Bug 139855 – Crash in `WebCore::Font::getGlyphsAndAdvancesForSimpleText()`

• Status: RESOLVED
• Resolution: WONTFIX
• Component: WebKitGTK

[Paul Menzel]

Created attachment 243613 [details]
(gdb) t a a bt f

Using Debian Sid/unstable with `libwebkitgtk-3.0-0:i386 2.4.7-3`, Evolution. 3.12.9 crashed with a segmentation fault.

    Program terminated with signal SIGSEGV, Segmentation fault.
    #0  0xb576e7a5 in WebCore::Font::getGlyphsAndAdvancesForSimpleText (this=0xa9eac0a0, run=..., from=0, to=4, glyphBuffer=..., 
        forTextEmphasis=WebCore::Font::NotForTextEmphasis) at ../Source/WebCore/platform/graphics/FontFastPath.cpp:130
    130	../Source/WebCore/platform/graphics/FontFastPath.cpp: Datei oder Verzeichnis nicht gefunden.

Please find the whole backtrace attached.

Thread 1 (Thread 0xb0253900 (LWP 28714)):
#0  0xb576e7a5 in WebCore::Font::getGlyphsAndAdvancesForSimpleText (this=0xa9eac0a0, run=..., from=0, to=4, glyphBuffer=..., 
    forTextEmphasis=WebCore::Font::NotForTextEmphasis) at ../Source/WebCore/platform/graphics/FontFastPath.cpp:130
No locals.
#1  0xb576f534 in WebCore::Font::drawSimpleText (this=0xa9eac0a0, context=0xbfecfad0, run=..., point=..., from=0, to=4)
    at ../Source/WebCore/platform/graphics/FontFastPath.cpp:166
        glyphBuffer = {
          m_fontData = {<WTF::VectorBuffer<WebCore::SimpleFontData const*, 2048u>> = {<WTF::VectorBufferBase<WebCore::SimpleFontData const*>> = {m_buffer = 0xbfebda3c, m_capacity = 2048, m_size = 0}, m_inlineBuffer = {{__data = "\260\243\a\253", __align = {<No data fields>}}, {
                  __data = "l\346M\222", __align = {<No data fields>}}, {__data = "Ɵ\r\264", __align = {<No data fields>}}, {
                  __data = "\000\240\025\264", __align = {<No data fields>}}, {__data = "\300\200l\263", __align = {<No data fields>}}, {
                  __data = "\234\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "defs", 
                  __align = {<No data fields>}}, {__data = "\234\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\330\313F\242", __align = {<No data fields>}}, {__data = "Т\"\235", __align = {<No data fields>}}, {
                  __data = "l\346M\222", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "cape", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "upmo", __align = {<No data fields>}}, {__data = "de=&", __align = {<No data fields>}}, {
                  __data = "\000", <incomplete sequence \350\251>, __align = {<No data fields>}}, {
                  __data = "\000", <incomplete sequence \351\251>, __align = {<No data fields>}}, {__data = "\000s\252e", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = " id=", 
                  __align = {<No data fields>}}, {__data = "\v(y\265", __align = {<No data fields>}}, {__data = "\000`%\267", 
                  __align = {<No data fields>}}, {__data = "L\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\b\333", <incomplete sequence \353\277>, 
                  __align = {<No data fields>}}, {__data = "5\354x\265", __align = {<No data fields>}}, {
                  __data = "L\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\334\332", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\b\000\000", 
                  __align = {<No data fields>}}, {__data = "\274\243\a\253", __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\003\000\000", __align = {<No data fields>}}, {__data = "\260\243\a\253", 
                  __align = {<No data fields>}}, {__data = "\367\356ۺ", __align = {<No data fields>}}, {__data = "P\243\a\253", 
                  __align = {<No data fields>}}, {__data = "1", <incomplete sequence \347\251>, __align = {<No data fields>}}, {
                  __data = "\003\000\000", __align = {<No data fields>}}, {__data = "\003\000\000", __align = {<No data fields>}}, {
                  __data = "M\351x\265", __align = {<No data fields>}}, {__data = "\000s\252e", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\210\357", <incomplete sequence \350\251>, 
