linux-kernel - Re: [llc_ui_release] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004

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Date:   Sun, 29 Apr 2018 20:16:31 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, xiaolou4617@...il.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LKP <lkp@...org>
Subject: Re: [llc_ui_release] BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000004

On Sun, Apr 29, 2018 at 03:30:48AM +0000, Linus Torvalds wrote:
>On Sat, Apr 28, 2018 at 7:12 PM Fengguang Wu <fengguang.wu@...el.com> wrote:
>
>> FYI this happens in mainline kernel 4.17.0-rc2.
>> It looks like a new regression.
>
>> It occurs in 5 out of 5 boots.
>
>> [main] 375 sockets created based on info from socket cachefile.
>> [main] Generating file descriptors
>> [main] Added 83 filenames from /dev
>> udevd[507]: failed to execute '/sbin/modprobe' '/sbin/modprobe -bv
>platform:regulatory': No such file or directory
>> [  372.057947] caif:caif_disconnect_client(): nothing to disconnect
>> [  372.082415] BUG: unable to handle kernel NULL pointer dereference at
>0000000000000004
>
>I think this is fixed by commit 3a04ce7130a7 ("llc: fix NULL pointer deref
>for SOCK_ZAPPED")

Confirmed. Sorry for the late report!

Regards,
Fengguang