[Sbcl-devel] Weird problem with posix environment

[Daniel B. <da...@te...>]

I think we may be suffering from libc breakage.  Since I upgraded to
the latest debian unstable my previously compiled sbcl binaries are
failing run-program.test.sh with a segmentation fault; it appears to
be related to the alien variable sb-impl::envirion

* (in-package :sb-impl)

#<PACKAGE "SB-IMPL">
* (c-strings->string-list environ)

("PWD=/home/dan/src/sourceforge/sbcl" "XAUTHORITY=/home/dan/.Xauthority"
[...]

 ... but ...

* (posix-environ)

debugger invoked on condition of type SIMPLE-ERROR:
  segmentation violation at #X10453F6
[...]
0] frame 6
(C-STRINGS->STRING-LIST #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #X40128648>)
6] environ

#<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #XBFFFFB88>

whatever is being passed to C-STRINGS->STRING-LIST is not the same
thing as SB-IMPL:POSIX-ENVIRON

Rerunning make-target-2.sh fixes it.  Anyone (Peter?) want to work out
how we can make binaries that don't break this way?  My guess would be
that (def-alien-variable "thing from a shared library") shouldn't be
allowed into code that's going to be dumped into a new core.


-dan

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