segfault on example in manual

Reinhard Kotucha

1 Apr 2019 1 Apr '19

4:10 p.m.

Hi, when I run the example on page 261/262 of the LuaTeX Manual and the input file ("foo.pdf" in the example) doesn't exist, I get Segmentation fault (core dumped) on x86_64-linux. Regards, Reinhard -- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------

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luigi scarso

1 Apr 1 Apr

11:18 p.m.

On Tue, Apr 2, 2019 at 12:23 AM Reinhard Kotucha wrote:

...

Hi, when I run the example on page 261/262 of the LuaTeX Manual and the input file ("foo.pdf" in the example) doesn't exist, I get

Segmentation fault (core dumped)

on x86_64-linux.

Regards, Reinhard

-- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------ _______________________________________________ dev-luatex mailing list dev-luatex@ntg.nl https://mailman.ntg.nl/mailman/listinfo/dev-luatex

Confirmed. The test is local operatortable = { } operatortable.Do = function(scanner,info) local resources = info.resources if resources then local val = scanner:pop() local name = val[2] local xobject = resources.XObject print(info.space .. "Uses XObject " .. name) local resources = xobject.Resources if resources then local newinfo = { space = info.space .. " ", resources = resources, } pdfscanner.scan(entry, operatortable, newinfo) end end end local function Analyze(filename) local doc = pdfe.open(filename) if doc then local pages = doc.Pages for i=1,#pages do local page = pages[i] local info = { space = " " , resources = page.Resources, } print("Page " .. i) -- pdfscanner.scan(page.Contents,operatortable,info) pdfscanner.scan(page.Contents(),operatortable,info) end end end Analyze("foo.pdf") -- luigi

luigi scarso

2 Apr 2 Apr

12:50 a.m.

On Tue, Apr 2, 2019 at 7:18 AM luigi scarso wrote:

...

On Tue, Apr 2, 2019 at 12:23 AM Reinhard Kotucha wrote:

...
Hi, when I run the example on page 261/262 of the LuaTeX Manual and the input file ("foo.pdf" in the example) doesn't exist, I get

Segmentation fault (core dumped)

on x86_64-linux.

This is ok $ luatex --fmt=luatex-plain "test-plain.tex" \directlua{ local operatortable = { } operatortable.Do = function(scanner,info) local resources = info.resources if resources then local val = scanner:pop() local name = val[2] local xobject = resources.XObject print(info.space .. "Uses XObject " .. name) local resources = xobject.Resources if resources then local newinfo = { space = info.space .. " ", resources = resources, } pdfscanner.scan(entry, operatortable, newinfo) end end end local function Analyze(filename) local doc = pdfe.open(filename) if doc then local pages = doc.Pages for i=1,#pages do local page = pages[i] local info = { space = " " , resources = page.Resources, } print("Page " .. i) --[==[ pdfscanner.scan(page.Contents,operatortable,info)]==] pdfscanner.scan(page.Contents(),operatortable,info) end end end Analyze("foo.pdf") } \end -- luigi

Reinhard Kotucha

1:48 p.m.

On 2019-04-02 at 08:50:23 +0200, luigi scarso wrote:

...

On Tue, Apr 2, 2019 at 7:18 AM luigi scarso wrote:

On Tue, Apr 2, 2019 at 12:23 AM Reinhard Kotucha < reinhard.kotucha@web.de> wrote:

Hi, when I run the example on page 261/262 of the LuaTeX Manual and the input file ("foo.pdf" in the example) doesn't exist, I get

Segmentation fault (core dumped)

on x86_64-linux.

This is ok $ luatex --fmt=luatex-plain "test-plain.tex"

Hi Luigi, this works here too. I get: This is LuaTeX, Version 1.10.0 (TeX Live 2019) restricted system commands enabled. (./testpdfscanner.tex warning (pdfe lib): no valid pdf file 'foo.pdf' ) (see the transcript file for additional information) warning (pdf backend): no pages of output. Transcript written on testpdfscanner.log. I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here. Regards, Reinhard Core was generated by `./texlua ./testpdfscanner.lua'. Program terminated with signal 11, Segmentation fault. #0 0x00000000004c31e8 in tprint (sss=sss@entry=0x722ca6 "warning ") at ../../../texk/web2c/luatexdir/tex/printing.c:419 419 int newlinechar = new_line_char_par; (gdb) bt #0 0x00000000004c31e8 in tprint (sss=sss@entry=0x722ca6 "warning ") at ../../../texk/web2c/luatexdir/tex/printing.c:419 #1 0x0000000000490d37 in normal_warning (t=t@entry=0x7361e6 "pdfe lib", p=p@entry=0xc3b5c0 "no valid pdf file 'foo.pdf'") at ../../../texk/web2c/luatexdir/tex/errors.c:992 #2 0x0000000000490f15 in formatted_warning (t=t@entry=0x7361e6 "pdfe lib", fmt=fmt@entry=0x7361ef "no valid pdf file '%s'") at ../../../texk/web2c/luatexdir/tex/errors.c:1031 #3 0x0000000000525904 in pdfelib_open (L=0x1d97048) at ../../../texk/web2c/luatexdir/lua/lpdfelib.c:836 #4 0x0000000000642911 in luaD_precall (L=L@entry=0x1d97048, func=func@entry=0x1e61b10, nresults=nresults@entry=1) at ../../../libs/lua53/lua53-src/src/ldo.c:434 #5 0x000000000065586d in luaV_execute (L=L@entry=0x1d97048) at ../../../libs/lua53/lua53-src/src/lvm.c:1134 #6 0x0000000000642bdf in luaD_call (L=L@entry=0x1d97048, func=<optimized out>, nResults=<optimized out>) at ../../../libs/lua53/lua53-src/src/ldo.c:499 #7 0x0000000000642c31 in luaD_callnoyield (L=0x1d97048, func=<optimized out>, nResults=<optimized out>) at ../../../libs/lua53/lua53-src/src/ldo.c:509 #8 0x000000000064207c in luaD_rawrunprotected (L=L@entry=0x1d97048, f=f@entry=0x63a690 , ud=ud@entry=0x7ffcb9c7fbc0) at ../../../libs/lua53/lua53-src/src/ldo.c:142 #9 0x0000000000642efd in luaD_pcall (L=L@entry=0x1d97048, func=func@entry=0x63a690 , u=u@entry=0x7ffcb9c7fbc0, old_top=720, ef=<optimized out>) at ../../../libs/lua53/lua53-src/src/ldo.c:729 #10 0x000000000063bb2c in lua_pcallk (L=0x1d97048, nargs=nargs@entry=0, nresults=nresults@entry=0, errfunc=errfunc@entry=0, ctx=ctx@entry=0, k=k@entry=0x0) at ../../../libs/lua53/lua53-src/src/lapi.c:969 #11 0x000000000047bb29 in lua_initialize (ac=<optimized out>, av=<optimized out>) at ../../../texk/web2c/luatexdir/lua/luainit.c:1046 #12 0x0000000000445a09 in main (ac=<optimized out>, av=<optimized out>) at ../../../texk/web2c/luatexdir/luatex.c:588 (gdb) quit -- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------

