Well it's almost definitely a hardware problem, because it occurs in
Linux and MacOS.

Try temporarily for testing, replacing the memory, hard drive, ethernet,
and motherboard, to locate the problem.

Cameron Kaiser wrote:
> 
> 1.4.2 running on a Mac IIci. I went to lunch, came back and found my remote
> logins had hung up. When I looked on the console, in the middle of the
> normal syslog crap was:
> 
> unknown OS trap 0xa000, no trap address available
> panic: mrg_aline_super()
> Stopped at      _Debugger+0x6:  unlk    a6
> db>
> 
> The machine was totally unresponsive. Not even CTRL-OPEN APPLE-RESET would
> rouse it. I had to press the reset button on the front. Now the Finder
> is crashing and it won't even boot!
> 
> What happened? System uptime was about 15 hours to this point. Mac IIci,
> Farallon EtherWave NuBus, 2.05GB Quantum HD, 32MB RAM, no additional hardware
> and standard 1.4.2 distribution kernel. First kernel panic I've seen after
> running it off and on for about a week and a half.