[Users] [Bug 4379] Hangs with 100% CPU when opening particular mail

[noreply at thewildbeast.co.uk]

https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4379

--- Comment #5 from Chris Wyatt <wyattmeister at gmail.com> ---
So, there appears to be something strange going on. I tried removing most of
the plain text part of the email, and gradually pasting it back in. I didn't
paste in most of the empty lines, and did not experience any hangs.

Then I reinstated the entire text/plain part again, and it hung.

After more playing about, it seemed to stop hanging as long as I removed any
random lines (even if the line is empty) or if I added new lines.

So, from what I can tell, it relates to the specific number of lines in the
email. I looked at 2 of the emails giving me the problem. Encoded (with
quoted-printable), one has 51 lines (in its text/plain part) and the other has
52. Decoded, they both have 33 lines. I would need to do more investigation to
be sure that it was definitely related to there being 33 lines.

If I run it through strace, I can see lots of BRK calls, approximately once
every second. I'm wondering if this has something to do with it.

If it helps, I'm running a fully up-to-date Arch (64 bit). I'm having the
problem both with the package from the repo, and one I compiled myself using
claws-mail-git (AUR).

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