On 2019/11/5 上午9:03, Tomasz Chmielewski wrote:
> On 2019-11-05 09:52, Qu Wenruo wrote:
> 
>>> Now let's try to unmount and see what "btrfs rescue fix-device-size"
>>> shows again - I'd expect "No device size related problem found",
>>> correct?
>>>
>>>
>>> # umount /home
>>>
>>> # btrfs rescue fix-device-size /dev/sda4
>>> parent transid verify failed on 265344253952 wanted 42646 found 46119
>>> parent transid verify failed on 265344253952 wanted 42646 found 46119
>>> parent transid verify failed on 265344253952 wanted 42646 found 46119
>>
>> This is not correct. What happened during your /home mount and unmount?
>>
>> The fs looks already screwed up.
> 
> Nothing happened - it normally mounts/unmounts without errors.
> 
> Also scrub works without issues (a few days ago):
> 
> # btrfs scrub status /home
> UUID:             c94ea4a9-6d10-4e78-9b4a-ffe664386af2
> Scrub started:    Sat Nov  2 01:14:17 2019
> Status:           finished
> Duration:         0:55:23
> Total to scrub:   1.17TiB
> Rate:             368.41MiB/s
> Error summary:    no errors found
> 
> 
> It also no longer shows "parent transid verify failed" after a few more
> cycles like this:
> 
> # umount /home
> 
> # btrfs rescue fix-device-size /dev/sda4
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> Ignoring transid failure
> Fixed super total bytes, old size: 7901711842304 new size: 7901711835136
> Fixed unaligned/mismatched total_bytes for super block and device items

When this transid mismatch happens, it's highly recommended to do a
btrfs check on it.

I won't be surprised by some error.

> 
> # btrfs rescue fix-device-size /dev/sda4
> No device size related problem found
> 
> # mount /home ; sync ; umount /home
> 
> # btrfs rescue fix-device-size /dev/sda4
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> parent transid verify failed on 265344253952 wanted 42646 found 46119
> Ignoring transid failure
> Fixed super total bytes, old size: 7901711842304 new size: 7901711835136
> Fixed unaligned/mismatched total_bytes for super block and device items
> 
> # mount /home ; sync ; umount /home
> 
> # btrfs rescue fix-device-size /dev/sda4
> No device size related problem found
> 
> # btrfs rescue fix-device-size /dev/sda4
> No device size related problem found
> 
> # mount /home ; sync ; umount /home
> 
> # btrfs rescue fix-device-size /dev/sda4
> No device size related problem found
> 
> # btrfs rescue fix-device-size /dev/sdb4
> No device size related problem found
> 
> # mount /home
> 
> # date > /home/date.txt
> 
> # umount /home
> 
> # btrfs rescue fix-device-size /dev/sdb4
> No device size related problem found

And that kernel warning still exists?

Thanks,
Qu
> 
> 
> 
> Tomasz Chmielewski
> https://lxadm.com