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Sender: Guenter Roeck <groeck7@gmail.com>
Subject: Re: Linux 5.14-rc1
To:     Christoph Hellwig <hch@lst.de>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jens Axboe <axboe@kernel.dk>
References: <CAHk-=wjB5XBk4obhMPfrU3mnOakV9VgHAYOo-ZGJnB2X0DnBWA@mail.gmail.com>
 <20210712015619.GA3547193@roeck-us.net> <20210712041423.GA97217@roeck-us.net>
 <20210712052046.GB8042@lst.de>
From:   Guenter Roeck <linux@roeck-us.net>
Message-ID: <0cf6d000-f886-4e99-2e80-78da4ae9367d@roeck-us.net>
Date:   Mon, 12 Jul 2021 06:53:32 -0700
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On 7/11/21 10:20 PM, Christoph Hellwig wrote:
> On Sun, Jul 11, 2021 at 09:14:23PM -0700, Guenter Roeck wrote:
>> My guess was correct. Bisect points to the above commit. Bisect log as well
>> as complete backtrace and example qemu command attached.
>>
>> Copying Christoph and Jens.
> 
> This should fіx it:
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 6d2d63629a90..b8d55af763f9 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -98,11 +98,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
>   MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
>   MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
>   
> -#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
>   #define SD_MINORS	16
> -#else
> -#define SD_MINORS	0
> -#endif
>   
>   static void sd_config_discard(struct scsi_disk *, unsigned int);
>   static void sd_config_write_same(struct scsi_disk *);
> 

Yes, that fixes the problem for me.

Tested-by: Guenter Roeck <linux@roeck-us.net>

Thanks,
Guenter