bug#41407: 28.0.50; infinite loop "Article 53570 has a nil data header" on "Exiting summary buffer and applying spam rules"

[Sam Steingold]

To exit *Summary gmane.emacs.gnus.general*, I hit `c`
(gnus-summary-catchup-and-exit) and get an infinite loop of repeating
messages:


--8<---------------cut here---------------start------------->8---
Exiting summary buffer and applying spam rules
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Article 53564 has a nil data header
Article 53563 has a nil data header
Article 53562 has a nil data header
Article 53561 has a nil data header
Article 53560 has a nil data header
Article 53559 has a nil data header
Article 53558 has a nil data header
Article 53557 has a nil data header
Article 53556 has a nil data header
Article 53555 has a nil data header
Article 53554 has a nil data header
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
--8<---------------cut here---------------end--------------->8---



When I `C-g` out of this, I see this in the *Summary
gmane.emacs.gnus.general*:


--8<---------------cut here---------------start------------->8---
! +[  22: +=> gmane.emacs.gnus. 20200511T174632] How to debug scoring?
!A   [  24: +Lars Ingebrigtsen    20200519T094354] 
C. [  22: +Lars Ingebrigtsen    20200519T092352] Re: new wifi connection = nntp 
timeout = Emacs restart?
C. [  17: +Lars Ingebrigtsen    20200519T093447] Re: new wifi connection = nntp 
timeout = Emacs restart?, Re: new wifi connection = nntp timeout = Emacs 
restart?
C.   <  13: +Lars Ingebrigtsen    20200519T093617> 
C. [  12: +Lars Ingebrigtsen    20200519T094220] Re: How often do the 
Emacs-Cloud nnimap folder needs to be cleaned up?
C.+[   6:  kevin shell          20200519T093507] Fold Unfold threads
C.   [  16: +Andreas Schwab       20200519T102811] 
--8<---------------cut here---------------end--------------->8---




In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 
Version 10.14.6 (Build 18G4032))
 of 2020-05-18 built on BZ-C02XR5CGJG5L
Repository revision: b1fe27d77db8f819641231ca46725f3eed0b4d9b
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Recent messages:
Article 53570 has a nil data header
Article 53569 has a nil data header
Article 53568 has a nil data header
Article 53567 has a nil data header
Article 53566 has a nil data header
Article 53565 has a nil data header
Quit retrieving data from nntp
Quit
End of buffer [12 times]
Mark saved where search started

Configured using:
 'configure --with-imagemagick --with-mailutils --with-ns
 
PKG_CONFIG_PATH=/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick/lib/pkgconfig:/usr/local/opt/gnutls/lib/pkgconfig:/usr/local/opt/jansson/lib/pkgconfig:/usr/local/opt/libtiff/lib/pkgconfig:/usr/local/opt/libpng/lib/pkgconfig:/usr/local/opt/libjpeg/lib/pkgconfig:/usr/local/opt/freetype/lib/pkgconfig'

Configured features:
JPEG TIFF PNG IMAGEMAGICK NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS NS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
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Features:
(shadow emacsbug smtpmail canlock rot13 bbdb-message mailalias sendmail
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view ein-completer ein-notification ein-scratchsheet ein-worksheet
poly-ein display-line-numbers polymode poly-lock polymode-base
polymode-weave polymode-export polymode-compat polymode-methods
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ein-query ein-log ein-classes ein-core request autorevert filenotify
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xml dom bbdb-gnus gnutls network-stream nsm nntp gnus-group gnus-undo
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Memory information:
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-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1671
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://mideasttruth.com https://ffii.org http://islamexposedonline.com
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