Hi,
I saw several bug reports on Fedora on gvim getting signal SIGSEGV at
_cairo_hash_table_lookup function. It is curious that segfault happened at
beginning of function, at '{', so I looked more into it.
I checked backtrace in core dump, which has about 130 000 frames. These frames
are mostly calling two functions - gui_update_cursor() and gui_mch_stop_blink()
- I think there is infinity loop between these two functions, so gvim ate all
stack memory.
Backtrace:
#0 0x00007f4df8adbca6 in _cairo_hash_table_lookup (hash_table=0x56411b554800,
key=key@entry=0x7ffd93deb028) at cairo-hash.c:340
#1 0x00007f4df8b136e9 in _cairo_scaled_glyph_lookup
(scaled_font=scaled_font@entry=0x56411b10f220, index=<optimized out>,
info=info@entry=CAIRO_SCALED_GLYPH_INFO_METRICS,
scaled_glyph_ret=scaled_glyph_ret@entry=0x7ffd93deb098) at
cairo-scaled-font.c:3004
#2 0x00007f4df8b14a8e in _cairo_scaled_font_single_glyph_device_extents
(extents=0x7ffd93deb3cc, glyph=0x7ffd93debb10, scaled_font=0x56411b10f220) at
cairo-scaled-font.c:2176
#3 _cairo_scaled_font_glyph_device_extents
(scaled_font=scaled_font@entry=0x56411b10f220,
glyphs=glyphs@entry=0x7ffd93debb10, num_glyphs=num_glyphs@entry=1,
extents=extents@entry=0x7ffd93deb3cc,
overlap_out=overlap_out@entry=0x7ffd93deb3ac) at cairo-scaled-font.c:2228
#4 0x00007f4df8ad1e34 in _cairo_composite_rectangles_init_for_glyphs
(extents=extents@entry=0x7ffd93deb3b0, surface=surface@entry=0x56411abdf830,
op=op@entry=CAIRO_OPERATOR_OVER,
source=source@entry=0x7ffd93deb7c0,
scaled_font=scaled_font@entry=0x56411b10f220,
glyphs=glyphs@entry=0x7ffd93debb10, num_glyphs=1, clip=0x56411b425e40,
overlap=0x7ffd93deb3ac)
at cairo-composite-rectangles.c:446
#5 0x00007f4df8ad244e in _cairo_compositor_glyphs (compositor=0x7f4df8dc8d00
<compositor>, surface=surface@entry=0x56411abdf830,
op=op@entry=CAIRO_OPERATOR_OVER, source=source@entry=0x7ffd93deb7c0,
glyphs=glyphs@entry=0x7ffd93debb10, num_glyphs=num_glyphs@entry=1,
scaled_font=0x56411b10f220, clip=0x56411b425e40) at cairo-compositor.c:238
#6 0x00007f4df8b4ba40 in _cairo_xlib_surface_glyphs (_surface=<optimized out>,
op=CAIRO_OPERATOR_OVER, source=0x7ffd93deb7c0, glyphs=0x7ffd93debb10,
num_glyphs=1, scaled_font=0x56411b10f220,
clip=0x56411b425e40) at cairo-xlib-surface.c:1667
#7 0x00007f4df8b1cb3c in _cairo_surface_show_text_glyphs
(surface=0x56411abdf830, op=CAIRO_OPERATOR_OVER,
source=source@entry=0x7ffd93deb7c0, utf8=0x0, utf8_len=<optimized out>,
glyphs=0x7ffd93debb10,
num_glyphs=<optimized out>, clusters=0x0, num_clusters=<optimized out>,
cluster_flags=(unknown: 0), scaled_font=0x56411b10f220, clip=0x56411b425e40) at
cairo-surface.c:2890
#8 0x00007f4df8adb5a3 in _cairo_gstate_show_text_glyphs
(gstate=0x56411b53bda8, glyphs=<optimized out>, num_glyphs=<optimized out>,
info=0x0) at cairo-gstate.c:2077
#9 0x00007f4df8acd374 in cairo_show_glyphs (cr=<optimized out>,
glyphs=<optimized out>, num_glyphs=<optimized out>) at cairo.c:3630
#10 0x00007f4df901f89b in pango_cairo_renderer_show_text_glyphs
(renderer=<optimized out>, text=text@entry=0x0, text_len=text_len@entry=0,
clusters=clusters@entry=0x0, num_clusters=0, backward=0,
font=0x56411b316890, x=0, y=0, glyphs=<optimized out>, glyphs=<optimized
out>) at ../pango/pangocairo-render.c:531
#11 0x00007f4df901fbff in pango_cairo_renderer_draw_glyphs (renderer=<optimized
out>, font=<optimized out>, glyphs=<optimized out>, x=<optimized out>,
y=<optimized out>) at ../pango/pangocairo-render.c:547
#12 0x00007f4df8df2fb9 in pango_renderer_draw_glyphs (renderer=0x56411b3a36c0,
font=0x56411b316890, glyphs=0x56411b214c60, x=0, y=0) at
../pango/pango-renderer.c:643
#13 0x00007f4df901fe64 in _pango_cairo_do_glyph_string (do_path=0,
glyphs=0x56411b214c60, font=0x56411b316890, cr=0x56411b53bbe0) at
../pango/pangocairo-render.c:959
#14 pango_cairo_show_glyph_string (cr=0x56411b53bbe0, font=0x56411b316890,
glyphs=0x56411b214c60) at ../pango/pangocairo-render.c:1095
#15 0x0000564119397025 in draw_glyph_string ()
#16 0x000056411939a688 in gui_gtk2_draw_string ()
#17 0x000056411938c576 in gui_outstr_nowrap ()
#18 0x000056411938cc84 in gui_redraw_block.part ()
#19 0x000056411938cdc3 in gui_undraw_cursor.part ()
#20 0x000056411938d24b in gui_update_cursor ()
#21 0x000056411939c234 in gui_mch_stop_blink ()
#22 0x000056411938d021 in gui_update_cursor ()
#23 0x000056411939c234 in gui_mch_stop_blink ()
#24 0x000056411938d021 in gui_update_cursor ()
#25 0x000056411939c234 in gui_mch_stop_blink ()
#26 0x000056411938d021 in gui_update_cursor ()
....(many calls of gui_mch_stop_blink() and gui_update_cursor())
#130787 0x000056411939c234 in gui_mch_stop_blink ()
#130788 0x000056411938d021 in gui_update_cursor ()
#130789 0x00005641193901c9 in gui_write ()
#130790 0x00005641193709b8 in ui_write ()
#130791 0x000056411938ed30 in gui_resize_shell ()
#130792 0x00005641193dfcd4 in main_loop ()
#130793 0x00005641193e1147 in vim_main2 ()
#130794 0x00005641191df028 in main ()
Problem is that I'm not able to reproduce this segfault, so I cannot properly
test some solutions for it. My guess is the issue was introduced with
patchlevel 1294, because there was added gui_mch_stop_blink() call.
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