FWIW, I also get this crash when opening one of my folders (nnimap) using Gnus that is shipped with Emacs. A more complete backtrace can be found below.
/Simon
Fatal error 6: Aborted
Thread 1 "emacs" received signal SIGABRT, Aborted.
raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: Filen eller katalogen finns inte.
(gdb) bt
#0 raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00000000004f6f37 in terminate_due_to_signal (sig=sig@entry=6,
backtrace_limit=backtrace_limit@entry=40) at ./debian/build-src/src/emacs.c:394
#2 0x0000000000511643 in emacs_abort () at ./debian/build-src/src/sysdep.c:2426
#3 0x00000000004574ea in redisplay_internal () at
./debian/build-src/src/lisp.h:2797
#4 0x0000000000459c22 in redisplay_preserve_echo_area
(from_where=from_where@entry=13) at ./debian/build-src/src/xdisp.c:14630
#5 0x00000000005ab860 in Fdelete_process (process=61304133) at
./debian/build-src/src/process.c:1078
#6 0x00000000005b35f5 in kill_buffer_processes (buffer=buffer@entry=0) at
./debian/build-src/src/process.c:7836
#7 0x00000000004f6dfa in shut_down_emacs (sig=sig@entry=6,
stuff=stuff@entry=0) at ./debian/build-src/src/lisp.h:855
#8 0x00000000004f6f63 in terminate_due_to_signal (sig=sig@entry=6,
backtrace_limit=backtrace_limit@entry=40) at ./debian/build-src/src/lisp.h:855
#9 0x0000000000511643 in emacs_abort () at ./debian/build-src/src/sysdep.c:2426
#10 0x00000000004574ea in redisplay_internal () at
./debian/build-src/src/lisp.h:2797
#11 0x0000000000459c22 in redisplay_preserve_echo_area
(from_where=from_where@entry=13) at ./debian/build-src/src/xdisp.c:14630
#12 0x00000000005ab860 in Fdelete_process (process=59467093) at
./debian/build-src/src/process.c:1078
#13 0x00000000005b35f5 in kill_buffer_processes (buffer=buffer@entry=0) at
./debian/build-src/src/process.c:7836
#14 0x00000000004f6d34 in shut_down_emacs (sig=sig@entry=0,
stuff=stuff@entry=0) at ./debian/build-src/src/lisp.h:855
#15 0x00000000004c3efd in x_connection_closed (dpy=dpy@entry=0x2ae86c0,
error_message=<optimized out>,
error_message@entry=0x7fffffff5880 "X protocol error: BadLength (poly
request too large or internal Xlib length error) on protocol request 139",
ioerror=ioerror@entry=false) at ./debian/build-src/src/lisp.h:855
#16 0x00000000004c7d49 in x_error_quitter (display=0x2ae86c0, event=<optimized
out>, event=<optimized out>) at ./debian/build-src/src/xterm.c:9904
#17 0x00000000004c7dcb in x_error_handler (display=0x2ae86c0,
event=0x7fffffff5a40) at ./debian/build-src/src/xterm.c:9874
#18 0x00007ffff684b11a in _XError () from /lib/x86_64-linux-gnu/libX11.so.6
#19 0x00007ffff6848077 in ?? () from /lib/x86_64-linux-gnu/libX11.so.6
#20 0x00007ffff684811d in ?? () from /lib/x86_64-linux-gnu/libX11.so.6
#21 0x00007ffff6848a55 in _XEventsQueued () from
/lib/x86_64-linux-gnu/libX11.so.6
#22 0x00007ffff683a7b7 in XPending () from /lib/x86_64-linux-gnu/libX11.so.6
#23 0x00007ffff70e420d in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
#24 0x00007ffff6bbd669 in g_main_context_prepare () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007ffff6bbe06b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ffff6bbe207 in g_main_context_pending () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff73b2b9d in gtk_events_pending () from
/lib/x86_64-linux-gnu/libgtk-3.so.0
