44785 - Mozilla corrupts files in disk cache

Status: VERIFIED DUPLICATE of bug 38244

(Core :: Networking: Cache, defect, P3)

Description

[tenthumbs]

My homepage for Mozilla is a simple SSI document so its size changes
every time it's accessed. After using Mozilla for a while, including
returning to the home page and reloading it occasionally, I've noticed
that the page will eventually appear to be corrupt. After closing Mozilla
I see that the disk cache file really is corrupt and Mozilla is just
displaying what's there. Here's the tail of the file after a recent
session.

      <br>
       <br>
   </body>
</html>


</html>

r>
   </body>
</html>


Trust me, there really aren't three </html> tags in the original. Even
if I clear out the cache directory, this problem eventually recurs.

I would guess that Mozilla is not truncating the disk file after writing
to it. I also wouldn't be surprised if Mozilla doesn't corrupt other
files but I haven't found any yet

Comment 1

[neeti]

Reporter, could you provide a url where I could test this bug?

Thanks,
Neeti

Comment 2

[tenthumbs]

Unfortunately, the page is on my Apache server on my personal machine
which is generally not available.

However, I'm attaching a stripped down version of the SSI page. If
you've got a suitable server, you can try it. I'm also attaching a perl
CGI script that seems to do the same thing.

Now Mozilla doesn't always display corruption so I think something else
may be need to trigger it but it is trivial to show that files in the
disk cache are not properly truncated. Just clear out the cache, start
Mozilla and point it to, say, the CGI script, reload the page, find the
disk cache copy, and then you can see that the disk file has a size that
is always the maximum of any of the loads and it never shrinks. Look in
the file and you can see pieces of previous loads. the file will not
change when you close Mozilla.

This can't possibly be a good thing.

Comment 3

[tenthumbs]

Attachment: SSI document

Comment 4

[tenthumbs]

Attachment: Perl CGI script

Comment 5

[neeti]

*** This bug has been marked as a duplicate of 38244 ***

Comment 6

[Scott Brodmerkle]

Verified dupe.