[Lazarus] Access violation in build_lcl_docs --outfmt chm

Andrew Haines AndrewD207 at aol.com
Fri Mar 2 00:15:39 CET 2012

On 03/01/12 13:51, Mattias Gaertner wrote:
> On Thu, 01 Mar 2012 17:31:47 +0100
> Thomas Moritz <thm_ml at thmoritz.de> wrote:
>> Hello,
>> this is the output:
>> HTML Files written. Collecting other files and compressing...this could take some time
>> Generating Table of contents...
>> Generating Index...
>> Finishing compressing...
>> Exception at 00000000004FFF6F: EAccessViolation:
>> Access violation.
>> 'lcl.chm' has 0 Byte
>> openSUSE 12.1 x86_64
>> fpc 2.7.1 svn 20450
>> lazarus svn 35641
> It is a bug in the 2.7.1 version of the chmwriter.
> Can you create a backtrace?
> Maybe Andrew Haines can help.

I managed to reproduce this. I cannot look into it for a couple of days
though. I wonder if something has changed in fpc because it worked until
I updated all of fpc but my chm folder was already up to date.

I got a backtrace by compiling the packages/chm and util/fpdoc with make

Program received signal SIGSEGV, Segmentation fault.
0x00000000005072e5 in WRITEHEADER (this=0x7ffff33f9c80,
ISPLACEHOLDER=false) at src/chmfiftimain.pas:291
291	  FHeaderRec.LeafNodeCount := TLeafNode(FActiveLeafNode).LeafNodeCount;
(gdb) bt
#0  0x00000000005072e5 in WRITEHEADER (this=0x7ffff33f9c80,
ISPLACEHOLDER=false) at src/chmfiftimain.pas:291
#1  0x00000000005078d8 in WRITETOSTREAM (this=0x7ffff33f9c80) at
#2  0x00000000004f111b in WRITEFIFTIMAIN (this=0x7ffff7f54420) at
#3  0x00000000004f16c2 in WRITEFINALCOMPRESSEDFILES
(this=0x7ffff7f54420) at src/chmwriter.pas:1365
#4  0x00000000004ef2d4 in GETDATA (this=0x7ffff7f54420, COUNT=65536,
BUFFER=0x7ffff2756050 '') at src/chmwriter.pas:674
#5  0x00000000004ef003 in _GETDATA (ARG=0x7ffff7f54420, COUNT=65536,
BUFFER=0x7ffff2756050) at src/chmwriter.pas:636
#6  0x000000000050523f in LZX_GET_CHARS (LZI=0x7ffff283fe40, N=65536,
BUF=0x7ffff2756050 '') at src/paslzxcomp.pas:467
#7  0x000000000050d4d9 in FILL_BLOCKBUF (LZI=0x7ffff283fe40,
MAXCHARS=65536) at src/paslznonslide.pas:174
#8  0x000000000050d92e in LZ_COMPRESS (LZI=0x7ffff283fe40, NCHARS=65536)
at src/paslznonslide.pas:430
#9  0x0000000000506780 in LZX_COMPRESS_BLOCK (LZXD=0x7ffff3ef47d0,
BLOCK_SIZE=65536, SUBDIVIDE=true (4294967295)) at src/paslzxcomp.pas:1000
#10 0x00000000004f0076 in STARTCOMPRESSINGSTREAM (this=0x7ffff7f54420)
at src/chmwriter.pas:915
#11 0x00000000004efbb5 in EXECUTE (this=0x7ffff7f54420) at
#12 0x0000000000481a8a in WRITEHTMLPAGES (this=0x7ffff39a3560) at
#13 0x000000000049168f in WRITEDOC (this=0x7ffff39a3560) at dw_html.pp:3455
#14 0x00000000004a1605 in CREATEOUTPUT (this=0x7ffff7f7e040,
APACKAGE=0x7ffff7f9e2e0, ENGINE=0x7ffff7f7e180) at mkfpdoc.pp:175
#15 0x00000000004a1cce in CREATEDOCUMENTATION (this=0x7ffff7f7e040,
APACKAGE=0x7ffff7f9e2e0, PARSEONLY=false) at mkfpdoc.pp:228
#16 0x0000000000402450 in DORUN (this=0x7ffff7f86040) at fpdoc.pp:359
#17 0x0000000000465d50 in CUSTAPP$_$TCUSTOMAPPLICATION_$__$$_RUN ()
#18 0x00000000004026d2 in main () at fpdoc.pp:375



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