Re: `btrfsck: extent_io.c:612: free_extent_buffer: Assertion `!(eb->flags & 1)' failed.` in `btrfsck`

[Karl-Philipp Richter <krichter722@aol.de>]

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Hi,
I could `btrfsck --repair` the sparse file with Linux 3.15.6-utopic from
http://kernel.ubuntu.com/~kernel-ppa/mainline/ and btrfsck 3.12-1 (from
btrfs-tools package in Ubuntu 14.04).

Thanks for your hints, Wang!

All the best,
Karl

Am 18.07.2014 14:13, schrieb Wang Shilong:
> 
> Hi,
> 
> There are some patches for fsck flighting, they  are integrated  in David's branches.
> You can pull from David's latest branch, and see if it helps:
> 
> https://github.com/kdave/btrfs-progs  integration-20140704
> 
> Have a try and see if it helps anyway.
> 
> Thanks,
> Wang
> 
>> Hi together,
>> I'm experiencing the following issues when I invoke `btrfsck` on a
>> sparse file image with a GPT and one (the only) btrfs partition attached
>> to a loop device
>>
>>    $ sudo btrfsck --repair --init-csum-tree --init-extent-tree -b
>> /dev/loop0p1
>>    Incorrect local backref count on 128510738432 root 5 owner 3849475
>> offset 0 found 1 wanted 0 back 0xbab41270
>>    backpointer mismatch on [128510738432 4096]
>>    ref mismatch on [128510742528 12288] extent item 0, found 1
>>    btrfsck: extent_io.c:612: free_extent_buffer: Assertion `!(eb->flags
>> & 1)' failed.
>>
>>    $ sudo btrfsck --repair --init-csum-tree --init-extent-tree /dev/loop0p1
>>    Incorrect local backref count on 128510726144 root 5 owner 3849470
>> offset 0 found 1 wanted 0 back 0xbbcb9500
>>    backpointer mismatch on [128510726144 12288]
>>    ref mismatch on [128510738432 4096] extent item 0, found 1
>>    adding new data backref on 128510738432 root 5 owner 3849475 offset
>> 0 found 1
>>    Backref 128510738432 root 5 owner 3849475 offset 0 num_refs 0 not
>> found in extent tree
>>    Incorrect local backref count on 128510738432 root 5 owner 3849475
>> offset 0 found 1 wanted 0 back 0xbbcb9630
>>    backpointer mismatch on [128510738432 4096]
>>    ref mismatch on [128510742528 12288] extent item 0, found 1
>>    btrfsck: extent_io.c:612: free_extent_buffer: Assertion `!(eb->flags
>> & 1)' failed.
>>
>>    $ sudo btrfsck --repair /dev/loop0p1
>>    Incorrect local backref count on 130861096960 root 5 owner 22733727
>> offset 0 found 1 wanted 0 back 0xc7c7d170
>>    backpointer mismatch on [130861096960 8192]
>>    ref mismatch on [130861105152 8192] extent item 0, found 1
>>    btrfsck: extent_io.c:612: free_extent_buffer: Assertion `!(eb->flags
>> & 1)' failed.
>>
>>    $ sudo btrfsck --repair /dev/loop0p1
>>    Backref 130861096960 root 5 owner 22733727 offset 0 num_refs 0 not
>> found in extent tree
>>    Incorrect local backref count on 130861096960 root 5 owner 22733727
>> offset 0 found 1 wanted 0 back 0xc7f31170
>>    backpointer mismatch on [130861096960 8192]
>>    ref mismatch on [130861105152 8192] extent item 0, found 1
>>    btrfsck: extent_io.c:612: free_extent_buffer: Assertion `!(eb->flags
>> & 1)' failed.
>>
>> I'm using `btrfs-progs` 24cf4d8c3ee924b474f68514e0167cc2e602a48d on
>> Linux 3.16-rc5 (anything else, i.e. older versions, give me immediate
>> error after start because errornous file system)
>>
>> I'd like to know whether this (assertion) error is related to a bug or
>> missing feature in btrfs-progs and might be fixed at some point or
>> whether this might indicate a completely messed up btrfs.
>>
>> Best regards,
>> Karl-P. Richter
>>
> 


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