linux-kernel - Re: [syzbot] upstream test error: KASAN: invalid-access Read in __entry_tramp_text

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Message-ID: <YVRRWzXqhMIpwelm@hirez.programming.kicks-ass.net>
Date:   Wed, 29 Sep 2021 13:43:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+488ddf8087564d6de6e2@...kaller.appspotmail.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        will@...nel.org, x86@...nel.org
Subject: Re: [syzbot] upstream test error: KASAN: invalid-access Read in
 __entry_tramp_text_end

On Wed, Sep 29, 2021 at 11:37:30AM +0100, Mark Rutland wrote:

> > This is because _ASM_EXTABLE only generates data for another section.
> > There doesn't need to be code continuity between these two asm
> > statements.
> 
> I think you've missed my point. It doesn't matter that the
> asm_volatile_goto() doesn't contain code, and this is solely about the
> *state* expected at entry/exit from each asm block being different.

Urgh.. indeed :/