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From:   Pintu Agarwal <pintu.ping@gmail.com>
Date:   Fri, 17 Mar 2023 16:49:28 +0530
Message-ID: <CAOuPNLiu+40HREtXFL_yMaXiaRtnZSbW9VvZRZmEpNXvZWzaQw@mail.gmail.com>
Subject: Re: ubi0 error: ubi_open_volume: cannot open device 0, volume 6,
 error -16
To:     open list <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-mtd <linux-mtd@lists.infradead.org>
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Hi,

Sorry, for missing the subject last time.

On Wed, 15 Feb 2023 at 23:06, Pintu Agarwal <pintu.ping@gmail.com> wrote:
>
> Hi,
>
> We are seeing below "ubi errors" during booting.
> Although this does not cause any functionality break, I am wondering
> if there is any way to fix it ?
> We are using Kernel 4.14 with UBI and squashfs (ubiblock) as volumes,
> and with systemd.
>
> Anybody have experienced the similar logs with ubi/squashfs and
> figured out a way to avoid it ?
> It seems like these open volumes are called twice, thus error -16
> indicates (device or resource busy).
> Or, are these logs expected because of squashfs or ubiblock ?
> Or, do we need to add anything related to udev-rules ?
>
> {
> ....
> [  129.394789] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 6, error -16
> [  129.486498] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 7, error -16
> [  129.546582] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 8, error -16
> [  129.645014] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 9, error -16
> [  129.676456] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 6, error -16
> [  129.706655] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 10, error -16
> [  129.732740] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 7, error -16
> [  129.811111] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 8, error -16
> [  129.852308] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 9, error -16
> [  129.923429] ubi0 error: ubi_open_volume: cannot open device 0,
> volume 10, error -16
>
> }
>

I see that the errors are reported by systemd-udevd and other processes.
Is there a way to fix it by some means ?
These logs actually consume lots of boot up time...

[   54.300726] ubi0 error: ubi_open_volume: comm: systemd-udevd, pid:
1460, cannot open device 0, volume 4, error -16
[   54.507095] ubi0 error: ubi_open_volume: comm: systemd-udevd, pid:
1469, cannot open device 0, volume 5, error -16
[   54.509816] ubi0 error: ubi_open_volume: comm: systemd-udevd, pid:
1465, cannot open device 0, volume 6, error -16
[   54.650627] ubi0 error: ubi_open_volume: comm: systemd-udevd, pid:
1469, cannot open device 0, volume 7, error -16
[   54.680203] ubi0 error: ubi_open_volume: comm: systemd-udevd, pid:
1445, cannot open device 0, volume 8, error -16
[   56.311902] ubi0 error: ubi_open_volume: comm: mtd_probe, pid:
2042, cannot open device 0, volume 4, error -16
[   56.795532] ubi0 error: ubi_open_volume: comm: mtd_probe, pid:
2043, cannot open device 0, volume 5, error -16
[   57.087962] ubi0 error: ubi_open_volume: comm: mtd_probe, pid:
2044, cannot open device 0, volume 6, error -16
[   57.130853] ubi0 error: ubi_open_volume: comm: mtd_probe, pid:
2047, cannot open device 0, volume 8, error -16
[   57.345761] ubi0 error: ubi_open_volume: comm: mtd_probe, pid:
2046, cannot open device 0, volume 7, error -16


Thanks,
Pintu