linux-kernel - Re: [bug report]nvme0: Admin Cmd(0x6), I/O Error (sct 0x0 / sc 0x2) MORE DNR observed during blktests

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Message-ID: <Ykyf5Zuz1W8yHhNY@zx2c4.com>
Date:   Tue, 5 Apr 2022 22:00:37 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Yi Zhang <yi.zhang@...hat.com>, alan.adamson@...cle.com
Cc:     "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        Sagi Grimberg <sagi@...mberg.me>, alan.adamson@...cle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [bug report]nvme0: Admin Cmd(0x6), I/O Error (sct 0x0 / sc 0x2)
 MORE DNR observed during blktests

Hi Alan,

I too am seeing this. Tracking it down to the same commit, I decided to
enable NVME_VERBOSE_ERRORS to get some more information. Now on boot and
everytime I wake up from sleep, I see:

[   89.098578] nvme nvme0: Shutdown timeout set to 8 seconds
[   89.098683] nvme0: Identify(0x6), Invalid Field in Command (sct 0x0 / sc 0x2) MORE
[   89.119363] nvme nvme0: 16/0/0 default/read/poll queues

With that middle line in red.

Question is: is this actually an error? If not, maybe it shouldn't be
printed as a KERN_ERR. And if it's printed as a KERN_INFO, maybe it
should only do so when CONFIG_NVME_VERBOSE_ERRORS=y? Or do you think
there is actually some other diagnostic value in having this print
always?

Using a Samsung SSD 970 EVO Plus 2TB, firmware version 2B2QEXM7, in case
that's useful info.

I also noticed a ~2 second boot delay on 5.18-rc1:

[    0.917631] pstore: Using crash dump compression: deflate
[    0.917807] Key type encrypted registered
[    0.951840] ACPI: battery: Slot [BAT0] (battery present)
[    3.146765] nvme nvme0: Shutdown timeout set to 8 seconds
[    3.146918] nvme0: Identify(0x6), Invalid Field in Command (sct 0x0 / sc 0x2) MORE
[    3.188852] nvme nvme0: 16/0/0 default/read/poll queues
[    3.198163]  nvme0n1: p1 p2
[    3.199554] Freeing unused kernel image (initmem) memory: 12952K

I haven't looked into it much, but I assume it's also NVMe related? Or
maybe the vconsole is just initializing faster so I see text where
before I didn't. Not sure.

Regards,
Jason