> On Feb 4, 2019, at 3:43 PM, Noel Chiappa via cctalk <cctalk@classiccmp.org> > wrote: > >> From: Wayne S > >> it might be a wonky filesystem. ... >> The corruption probably came because the entire disk was going bad. > > This theory is contradicted by the fact (mentioned several times, including in > the message you were replying to) that doing a plain 'ls' bombs, but 'sleep > 300 &; ls' works fine. That translates into "the problem depends on the physical address of the code being executed". The obvious answer is bad memory. Another possibility occurs to me: bad bits in the MMU (UISAR0 register if I remember correctly). Bad memory is likely to show up with a few bits wrong; if UISAR0 has a stuck bit so the "plain" case maps incorrectly you'd expect to come up with execution that looks nothing at all like what was intended. paul
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