Re: Recovery possible on asynchronous transid ?

[Juergen Sauer]

Am 15.09.2015 um 17:55 schrieb Hugo Mills:
> On Tue, Sep 15, 2015 at 04:22:08PM +0200, Juergen Sauer wrote:

>> Due an hibernation event my BTRFS Raid56 failed and is not mountable
>> anymore. :(

>> For Debugging I moved the Devices to an test-hardware and booted this
>> system from an Arch Linux ISO, which I created for this purpose.

>> The Problem is:
>> [ 1086.714109] BTRFS (device sdd1): parent transid verify failed on
>> 209362944 wanted 293924 found 293922

>Try mounting with -o recovery, and see if that helps.

Looks bad, does not really work:
[68928.031733] BTRFS info (device sdd1): enabling auto recovery
[68928.031737] BTRFS info (device sdd1): disk space caching is enabled
[68928.054066] BTRFS (device sdd1): parent transid verify failed on
209362944 wanted 293924 found 293922
[68928.069521] BTRFS (device sdd1): parent transid verify failed on
244719616 wanted 293924 found 293922
[68928.071678] BTRFS: bdev /dev/sdb1 errs: wr 3, rd 0, flush 1, corrupt
0, gen 0
[68928.072003] BTRFS (device sdd1): parent transid verify failed on
209375232 wanted 293924 found 293914
[68928.080334] BTRFS (device sdd1): parent transid verify failed on
245538816 wanted 293924 found 293922
[68928.123135] BTRFS (device sdd1): parent transid verify failed on
253378560 wanted 293924 found 293914
[68928.145374] BTRFS (device sdd1): parent transid verify failed on
253390848 wanted 293924 found 293914
[68928.146821] BTRFS (device sdd1): parent transid verify failed on
253403136 wanted 293924 found 293914
[68928.261550] BTRFS (device sdd1): parent transid verify failed on
253911040 wanted 293924 found 293914
[68928.263319] BTRFS (device sdd1): bad tree block start 0 253911040

I think, it could hel to be able to choose a special transid or to work
read-only on an special older transid, i.e. 'transid: 293914' ?

But how to do that?

Or may it help to remove an device out of raid56 cluster?


mit freundlichen Grüßen
Jürgen Sauer
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Re: Recovery possible on asynchronous transid ?

[Hugo Mills]

On Tue, Sep 15, 2015 at 04:22:08PM +0200, Juergen Sauer wrote:
> Hi!
> 
> Due an hibernation event my BTRFS Raid56 failed and is not mountable
> anymore. :(
> 
> For Debugging I moved the Devices to an test-hardware and booted this
> system from an Arch Linux ISO, which I created for this purpose.
> 
> The Problem is:
> [ 1086.714109] BTRFS (device sdd1): parent transid verify failed on
> 209362944 wanted 293924 found 293922

   Try mounting with -o recovery, and see if that helps.

   Hugo.

> Is there any posibility to recover any files from this desaster?
> Is there any posibiolity to set the superblock to transid #293922 ?
> 
> See my tries to recover here as konsole log below.
> 
> 
> 
> 
> -x--x---x--x--
> BTRFS Tools Version: btrfs-progs v4.2
> 
> Kernel: Linux archiso 4.1.6-1-ARCH #1 SMP PREEMPT Mon Aug 17 08:52:28
> CEST 2015 x86_64 GNU/Linux
> 
> btrfs show
> Label: 'archiv'  uuid: 48f71e09-6898-4665-bc61-bd7ca4ba4a24
>   Total devices 4 FS bytes used 3.35TiB
>   devid1 size 1.70TiB used 726.69GiB path /dev/sdc3
>   devid2 size 1.82TiB used 1.35TiB path /dev/sdb1
>   devid3 size 1.82TiB used 1.35TiB path /dev/sda1
>   devid4 size 1.82TiB used 1.35TiB path /dev/sdd1
> 
> mount LABEL=archiv /mnt -o degraded,ro
> # dmesg
> [ 1086.691246] BTRFS info (device sdd1): allowing degraded mounts
> [ 1086.691251] BTRFS info (device sdd1): disk space caching is enabled
> [ 1086.714109] BTRFS (device sdd1): parent transid verify failed on
> 209362944 wanted 293924 found 293922
> [ 1086.752227] BTRFS (device sdd1): parent transid verify failed on
> 244719616 wanted 293924 found 293922
> [ 1086.754377] BTRFS: bdev /dev/sdb1 errs: wr 3, rd 0, flush 1, corrupt
> 0, gen 0
> [ 1086.754676] BTRFS (device sdd1): parent transid verify failed on
> 209375232 wanted 293924 found 293914
> [ 1086.770626] BTRFS (device sdd1): parent transid verify failed on
> 245538816 wanted 293924 found 293922
> [ 1086.912646] BTRFS (device sdd1): parent transid verify failed on
> 253378560 wanted 293924 found 293914
> [ 1086.942088] BTRFS (device sdd1): parent transid verify failed on
> 253390848 wanted 293924 found 293914
> [ 1086.944003] BTRFS (device sdd1): parent transid verify failed on
> 253403136 wanted 293924 found 293914
> [ 1087.262500] BTRFS (device sdd1): parent transid verify failed on
> 253911040 wanted 293924 found 293914
> [ 1087.264800] BTRFS (device sdd1): bad tree block start 0 253911040
> [ 1087.266442] BTRFS: Failed to read block groups: -5
> [ 1087.315127] BTRFS: open_ctree failed
> 
> # btrfs-find-root /dev/sda1
> Superblock thinks the generation is 293924
> Superblock thinks the level is 2
> Found tree root at 244273152 gen 293924 level 2
> Well block 238604288(gen: 293923 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 199577600(gen: 293922 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 199786496(gen: 293921 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 199925760(gen: 293919 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 209240064(gen: 293914 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 182116352(gen: 293913 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 179388416(gen: 293912 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 238559232(gen: 293911 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 237764608(gen: 293911 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 175108096(gen: 293910 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 74981376(gen: 293909 level: 2) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 156815360(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 156807168(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 156803072(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 156688384(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 153407488(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 149504000(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 149499904(gen: 293908 level: 0) seems good, but
> generation/level doesn't match, want gen: 293924 level: 2
> Well block 149078016(gen: 293908 level: 0) seems