Re: btrfs root fs started remounting ro

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On 2020/2/9 上午9:20, John Hendy wrote:
> On Sat, Feb 8, 2020 at 7:09 PM Qu Wenruo <quwenruo.btrfs@xxxxxxx> wrote:
>>
>>
>>
>> On 2020/2/9 上午8:59, John Hendy wrote:
>>> Also, if it's of interest, the zero-log trick was new to me. For my
>>> original m2.sata nvme drive, I'd already run all of --init-csum-tree,
>>> --init-extent-tree, and --repair (unsure on the order of the first
>>> two, but --repair was definitely last) but could then not mount it. I
>>> just ran `btrfs rescue zero-log` on it and here is the very brief
>>> output from a btrfs check:
>>>
>>> $ sudo btrfs check /dev/mapper/nvme
>>> Opening filesystem to check...
>>> Checking filesystem on /dev/mapper/nvme
>>> UUID: 488f733d-1dfd-4a0f-ab2f-ba690e095fe4
>>> [1/7] checking root items
>>> [2/7] checking extents
>>> data backref 40762777600 root 256 owner 525787 offset 0 num_refs 0 not
>>> found in extent tree
>>> incorrect local backref count on 40762777600 root 256 owner 525787
>>> offset 0 found 1 wanted 0 back 0x5635831f9a20
>>> incorrect local backref count on 40762777600 root 4352 owner 525787
>>> offset 0 found 0 wanted 1 back 0x56357e5a3c70
>>> backref disk bytenr does not match extent record, bytenr=40762777600,
>>> ref bytenr=0
>>> backpointer mismatch on [40762777600 4096]
>>
>> At this stage, btrfs check --repair should be able to fix it.
>>
>> Or does it still segfault?
> 
> This was the original problematic drive, the m2.sata. I just did
> `btrfs check --repair` and it completed with:
> 
> $ sudo btrfs check --repair /dev/mapper/nvme
> enabling repair mode
> WARNING:
> 
>     Do not use --repair unless you are advised to do so by a developer
>     or an experienced user, and then only after having accepted that no
>     fsck can successfully repair all types of filesystem corruption. Eg.
>     some software or hardware bugs can fatally damage a volume.
>     The operation will start in 10 seconds.
>     Use Ctrl-C to stop it.
> 10 9 8 7 6 5 4 3 2 1
> Starting repair.
> Opening filesystem to check...
> Checking filesystem on /dev/mapper/nvme
> UUID: 488f733d-1dfd-4a0f-ab2f-ba690e095fe4
> [1/7] checking root items
> Fixed 0 roots.
> [2/7] checking extents
> data backref 40762777600 root 256 owner 525787 offset 0 num_refs 0 not
> found in extent tree
> incorrect local backref count on 40762777600 root 256 owner 525787
> offset 0 found 1 wanted 0 back 0x5561d1f74ee0
> incorrect local backref count on 40762777600 root 4352 owner 525787
> offset 0 found 0 wanted 1 back 0x5561cd31f220
> backref disk bytenr does not match extent record, bytenr=40762777600,
> ref bytenr=0
> backpointer mismatch on [40762777600 4096]
> repair deleting extent record: key [40762777600,168,4096]
> adding new data backref on 40762777600 root 256 owner 525787 offset 0 found 1
> Repaired extent references for 40762777600
> No device size related problem found
> [3/7] checking free space cache
> cache and super generation don't match, space cache will be invalidated
> [4/7] checking fs roots
> [5/7] checking only csums items (without verifying data)
> [6/7] checking root refs
> [7/7] checking quota groups skipped (not enabled on this FS)
> found 87799443456 bytes used, no error found
> total csum bytes: 84696784
> total tree bytes: 954220544
> total fs tree bytes: 806535168
> total extent tree bytes: 47710208
> btree space waste bytes: 150766636
> file data blocks allocated: 87780622336
>  referenced 94255783936
> 
> The output of btrfs check now on this drive:
> 
> $ sudo btrfs check /dev/mapper/nvme
> Opening filesystem to check...
