linux-kernel - Re: Kernel BUG at fs/namei.c:248

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Date:   Mon, 24 Jul 2017 14:59:54 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     linux-fsdevel@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: Kernel BUG at fs/namei.c:248

This bug still occurring on linux-next : 4.13.0-rc2-next-20170724.

>>> [ 1245.412625] kernel BUG at
>>> /srv/oe/build/tmp-rpb-glibc/work-shared/hikey/kernel-source/fs/namei.c:248!
>>
>> Interesting... Looks like double-put or memory corruptor of some sort.
>> Nothing obvious jumps out at the first glance; I'll look into that when
>> I get back to better connectivity tonight.

[ 1233.512841] kernel BUG at
/srv/oe/build/tmp-rpb-glibc/work-shared/hikey/kernel-source/fs/namei.c:248!
zram load module [ 1233.522161] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
successful
set m[ 1233.529054] Modules linked in: zram lzo test_printf algif_hash
af_alg adv7511 kirin_drm drm_kms_helper dw_drm_dsi drm asix usbnet
fuse [last unloaded: zram]
[ 1233.544586] CPU: 0 PID: 14163 Comm: systemd-udevd Not tainted
4.13.0-rc2-next-20170724 #1

LAVA test job id,
https://lkft.validation.linaro.org/scheduler/job/15352#L3402

>
> I am able to reproduce this BUG by running zram test cases multiple
> times in a row.
> http://people.linaro.org/~naresh.kamboju/zram.tar.gz
>
> Ref:
> LKFT: linux-mainline: Kernel BUG at fs/namei.c:248
> https://bugs.linaro.org/show_bug.cgi?id=3140