Re: Rendering issue with view source and large embedded images

<[email protected]> Wed, 9 Oct 2024 15:52:28 +0200

Newsgroups	gmane.comp.web.dillo.devel
Message-ID	<[email protected]>

Hi Rodrigo,

Rodrigo Arias <[email protected]> wrote:

> Hi,
> 
> On Tue, Oct 08, 2024 at 10:55:37PM +0200, [email protected] wrote:
> >Hi,
> >
> >Rodrigo Arias <[email protected]> wrote:
> >  
> >> >$ fltk-config --version
> >> >1.3.3  
> >>
> >> I suspect the glich may be related to this old FLTK version. Can
> >> you reproduce the bug with the last FLTK 1.3.9 release? You may
> >> need to install it from source.  
> >
> >Just tried, but getting some linker errors building Dillo with it.
> >Would probably need some patches to make that version work on
> >OpenBSD, maybe thats why they are still stuck on an older version of
> >FLTK.

I managed to get the newer FLTK working and built Dillo with it, but
unfortunately it doesn't fix the view-source glitch or the image
rendering problem.

> >a_Dpi_ccc   : OpSend  [2F] Info=0xebed4db4980 Flags=0
> >a_Capi_ccc  : OpSend  [2F] Info=0xebee90cbd00 Flags=0
> >READ Failed with -1: Connection reset by peer  
> 
> Can you place a breakpoint in GDB here and print the backtrace (bt)?
> It may be interesting to see how we arrive at this reset error.

I'm not exactly sure how to set the breakpoint for that specific event,
but I managed to get a more detailed backtrace which might be useful
(see attached).

> With a corrupted heap you will see all kind of weird errors. Use 
> Valgrind to get an idea of where things start to go wrong.

Thanks, I will try to give Valgrind a shot soon. 

Speaking of weird errors, here is some glitch-art I made with Dillo,
which introduces corruption into the data stream, resulting in
some interesting jpeg artifacts:

The original image:
https://alex.envs.net/test/dillo-test1.png

Glitched:
https://alex.envs.net/test/dillo-glitch-comp1.png
https://alex.envs.net/test/dillo-glitch-comp2.png
https://alex.envs.net/test/dillo-glitch-comp3.png

Regards,
Alex

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dillo-bt1.txt (text/plain, 17.7 KB)

