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Date:   Sun, 24 May 2020 10:38:02 -0700
From:   Joe Perches <>
To:     Tetsuo Handa <>,
        Andrew Morton <>
Cc:, Dmitry Vyukov <>,
        Ondrej Mosnacek <>,
        Petr Mladek <>,
        Sergey Senozhatsky <>,
        Steven Rostedt <>
Subject: Re: [PATCH] twist: allow converting pr_devel()/pr_debug() into

On Sun, 2020-05-24 at 23:50 +0900, Tetsuo Handa wrote:
> syzbot found a NULL pointer dereference bug inside mptcp_recvmsg() due to
> ssock == NULL, but this bug manifested inside selinux_socket_recvmsg()
> because pr_debug() was no-op [1].
>   pr_debug("fallback-read subflow=%p",
>            mptcp_subflow_ctx(ssock->sk));
>   copied = sock_recvmsg(ssock, msg, flags);

> Since console loglevel used by syzkaller will not print KERN_DEBUG
> messages to consoles, always evaluating pr_devel()/pr_debug() messages
> will not cause too much console output. Thus, let's allow fuzzers to
> always evaluate pr_devel()/pr_debug() messages.

While I think this is rather unnecessary,
what about dev_dbg/netdev_dbg/netif_dbg et al ?

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