linux-kernel - Re: qemu-arm: zram: mkfs.ext4 : Unable to handle kernel NULL pointer dereference at virtual address 00000140

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Message-ID: <YqbtH9F47dkZghJ7@google.com>
Date:   Mon, 13 Jun 2022 16:54:07 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Minchan Kim <minchan@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        regressions@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Nitin Gupta <ngupta@...are.org>
Subject: Re: qemu-arm: zram: mkfs.ext4 : Unable to handle kernel NULL pointer
 dereference at virtual address 00000140

Hello,

On (22/06/12 20:56), Naresh Kamboju wrote:
> 
> I have tested this patch and the reported issue got resolved [1].
>

Many thanks for the tests.

Quite honestly I was hoping that the patch would not help :) Well, ok,
we now know that it's mapping area lock and the lockdep part of its
memory is zero-ed out. The question is - "why?" It really should not
be zeroed out.