> Checking filesystem on /dev/mapper/nvme
> UUID: 488f733d-1dfd-4a0f-ab2f-ba690e095fe4
> [1/7] checking root items
> [2/7] checking extents
> [3/7] checking free space cache
> cache and super generation don't match, space cache will be invalidated
> [4/7] checking fs roots
> [5/7] checking only csums items (without verifying data)
> [6/7] checking root refs
> [7/7] checking quota groups skipped (not enabled on this FS)
> found 87799443456 bytes used, no error found
> total csum bytes: 84696784
> total tree bytes: 954220544
> total fs tree bytes: 806535168
> total extent tree bytes: 47710208
> btree space waste bytes: 150766636
> file data blocks allocated: 87780622336
>  referenced 94255783936

Just as it said, there is no error found by btrfs-check.

If you want to be extra safe, please run `btrfs check` again, using
v5.4.1 (which adds an extra check for extent item generation).

At this stage, at least v5.3 kernel should be able to mount it, and
delete offending files.

v5.4 is a little more strict on extent item generation. But if you
delete the offending files using v5.3, everything should be fine.

If you want to be abosultely safe, you can run `btrfs check
--check-data-csum` to do a scrub-like check on data.

Thanks,
Qu
> 
> How is that looking? I'll boot back into a usb drive to try --repair
> --mode=lowmem on the SSD. My continued worry is the spurious file I
> can't delete. Is that something btrfs --repair will try to fix or is
> there something else that needs to be done? It seems this inode is
> tripping things up and I can't find a way to get rid of that file.
> 
> John
> 
> 
>>
>> Thanks,
>> Qu
>>> ERROR: errors found in extent allocation tree or chunk allocation
>>> [3/7] checking free space cache
>>> [4/7] checking fs roots
>>> [5/7] checking only csums items (without verifying data)
>>> [6/7] checking root refs
>>> [7/7] checking quota groups skipped (not enabled on this FS)
>>> found 87799443456 bytes used, error(s) found
>>> total csum bytes: 84696784
>>> total tree bytes: 954220544
>>> total fs tree bytes: 806535168
>>> total extent tree bytes: 47710208
>>> btree space waste bytes: 150766636
>>> file data blocks allocated: 87780622336
>>>  referenced 94255783936
>>>
>>> If that looks promising... I'm hoping that the ssd we're currently
>>> working on will follow suit! I'll await your recommendation for what
>>> to do on the previous inquiries for the SSD, and if you have any
>>> suggestions for the backref errors on the nvme drive above.
>>>
>>> Many thanks,
>>> John
>>>
>>> On Sat, Feb 8, 2020 at 6:51 PM John Hendy <jw.hendy@xxxxxxxxx> wrote:
>>>>
>>>> On Sat, Feb 8, 2020 at 5:56 PM Qu Wenruo <quwenruo.btrfs@xxxxxxx> wrote:
>>>>>
>>>>>
>>>>>
>>>>> On 2020/2/9 上午5:57, John Hendy wrote:
>>>>>> On phone due to no OS, so apologies if this is in html mode. Indeed, I
>>>>>> can't mount or boot any longer. I get the error:
>>>>>>
>>>>>> Error (device dm-0) in btrfs_replay_log:2228: errno=-22 unknown (Failed
>>>>>> to recover log tree)
>>>>>> BTRFS error (device dm-0): open_ctree failed
>>>>>
>>>>> That can be easily fixed by `btrfs rescue zero-log`.
>>>>>
>>>>
>>>> Whew. This was most helpful and it is wonderful to be booting at
>>>> least. I think the outstanding issues are:
>>>> - what should I do about `btrfs check --repair seg` faulting?
>>>> - how can I deal with this (probably related to seg fault) ghost file
>>>> that cannot be deleted?
