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

[Lyle Bickley]

I've experienced this bug as well. It has been around for several months, over
a number of "git releases" (starting with 17.5?), but it is erratic and rare.
There never seems to be anything "strange" about the email itself.

Once an email "hangs" claws, it will do so even after shutting claws down and
bringing it back up. I've found that marking the entire folder containing the
suspect email with "mark all read" "solves" the hang-up, but obviously not the
bug.

I tried setting debug on - but the problem occurs so infrequently that it make
that worthless. I suppose that I could restart claws with debug after
experiencing the error and that might produce meaningful info???

Any other suggestions?

Best,
Lyle
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On Tue, 01 Sep 2020 15:33:29 +0000
noreply at thewildbeast.co.uk wrote:

> 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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Bickley Consulting West
https://bickleywest.com

"Black holes are where God is dividing by zero"