linux-kernel - Re: [BUG] Loopback devices with 4k logical block size are not automatically scanned for GPT partitions

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Message-ID: <CACVXFVMEgKEUQE8ALCjEvhxMtEzFYyP8QUM2ds8-Uw=x7USFAg@mail.gmail.com>
Date:   Thu, 9 Aug 2018 16:10:47 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Andrew Jeddeloh <andrew.jeddeloh@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: [BUG] Loopback devices with 4k logical block size are not
 automatically scanned for GPT partitions

On Thu, Aug 9, 2018 at 7:30 AM, Andrew Jeddeloh
<andrew.jeddeloh@...hat.com> wrote:
> I think I found a bug with partition scanning/loopback devices with 4k
> logical sectors. It affects 4.14.x and 4.17.x kernels (and presumably
> others). I've also filed the bug on the kernel bugzilla:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=200749
>
> Copied from the bugzilla report:
>
> Loop devices with the logical sector size set to 4096 do not
> autodetect partitions when attached. It may be the case for devices
> with 4k logical sectors in general, but I do not have hardware to test
> that. I have not tested with non-GPT disks.

You may setup 4k sector-size with scsi_debug or qemu virtio-scsi,
then try to reproduce on these devices.

Cc block list.


Thanks,
Ming Lei