>>>> - I'm not sure if you looked at the post --repair log, but there a ton
>>>> of these errors that didn't used to be there:
>>>>
>>>> backpointer mismatch on [13037375488 20480]
>>>> ref mismatch on [13037395968 892928] extent item 0, found 1
>>>> data backref 13037395968 root 263 owner 4257169 offset 0 num_refs 0
>>>> not found in extent tree
>>>> incorrect local backref count on 13037395968 root 263 owner 4257169
>>>> offset 0 found 1 wanted 0 back 0x5627f59cadc0
>>>>
>>>> Here is the latest btrfs check output after the zero-log operation.
>>>> - https://pastebin.com/KWeUnk0y
>>>>
>>>> I'm hoping once that file is deleted, it's a matter of
>>>> --init-csum-tree and perhaps I'm set? Or --init-extent-tree?
>>>>
>>>> Thanks,
>>>> John
>>>>
>>>>> At least, btrfs check --repair didn't make things worse.
>>>>>
>>>>> Thanks,
>>>>> Qu
>>>>>>
>>>>>> John
>>>>>>
>>>>>> On Sat, Feb 8, 2020, 1:56 PM John Hendy <jw.hendy@xxxxxxxxx
>>>>>> <mailto:jw.hendy@xxxxxxxxx>> wrote:
>>>>>>
>>>>>>     This is not going so hot. Updates:
>>>>>>
>>>>>>     booted from arch install, pre repair btrfs check:
>>>>>>     - https://pastebin.com/6vNaSdf2
>>>>>>
>>>>>>     btrfs check --mode=lowmem as requested by Chris:
>>>>>>     - https://pastebin.com/uSwSTVVY
>>>>>>
>>>>>>     Then I did btrfs check --repair, which seg faulted at the end. I've
>>>>>>     typed them off of pictures I took:
>>>>>>
>>>>>>     Starting repair.
>>>>>>     Opening filesystem to check...
>>>>>>     Checking filesystem on /dev/mapper/ssd
>>>>>>     [1/7] checking root items
>>>>>>     Fixed 0 roots.
>>>>>>     [2/7] checking extents
>>>>>>     parent transid verify failed on 20271138064 wanted 68719924810 found
>>>>>>     448074
>>>>>>     parent transid verify failed on 20271138064 wanted 68719924810 found
>>>>>>     448074
>>>>>>     Ignoring transid failure
>>>>>>     # ... repeated the previous two lines maybe hundreds of times
>>>>>>     # ended with this:
>>>>>>     ref mismatch on [12797435904 268505088] extent item 1, found 412
>>>>>>     [1] 1814 segmentation fault (core dumped) btrfs check --repair
>>>>>>     /dev/mapper/ssd
>>>>>>
>>>>>>     This was with btrfs-progs 5.4 (the install USB is maybe a month old).
>>>>>>
>>>>>>     Here is the output of btrfs check after the --repair attempt:
>>>>>>     - https://pastebin.com/6MYRNdga
>>>>>>
>>>>>>     I rebooted to write this email given the seg fault, as I wanted to
>>>>>>     make sure that I should still follow-up --repair with
>>>>>>     --init-csum-tree. I had pictures of the --repair output, but Firefox
>>>>>>     just wouldn't load imgur.com <http://imgur.com> for me to post the
>>>>>>     pics and was acting
>>>>>>     really weird. In suspiciously checking dmesg, things have gone ro on
>>>>>>     me :(  Here is the dmesg from this session:
>>>>>>     - https://pastebin.com/a2z7xczy
>>>>>>
>>>>>>     The gist is:
>>>>>>
>>>>>>     [   40.997935] BTRFS critical (device dm-0): corrupt leaf: root=7
>>>>>>     block=172703744 slot=0, csum end range (12980568064) goes beyond the
>>>>>>     start range (12980297728) of the next csum item
>>>>>>     [   40.997941] BTRFS info (device dm-0): leaf 172703744 gen 450983
>>>>>>     total ptrs 34 free space 29 owner 7
>>>>>>     [   40.997942]     item 0 key (18446744073709551606 128 12979060736)
>>>>>>     itemoff 14811 itemsize 1472
>>>>>>     [   40.997944]     item 1 key (18446744073709551606 128 12980297728)
>>>>>>     itemoff 13895 itemsize 916
>>>>>>     [   40.997945]     item 2 key (18446744073709551606 128 12981235712)
>>>>>>     itemoff 13811 itemsize 84
>>>>>>     # ... there's maybe 30 of these item n key lines in total
>>>>>>     [   40.997984] BTRFS error (device dm-0): block=172703744 write time
>>>>>>     tree block corruption detected
>>>>>>     [   41.016793] BTRFS: error (device dm-0) in
>>>>>>     btrfs_commit_transaction:2332: errno=-5 IO failure (Error while
>>>>>>     writing out transaction)
>>>>>>     [   41.016799] BTRFS info (device dm-0): forced readonly
>>>>>>     [   41.016802] BTRFS warning (device dm-0): Skipping commit of aborted
>>>>>>     transaction.
