linux-kernel - Re: [LKP] [mtd] c4dfa25ab3: kernel_BUG_at

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Message-ID: <CAJZ5v0hXEqtaiV56sGCOd1VzsRETkS39YiLV-OfnFWiZH4tcAQ@mail.gmail.com>
Date:   Wed, 2 Jan 2019 22:44:50 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Richard Weinberger <richard@....at>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alban Bedel <albeu@...e.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>
Subject: Re: [LKP] [mtd] c4dfa25ab3: kernel_BUG_at_fs/sysfs/file.c

On Wed, Jan 2, 2019 at 8:53 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:

[cut]

> Greg, Rafael: it does strike me that the "BUG_ON()" in
> sysfs_create_file_ns() could easily have been a
>
>         if (WARN_ON(..))
>                 return -EINVAL;
>
> which would have made the machine boot and probably make things easier
> for normal users to report. The kernel test robot doesn't care, but
> non-booting kernels are usually not nice to debug or report for normal
> human beings..

I agree.

This isn't a good enough reason to crash the kernel IMO.

Cheers,
Rafael