#0  _libc_write_cancel (fd=<optimized out>, buf=<optimized out>, nbytes=<optimized out>)
    at /usr/src/lib/libc/sys/w_write.c:28
        _tib = 0x51fbf7d4fc0
        _cantcancel = <optimized out>
        ret = 54
#1  0x0000051ffb817f6e in __sflush (fp=0x51ffb8470f8 <__sF+152>)
    at /usr/src/lib/libc/stdio/fflush.c:77
        t = <optimized out>
        p = 0x51fe6c2d000 "a_Dpi_ccc   : OpSend  [2F] Info=0x51fe3e9aec0 Flags=0\naoW0iQqM5wCFBHPpT4vEupw2otka0EPHyGyhIJAwCcpyeTyeeaZrGn21kljNaSzPFdQecPNUBl+dlxx/u0+XT7B/D76hay3JlimjikSVVC5ZWOQQf9mgCKw12/wBMjKWjQIDuyWtonYgjBGWUn"...
        n = 54
        off = <optimized out>
#2  0x0000051ffb83b2ff in __sfvwrite (fp=0x51ffb8470f8 <__sF+152>, uio=0x78dbc99f79e8)
    at /usr/src/lib/libc/stdio/fvwrite.c:199
        len = 1
        iov = 0x78dbc99f76a0
        p = <optimized out>
        w = 1
        nldist = 0
        nlknown = <error reading variable nlknown (Cannot access memory at address 0x1)>
        nl = <optimized out>
        s = <optimized out>
#3  0x0000051ffb7aedef in __sprint (fp=0x51ffb8470f8 <__sF+152>, uio=<optimized out>)
    at /usr/src/lib/libc/stdio/vfprintf.c:112
        err = <optimized out>
#4  __vfprintf (fp=0x51ffb8470f8 <__sF+152>, 
    fmt0=0x51d54c0fee0 "%-*s: %-*s [%d%s] Info=%p Flags=%d\n", ap=0x78dbc99f7b20)
    at /usr/src/lib/libc/stdio/vfprintf.c:1078
        blanks = ' ' <repeats 16 times>
        zeroes = '0' <repeats 16 times>
        xdigs_lower = "0123456789abcdef"
        xdigs_upper = "0123456789ABCDEF"
        n_msg = ": *printf used %n, aborting: "
        fparg = {dbl = 6.5654099039072447e-310, ldbl = <invalid float value>}
        expstr = "\000\300\313\303\037\005\000"
        uio = {uio_iov = 0x78dbc99f7690, uio_iovcnt = 1, uio_resid = 1}
        iov = {{iov_base = 0x51d54c0ff02, iov_len = 1}, {iov_base = 0x78dbc99f78c3, iov_len = 1}, {
            iov_base = 0x78dbc99f78b9, iov_len = 11}, {iov_base = 0x46, iov_len = 35}, {
            iov_base = 0x51ffb8515a0 <__isthreaded>, iov_len = 5635140102312}, {
            iov_base = 0x51fe75a9260, iov_len = 13900661707426679414}, {iov_base = 0x78dbc99f7730, 
            iov_len = 0}, {iov_base = 0x520088628a8, iov_len = 132885375842184}}
        buf = "\200qA7 \005\000\000a\207\364\353\027\061\253\341\320x\237\311\333x\000\000\270\237\305T\035\005\000\000\200\252\344P \005\000\000\200\356OD\035\005\000K831.7 KB\000V4_è\004\000%&\275\247\037\005\000\000\000\000\000\000V\334\002\000\000\000\000\000\001\000\000\000\350\065\061fe3e9aec0"
        ox = "0"
        statargtable = {{intarg = -912294816, uintarg = 3382672480, longarg = 132885375843424, 
            ulongarg = 132885375843424, longlongarg = 132885375843424, 
            ulonglongarg = 132885375843424, ptrdiffarg = 132885375843424, 
            sizearg = 132885375843424, ssizearg = 132885375843424, intmaxarg = 132885375843424, 
            uintmaxarg = 132885375843424, pvoidarg = 0x78dbc99f7c60, 