>>>>>>     [   41.016804] BTRFS: error (device dm-0) in cleanup_transaction:1890:
>>>>>>     errno=-5 IO failure
>>>>>>     [   41.016807] BTRFS info (device dm-0): delayed_refs has NO entry
>>>>>>     [   41.023473] BTRFS warning (device dm-0): Skipping commit of aborted
>>>>>>     transaction.
>>>>>>     [   41.024297] BTRFS info (device dm-0): delayed_refs has NO entry
>>>>>>     [   44.509418] systemd-journald[416]:
>>>>>>     /var/log/journal/45c06c25e25f434195204efa939019ab/system.journal:
>>>>>>     Journal file corrupted, rotating.
>>>>>>     [   44.509440] systemd-journald[416]: Failed to rotate
>>>>>>     /var/log/journal/45c06c25e25f434195204efa939019ab/system.journal:
>>>>>>     Read-only file system
>>>>>>     [   44.509450] systemd-journald[416]: Failed to rotate
>>>>>>     /var/log/journal/45c06c25e25f434195204efa939019ab/user-1000.journal:
>>>>>>     Read-only file system
>>>>>>     [   44.509540] systemd-journald[416]: Failed to write entry (23 items,
>>>>>>     705 bytes) despite vacuuming, ignoring: Bad message
>>>>>>     # ... then a bunch of these failed journal attempts (of note:
>>>>>>     /var/log/journal was one of the bad inodes from btrfs check
>>>>>>     previously)
>>>>>>
>>>>>>     Kindly let me know what you would recommend. I'm sadly back to an
>>>>>>     unusable system vs. a complaining/worrisome one. This is similar to
>>>>>>     the behavior I had with the m2.sata nvme drive in my original
>>>>>>     experience. After trying all of --repair, --init-csum-tree, and
>>>>>>     --init-extent-tree, I couldn't boot anymore. After my dm-crypt
>>>>>>     password at boot, I just saw a bunch of [FAILED] in the text splash
>>>>>>     output. Hoping to not repeat that with this drive.
>>>>>>
>>>>>>     Thanks,
>>>>>>     John
>>>>>>
>>>>>>
>>>>>>     On Sat, Feb 8, 2020 at 1:29 AM Qu Wenruo <quwenruo.btrfs@xxxxxxx
>>>>>>     <mailto:quwenruo.btrfs@xxxxxxx>> wrote:
>>>>>>     >
>>>>>>     >
>>>>>>     >
>>>>>>     > On 2020/2/8 下午12:48, John Hendy wrote:
>>>>>>     > > On Fri, Feb 7, 2020 at 5:42 PM Qu Wenruo <quwenruo.btrfs@xxxxxxx
>>>>>>     <mailto:quwenruo.btrfs@xxxxxxx>> wrote:
>>>>>>     > >>
>>>>>>     > >>
>>>>>>     > >>
>>>>>>     > >> On 2020/2/8 上午1:52, John Hendy wrote:
>>>>>>     > >>> Greetings,
>>>>>>     > >>>
>>>>>>     > >>> I'm resending, as this isn't showing in the archives. Perhaps
>>>>>>     it was
>>>>>>     > >>> the attachments, which I've converted to pastebin links.
