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


From: Sam Steingold
Subject: bug#28176: 26.0.50; Emacs hangs on entering a specific article in gnus
Date: Tue, 22 Aug 2017 14:23:00 -0400

here is the backtrace from an identical hang with a different article in the same group:

2017-08-22 14:10:48.609113-0400 emacs[16623:7011753] [general] Connection to 'pboard' server had an error: <error: 0x7fffb7597ca0> { count = 1, transaction: 0, voucher = 0x0, contents =                    
        "XPCErrorDescription" => <string: 0x7fffb7597f18> { length = 18, contents = "Connection invalid" }
}                                                  
2017-08-22 14:11:02.771791-0400 emacs[16623:7011721] Detected potentially harmful notification post rate of 229.322 notifications per second
2017-08-22 14:11:12.773714-0400 emacs[16623:7011721] Detected potentially harmful notification post rate of 300.907 notifications per second 
2017-08-22 14:11:22.774338-0400 emacs[16623:7011721] Detected potentially harmful notification post rate of 280.44 notifications per second
2017-08-22 14:11:32.774777-0400 emacs[16623:7011721] Detected potentially harmful notification post rate of 290.527 notifications per second
emacs was compiled with optimization - stepping may behave oddly; variables may not be available.     
Process 16623 stopped                              
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP                            
    frame #0: 0x00000001001a4de9 emacs`lookup_image [inlined] search_image_cache(f=0x000000010305afa8, spec=4358862915, hash=4195912884339560560) at image.c:1454 [opt]                                      
   1451                                            
   1452   for (img = c->buckets[i]; img; img = img->next)                                             
   1453     if (img->hash == hash                  
-> 1454         && !NILP (Fequal (img->spec, spec))
   1455         && img->frame_foreground == FRAME_FOREGROUND_PIXEL (f)                                
   1456         && img->frame_background == FRAME_BACKGROUND_PIXEL (f))                               
   1457       break;                               
(lldb) bt                                          
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP                            
  * frame #0: 0x00000001001a4de9 emacs`lookup_image [inlined] search_image_cache(f=0x000000010305afa8, spec=4358862915, hash=4195912884339560560) at image.c:1454 [opt]                                      
    frame #1: 0x00000001001a4d82 emacs`lookup_image(f=0x000000010305afa8, spec=4358862915) at image.c:1739 [opt]                                                                                             
    frame #2: 0x0000000100044a68 emacs`handle_single_display_spec(it=<unavailable>, spec=<unavailable>, object=<unavailable>, overlay=<unavailable>, position=<unavailable>, bufpos=<unavailable>, display_replaced=<unavailable>, frame_window_p=<unavailable>) at xdisp.c:5299 [opt]                             
    frame #3: 0x000000010001dd85 emacs`handle_display_spec(it=0x00007fff5fbf8280, spec=4358862915, object=4523100261, overlay=0, position=0x00007fff5fbf83b8, bufpos=1765, frame_window_p=<unavailable>) at xdisp.c:4800 [opt]                                  
    frame #4: 0x00000001000452e1 emacs`handle_display_prop(it=0x00007fff5fbf8280) at xdisp.c:4719 [opt]                                                                                                      
    frame #5: 0x000000010004544b emacs`handle_stop(it=0x00007fff5fbf8280) at xdisp.c:3425 [opt]       
    frame #6: 0x0000000100048434 emacs`next_element_from_buffer(it=0x00007fff5fbf8280) at xdisp.c:8398 [opt]                                                                                                 
    frame #7: 0x000000010001c6c2 emacs`get_next_display_element(it=0x00007fff5fbf8280) at xdisp.c:6992 [opt]                                                                                                 
    frame #8: 0x000000010002ab68 emacs`display_line(it=0x00007fff5fbf8280, cursor_vpos=<unavailable>) at xdisp.c:21318 [opt]                                                                                 
    frame #9: 0x000000010002a508 emacs`try_window(window=<unavailable>, pos=(charpos = 921, bytepos = 921), flags=<unavailable>) at xdisp.c:17573 [opt]                                                      
    frame #10: 0x000000010004f8e0 emacs`redisplay_window(window=4356634629, just_this_one_p=<unavailable>) at xdisp.c:17020 [opt]                                                                            
    frame #11: 0x000000010004db36 emacs`redisplay_window_0(window=<unavailable>) at xdisp.c:14780 [opt]                                                                                                          frame #12: 0x0000000100136e86 emacs`internal_condition_case_1(bfun=(emacs`redisplay_window_0 at xdisp.c:14779), arg=4356634629, handlers=<unavailable>, hfun=(emacs`redisplay_window_error at xdisp.c:14771)) at eval.c:1347 [opt]                          
    frame #13: 0x000000010004d19d emacs`redisplay_windows(window=<unavailable>) at xdisp.c:14760 [opt]                                                                                                       
    frame #14: 0x000000010004d164 emacs`redisplay_windows(window=<unavailable>) at xdisp.c:14754 [opt]                                                                                                       
    frame #15: 0x00000001000282af emacs`redisplay_internal at xdisp.c:14249 [opt]                     
    frame #16: 0x00000001000bf92e emacs`read_char(commandflag=1, map=4351707683, prev_event=0, used_mouse_menu=0x00007fff5fbfeabf, end_time=0x0000000000000000) at keyboard.c:2484 [opt]                     
    frame #17: 0x00000001000bd40a emacs`read_key_sequence(keybuf=<unavailable>, bufsize=30, prompt=<unavailable>, dont_downcase_last=<unavailable>, can_return_switch_frame=<unavailable>, fix_current_buffer=<unavailable>, prevent_redisplay=<unavailable>) at keyboard.c:9151 [opt]                             
    frame #18: 0x00000001000bbc02 emacs`command_loop_1 at keyboard.c:1372 [opt]                       
    frame #19: 0x0000000100136e12 emacs`internal_condition_case(bfun=(emacs`command_loop_1 at keyboard.c:1263), handlers=<unavailable>, hfun=(emacs`cmd_error at keyboard.c:942)) at eval.c:1323 [opt]       
    frame #20: 0x00000001000ca800 emacs`command_loop_2(ignore=<unavailable>) at keyboard.c:1114 [opt] 
    frame #21: 0x00000001001366b9 emacs`internal_catch(tag=<unavailable>, func=(emacs`command_loop_2 at keyboard.c:1110), arg=0) at eval.c:1088 [opt]                                                        
    frame #22: 0x00000001000bae5e emacs`command_loop at keyboard.c:1093 [opt]                         
    frame #23: 0x00000001000bad6f emacs`recursive_edit_1 at keyboard.c:699 [opt]                      
    frame #24: 0x00000001000bafa3 emacs`Frecursive_edit at keyboard.c:770 [opt]                       
    frame #25: 0x00000001000b9bb7 emacs`main(argc=0, argv=<unavailable>) at emacs.c:1706 [opt]        
    frame #26: 0x00007fffae679235 libdyld.dylib`start + 1                                             
    frame #27: 0x00007fffae679235 libdyld.dylib`start + 1                                             


On Tue, Aug 22, 2017 at 11:09 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 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.



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