Rolf Campbell wrote:
$ svn up
Updating '.':
svn: E200030: disk I/O error, executing statement 'RELEASE s6'
svn: E200030: sqlite: unable to open database file
svn: E200030: sqlite: unable to open database file
$ svn cleanup
svn: E200030: disk I/O error, executing statement 'RELEASE s79'
<snip>
I've had the same problem, and have found a solution: this appears for me to be an interaction with TortoiseSVN, which I have on my machine and which is entirely unaware of Cygwin.
Disabling TortoiseSVN's icon cache has completely resolved the issue for me. You can do this by running TortoiseSVN's Settings program, going to "Icon Overlays", and selecting "None" under "Status cache", then hitting Apply.
That may explain why Rolf's been hitting this despite apparently having no AV installed.
Adam