                  __align = {<No data fields>}}, {__data = "\233\353x\265", __align = {<No data fields>}}, {__data = "\000`%\267", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\210\357", <incomplete sequence \350\251>, __align = {<No data fields>}}, {
                  __data = "\030\334", <incomplete sequence \354\277>, __align = {<No data fields>}}, {__data = "\331\330v\265", 
                  __align = {<No data fields>}}, {__data = "L\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\003\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\214\202\217\264", __align = {<No data fields>}}, {__data = "\214\335", <incomplete sequence \354\277>, 
                  __align = {<No data fields>}}, {__data = "\334\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\350\373", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "\330U\246\264", 
                  __align = {<No data fields>}}, {__data = "8\027\035\246", __align = {<No data fields>}}, {__data = "\000\000\300A", 
                  __align = {<No data fields>}}, {__data = "\336\335\335", <incomplete sequence \335>, __align = {<No data fields>}}, {
                  __data = "\335\335\335?", __align = {<No data fields>}}, {__data = "\021\021\021\021", __align = {<No data fields>}}, {
                  __data = "\021\021\341?", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "8\027\035\246", __align = {<No data fields>}}, {__data = "\214\335", <incomplete sequence \354\277>, 
                  __align = {<No data fields>}}, {__data = "\205\002\000", __align = {<No data fields>}}, {__data = "\000 k\263", 
                  __align = {<No data fields>}}, {__data = "~\267Z\263", __align = {<No data fields>}}, {__data = "\f\000\000", 
                  __align = {<No data fields>}}, {__data = ":\253G\267", __align = {<No data fields>}}, {__data = "\271U\246\264", 
                  __align = {<No data fields>}}, {__data = "\000P\273\264", __align = {<No data fields>}}, {__data = "<]\266\264", 
                  __align = {<No data fields>}}, {__data = "\000P\273\264", __align = {<No data fields>}}, {__data = "\001\000\000", 
                  __align = {<No data fields>}}, {__data = "\t\376\267\264", __align = {<No data fields>}}, {__data = "`S\273\264", 
                  __align = {<No data fields>}}, {__data = "8\027\035\246", __align = {<No data fields>}}, {__data = "\024\000\000", 
                  __align = {<No data fields>}}, {__data = "\003\000\000", __align = {<No data fields>}}, {
                  __data = "\234\333", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "@\000\000", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\300\200l\263", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\254\334", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "`S\273\264", __align = {<No data fields>}}, {__data = "8\027\035\246", __align = {<No data fields>}}, {
                  __data = "H\334", <incomplete sequence \354\277>, __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\377\377\177\177", 
                  __align = {<No data fields>}}, {__data = "@\272", <incomplete sequence \340\270>, __align = {<No data fields>}}, {
                  __data = "\000p\265\264", __align = {<No data fields>}}, {__data = "\246Ы\264", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "9\000\000", __align = {<No data fields>}}, {__data = "A\243\217\264", __align = {<No data fields>}}, {
                  __data = "\214\334", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\211Ы\264", __align = {<No data fields>}}, {__data = "\000p\265\264", 
                  __align = {<No data fields>}}, {__data = "\210u\265\264", __align = {<No data fields>}}, {__data = ":\253G\267", 
                  __align = {<No data fields>}}, {__data = "\000p\265\264", __align = {<No data fields>}}, {__data = "\234a\246\264", 
                  __align = {<No data fields>}}, {__data = "\001\000\000", __align = {<No data fields>}}, {__data = "s@\000\264", 
