[Debian-med-packaging] Bug#907624: Help for SIGSEGV in test suite needed when built with gcc 8.2 what works nicely with gcc 6.3

[Andrey Rahmatullin]

On Wed, Jan 09, 2019 at 10:49:48PM +0100, Andreas Tille wrote:
> > > to find the exact code line[2] where the SIGSEGV is thrown.  It turns out
> > > that the elements of a structure are not accessible:
> > > 
> > >    (gdb) print entry->offset
> > >    Cannot access memory at address 0x7
> > It's because entry is 0x7.
> 
> When I was running the code with some more debugging info activated[1]
> I had pretty valid looking adresses 0x555666 
And still SEGV?

> > > The values of the structure are set in line 350[3] and are OK there.
> > The problem is not about the structure fields but about the structure
> > pointer itself though.
> > ...
> > You need to find out why one of the tree nodes has an invalid address.
> 
> Can you propose any means to find this out?
As usual: reading the code, debugging, printfs. Address sanitizer and/or
valgrind may or may not help too.

> I have no idea about specific compiler differences.
I don't think pondering compiler differences can be helpful here, it's
most likely bad code that is working file with some compilers but is still
bad code.


-- 
WBR, wRAR
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