            pchararg = 0x78dbc99f7c60 "Sv9l8o5OFI37/AMcYoAzq3NEgsf7K1W9vLJbo2wi8tGkZB8zYP3SKw63NEmsjpWq2V3fJaNciLy3eN2B2tk/dBoAW90+xurCz1Kx/0OKaZreaOZy6xOACCCBkqQfQnjvUWuwTW8enJI9lJGbbMUtohG9dzDLZAJOQalvZ9PGn2ejWd5vhWdp57uSNlUswCjCjLYAHpk5"..., 
            pschararg = 0x78dbc99f7c60 "Sv9l8o5OFI37/AMcYoAzq3NEgsf7K1W9vLJbo2wi8tGkZB8zYP3SKw63NEmsjpWq2V3fJaNciLy3eN2B2tk/dBoAW90+xurCz1Kx/0OKaZreaOZy6xOACCCBkqQfQnjvUWuwTW8enJI9lJGbbMUtohG9dzDLZAJOQalvZ9PGn2ejWd5vhWdp57uSNlUswCjCjLYAHpk5"..., pshortarg = 0x78dbc99f7c60, 
            pintarg = 0x78dbc99f7c60, plongarg = 0x78dbc99f7c60, plonglongarg = 0x78dbc99f7c60, 
            pptrdiffarg = 0x78dbc99f7c60, pssizearg = 0x78dbc99f7c60, pintmaxarg = 0x78dbc99f7c60, 
            doublearg = 6.5654099038938061e-310, longdoublearg = <invalid float value>, 
            wintarg = -912294816, 
            pwchararg = 0x78dbc99f7c60 L"\x6c397653\x4f356f38\x37334946\x634d412f\x7a416f59\x454e3371\x37667367\x3957314b\x624a4c76\x6977326f\x6b477438\x7a38425a\x53335059\x3336774b\x736d454e\x7157706a\x66335632\x634e614a\x33794c69\x42324e65\x2f6b7432\x416f4264\x2b303957\x43727578\x784b317a\x4b4f302f\x65725a61\x795a4f61\x414f7836\x42434343\x6651716b\x766a6e51\x77755755\x65385754\x39494a6e\x62474a6c\x74554d62\x3947686f\x4c447a64\x4f4a415a\x766c6151\x4750395a\x6a65326e\x76356457\x70645768\x53753735\x73556c4e\x436a4377\x41594c6a\x356b7048\x724a5636\x58363051\x57504e54\x32653133\x37736c6d\x6a6d7962\x46554b57\x62475a79\x4f416c67\x4f79646a\x4844416c\x3433464d\x2b6e6e54\x55305778\x447a4638\x536b7345\x6c794d6b\x4a6e7a58\x55303950\x42544865\x73346d63\x324b3770\x6132486b\x73535565\x79713370\x426a6b78\x50716a7a\x61727053\x34425450\x58736e63\x53307931\x4b656561\x6d684262\x724b5549\x54346767\x36773872\x46566363\x684e6334\x33535462\x6b71334e\x67577546\x6245686d\x32737952\x44715157\x596b7138\x4e586679\x70624741\x61546d32\x7975386b\x4b4b4b53\x6c4d5046\x61626d6d\x486e4c69\x4a50354a\x43414749\x64555861\x34306c4c\x595a7551\x314a345a\x7754524c\x346a5373\x514f434f\x51504343\x68397269\x3832594a\x58367065\x2b78664e\x70526454\x6a307573\x56476f63\x42427767\x55486241\x72764f64\x58725755\x6d6d6f46\x576d4757\x6e4c776c\x73304f37\x71796b6b\x2b735556\x77646833\x6f417742\x744f7735\x62644441\x30653773\x72703069\x6e704e64\x6c6d5573\x4c6e592b\x50426e6c\x43675450\x48746d73\x6d6b4a56\x4c383069\x4d356965\x45717164\x35704943\x5a484c58\x7a59742f\x7a363931\x694f4171\x734b6456\x7930414e\x4c647535\x644c3146\x66764c4e\x6751337a\x7841774b\x36766a6a\x30357955\x31324361\x654c4e79\x74696739\x756a6a33\x77726462\x7379644d\x43705141\x736e6371\x53463365\x764c644b\x2f41412f\x63766c70\x61487461\x53723253\x6768592b\x4769646b\x77594559\x5776644d\x3675726f\x31577473\x3246486c\x325a6c6c\x55635573\x64457542\x416f7969\x6267644f\x676d386b\x68716e43\x4566746d\x6d623056\x61613147\x5359344b\x69727852\x6b486b49\x56636341\x49393159\x56366244\x30327763\x7831754e\x52534761"...}, {intarg = 0, uintarg = 0, longarg = 0, 
            ulongarg = 0, longlongarg = 0, ulonglongarg = 0, ptrdiffarg = 0, sizearg = 0, 
            ssizearg = 0, intmaxarg = 0, uintmaxarg = 0, pvoidarg = 0x0, pchararg = 0x0, 