                  __align = {<No data fields>}}, {__data = <incomplete sequence \371\275\244\264>, __align = {<No data fields>}}, {
                  __data = "\025v\217\264", __align = {<No data fields>}}, {__data = "\271Ƨ\264", __align = {<No data fields>}}, {
                  __data = "\206a\246\264", __align = {<No data fields>}}, {__data = "\000p\265\264", __align = {<No data fields>}}, {
                  __data = "aV\246\264", __align = {<No data fields>}}, {__data = "s@\000\264", __align = {<No data fields>}}, {
                  __data = "s@\000\264", __align = {<No data fields>}}, {__data = "8Z,\247", __align = {<No data fields>}}, {
                  __data = "\037B\251\264", __align = {<No data fields>}}, {__data = "\210u\265\264", __align = {<No data fields>}}, {
                  __data = "\b\000\000", __align = {<No data fields>}}, {__data = "\b\000\000", __align = {<No data fields>}}, {
                  __data = ",\024", <incomplete sequence \371>, __align = {<No data fields>}}, {__data = "s@\000\264", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\220\001\000", __align = {<No data fields>}}, {__data = "\240\000\000", 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {__data = "\271U\246\264", 
                  __align = {<No data fields>}}, {__data = "\000s\252e", __align = {<No data fields>}}, {__data = "\t\000\000", 
                  __align = {<No data fields>}}, {__data = "s@\000\264", __align = {<No data fields>}}, {__data = "{ﷴ", 
                  __align = {<No data fields>}}, {__data = "\000P\273\264", __align = {<No data fields>}}, {__data = "\t\000\000", 
                  __align = {<No data fields>}}, {__data = "\030\070\032\271", __align = {<No data fields>}}, {__data = "8\027\035\246", 
                  __align = {<No data fields>}}, {__data = "\325\000\270\264", __align = {<No data fields>}}, {__data = "8\027\035\246", 
                  __align = {<No data fields>}}, {__data = "\001\000\000", __align = {<No data fields>}}, {__data = ";\b\000", 
                  __align = {<No data fields>}}, {__data = "\254\334", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "W\224\266\264", __align = {<No data fields>}}, {__data = "\266\000\270\264", __align = {<No data fields>}}, {
                  __data = "\000P\273\264", __align = {<No data fields>}}, {__data = "Ù\266\264", __align = {<No data fields>}}, {
                  __data = "8\027\035\246", __align = {<No data fields>}}, {__data = "\001\000\000", __align = {<No data fields>}}, {
                  __data = ";\b\000", __align = {<No data fields>}}, {__data = "\030\070\032\271", __align = {<No data fields>}}, {
                  __data = "s@\000\264", __align = {<No data fields>}}, {__data = "\001\000\000", __align = {<No data fields>}}, {
                  __data = "\211Ы\001", __align = {<No data fields>}}, {__data = "8Z,\247", __align = {<No data fields>}}, {
                  __data = "\210u\265\264", __align = {<No data fields>}}, {__data = "\370R\273\264", __align = {<No data fields>}}, {
                  __data = "\213\231\266\264", __align = {<No data fields>}}, {__data = "\000P\273\264", __align = {<No data fields>}}, {
                  __data = "8\027\035\246", __align = {<No data fields>}}, {__data = "\366ǧ\264", __align = {<No data fields>}}, {
                  __data = "\000P\273\264", __align = {<No data fields>}}, {__data = "\366\221\266\264", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\t\000\000", __align = {<No data fields>}}, {
                  __data = "\f\335", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\370\017\200\272", __align = {<No data fields>}}, {
                  __data = "\370\017\200\272", __align = {<No data fields>}}, {__data = "\f\335", <incomplete sequence \353\277>, 
                  __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\264\335", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "\370\017\200\272", 
                  __align = {<No data fields>}}, {__data = "\211:\251\264", __align = {<No data fields>}}, {__data = "hk\032\271", 
