Fwd: Buildbot failure in Wildebeest Builder on whole buildset

[Mark Wielaard]

Hi Tom,

On Thu, 2021-03-25 at 09:50 +0100, Tom de Vries wrote:
> I've just committed patch "Move hardlink handling out of dwz
> function"
> and there's this buildbot failure.
> 
> Is there something easy that you can do to find out if this is a
> fluke
> or not, f.i. retry the build for that bot?

I logged into the buildbot worker and did a dwz build myself.
make check does produce 32 unexpected failures.
Removing the last commit makes everything pass.
Adding the commit again produces the failures again.
It isn't a fluke.

The problem is simply that:
cp hello 1
dwz 1

Makes dwz produce an exit code of 1 which seems to be interpreted as
child process exited abnormally in a make check run.

running under valgrind --track-origins=yes gives:

==31313== Conditional jump or move depends on uninitialised value(s)
==31313==    at 0x127974: dwz (dwz.c:15287)
==31313==    by 0x10BB7C: dwz_with_low_mem (dwz.c:16227)
==31313==    by 0x10BB7C: dwz_one_file (dwz.c:16253)
==31313==    by 0x10BB7C: main (dwz.c:16532)
==31313==  Uninitialised value was created by a stack allocation
==31313==    at 0x10B59B: main (dwz.c:16513)

I haven't tracked down what res->res precisely depends on that doesn't
have a defined value.

Cheers,

Mark