linux-kernel - objtool segfault with ORC unwinder enabled

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Message-ID: <1537667.mbZVOcHbLR@markus>
Date:   Wed, 03 Jan 2018 11:49:08 +0100
From:   Markus <M4rkusXXL@....de>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: objtool segfault with ORC unwinder enabled

Hello!

ORC unwinder is enabled in stable for wider testing but still at least one bug 
is open:
https://bugzilla.kernel.org/show_bug.cgi?id=197035

objtool will segfault because a NULL pointer is dereferenced.

Is a NULL pointer sym valid?
If a NULL pointer is invalid, it has to be checked why it is sometimes NULL.

Thank you!
Markus