Issue with 'Unknown Error: -512'

[Andriy Gapon]

on 18/07/2011 17:53 Brandon Falk said the following:
> Hello,
> 
> In recent branches (confirmed with 224119) builds compiled with clang happen to
> throw 'Unknown error: -512' in a lot of places, making the system unusable.
> (Untested on gcc compiled systems). Originally I thought the problem was with
> specific programs, then I narrowed it down to file I/O, and now I've narrowed it
> down to open() with O_TRUNC. Without O_TRUNC there seems to be no issues
> whatsoever. With O_TRUNC on open() it fails with that 'Unknown error: -512' every
> other time you run the program. Common issues, portsnap is affected, making it
> impossible to fetch/extract ports. As well as redirecting output in shells eg
> `echo 'hi' > test` fails every other try. You have the same issue with text
> editors like `edit` where it fails every other save. There are no issues with
> `echo 'hi' >> test` as there is no O_TRUNC, it only seems to be an O_TRUNC error.
> 
> Any tips? Otherwise I'll be looking into this today myself.

Just a hint that you could try using DTrace syscall and fbt providers to see where
in kernel (if in kernel) that -512 return value originates.

-- 
Andriy Gapon