On Fri, Sep 09, 2011 at 04:34:54PM +0200, Oliver Lehmann wrote:
> Kostik Belousov <kostik...@gmail.com> wrote:
> >On Fri, Sep 09, 2011 at 04:19:42PM +0200, Oliver Lehmann wrote:
> >>(gdb) bt
> >>#0  0x00000000004d24c6 in tzload ()
> >
> >Try to do "disas 0x4d24c6 0x4d24c6+30" from gdb prompt with the loaded 
> >core.
> (gdb) disas 0x4d24c6 0x4d24c6+30
> Dump of assembler code from 0x4d24c6 to 0x4d24e4:
> 0x00000000004d24c6 <tzload+86>: callq  0x4db370 <issetugid>
> 0x00000000004d24cb <tzload+91>: test   %eax,%eax
> 0x00000000004d24cd <tzload+93>: jne    0x4d25e0 <tzload+368>
> 0x00000000004d24d3 <tzload+99>: movzbl (%rbx),%ebp
> 0x00000000004d24d6 <tzload+102>:        cmp    $0x3a,%bpl
> 0x00000000004d24da <tzload+106>:        jne    0x4d24e3 <tzload+115>
> 0x00000000004d24dc <tzload+108>:        add    $0x1,%rbx
> 0x00000000004d24e0 <tzload+112>:        movzbl (%rbx),%ebp
> 0x00000000004d24e3 <tzload+115>:        cmp    $0x2f,%bpl
> End of assembler dump.

Ok, please do the following:
run cvsup under the gdb. When SIGSEGV is raised, from the gdb prompt, do:
1. info registers $rsp
2. info program
        This should print you the pid of the process, then do
3. shell procstat -v <pid>

I suspect that modula 3 system uses the kind of green threads, and
the default thread stack size is simply too small for amd64. This is
consistent with SIGILL when running standalone, but SIGSEGV under

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