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Re: texinfo-6.0.91 pretest

From: Eli Zaretskii
Subject: Re: texinfo-6.0.91 pretest
Date: Fri, 01 Jan 2016 16:53:24 +0200

> Date: Fri, 1 Jan 2016 12:42:54 +0000
> From: Gavin Smith <address@hidden>
> Cc: Texinfo <address@hidden>
> On 1 January 2016 at 11:08, Eli Zaretskii <address@hidden> wrote:
> > Or maybe you have other ideas for possible reasons.  (I don't have a
> > debuggable version of Perl, so I cannot run it under a debugger to see
> > where and why it fails, exactly.)
> Also if it dumps core, the backtrace could show where it crashed. That
> could be meaningful, or could be completely unhelpful, it's hard to
> know which.

There are no core dumps on Windows.  If I tell Windows to attach a JIT
debugger to Perl when it crashes, I get this information:

  perl.exe caused an Access Violation at location 7c83110c in module 
kernel32.dll Reading from location 01a4ffff.

  eax=00000000 ebx=00000008 ecx=01a4ffff edx=00000002 esi=00000000 edi=00000000
  eip=7c83110c esp=0022f9a8 ebp=0022f9c0 iopl=0         nv up ei ng nz ac pe cy
  cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000293

  Call stack:
  7C83110C  kernel32.dll:7C83110C  FindActCtxSectionGuid
  7C8310BA  kernel32.dll:7C8310BA  FindActCtxSectionGuid
  7C831007  kernel32.dll:7C831007  FindActCtxSectionGuid
  687435E2  XSParagraph.dll:687435E2  mbrtowc
  687447A4  XSParagraph.dll:687447A4  xspara__add_next
  6874483B  XSParagraph.dll:6874483B  xspara_add_next
  68742722  XSParagraph.dll:68742722  

My translation of the 1st line is that the code tried to read from an
address that is outside the program's address space.

Any ideas?  There are several calls to mbrtowc in xspara__add_next.

Btw, why is mbrtowc called with its 3rd argument 10?  There are no
such long multibyte sequences, AFAIK, and the value should IMO never
be greater than the actual number of bytes in the variable whose
address is passed as the 2nd arg.  No?

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