>>>>>>     > >>>
>>>>>>     > >>> As an update, I'm now running off of a different drive (ssd,
>>>>>>     not the
>>>>>>     > >>> nvme) and I got the error again! I'm now inclined to think
>>>>>>     this might
>>>>>>     > >>> not be hardware after all, but something related to my setup
>>>>>>     or a bug
>>>>>>     > >>> with chromium.
>>>>>>     > >>>
>>>>>>     > >>> After a reboot, chromium wouldn't start for me and demsg showed
>>>>>>     > >>> similar parent transid/csum errors to my original post below.
>>>>>>     I used
>>>>>>     > >>> btrfs-inspect-internal to find the inode traced to
>>>>>>     > >>> ~/.config/chromium/History. I deleted that, and got a new set of
>>>>>>     > >>> errors tracing to ~/.config/chromium/Cookies. After I deleted
>>>>>>     that and
>>>>>>     > >>> tried starting chromium, I found that my btrfs /home/jwhendy
>>>>>>     pool was
>>>>>>     > >>> mounted ro just like the original problem below.
>>>>>>     > >>>
>>>>>>     > >>> dmesg after trying to start chromium:
>>>>>>     > >>> - https://pastebin.com/CsCEQMJa
>>>>>>     > >>
>>>>>>     > >> So far, it's only transid bug in your csum tree.
>>>>>>     > >>
>>>>>>     > >> And two backref mismatch in data backref.
>>>>>>     > >>
>>>>>>     > >> In theory, you can fix your problem by `btrfs check --repair
>>>>>>     > >> --init-csum-tree`.
>>>>>>     > >>
>>>>>>     > >
>>>>>>     > > Now that I might be narrowing in on offending files, I'll wait
>>>>>>     to see
>>>>>>     > > what you think from my last response to Chris. I did try the above
>>>>>>     > > when I first ran into this:
>>>>>>     > > -
>>>>>>     https://lore.kernel.org/linux-btrfs/CA+M2ft8FpjdDQ7=XwMdYQazhyB95aha_D4WU_n15M59QrimrRg@xxxxxxxxxxxxxx/
>>>>>>     >
>>>>>>     > That RO is caused by the missing data backref.
>>>>>>     >
>>>>>>     > Which can be fixed by btrfs check --repair.
>>>>>>     >
>>>>>>     > Then you should be able to delete offending files them. (Or the whole
>>>>>>     > chromium cache, and switch to firefox if you wish :P )
>>>>>>     >
>>>>>>     > But also please keep in mind that, the transid mismatch looks
>>>>>>     happen in
>>>>>>     > your csum tree, which means your csum tree is no longer reliable, and
>>>>>>     > may cause -EIO reading unrelated files.
>>>>>>     >
>>>>>>     > Thus it's recommended to re-fill the csum tree by --init-csum-tree.
>>>>>>     >
>>>>>>     > It can be done altogether by --repair --init-csum-tree, but to be
>>>>>>     safe,
>>>>>>     > please run --repair only first, then make sure btrfs check reports no
>>>>>>     > error after that. Then go --init-csum-tree.
>>>>>>     >
>>>>>>     > >
>>>>>>     > >> But I'm more interesting in how this happened.
>>>>>>     > >
>>>>>>     > > Me too :)
>>>>>>     > >
>>>>>>     > >> Have your every experienced any power loss for your NVME drive?
>>>>>>     > >> I'm not say btrfs is unsafe against power loss, all fs should
>>>>>>     be safe
>>>>>>     > >> against power loss, I'm just curious about if mount time log
>>>>>>     replay is
>>>>>>     > >> involved, or just regular internal log replay.
>>>>>>     > >>
>>>>>>     > >> From your smartctl, the drive experienced 61 unsafe shutdown
>>>>>>     with 2144
>>>>>>     > >> power cycles.