            pschararg = 0x0, pshortarg = 0x0, pintarg = 0x0, plongarg = 0x0, plonglongarg = 0x0, 
            pptrdiffarg = 0x0, pssizearg = 0x0, pintmaxarg = 0x0, doublearg = 0, 
            longdoublearg = <invalid float value>, wintarg = 0, pwchararg = 0x0}, {
            intarg = -912294832, uintarg = 3382672464, longarg = 132885375843408, 
            ulongarg = 132885375843408, longlongarg = 132885375843408, 
            ulonglongarg = 132885375843408, ptrdiffarg = 132885375843408, 
            sizearg = 132885375843408, ssizearg = 132885375843408, intmaxarg = 132885375843408, 
            uintmaxarg = 132885375843408, pvoidarg = 0x78dbc99f7c50, 
            pchararg = 0x78dbc99f7c50 "5qisyf8I7JB9tAc3Sv9l8o5OFI37/AMcYoAzq3NEgsf7K1W9vLJbo2wi8tGkZB8zYP3SKw63NEmsjpWq2V3fJaNciLy3eN2B2tk/dBoAW90+xurCz1Kx/0OKaZreaOZy6xOACCCBkqQfQnjvUWuwTW8enJI9lJGbbMUtohG9dzDLZAJOQalvZ9PGn2ejWd5vhWdp57uS"..., 
            pschararg = 0x78dbc99f7c50 "5qisyf8I7JB9tAc3Sv9l8o5OFI37/AMcYoAzq3NEgsf7K1W9vLJbo2wi8tGkZB8zYP3SKw63NEmsjpWq2V3fJaNciLy3eN2B2tk/dBoAW90+xurCz1Kx/0OKaZreaOZy6xOACCCBkqQfQnjvUWuwTW8enJI9lJGbbMUtohG9dzDLZAJOQalvZ9PGn2ejWd5vhWdp57uS"..., pshortarg = 0x78dbc99f7c50, 
            pintarg = 0x78dbc99f7c50, plongarg = 0x78dbc99f7c50, plonglongarg = 0x78dbc99f7c50, 
            pptrdiffarg = 0x78dbc99f7c50, pssizearg = 0x78dbc99f7c50, pintmaxarg = 0x78dbc99f7c50, 
            doublearg = 6.5654099038930156e-310, longdoublearg = <invalid float value>, 
            wintarg = -912294832, 
            pwchararg = 0x78dbc99f7c50 L"\x73697135\x49386679\x39424a37\x33634174\x6c397653\x4f356f38\x37334946\x634d412f\x7a416f59\x454e3371\x37667367\x3957314b\x624a4c76\x6977326f\x6b477438\x7a38425a\x53335059\x3336774b\x736d454e\x7157706a\x66335632\x634e614a\x33794c69\x42324e65\x2f6b7432\x416f4264\x2b303957\x43727578\x784b317a\x4b4f302f\x65725a61\x795a4f61\x414f7836\x42434343\x6651716b\x766a6e51\x77755755\x65385754\x39494a6e\x62474a6c\x74554d62\x3947686f\x4c447a64\x4f4a415a\x766c6151\x4750395a\x6a65326e\x76356457\x70645768\x53753735\x73556c4e\x436a4377\x41594c6a\x356b7048\x724a5636\x58363051\x57504e54\x32653133\x37736c6d\x6a6d7962\x46554b57\x62475a79\x4f416c67\x4f79646a\x4844416c\x3433464d\x2b6e6e54\x55305778\x447a4638\x536b7345\x6c794d6b\x4a6e7a58\x55303950\x42544865\x73346d63\x324b3770\x6132486b\x73535565\x79713370\x426a6b78\x50716a7a\x61727053\x34425450\x58736e63\x53307931\x4b656561\x6d684262\x724b5549\x54346767\x36773872\x46566363\x684e6334\x33535462\x6b71334e\x67577546\x6245686d\x32737952\x44715157\x596b7138\x4e586679\x70624741\x61546d32\x7975386b\x4b4b4b53\x6c4d5046\x61626d6d\x486e4c69\x4a50354a\x43414749\x64555861\x34306c4c\x595a7551\x314a345a\x7754524c\x346a5373\x514f434f\x51504343\x68397269\x3832594a\x58367065\x2b78664e\x70526454\x6a307573\x56476f63\x42427767\x55486241\x72764f64\x58725755\x6d6d6f46\x576d4757\x6e4c776c\x73304f37\x71796b6b\x2b735556\x77646833\x6f417742\x744f7735\x62644441\x30653773\x72703069\x6e704e64\x6c6d5573\x4c6e592b\x50426