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Date:   Thu, 16 May 2019 10:51:48 +0100
From:   Mark Brown <broonie@...nel.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     axel.lin@...ics.com, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, albeu@...e.fr,
        lorenzo.bianconi@...hat.com
Subject: Re: [PATCH] spi: bitbang: Fix NULL pointer dereference in
 spi_unregister_master

On Thu, May 16, 2019 at 03:56:56PM +0800, YueHaibing wrote:

> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
> Call Trace:
>  dump_stack+0xa9/0x10e
>  ? __list_del_entry_valid+0x45/0xd0
>  ? __list_del_entry_valid+0x45/0xd0
>  __kasan_report+0x171/0x18d
>  ? __list_del_entry_valid+0x45/0xd0
>  kasan_report+0xe/0x20

Please think hard before including complete backtraces in upstream
reports, they are very large and contain almost no useful information
relative to their size so often obscure the relevant content in your
message. If part of the backtrace is usefully illustrative then it's
usually better to pull out the relevant sections.

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