linux-kernel - Re: objtool segfault with ORC unwinder enabled

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Message-ID: <20180103111941.GB5412@kroah.com>
Date:   Wed, 3 Jan 2018 12:19:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Markus <M4rkusXXL@....de>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: objtool segfault with ORC unwinder enabled

On Wed, Jan 03, 2018 at 11:49:08AM +0100, Markus wrote:
> 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

Random web links on mailing lists don't help much, please put the
information here in the email.

> objtool will segfault because a NULL pointer is dereferenced.

And how are you reproducing this?

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

What .config is triggering this problem?

And does this show up on 4.14.11, and 4.15-rc6?

thanks,

greg k-h