e6c\x43675450\x48746d73\x6d6b4a56\x4c383069\x4d356965\x45717164\x35704943\x5a484c58\x7a59742f\x7a363931\x694f4171\x734b6456\x7930414e\x4c647535\x644c3146\x66764c4e\x6751337a\x7841774b\x36766a6a\x30357955\x31324361\x654c4e79\x74696739\x756a6a33\x77726462\x7379644d\x43705141\x736e6371\x53463365\x764c644b\x2f41412f\x63766c70\x61487461\x53723253\x6768592b\x4769646b\x77594559\x5776644d\x3675726f\x31577473\x3246486c\x325a6c6c\x55635573\x64457542\x416f7969\x6267644f\x676d386b\x68716e43\x4566746d\x6d623056\x61613147\x5359344b\x69727852\x6b486b49\x56636341\x49393159"...}, {intarg = 276066240, uintarg = 276066240, 
            longarg = 5635273158592, ulongarg = 5635273158592, longlongarg = 5635273158592, 
            ulonglongarg = 5635273158592, ptrdiffarg = 5635273158592, sizearg = 5635273158592, 
            ssizearg = 5635273158592, intmaxarg = 5635273158592, uintmaxarg = 5635273158592, 
            pvoidarg = 0x52010746fc0, pchararg = 0x52010746fc0 "\002", 
            pschararg = 0x52010746fc0 "\002", pshortarg = 0x52010746fc0, pintarg = 0x52010746fc0, 
            plongarg = 0x52010746fc0, plonglongarg = 0x52010746fc0, pptrdiffarg = 0x52010746fc0, 
            pssizearg = 0x52010746fc0, pintmaxarg = 0x52010746fc0, 
            doublearg = 2.7841948725915978e-311, longdoublearg = <invalid float value>, 
            wintarg = 276066240, pwchararg = 0x52010746fc0 L"\002\xdfdfdfdf\xe759b780ԟ"}, {
            intarg = 276066280, uintarg = 276066280, longarg = 5635273158632, 
            ulongarg = 5635273158632, longlongarg = 5635273158632, ulonglongarg = 5635273158632, 
            ptrdiffarg = 5635273158632, sizearg = 5635273158632, ssizearg = 5635273158632, 
            intmaxarg = 5635273158632, uintmaxarg = 5635273158632, pvoidarg = 0x52010746fe8, 
            pchararg = 0x52010746fe8 "0I\310T\035\005", 
            pschararg = 0x52010746fe8 "0I\310T\035\005", pshortarg = 0x52010746fe8, 
            pintarg = 0x52010746fe8, plongarg = 0x52010746fe8, plonglongarg = 0x52010746fe8, 
            pptrdiffarg = 0x52010746fe8, pssizearg = 0x52010746fe8, pintmaxarg = 0x52010746fe8, 
            doublearg = 2.7841948726113605e-311, longdoublearg = <invalid float value>, 
            wintarg = 276066280, 
            pwchararg = 0x52010746fe8 L"\x54c84930ԝ\x10752280Ԡ\xe759ea00ԟ"<error: Cannot access memory at address 0x52010747000>}, {intarg = -912295888, uintarg = 3382671408, 
            longarg = 132885375842352, ulongarg = 132885375842352, longlongarg = 132885375842352, 
            ulonglongarg = 132885375842352, ptrdiffarg = 132885375842352, 
            sizearg = 132885375842352, ssizearg = 132885375842352, intmaxarg = 132885375842352, 
            uintmaxarg = 132885375842352, pvoidarg = 0x78dbc99f7830, 
            pchararg = 0x78dbc99f7830 "px\237\311\333x", 
            pschararg = 0x78dbc99f7830 "px\237\311\333x", pshortarg = 0x78dbc99f7830, 
            pintarg = 0x78dbc99f7830, plongarg = 0x78dbc99f7830, plonglongarg = 0x78dbc99f7830, 
