linux-kernel - loop device: print_req_error - blk_update

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Date:   Mon, 10 Sep 2018 16:33:23 +0200
From:   Egerváry Gergely <gergely@...rvary.hu>
To:     linux-kernel@...r.kernel.org
Subject: loop device: print_req_error - blk_update_request I/O error

Hi,

I'm mounting an ext4 filesystem residing on an AHCI SATA disk via loop:
   losetup -o 64424509440 --sizelimit 34359738368 /dev/loop0 /dev/sda
   mount -t ext4 /dev/loop0 /mnt

Works perfectly on <= 4.4.155 (latest version on 4.4.x longterm branch)

On 4.9.126 (longterm branch) I get these errors:
   blk_update_request: I/O error, /dev/loop0, sector 23778144
   blk_update_request: I/O error, /dev/loop0, sector 23789056
   blk_update_request: I/O error, /dev/loop0, sector 23791038
   ...

On 4.14.69 (longterm branch):
   print_req_error: I/O error, /dev/loop0, sector 22685550
   print_req_error: I/O error, /dev/loop0, sector 22696582
   print_req_error: I/O error, /dev/loop0, sector 22675034
   ...

and even on the latest stable 4.18.7:
   print_req_error: I/O error, /dev/loop0, sector 21044836
   print_req_error: I/O error, /dev/loop0, sector 22058444
   print_req_error: I/O error, /dev/loop0, sector 22858336
   ...

That's 100% reproducible on all my computers. They are amd64 desktop PCs
running unpatched vanilla kernels from kernel.org.

Any ideas?

I can provide more details if requested (.config, dmesg, etc.)
Thanks in advance.
-- 
Gergely EGERVARY