                  __align = {<No data fields>}}, {__data = "(k\032\271", __align = {<No data fields>}}, {__data = "X9\032\271", 
                  __align = {<No data fields>}}, {__data = "\b9\032\271", __align = {<No data fields>}}, {__data = "\270\070\032\271", 
                  __align = {<No data fields>}}, {__data = "h8\032\271", __align = {<No data fields>}}, {__data = "\360\066\020\271", 
                  __align = {<No data fields>}}, {__data = "\250\066\020\271", __align = {<No data fields>}}, {
                  __data = "\030\070\032\271", __align = {<No data fields>}}, {__data = "\264\335", <incomplete sequence \353\277>, 
                  __align = {<No data fields>}}, {__data = "6+\266\264", __align = {<No data fields>}}, {__data = "\000P\273\264", 
                  __align = {<No data fields>}}, {__data = "+ȸ\264", __align = {<No data fields>}}, {
                  __data = "\264\335", <incomplete sequence \353\277>, __align = {<No data fields>}}, {__data = "hk\032\271", 
                  __align = {<No data fields>}}, {__data = "hk\032\271", __align = {<No data fields>}}, {__data = "\000s\252e", 
                  __align = {<No data fields>}}, {__data = "\367Ǹ\264", __align = {<No data fields>}}, {__data = "\000P\273\264", 
                  __align = {<No data fields>}}, {__data = "\r\221\266\264", __align = {<No data fields>}}...}}, <No data fields>}, 
          m_glyphs = {<WTF::VectorBuffer<cairo_glyph_t, 2048u>> = {<WTF::VectorBufferBase<cairo_glyph_t>> = {m_buffer = 0xbfebfa48, 
                m_capacity = 2048, m_size = 0}, m_inlineBuffer = {{__data = "\230\034\247\270\261z#m6[|\304Jq\037K\334n\225c", 
                  __align = {<No data fields>}}, {__data = "\267_\000\231\355{π\325\033\253t;V`l l\022\064", 
                  __align = {<No data fields>}}, {__data = "'\361\065ӓ\032\365vzO)\205\225Q\213\315P\260\"\236", 
                  __align = {<No data fields>}}, {__data = "\367\377\366\211\267^\374չ\237>\271\272A\372q\266\321D\240", 
                  __align = {<No data fields>}}, {__data = "۱\342\251/\374\356Eq\274o\201\225(e\223m+aK", __align = {<No data fields>}}, {
                  __data = "\037\326\326\342\375 7SS\021)Dd\035쪩\275eN", __align = {<No data fields>}}, {
                  __data = "\336\030\335Z|h\233\273\367\330\367\062\234\231\006S'\256\004\066", __align = {<No data fields>}}, {
                  __data = "MY1oW\367\331\334}x\333\353\367־\021\303Lk\223", __align = {<No data fields>}}, {
                  __data = "\032\321<26o\263\275\376\220\032\034\367\060r\000\363\326H,", __align = {<No data fields>}}, {
                  __data = "\240\276\246\260\362\066\r\216\207\333b\272\253\066\224\066\f\256\201\246", __align = {<No data fields>}}, {
                  __data = "v\227-\246\207\336任qoM\276O\033ݟ", <incomplete sequence \370\224>, __align = {<No data fields>}}, {
                  __data = "\300'm\374\021\000\263\301\351\345\252\021.\000\000\000\000IEN", __align = {<No data fields>}}, {
                  __data = "D\256B`\202", '\000' <repeats 14 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = "\000\000\000\000\350\373\353\277\000\b\000\000\000\000\000\000\000\000\000", 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 15 times>, {
                  __data = "\000\000\000\000(\375\353\277\000\b\000\000\000\000\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = "8\375\353\277\000\b", '\000' <repeats 13 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 15 times>, {
                  __data = '\000' <repeats 16 times>, "\210\376", <incomplete sequence \353\277>, __align = {<No data fields>}}, {
                  __data = "\000\b", '\000' <repeats 17 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = "\000\000\000\000\b\377\353\277\000\b\000\000\000\000\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 24 times>, {
                  __data = "\370\000\354\277\000\b", '\000' <repeats 13 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 33 times>, {
