[racket-dev] Intermittent build error in docs db

After another 20 attempts, I managed to extract (twice) the original
error that is triggering the rollback and its failure.

Instead of the

  SQL logic error or missing database

error at a rollback attempt, I now know that the more relevant error
from SQLite is

  some kind of disk I/O error occurred

Somehow, this does not feel like progress.

The error seems to happen only with read-only database connections,
where using read-only connections is the recent change. If anyone with
SQLite experience has an idea what might be wrong, I'd welcome advice.
(The journal mode is DELETE.)

At Fri, 20 Dec 2013 10:44:45 -0700, Matthew Flatt wrote:
> Thanks! I've seen this error twice before today, and I've managed to
> provoke it twice this morning --- but that's out of about 20 attempts
> this morning, so it's slow going.
> 
> At Fri, 20 Dec 2013 09:51:23 -0500, Sam Tobin-Hochstadt wrote:
> > There's been an intermittent error on a few DrDr runs on `master`. You
> > can see it here, search for 'rollback'.
> > 
> >     http://drdr.racket-lang.org/27963/pkg-src/build/make
> > 
> > This doesn't seem to be causing anything else to break the DrDr
> > notices, but since there were some DB problems with the release, I
> > thought I'd bring it up.
> > 
> > Sam
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