David,

I think you maintain btrfs-progs, but I'm not sure if you're in charge 
of check --repair.
Could you comment on the bottom of the mail, namely:
> failed to repair damaged filesystem, aborting
> So, I'm out of luck now, full wipe and 3-5 day rebuild?
 
Thanks,
Marc

Rest:
On Tue, May 02, 2017 at 11:47:22AM -0700, Marc MERLIN wrote:
> (cc trimmed)
> 
> The one in debian/unstable crashed:
> gargamel:~# btrfs --version
> btrfs-progs v4.7.3
> gargamel:~# btrfs check --repair /dev/mapper/dshelf2
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> extent-tree.c:2721: alloc_reserved_tree_block: Assertion `ret` failed.
> btrfs[0x43e418]
> btrfs[0x43e43f]
> btrfs[0x43f276]
> btrfs[0x43f46f]
> btrfs[0x4407ef]
> btrfs[0x440963]
> btrfs(btrfs_inc_extent_ref+0x513)[0x44107a]
> btrfs[0x420053]
> btrfs[0x4265eb]
> btrfs(cmd_check+0x1111)[0x427d6d]
> btrfs(main+0x12f)[0x40a341]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f6b632e82b1]
> btrfs(_start+0x2a)[0x40a37a]
> 
> Ok, it's old, let's take git from today:
> gargamel:~# btrfs --version
> btrfs-progs v4.10.2
> As a note, 
> gargamel:~# btrfs check --mode=lowmem --repair /dev/mapper/dshelf2
> enabling repair mode
> ERROR: low memory mode doesn't support repair yet
> 
> As a note, a 32bit binary on a 64bit kernel:
> gargamel:~# btrfs check --repair /dev/mapper/dshelf2
> enabling repair mode
> Checking filesystem on /dev/mapper/dshelf2
> UUID: 03e9a50c-1ae6-4782-ab9c-5f310a98e653
> checking extents
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 1449488023552 found CECC36AF wanted 199FE6C5
> checksum verify failed on 1449488023552 found CECC36AF wanted 199FE6C5
> checksum verify failed on 1449544613888 found 895D691B wanted A0C64D2B
> checksum verify failed on 1449544613888 found 895D691B wanted A0C64D2B
> parent transid verify failed on 1671538819072 wanted 293964 found 293902
> parent transid verify failed on 1671538819072 wanted 293964 found 293902
> checksum verify failed on 1671603781632 found 18BC28D6 wanted 372655A0
> checksum verify failed on 1671603781632 found 18BC28D6 wanted 372655A0
> cmds-check.c:6291: add_data_backref: BUG_ON `!back` triggered, value 1
> Aborted
> 
> let's try again with a 64bit binary built from git:
> (...)
> Repaired extent references for 4227617038336
> ref mismatch on [4227872751616 4096] extent item 1, found 0
> Incorrect local backref count on 4227872751616 parent 3493071667200 owner 0
> offset 0 found 0 wanted 1 back 0x56470b18e7f0  
> Backref disk bytenr does not match extent record, bytenr=4227872751616, ref
> bytenr=0
> backpointer mismatch on [4227872751616 4096]
> owner ref check failed [4227872751616 4096]
> repair deleting extent record: key 4227872751616 168 4096
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E  
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> Repaired extent references for 4227872751616
> ref mismatch on [6674127745024 32768] extent item 0, found 1
> Backref 6674127745024 parent 7566652473344 owner 0 offset 0 num_refs 0 not
> found in extent tree
> Incorrect local backref count on 6674127745024 parent 7566652473344 owner 0
> offset 0 found 1 wanted 0 back 0x5648afda0f20  
> backpointer mismatch on [6674127745024 32768]
> checksum verify failed on 6983266418688 found 393B112A wanted 2B19CD5C
> checksum verify failed on 6983266418688 found 393B112A wanted 2B19CD5C
> checksum verify failed on 6983266418688 found BCBF9E15 wanted 785FF67E
> checksum verify failed on 6983266418688 found 393B112A wanted 2B19CD5C
> bytenr mismatch, want=6983266418688, have=13671317608077697645
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> checksum verify failed on 2899180224512 found ABBE39B0 wanted E0735D0E
> checksum verify failed on 2899180224512 found 7A6D427F wanted 7E899EE5
> bytenr mismatch, want=2899180224512, have=3981076597540270796
> failed to repair damaged filesystem, aborting
> 
> 
> So, I'm out of luck now, full wipe and 3-5 day rebuild?
> 
> Thanks,
> 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/  
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majord...@vger.kernel.org
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> 

-- 
"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 1024R/763BE901
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