                  __data = "\000\000\000\000\000\000\000\000\250\003\354\277\000\b\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {__data = '\000' <repeats 19 times>, 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 16 times>, "(", <incomplete sequence \354\277>, 
                  __align = {<No data fields>}}, {__data = "\000\b", '\000' <repeats 17 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}}, {
                  __data = "\000\000\000\000X\004\354\277\000\b\000\000\000\000\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 20 times>, {
                  __data = "\370\005\354\277\000\b", '\000' <repeats 13 times>, __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 12 times>, {
                  __data = '\000' <repeats 12 times>, "\b\a\354\277\000\b\000", __align = {<No data fields>}}, {
                  __data = '\000' <repeats 19 times>, __align = {<No data fields>}} <repeats 1156 times>, {
                  __data = '\000' <repeats 18 times>, "\001", __align = {<No data fields>}}, {
                  __data = "\\b쿾p\213\260\224b\354\277 \\\221\260\000\000\000", __align = {<No data fields>}}, {
                  __data = '\000' <repeats 12 times>, "\371o\213\260p^\221\260", __align = {<No data fields>}}, {
                  __data = "\001\000\000\000\224b\354\277y\243\207\260p^\221\260\020\000\000", __align = {<No data fields>}}, {
                  __data = "\224b\354\277\b+1\247\022R\213\260\240\223\340\270\001\000\000", __align = {<No data fields>}}, {
                  __data = "H^1\247\035R\213\260\224b\354\277\020\000\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = "\001\000\000\000\020c\354\277\020\000\000\000\020\000\000\000P", <incomplete sequence \340\270>, 
                  __align = {<No data fields>}}, {__data = "\001\000\000\000$b\354\277\\b\354\277p\243\207\260\300\231\217\260", 
                  __align = {<No data fields>}}, {__data = "\314b\354\277\020\"1\247P/1\247\000\000\000\000\000\000\000", 
                  __align = {<No data fields>}}, {__data = '\000' <repeats 16 times>, "\314", <incomplete sequence \354\277>, 
                  __align = {<No data fields>}}, {__data = "\220-1\247\000\000\000\000P/1\247H+1\247\000\000\000", 
                  __align = {<No data fields>}}, {__data = "\000\000\000\000\020\000\000\000\020\000\000\000%\000\000\000\177J\207\002", 
                  __align = {<No data fields>}}, {__data = "\200\251\213\260", '\000' <repeats 15 times>, __align = {<No data fields>}}, {
                  __data = "\000\000\000\000\220-1\247\020c\354\277\000\000\000\000\000\000\000", __align = {<No data fields>}}, {
                  __data = "\020\000\000\000\020\000\000\000\061\000\000\000\177J\a\000\240Z\214\260", __align = {<No data fields>}}, {
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                  __align = {<No data fields>}}, {__data = "bitte sc", __align = {<No data fields>}}, {__data = "hon auf ", 
                  __align = {<No data fields>}}, {__data = "dem Weg ", __align = {<No data fields>}}...}}, <No data fields>}, 
          m_initialAdvance = {m_width = 0, m_height = 0}}
        startX = <optimized out>
        startPoint = {m_x = -3.32557543e-18, m_y = -1.3189829e-07}
#2  0xb576520e in WebCore::Font::drawText (this=0xa9eac0a0, context=0xbfecfad0, run=..., point=..., from=0, to=4, 
    customFontNotReadyAction=WebCore::Font::DoNotPaintIfFontNotReady) at ../Source/WebCore/platform/graphics/Font.cpp:338
No locals.
#3  0xb57781cd in WebCore::GraphicsContext::drawText (this=0xbfecfad0, font=..., run=..., point=..., from=0, to=-1)
    at ../Source/WebCore/platform/graphics/GraphicsContext.cpp:447
[…]

[Paul Menzel]

I am currently using Evolution 3.22.6, and I haven’t experienced this bug in a while. So it’s possible, that if it was a bug in WebKitGTK+, that it has been fixed in the meantime.

So please close it as you see fit.

[Michael Catanzaro]

OK, this looks like a very old bug indeed.