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From: "hubicka at kam dot mff.cuni.cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/103652] Producing profile with -O2 -flto and
 trying to consume it with -O3 -flto leads to ICEs on indirect call profiling
Date: Mon, 13 Dec 2021 10:44:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103652

--- Comment #4 from hubicka at kam dot mff.cuni.cz ---
>=20
> Well, I'm specifically speaking about:
> error: the control flow of function =E2=80=98BZ2_compressBlock=E2=80=99 d=
oes not match its
> profile data (counter =E2=80=98arcs=E2=80=99)=20
>=20
> this type of errors should not happen even in a multi-threaded programs.

There are some cases where I see even those on clang build - I am not
sure how that happens (if it is configury difference or generated code
or gcc bug) It is on my TODO to analyse...

In any case we should never ICE on malformed gcda files. Especially not
by buffer overflow :)
>=20
> > I think you can produce testcase easily by making a function with one
> > indirect call for train run and many indirect calls in profile-use run.
> >=20
> > I have patch to avoid the buffer overflow - can send it after getting to
> > office.
>=20
> Sure, please send it.
Attached.

Honza=