01 -s 19200" > 2) Dial up to Cisco terminal server, start SLIP; the terminal > server gives me an IP address (chosen based on what line I've > gotten in my hunt group). > 3) Use "~^Z" to suspend cu. > 4) "slattach -h -s 19200 /dev/cua01" > 5) "ifconfig sl0 <my-ip-address>" > 6) "route add default <my-default-router-address>" > 7) "telnet <some-host>" > >At this point, the machine spontaneously reboots. No panic or anything, >just a reboot - as if the CPU has taken a double-fault or something else >that would shut it down. > >This even happens if I do "telnet localhost" in step #7 (but this may be >because a DNS lookup is being attempted across the SLIP interface). > >Now, I *can* get this to work; between step #5 and step #6, I have to >do "route add <my-network-number> <my-slip-address> 0"; I get a warning >message that says "old usage of trailing 0; assuming route to if", but >that was what I wanted anyway. *Then* I can use the network, and th >machine does not crash. > >What changed to make this happen? I am using the -current version of 2.0, >which I am sup'ing from freefall. I first noticed this behavior in a kernel >I sup'ped some time around the first or second week of December. The route cloning code was enabled. I've seen the same symptom here, but all I had to do was a 'route add default w.x.y.z' after a default route had been previously added - no telnet or anything, just add the route. The reboot without panic is most likely caused by a recursion loop occurring between two or more subroutines until the kernel stack overflows. -DG
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