>>>>>>     > >
>>>>>>     > > Uhhh, hell yes, sadly. I'm a dummy running i3 and every time I get
>>>>>>     > > caught off gaurd by low battery and instant power-off, I kick myself
>>>>>>     > > and mean to set up a script to force poweroff before that
>>>>>>     happens. So,
>>>>>>     > > indeed, I've lost power a ton. Surprised it was 61 times, but maybe
>>>>>>     > > not over ~2 years. And actually, I mis-stated the age. I haven't
>>>>>>     > > *booted* from this drive in almost 2yrs. It's a corporate laptop,
>>>>>>     > > issued every 3, so the ssd drive is more like 5 years old.
>>>>>>     > >
>>>>>>     > >> Not sure if it's related.
>>>>>>     > >>
>>>>>>     > >> Another interesting point is, did you remember what's the
>>>>>>     oldest kernel
>>>>>>     > >> running on this fs? v5.4 or v5.5?
>>>>>>     > >
>>>>>>     > > Hard to say, but arch linux maintains a package archive. The nvme
>>>>>>     > > drive is from ~May 2018. The archives only go back to Jan 2019
>>>>>>     and the
>>>>>>     > > kernel/btrfs-progs was at 4.20 then:
>>>>>>     > > - https://archive.archlinux.org/packages/l/linux/
>>>>>>     >
>>>>>>     > There is a known bug in v5.2.0~v5.2.14 (fixed in v5.2.15), which could
>>>>>>     > cause metadata corruption. And the symptom is transid error, which
>>>>>>     also
>>>>>>     > matches your problem.
>>>>>>     >
>>>>>>     > Thanks,
>>>>>>     > Qu
>>>>>>     >
>>>>>>     > >
>>>>>>     > > Searching my Amazon orders, the SSD was in the 2015 time frame,
>>>>>>     so the
>>>>>>     > > kernel version would have been even older.
>>>>>>     > >
>>>>>>     > > Thanks for your input,
>>>>>>     > > John
>>>>>>     > >
>>>>>>     > >>
>>>>>>     > >> Thanks,
>>>>>>     > >> Qu
>>>>>>     > >>>
>>>>>>     > >>> Thanks for any pointers, as it would now seem that my purchase
>>>>>>     of a
>>>>>>     > >>> new m2.sata may not buy my way out of this problem! While I didn't
>>>>>>     > >>> want to reinstall, at least new hardware is a simple fix. Now I'm
>>>>>>     > >>> worried there is a deeper issue bound to recur :(
>>>>>>     > >>>
>>>>>>     > >>> Best regards,
>>>>>>     > >>> John
>>>>>>     > >>>
>>>>>>     > >>> On Wed, Feb 5, 2020 at 10:01 AM John Hendy <jw.hendy@xxxxxxxxx
>>>>>>     <mailto:jw.hendy@xxxxxxxxx>> wrote:
>>>>>>     > >>>>
>>>>>>     > >>>> Greetings,
>>>>>>     > >>>>
>>>>>>     > >>>> I've had this issue occur twice, once ~1mo ago and once a
>>>>>>     couple of
>>>>>>     > >>>> weeks ago. Chromium suddenly quit on me, and when trying to
>>>>>>     start it
>>>>>>     > >>>> again, it complained about a lock file in ~. I tried to delete it
>>>>>>     > >>>> manually and was informed I was on a read-only fs! I ended up
>>>>>>     biting
>>>>>>     > >>>> the bullet and re-installing linux due to the number of dead end
>>>>>>     > >>>> threads and slow response rates on diagnosing these issues,
>>>>>>     and the
>>>>>>     > >>>> issue occurred again shortly after.
>>>>>>     > >>>>
>>>>>>     > >>>> $ uname -a
>>>>>>     > >>>> Linux whammy 5.5.1-arch1-1 #1 SMP PREEMPT Sat, 01 Feb 2020
>>>>>>     16:38:40
>>>>>>     > >>>> +0000 x86_64 GNU/Linux
>>>>>>     > >>>>
>>>>>>     > >>>> $ btrfs --version
>>>>>>     > >>>> btrfs-progs v5.4
>>>>>>     > >>>>
>>>>>>     > >>>> $ btrfs fi df /mnt/misc/ # full device; normally would be
>>>>>>     mounting a subvol on /
>>>>>>     > >>>> Data, single: total=114.01GiB, used=80.88GiB
>>>>>>     > >>>> System, single: total=32.00MiB, used=16.00KiB
>>>>>>     > >>>> Metadata, single: total=2.01GiB, used=769.61MiB
>>>>>>     > >>>> GlobalReserve, single: total=140.73MiB, used=0.00B
>>>>>>     > >>>>
>>>>>>     > >>>> This is a single device, no RAID, not on a VM. HP Zbook 15.