            pptrdiffarg = 0x78dbc99f7830, pssizearg = 0x78dbc99f7830, pintmaxarg = 0x78dbc99f7830, 
            doublearg = 6.5654099038408422e-310, longdoublearg = <invalid float value>, 
            wintarg = -912295888, 
            pwchararg = 0x78dbc99f7830 L"\xc99f7870磛\x54c5ad23ԝ\x4a8c3𭱖\x37417180Ԡ"}, {
            intarg = 1357173760, uintarg = 1357173760, longarg = 5636354266112, 
            ulongarg = 5636354266112, longlongarg = 5636354266112, ulonglongarg = 5636354266112, 
            ptrdiffarg = 5636354266112, sizearg = 5636354266112, ssizearg = 5636354266112, 
            intmaxarg = 5636354266112, uintmaxarg = 5636354266112, pvoidarg = 0x52050e4d400, 
            pchararg = 0x52050e4d400 "\200\267Y\347\037\005", 
            pschararg = 0x52050e4d400 "\200\267Y\347\037\005", pshortarg = 0x52050e4d400, 
            pintarg = 0x52050e4d400, plongarg = 0x52050e4d400, plonglongarg = 0x52050e4d400, 
            pptrdiffarg = 0x52050e4d400, pssizearg = 0x52050e4d400, pintmaxarg = 0x52050e4d400, 
            doublearg = 2.7847290106766905e-311, longdoublearg = <invalid float value>, 
            wintarg = 1357173760, 
            pwchararg = 0x52050e4d400 L"\xe759b780ԟ\xe758dac0ԟ\x107724b0Ԡ\xba0ad860ԟ"}, {
            intarg = -912295824, uintarg = 3382671472, longarg = 132885375842416, 
            ulongarg = 132885375842416, longlongarg = 132885375842416, 
            ulonglongarg = 132885375842416, ptrdiffarg = 132885375842416, 
            sizearg = 132885375842416, ssizearg = 132885375842416, intmaxarg = 132885375842416, 
            uintmaxarg = 132885375842416, pvoidarg = 0x78dbc99f7870, 
            pchararg = 0x78dbc99f7870 "\320x\237\311\333x", 
            pschararg = 0x78dbc99f7870 "\320x\237\311\333x", pshortarg = 0x78dbc99f7870, 
            pintarg = 0x78dbc99f7870, plongarg = 0x78dbc99f7870, plonglongarg = 0x78dbc99f7870, 
            pptrdiffarg = 0x78dbc99f7870, pssizearg = 0x78dbc99f7870, pintmaxarg = 0x78dbc99f7870, 
            doublearg = 6.5654099038440043e-310, longdoublearg = <invalid float value>, 
            wintarg = -912295824, 
            pwchararg = 0x78dbc99f7870 L"\xc99f78d0磛\x54c59fb8ԝ\x50e4aa80Ԡ\x444fee80\x4b00051d\x2e313338\x424b2037\x5f345600\x4a8c3\xa7bd2625ԟ"}}
        orgap = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x78dbc99f7b50, 
            reg_save_area = 0x78dbc99f7a70}}
        decimal_point = 0x0
        dtoaresult = 0x0
        fmt = <optimized out>
        argtable = <optimized out>
        nextarg = 9
        iovp = 0x78dbc99f76a0
        ret = <optimized out>
        convbuf = <optimized out>
        convbufsiz = <optimized out>
        n = <optimized out>
        xdigs = 0x51ffb7715b0 <__vfprintf.xdigs_lower> "0123456789abcdef0123456789ABCDEF: *printf used %n, aborting: "
        size = <optimized out>
        ndig = 0
        lead = 0
        expsize = 1312
        expchar = 0 '\000'
        cp = <optimized out>
        ch = <optimized out>
        flags = <optimized out>
        dprec = <optimized out>
