[Bug middle-end/68117] [6 Regression] error: invalid PHI argument <<< Unknown tree: <invalid tree code> >>>

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68117

--- Comment #15 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Joost VandeVondele from comment #14)
> (In reply to Markus Trippelsdorf from comment #13)
> > *** Bug 68127 has been marked as a duplicate of this bug. ***
> 
> just FYI, for me (PR68127) the issue pops up in a non-deterministic way, I
> don't know why, but this might be useful to keep in mind while reducing /
> bisecting.

Yes. This is the reason why my previous bisecting attempts landed on 
commits that have probably nothing to do with this nasty heisenbug.