linux-kernel - Re: WARNING: syz-executor still has locks held!

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Message-ID: <20190321172833.GB12297@redhat.com>
Date:   Thu, 21 Mar 2019 18:28:33 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     syzbot <syzbot+b70f2aabc707c69c9239@...kaller.appspotmail.com>,
        chanho.min@....com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, pavel@....cz,
        rafael.j.wysocki@...el.com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, Ingo Molnar <mingo@...e.hu>
Subject: Re: WARNING: syz-executor still has locks held!

On 03/20, Michal Hocko wrote:
>
> So we need
> freezable_schedule_unsafe unsafe here to workaround the original problem
> and do not trigger the warning.

Yes, but note the comment above freezable_schedule_unsafe() ;)

that is why I didn't even try to suggest to use _unsafe() instead of reverting.

And to remind, until we solve the problem with cred_guard_mutex the freezer
can fail anyway although much less likely.

Oleg.