        width = <optimized out>
        prec = <optimized out>
        sign = <optimized out>
        argtablesiz = <optimized out>
        n2 = <optimized out>
        signflag = <optimized out>
        expt = <optimized out>
        dtoaend = <optimized out>
        _umax = <optimized out>
        base = <optimized out>
        realsz = <optimized out>
#5  0x0000051ffb7abad3 in _libc_vfprintf (fp=0x51ffb8470f8 <__sF+152>, 
    fmt0=0x51d54c0fee0 "%-*s: %-*s [%d%s] Info=%p Flags=%d\n", ap=0x78dbc99f7b20)
    at /usr/src/lib/libc/stdio/vfprintf.c:279
        ret = <optimized out>
#6  0x0000051ffb82f2e5 in _libc_printf (fmt=0x1 <error: Cannot access memory at address 0x1>)
    at /usr/src/lib/libc/stdio/printf.c:44
        ap = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x78dbc99f7b68, 
            reg_save_area = 0x78dbc99f7a70}}
        ret = <optimized out>
#7  0x0000051d54c6abdd in Chain_debug_msg (
    FuncStr=0x36 <error: Cannot access memory at address 0x36>, Op=<optimized out>, Branch=0, 
    Dir=<optimized out>, Info=0x51fe3e9aec0) at chain.c:31
        StrOps = <optimized out>
#8  a_Chain_check (FuncStr=0x36 <error: Cannot access memory at address 0x36>, Op=<optimized out>, 
    Branch=0, Dir=<optimized out>, Info=0x51fe3e9aec0) at chain.c:192
        ret = <error reading variable ret (Cannot access memory at address 0x0)>
#9  0x0000051d54cbac32 in a_Dpi_ccc (Op=2, Branch=2, Dir=1, Info=0x51fe3e9aec0, 
    Data1=0x51f59a06440, Data2=0x0) at dpi.c:652
        SockFD = <error reading variable SockFD (Cannot access memory at address 0xffffffffffffffff)>
        conn = <optimized out>
        st = <optimized out>
#10 0x0000051d54c6a922 in a_Chain_fcb (Op=1, Info=<optimized out>, Data1=0x51ffb8470f8 <__sF+152>, 
    Data2=0x0) at chain.c:116
        ret = <error reading variable ret (Cannot access memory at address 0x0)>
#11 0x0000051d54cbc943 in a_IO_ccc (Op=2, Branch=2, Dir=1, Info=0x52010746940, 
    Data1=<optimized out>, Data2=0x0) at IO.c:454
        io = <optimized out>
        dbuf = 0x51f59a06440
        newline = <optimized out>
        msglen = <optimized out>
#12 IO_read (io=<optimized out>) at IO.c:200
        Buf = "DGxIx06gVZdtO0vSNRgttRS9lvQkaCOJ1CIHDEtuA5+UDAz35qisyf8I7JB9tAc3Sv9l8o5OFI37/AMcYoAzq3NEgsf7K1W9vLJbo2wi8tGkZB8zYP3SKw63NEmsjpWq2V3fJaNciLy3eN2B2tk/dBoAW90+xurCz1Kx/0OKaZreaOZy6xOACCCBkqQfQnjvUWuwTW8e"...
        ret = 0 '\000'
        io_key = 3
        conn = <optimized out>
        St = 0
#13 IO_callback (io=<optimized out>) at IO.c:273
        ret = <error reading variable ret (Cannot access memory at address 0x0)>
#14 0x0000051d54cbc659 in IO_fd_read_cb (fd=6, data=0x3) at IO.c:294
        io_key = 3
        io = 0x36
#15 0x0000051d54d5de12 in fl_wait(double) ()
No symbol table info available.
#16 0x0000051d54d2ed66 in Fl::wait(double) ()
No symbol table info available.
#17 0x0000051d54d2ef0b in Fl::run() ()
No symbol table info available.
#18 0x0000051d54c53ff8 in main ()
No symbol table info available.