#28 0x00000000004c4917 in XTread_socket (terminal=<optimized out>,
hold_quit=0x7fffffff5d40) at ./debian/build-src/src/xterm.c:9142
#29 0x00000000004fe1c9 in gobble_input () at
./debian/build-src/src/keyboard.c:6910
#30 0x00000000004fe875 in handle_async_input () at
./debian/build-src/src/keyboard.c:7146
#31 process_pending_signals () at ./debian/build-src/src/keyboard.c:7160
#32 0x00000000005d8dd7 in xftfont_open (f=<optimized out>, entity=70284725,
pixel_size=15) at ./debian/build-src/src/xftfont.c:391
#33 0x0000000000586aa4 in font_open_entity (f=0x1010c80
<bss_sbrk_buffer+6280288>, entity=70284725, pixel_size=15) at
./debian/build-src/src/font.c:2903
#34 0x00000000005db72a in fontset_find_font (fontset=fontset@entry=59386213,
c=c@entry=9200, face=face@entry=0x41b9720, charset_id=charset_id@entry=-1,
fallback=fallback@entry=true) at ./debian/build-src/src/lisp.h:855
#35 0x00000000005db9b1 in fontset_font (fontset=fontset@entry=59386213,
c=c@entry=9200, face=face@entry=0x41b9720, id=-1) at
./debian/build-src/src/fontset.c:788
#36 0x00000000005dbcbc in face_for_char (f=0x1010c80 <bss_sbrk_buffer+6280288>,
face=face@entry=0x41b9720, c=9200, pos=<optimized out>, object=<optimized out>)
at ./debian/build-src/src/fontset.c:990
#37 0x0000000000448473 in FACE_FOR_CHAR (object=<optimized out>, pos=<optimized
out>, character=<optimized out>, face=0x41b9720, f=<optimized out>)
at ./debian/build-src/src/dispextern.h:1818
#38 get_next_display_element (it=it@entry=0x7fffffff87f0) at
./debian/build-src/src/xdisp.c:7303
#39 0x000000000044f698 in display_line (it=it@entry=0x7fffffff87f0,
cursor_vpos=cursor_vpos@entry=0) at ./debian/build-src/src/xdisp.c:21409
#40 0x000000000045450b in try_window (window=window@entry=16919605, pos=...,
flags=flags@entry=1) at ./debian/build-src/src/xdisp.c:17627
#41 0x0000000000467cdb in redisplay_window (window=16919605,
just_this_one_p=just_this_one_p@entry=false) at
./debian/build-src/src/xdisp.c:17074
#42 0x000000000046ab7b in redisplay_window_0 (window=window@entry=16919605) at
./debian/build-src/src/xdisp.c:14831
#43 0x000000000056ce36 in internal_condition_case_1 (bfun=bfun@entry=0x46ab50
<redisplay_window_0>, arg=16919605, handlers=<optimized out>,
hfun=hfun@entry=0x42f9b0 <redisplay_window_error>) at
./debian/build-src/src/eval.c:1356
#44 0x00000000004346c2 in redisplay_windows (window=16919605) at
./debian/build-src/src/xdisp.c:14811
#45 0x0000000000457d35 in redisplay_internal () at
./debian/build-src/src/xdisp.c:14300
#46 0x0000000000459bc5 in redisplay () at ./debian/build-src/src/xdisp.c:13518
#47 0x0000000000500ecf in read_char (commandflag=commandflag@entry=1,
map=map@entry=69116419, prev_event=0,
used_mouse_menu=used_mouse_menu@entry=0x7fffffffdd8b,
end_time=end_time@entry=0x0) at ./debian/build-src/src/keyboard.c:2480
#48 0x00000000005049a0 in read_key_sequence
(keybuf=keybuf@entry=0x7fffffffde80, prompt=prompt@entry=0,
dont_downcase_last=dont_downcase_last@entry=false,
can_return_switch_frame=can_return_switch_frame@entry=true,
fix_current_buffer=fix_current_buffer@entry=true,
prevent_redisplay=prevent_redisplay@entry=false,
bufsize=30) at ./debian/build-src/src/keyboard.c:9147
--Type <RET> for more, q to quit, c to continue without paging--
Quit
(gdb) q
signature.asc
Description: PGP signature
