Re: Sd card race on resume with filesystem errors (possible data loss?)

[Sergio Callegari <sergio.callegari@gmail.com>]

On 09/01/2026 21:57, Bart Van Assche wrote:
> 
> Please post the patch on the linux-scsi mailing list if you want it
> included in the upstream kernel.
> 

Hi and thanks.
Before posting the patch, I would like to provide more info about the 
situation. This is what I am experiencing after resume from sleep (as 
seen on the system logs):

These are the lines that follow "PM: suspend exit"

Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 2470304 op 
0x1:(WRITE) flags 0x1800 phys_seg 2 prio class 1
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 1, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 2, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 337600 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 3, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 4, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 5, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 346752 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 6, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 7, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 8, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 373120 op 
0x1:(WRITE) flags 0x1800 phys_seg 1 prio class 1
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 9, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 378528 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: BTRFS error (device dm-0): bdev 
/dev/mapper/luks-7223e129-f73a-4877-98fc-bc00384ce937 errs: wr 10, rd 0, 
flush 0, corrupt 0, gen 0
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 378848 op 
0x1:(WRITE) flags 0x1800 phys_seg 4 prio class 1
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 389600 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 390016 op 
0x1:(WRITE) flags 0x1800 phys_seg 6 prio class 1
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 2434752 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: I/O error, dev sda, sector 2443904 op 
0x1:(WRITE) flags 0x1800 phys_seg 3 prio class 1
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: sd 2:0:0:0: [sda] tag#0 device offline 
or changed
Jan 19 11:56:43 coccobill kernel: BTRFS: error (device dm-0) in 
btrfs_commit_transaction:2535: errno=-5 IO failure (Error while writing 
out transaction)
Jan 19 11:56:43 coccobill kernel: BTRFS info (device dm-0 state E): 
forced readonly

In this case the errors are serious enough to cause btrfs to get to RO mode.

Let me recall that sda is my sd-card that works with the usb-storage 
module, and that I have layered btrfs over luks encryption on it.

The errors are related to the resume from sleep as they come out *only* 
after "PM: suspend exit". There are no errors for the device in normal 
operation.

Before getting to the patch, I have also made more experiments:

- Trying to modify the usb-storage delay_use parameter has no effect on 
the issue.

This looks strange to me since this parameter should specifically 
control how much time the kernel waits before using the sd-card on my 
system.

Trying to modify the /sys/block/sda/events_poll_msecs also makes no 
difference at all (normally it is -1, I have tried to change that from 
100 ms to 2 s).

Thanks for the attention,

Best
Sergio