* loop device: print_req_error - blk_update_request I/O error
@ 2018-09-10 14:33 Egerváry Gergely
2018-09-12 18:05 ` Egerváry Gergely
0 siblings, 1 reply; 2+ messages in thread
From: Egerváry Gergely @ 2018-09-10 14:33 UTC (permalink / raw
To: linux-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: loop device: print_req_error - blk_update_request I/O error
2018-09-10 14:33 loop device: print_req_error - blk_update_request I/O error Egerváry Gergely
@ 2018-09-12 18:05 ` Egerváry Gergely
0 siblings, 0 replies; 2+ messages in thread
From: Egerváry Gergely @ 2018-09-12 18:05 UTC (permalink / raw
To: linux-kernel
Answering to myself:
It looks like ext4 lazy init does not play well with loop device.
If the ext4 filesystem was previously created with lazy init there are
I/O errors. Disabling lazy init fixes problem. Bug or feature?
Thanks,
> 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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-09-10 14:33 loop device: print_req_error - blk_update_request I/O error Egerváry Gergely
2018-09-12 18:05 ` Egerváry Gergely
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