Re: [PATCH v4 0/4] ata: fix deferred QC handling for port multipliers

[Tommy Kelly <linux@tkel.ly>]

On 5/13/26 23:42, Niklas Cassel wrote:
> Hello Tommy,
> 
> On Wed, May 13, 2026 at 09:42:35PM -0700, Tommy Kelly wrote:
>>
>>> U-Boot 2026.07-rc2-dirty
>>> kernel: Linux version 7.1.0-0.rc3.1d5dcaa3bd65.25.test.fc44.aarch64
>>> [ 1539.481926] BTRFS error (device nvme0n1p4 state EA): run_delalloc_nocow failed, root=5 inode=103820306 start=274432 len=4096 cur_offset=274432 oe_cleanup=274432 oe_cleanup_len=0 untouched_start=274432 untouched_len=4096: -5
>>> [ 1539.483785] BTRFS error (device nvme0n1p4 state EA): failed to run delalloc range, root=5 ino=103820306 folio=274432 submit_bitmap=0 start=274432 len=4096: -5
>>> [ 1596.136409] systemd-journald[800]: Failed to rotate /var/log/journal/c5b05402ed674946a0b721d8b2c649d1/system.journal: Read-only file system (Dropped 122276 similar message(s))
>>
>> Those 2 `BTRFS error` lines repeated over and over every couple seconds.
>>
>> This one seems to happen randomly, unable to reproduce consistently.
>> No idea why its happening.
>> But it has happened with both patched and un-patched u-boot devicetree.
> 
> Thanks a lot for testing!
> 
> The problem with PMP CBS is my fault, I made a mistake when creating V4.
> 
> The btrfs bug seems to be unrelated, even though it seems very bad.
> 
> It is good that you have UART so you could see what was going on.
> 
> Perhaps you could test on v7.0 (hopefully btrfs is more stable here) +
> v5 of this patch series (once I've sent it out).
> 
> I'm sorry for my mistake... hopefully it will not go beyond v5.
> 
> 
> Kind regards,
> Niklas

Hi Niklas,

I'll test v5 with CBS + FBS, no problem.

I just discovered SysRq + R (Replay the kernel log messages).
I will try that over serial next time it happens.

Thanks,
Tommy