luigi scarso

1:59 p.m.

On Tue, Apr 2, 2019 at 9:48 PM Reinhard Kotucha wrote:

...

On 2019-04-02 at 08:50:23 +0200, luigi scarso wrote:

...
On Tue, Apr 2, 2019 at 7:18 AM luigi scarso wrote:

On Tue, Apr 2, 2019 at 12:23 AM Reinhard Kotucha < reinhard.kotucha@web.de> wrote:

Hi, when I run the example on page 261/262 of the LuaTeX Manual and the input file ("foo.pdf" in the example) doesn't exist, I get

Segmentation fault (core dumped)

on x86_64-linux.

This is ok $ luatex --fmt=luatex-plain "test-plain.tex"

Hi Luigi, this works here too. I get:

This is LuaTeX, Version 1.10.0 (TeX Live 2019) restricted system commands enabled. (./testpdfscanner.tex warning (pdfe lib): no valid pdf file 'foo.pdf' ) (see the transcript file for additional information) warning (pdf backend): no pages of output. Transcript written on testpdfscanner.log.

I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here.

because the print of the warning requires a TeX state. texlua has only a Lua state. -- luigi

Reinhard Kotucha

2:17 p.m.

On 2019-04-02 at 21:59:21 +0200, luigi scarso wrote:

...

On Tue, Apr 2, 2019 at 9:48 PM Reinhard Kotucha wrote: I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here.

because the print of the warning requires a TeX state. texlua has only a Lua state.

Thanks for the info. I'll use lfs.isfile() then. Regards, Reinhard -- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------

Hironobu Yamashita

8 Apr 8 Apr

5:53 a.m.

Hi Luigi, On 2019-04-02 at 21:59:21 +0200, luigi scarso wrote:

...

On Tue, Apr 2, 2019 at 9:48 PM Reinhard Kotucha wrote: I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here.

because the print of the warning requires a TeX state. texlua has only a Lua state.

Do you have any plan of fixing this? If not, please consider the attached patch. Without this, even the simple file test.lua containing pdfe.open("foo.pdf") causes a segfault... Hironobu

luigi scarso

6:08 a.m.

On Mon, Apr 8, 2019 at 1:53 PM Hironobu Yamashita < h.y.acetaminophen@gmail.com> wrote:

...

Hi Luigi,

On 2019-04-02 at 21:59:21 +0200, luigi scarso wrote:

...
On Tue, Apr 2, 2019 at 9:48 PM Reinhard Kotucha
wrote: I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here.

because the print of the warning requires a TeX state. texlua has only a Lua state.

Do you have any plan of fixing this? If not, please consider the attached patch. Without this, even the simple file test.lua containing

pdfe.open("foo.pdf")

causes a segfault...

Yes I will fix it, unfortunately after TeXLive 2019 is closed. Thank you for the patch. -- luigi

Reinhard Kotucha

2:22 p.m.

On 2019-04-08 at 20:53:29 +0900, Hironobu Yamashita wrote:

...

Hi Luigi,

On 2019-04-02 at 21:59:21 +0200, luigi scarso wrote:

...
On Tue, Apr 2, 2019 at 9:48 PM Reinhard Kotucha wrote: I suppose that texlua crashes when trying to print the warning, see gdb output below. What I don't understand is is why luatex and texlua behave differently here.

because the print of the warning requires a TeX state. texlua has only a Lua state.

Do you have any plan of fixing this? If not, please consider the attached patch. Without this, even the simple file test.lua containing

pdfe.open("foo.pdf")

causes a segfault...

Thank you very much! Regards, Reinhard -- ------------------------------------------------------------------ Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ------------------------------------------------------------------

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segfault on example in manual

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