On Tue, Jun 19, 2018 at 12:58:44PM -0400, Austin S. Hemmelgarn wrote:
> > In your situation, I would run "btrfs pause <path>", wait to hear from
> > a btrfs developer, and not use the volume whatsoever in the meantime.
> I would say this is probably good advice. I don't really know what's going
> on here myself actually, though it looks like the balance got stuck (the
> output hasn't changed for over 36 hours, unless you've got an insanely slow
> storage array, that's extremely unusual (it should only be moving at most
> 3GB of data per chunk)).
I didn't hear from any developer, so I had to continue.
- btrfs scrub cancel did not work (hang)
- at reboot mounting the filesystem hung, even with 4.17, which is
disappointing (it should not hang)
- mount -o recovery still hung
- mount -o ro did not hang though
Sigh, why is my FS corrupted again?
Anyway, back to
btrfs check --repair
and, it took all my 32GB of RAM on a system I can't add more RAM to, so
I'm hosed. I'll note in passing (and it's not ok at all) that check
--repair after a 20 to 30mn pause, takes all the kernel RAM more quickly
than the system can OOM or log anything, and just deadlocks it.
This is repeateable and totally not ok :(
I'm now left with btrfs-progs git master, and lowmem which finally does
a bit of repair.
So far:
gargamel:~# btrfs check --mode=lowmem --repair -p /dev/mapper/dshelf2
enabling repair mode
WARNING: low-memory mode repair support is only partial
Checking filesystem on /dev/mapper/dshelf2
UUID: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
Fixed 0 roots.
ERROR: extent[84302495744, 69632] referencer count mismatch (root: 21872, owner: 374857, offset: 3407872) wanted: 3, have: 4
Created new chunk [18457780224000 1073741824]
Delete backref in extent [84302495744 69632]
ERROR: extent[84302495744, 69632] referencer count mismatch (root: 22911, owner: 374857, offset: 3407872) wanted: 3, have: 4
Delete backref in extent [84302495744 69632]
ERROR: extent[125712527360, 12214272] referencer count mismatch (root: 21872, owner: 374857, offset: 114540544) wanted: 181, have: 240
Delete backref in extent [125712527360 12214272]
ERROR: extent[125730848768, 5111808] referencer count mismatch (root: 21872, owner: 374857, offset: 126754816) wanted: 68, have: 115
Delete backref in extent [125730848768 5111808]
ERROR: extent[125730848768, 5111808] referencer count mismatch (root: 22911, owner: 374857, offset: 126754816) wanted: 68, have: 115
Delete backref in extent [125730848768 5111808]
ERROR: extent[125736914944, 6037504] referencer count mismatch (root: 21872, owner: 374857, offset: 131866624) wanted: 115, have: 143
Delete backref in extent [125736914944 6037504]
ERROR: extent[125736914944, 6037504] referencer count mismatch (root: 22911, owner: 374857, offset: 131866624) wanted: 115, have: 143
Delete backref in extent [125736914944 6037504]
ERROR: extent[129952120832, 20242432] referencer count mismatch (root: 21872, owner: 374857, offset: 148234240) wanted: 302, have: 431
Delete backref in extent [129952120832 20242432]
ERROR: extent[129952120832, 20242432] referencer count mismatch (root: 22911, owner: 374857, offset: 148234240) wanted: 356, have: 433
Delete backref in extent [129952120832 20242432]
ERROR: extent[134925357056, 11829248] referencer count mismatch (root: 21872, owner: 374857, offset: 180371456) wanted: 161, have: 240
Delete backref in extent [134925357056 11829248]
ERROR: extent[134925357056, 11829248] referencer count mismatch (root: 22911, owner: 374857, offset: 180371456) wanted: 162, have: 240
Delete backref in extent [134925357056 11829248]
ERROR: extent[147895111680, 12345344] referencer count mismatch (root: 21872, owner: 374857, offset: 192200704) wanted: 170, have: 249
Delete backref in extent [147895111680 12345344]
ERROR: extent[147895111680, 12345344] referencer count mismatch (root: 22911, owner: 374857, offset: 192200704) wanted: 172, have: 251
Delete backref in extent [147895111680 12345344]
ERROR: extent[150850146304, 17522688] referencer count mismatch (root: 21872, owner: 374857, offset: 217653248) wanted: 348, have: 418
Delete backref in extent [150850146304 17522688]
ERROR: extent[156909494272, 55320576] referencer count mismatch (root: 22911, owner: 374857, offset: 235175936) wanted: 555, have: 1449
Deleted root 2 item[156909494272, 178, 5476627808561673095]
ERROR: extent[156909494272, 55320576] referencer count mismatch (root: 21872, owner: 374857, offset: 235175936) wanted: 556, have: 1452
Deleted root 2 item[156909494272, 178, 7338474132555182983]
At the rate it's going, it'll probably take days though, it's already been 36H
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 7F55D5F27AAF9D08
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