>>>>>>     > >>>> nvme0n1                                       259:5    0
>>>>>>     232.9G  0 disk
>>>>>>     > >>>> ├─nvme0n1p1                                   259:6    0
>>>>>>      512M  0
>>>>>>     > >>>> part  (/boot/efi)
>>>>>>     > >>>> ├─nvme0n1p2                                   259:7    0
>>>>>>      1G  0 part  (/boot)
>>>>>>     > >>>> └─nvme0n1p3                                   259:8    0
>>>>>>     231.4G  0 part (btrfs)
>>>>>>     > >>>>
>>>>>>     > >>>> I have the following subvols:
>>>>>>     > >>>> arch: used for / when booting arch
>>>>>>     > >>>> jwhendy: used for /home/jwhendy on arch
>>>>>>     > >>>> vault: shared data between distros on /mnt/vault
>>>>>>     > >>>> bionic: root when booting ubuntu bionic
>>>>>>     > >>>>
>>>>>>     > >>>> nvme0n1p3 is encrypted with dm-crypt/LUKS.
>>>>>>     > >>>>
>>>>>>     > >>>> dmesg, smartctl, btrfs check, and btrfs dev stats attached.
>>>>>>     > >>>
>>>>>>     > >>> Edit: links now:
>>>>>>     > >>> - btrfs check: https://pastebin.com/nz6Bc145
>>>>>>     > >>> - dmesg: https://pastebin.com/1GGpNiqk
>>>>>>     > >>> - smartctl: https://pastebin.com/ADtYqfrd
>>>>>>     > >>>
>>>>>>     > >>> btrfs dev stats (not worth a link):
>>>>>>     > >>>
>>>>>>     > >>> [/dev/mapper/old].write_io_errs    0
>>>>>>     > >>> [/dev/mapper/old].read_io_errs     0
>>>>>>     > >>> [/dev/mapper/old].flush_io_errs    0
>>>>>>     > >>> [/dev/mapper/old].corruption_errs  0
>>>>>>     > >>> [/dev/mapper/old].generation_errs  0
>>>>>>     > >>>
>>>>>>     > >>>
>>>>>>     > >>>> If these are of interested, here are reddit threads where I
>>>>>>     posted the
>>>>>>     > >>>> issue and was referred here.
>>>>>>     > >>>> 1)
>>>>>>     https://www.reddit.com/r/btrfs/comments/ejqhyq/any_hope_of_recovering_from_various_errors_root/
>>>>>>     > >>>> 2)
>>>>>>     https://www.reddit.com/r/btrfs/comments/erh0f6/second_time_btrfs_root_started_remounting_as_ro/
>>>>>>     > >>>>
>>>>>>     > >>>> It has been suggested this is a hardware issue. I've already
>>>>>>     ordered a
>>>>>>     > >>>> replacement m2.sata, but for sanity it would be great to know
>>>>>>     > >>>> definitively this was the case. If anything stands out above that
>>>>>>     > >>>> could indicate I'm not setup properly re. btrfs, that would
>>>>>>     also be
>>>>>>     > >>>> fantastic so I don't repeat the issue!
>>>>>>     > >>>>
>>>>>>     > >>>> The only thing I've stumbled on is that I have been mounting with
>>>>>>     > >>>> rd.luks.options=discard and that manually running fstrim is
>>>>>>     preferred.
>>>>>>     > >>>>
>>>>>>     > >>>>
>>>>>>     > >>>> Many thanks for any input/suggestions,
>>>>>>     > >>>> John
>>>>>>     > >>
>>>>>>     >
>>>>>>
>>>>>
>>

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