Re: build errors: 9172 Broken pipe and 9173 Segmentation fault

[Andy Wingo]

Hi,

On Tue 29 Mar 2011 19:07, Douglas Mencken <address@hidden> writes:

> <mark_weaver> dougmencken: the real problem seems to be that an
> infinite recursion results while handling a string decoding error.  it
> is also curious why a decoding error is happening with uClibc that
> does not occur with glibc, but that's secondary.
> <mark_weaver> scm_from_locale_string calls scm_from_locale_stringn
> which calls scm_from_stringn (in your case UTF-8 presumably) which
> calls scm_decoding_error which calls scm_from_locale_string, ad
> infinitum.
> <mark_weaver> perhaps the decoding error handler is trying to print
> the erroneous string as part of its error message, or something.
> <mark_weaver> that would be my guess anyway.

I don't know what bug this is.

Your backtrace includes repeating lines line this:

#13263 0x480dc9cc in scm_from_locale_stringn (str=0x4812560c 
.¢€€€€.œ€€€€.±€€€€.¶€€€€.³€€€€.œ€€€€.±€€€€.´€€€€.³€€€€.œ€€€€.±€€€€.µ€€€€.µ€€€€.œ€€€€.±€€€€.³€€€€.·€€€€.œ€€€€.±€€€€.´€€€€.¶€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.µ€€€€.œ€€€€.±€€€€.³€€€€.·€€€€.œ€€€€.±€€€€.¶€€€€.³€€€€.œ€€€€.±€€€€.¶€€€€.´€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.µ€€€€.±€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.œ€€€€.±€€€€.´€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.¢€€€€,
 len=<value optimized out>) at strings.c:1535
#13264 0x480dc9fc in scm_from_locale_string (str=<value optimized out>) at 
strings.c:1529
#13265 0x480dca58 in scm_decoding_error (subr=<value optimized out>, err=38, 
message=0x48125a54 
.¢€€€€.œ€€€€.±€€€€.µ€€€€.±€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.œ€€€€.±€€€€.¶€€€€.°€€€€.œ€€€€.±€€€€.¶€€€€.µ€€€€.œ€€€€.±€€€€.¶€€€€.´€€€€.œ€€€€.°€€€€.´€€€€.°€€€€.œ€€€€.±€€€€.µ€€€€.´€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.´€€€€.³€€€€.œ€€€€.±€€€€.´€€€€.±€€€€.œ€€€€.±€€€€.µ€€€€.´€€€€.œ€€€€.±€€€€.´€€€€.µ€€€€.œ€€€€.°€€€€.´€€€€.°€€€€.œ€€€€.±€€€€.´€€€€.³€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.œ€€€€.±€€€€.¶€€€€.¶€€€€.œ€€€€.±€€€€.´€€€€.µ€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.¶€€€€.³€€€€.œ€€€€.±€€€€.µ€€€€.±€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.œ€€€€.°€€€€.´€€€€.°€€€€.œ€€€€.±€€€€.´€€€€.µ€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.¢€€€€,
 port=<value optimized out>) at strings.c:1438
#13266 0x480dcce4 in scm_from_stringn (str=0x4812560c 
.¢€€€€.œ€€€€.±€€€€.¶€€€€.³€€€€.œ€€€€.±€€€€.´€€€€.³€€€€.œ€€€€.±€€€€.µ€€€€.µ€€€€.œ€€€€.±€€€€.³€€€€.·€€€€.œ€€€€.±€€€€.´€€€€.¶€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.µ€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.µ€€€€.œ€€€€.±€€€€.³€€€€.·€€€€.œ€€€€.±€€€€.¶€€€€.³€€€€.œ€€€€.±€€€€.¶€€€€.´€€€€.œ€€€€.±€€€€.¶€€€€.²€€€€.œ€€€€.±€€€€.µ€€€€.±€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.œ€€€€.±€€€€.´€€€€.·€€€€.œ€€€€.±€€€€.µ€€€€.¶€€€€.¢€€€€,
 len=<value optimized out>, encoding=<value optimized out>, handler=<value 
optimized out>) at strings.c:1494

But the only calls to scm_from_locale_string in scm_decoding_error are
on string literals:

   scm_from_locale_string (subr),
   scm_from_locale_string (message),

But the argument to scm_from_locale_stringn does not appear to be one of
the known strings that it could be.

In any case, it does seem more correct to use a fixed locale for these
strings, so I have changed it to use latin1 strings.

Regards,

Andy
-- 
http://wingolog.org/