* backref mismatch / backpointer mismatch
@ 2020-09-09 14:51 Johannes Rohr
2020-09-10 2:16 ` Qu Wenruo
0 siblings, 1 reply; 3+ messages in thread
From: Johannes Rohr @ 2020-09-09 14:51 UTC (permalink / raw)
To: linux-btrfs
Dear all,
Last night I did a readonly offline check of our server's file system
and I got a bunch of backref mismatch / backpointer mismatch errors.
Since everybody is warning NOT to use btrfsck --repair, I wonder what
options I have of fixing this issue, short of reformatting the whole disk
All the info (uname -a, btrfs fi usage, btrfs check output) is here:
https://gist.github.com/vasyugan/45471206df5d9981f51b9bbf9362508f
Thanks so much in advance for your advice,
Johannes
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: backref mismatch / backpointer mismatch
2020-09-09 14:51 backref mismatch / backpointer mismatch Johannes Rohr
@ 2020-09-10 2:16 ` Qu Wenruo
2020-09-10 5:36 ` Johannes Rohr
0 siblings, 1 reply; 3+ messages in thread
From: Qu Wenruo @ 2020-09-10 2:16 UTC (permalink / raw)
To: Johannes Rohr, linux-btrfs
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On 2020/9/9 下午10:51, Johannes Rohr wrote:
> Dear all,
>
> Last night I did a readonly offline check of our server's file system
> and I got a bunch of backref mismatch / backpointer mismatch errors.
>
> Since everybody is warning NOT to use btrfsck --repair, I wonder what
> options I have of fixing this issue, short of reformatting the whole disk
>
> All the info (uname -a, btrfs fi usage, btrfs check output) is here:
>
> https://gist.github.com/vasyugan/45471206df5d9981f51b9bbf9362508f
What about `btrfs check --mode=lowmem` result?
If your btrfs-progs is not uptodate, it may be a false alert.
Thanks,
Qu
>
> Thanks so much in advance for your advice,
>
> Johannes
>
>
>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: backref mismatch / backpointer mismatch
2020-09-10 2:16 ` Qu Wenruo
@ 2020-09-10 5:36 ` Johannes Rohr
0 siblings, 0 replies; 3+ messages in thread
From: Johannes Rohr @ 2020-09-10 5:36 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
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Am 10.09.20 um 04:16 schrieb Qu Wenruo:
>
> On 2020/9/9 下午10:51, Johannes Rohr wrote:
> What about `btrfs check --mode=lowmem` result?
Too late already. After getting the green light in #btrfs, I ran the
--repair and it fixed the issue.
>
> If your btrfs-progs is not uptodate, it may be a false alert.
The reason why I did the offline check in the first place was that there
were issues, namely, that btrfs balance start -musage=70 / resulted in a
segfault and also my attempts to remove a faulty sdd from the RAID
reproducibly led to a kernel oops and a hung filesystem. I had asked
about this two times on the list [1] also reported the issue to the
kernel bugzilla [2]. Also, upgraded btrfs-progs to 5.7 before running
the test.
Fortunately --repair has fixed these issues.
Cheers,
Johannes
[1] https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg88916.html
[2] , https://bugzilla.kernel.org/show_bug.cgi?id=209143
>
> Thanks,
> Qu
>> Thanks so much in advance for your advice,
>>
>> Johannes
>>
>>
>>
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-09-09 14:51 backref mismatch / backpointer mismatch Johannes Rohr
2020-09-10 2:16 ` Qu Wenruo
2020-09-10 5:36 ` Johannes Rohr
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