Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 24 Mar 2020 22:13:03 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Josh Poimboeuf <jpoimboe@redhat.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        andreyknvl@google.com, aryabinin@virtuozzo.com
Subject: Re: linux-next: Tree for Mar 20 (objtool warnings)
Message-ID: <20200324211303.GQ2452@worktop.programming.kicks-ass.net>
References: <20200320201539.3a3a8640@canb.auug.org.au>
 <ca0078e2-89b5-09a7-f61e-7f2906900622@infradead.org>
 <20200324164709.ux4riz7v7uy32nlj@treble>
 <39035493-9d5b-9da3-10d4-0af5d1cdb32a@infradead.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <39035493-9d5b-9da3-10d4-0af5d1cdb32a@infradead.org>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, Mar 24, 2020 at 10:53:05AM -0700, Randy Dunlap wrote:
> >> kernel/kcov.o: warning: objtool: __sanitizer_cov_trace_pc()+0x89: call to __ubsan_handle_load_invalid_value() with UACCESS enabled
> >>
> 
> config-r1510 is attached.
> and kcov.o is attached.

I'm thinking this is because of commit:

  0d6958a70483 kcov: collect coverage from interrupts

Which has:

@@ -1230,6 +1230,9 @@ struct task_struct {

+       bool                            kcov_softirq;

@@ -145,9 +157,10 @@ static notrace bool check_kcov_mode(enum kcov_mode needed_mode, struct task_stru

+       if (!in_task() && !(in_serving_softirq() && t->kcov_softirq))

And this __ubsan_handle_load_invalid_value() is verifying a bool is 0,1.

Another reason to hate on _Bool I suppose...

Let me see what to do about that... :/