Package: icedove
Version: 2.0.0.9-3
Severity: grave
Justification: renders package unusable


I've just noticed several instances of Icedove corrupting a small
percentage of individual messages from an IMAP INBOX folder (of
approximately 1600 messages) that is cached locally for offline use.
This corruption persists between invocations of Icedove, and can be
triggered under undetermined conditions by simply viewing an email that
previously could be viewed without problem.

At first, when I saw no Debian bug reports for data corruption, I assumed
the problem was peculiar to me (e.g., corrupted files outside of Icedove,
or flaky RAM).  However, I noticed Thunderbird upstream Bugzilla has
numerous bug reports and comments suggesting others are experiencing
similar data corruption.

I first noticed the corruption in a series of 3 messages from a single
person in a single conversational thread over the course of several days.
When I hit Ctrl-U to view the message source, each message appeared to
have had the majority of the top of the text removed, and only a From_
line (with new timestamp) and "X-Mozilla-Status" and "X-Mozilla-Status2"
headers present.  (Although it might not be relevant, each of those three
messages was a "multipart/alternative" plain/HTML with a deep nesting
of quoted past emails.)

I verified that the mbox-based message spool on the IMAP server (Debian
"dovecot-mapd" 1.0.rc15-2etch1) was uncorrupted, that the IMAP server
served the message correctly to other clients, and 

After replacing those messages with ones from backups, and restarting
Thunderbird, I noticed corruption occur spontaneously on two occasions
with other messages.  In both cases, I was doing spot checks for
corruption of other messages within Icedove, had visited a message, left
it, then returned less than a minute later to find the message corrupted.
After this happened twice, I decided the corruption was likely to occur.

At this point, I don't think the problem is specific to me, nor to the
messages.  Commonality I noticed among the messages is that were all
generated by GMail or Yahoo Mail, and they were all multipart plain/HTML.
One or two *might* have had attachments, but no more than two.

I've tried quitting Icedove, deleting the "INBOX.msf" file, and
restarting Icedove, which causes Icedove to re-download the entire folder.
The corrupted messages are replaced with uncorrupted ones, and I believe
I've lost only my To-Do labels.  I've done only light spot-checking
since then, finding no corruption, before filing this bug report.
I suspect that the corruption will return.

The only other thing I can think to mention is that I compact the folder
every few days, so conceivably that's one way that corruption of the
cache index might start.

I'm reporting this bug to Debian for several reasons: (1) users might
be best advised to remain at 1.5.x for now, if this problem proves
to be 2.0.x-specific; (2) this is a grave bug that has implications
for promotion to "stable"; (3) Debian maintainers might wish to help
investigation upstream; (4) perhaps there is a chance the bug is
Icedove-specific, distinct from the upstream Thunderbird bugs.


-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 
'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-3-686 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages icedove depends on:
ii  debianutils             2.28.2           Miscellaneous utilities specific t
ii  fontconfig              2.5.0-2          generic font configuration library
ii  libatk1.0-0             1.20.0-1         The ATK accessibility toolkit
ii  libc6                   2.7-6            GNU C Library: Shared libraries
ii  libcairo2               1.4.14-1         The Cairo 2D vector graphics libra
ii  libfontconfig1          2.5.0-2          generic font configuration library
ii  libfreetype6            2.3.5-1+b1       FreeType 2 font engine, shared lib
ii  libgcc1                 1:4.3-20080116-1 GCC support library
ii  libglib2.0-0            2.14.5-2         The GLib library of C routines
ii  libgtk2.0-0             2.12.5-2         The GTK+ graphical user interface 
ii  libhunspell-1.1-0       1.1.9-1          spell checker and morphological an
ii  libjpeg62               6b-14            The Independent JPEG Group's JPEG 
ii  libnspr4-0d             4.7.0~1.9b1-2    NetScape Portable Runtime Library
ii  libnss3-1d              3.12.0~1.9b1-2   Network Security Service libraries
ii  libpango1.0-0           1.18.4-1         Layout and rendering of internatio
ii  libstdc++6              4.3-20080116-1   The GNU Standard C++ Library v3
ii  libx11-6                2:1.0.3-7        X11 client-side library
ii  libxft2                 2.1.12-2         FreeType-based font drawing librar
ii  libxinerama1            1:1.0.2-1        X11 Xinerama extension library
ii  libxrender1             1:0.9.4-1        X Rendering Extension client libra
ii  libxt6                  1:1.0.5-3        X11 toolkit intrinsics library
ii  psmisc                  22.6-1           Utilities that use the proc filesy
ii  zlib1g                  1:1.2.3.3.dfsg-8 compression library - runtime

icedove recommends no packages.

-- no debconf information



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