bug#28176: 26.0.50; Emacs hangs on entering a specific article in gnus

[Eli Zaretskii]

> From: Sam Steingold <sds@gnu.org>
> Cc: 28176@debbugs.gnu.org
> Date: Mon, 21 Aug 2017 15:40:41 -0400
> 
> (lldb) bt
> * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
>     frame #0: 0x0000000100030788 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=8, field_width=0, 
> precision=<unavailable>, elt=4328980291, props=4412454691, 
> risky=<unavailable>) at xdisp.c:23603 [opt]
>     frame #1: 0x00000001000309d0 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=<unavailable>, 
> field_width=0, precision=<unavailable>, elt=<unavailable>, props=4412454691, 
> risky=<unavailable>) at xdisp.c:23692 [opt]
>     frame #2: 0x00000001000309d0 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=<unavailable>, 
> field_width=0, precision=<unavailable>, elt=<unavailable>, props=4412454691, 
> risky=<unavailable>) at xdisp.c:23692 [opt]
>     frame #3: 0x0000000100030b05 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=4, field_width=0, 
> precision=-66, elt=<unavailable>, props=0, risky=<unavailable>) at 
> xdisp.c:23629 [opt]
>     frame #4: 0x00000001000309d0 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=<unavailable>, 
> field_width=0, precision=<unavailable>, elt=<unavailable>, props=0, 
> risky=<unavailable>) at xdisp.c:23692 [opt]
>     frame #5: 0x00000001000309d0 
> emacs`display_mode_element(it=0x00007fff5fbf8258, depth=<unavailable>, 
> field_width=0, precision=<unavailable>, elt=<unavailable>, props=0, 
> risky=<unavailable>) at xdisp.c:23692 [opt]
>     frame #6: 0x000000010001bf09 
> emacs`display_mode_line(w=0x000000010482ea30, face_id=MODE_LINE_FACE_ID, 
> format=4315887955) at xdisp.c:23211 [opt]
>     frame #7: 0x000000010004b2e4 
> emacs`display_mode_lines(w=0x000000010482ea30) at xdisp.c:23146 [opt]
>     frame #8: 0x000000010005180f emacs`redisplay_window(window=4370655797, 
> just_this_one_p=<unavailable>) at xdisp.c:17397 [opt]

This just says that Emacs was in redisplay, displaying the mode line
in some window.

Do you always see this exact backtrace, with the same function calls
and the same arguments, when you interrupt Emacs that hangs like this?
Or does the backtrace look different every time?

Thanks.