On Feb 13, 2020 at 22:01, Qu Wenruo wrote:
> On 2020/2/13 上午8:26, Qu Wenruo wrote:
>> On 2020/2/13 上午5:58, Samir Benmendil wrote:
>>> I've been getting the following "BTRFS errors" for a while now, the 
>>> wiki [0] advises to report such occurrences to this list.
>> 
>> Please provide the following dump:
>> 
>> # btrfs ins dump-tree -b 194756837376 /dev/sda2
>> # btrfs ins dump-tree -b 194347958272 /dev/sda2
>>> 
>>> BTRFS critical (device sda2): corrupt leaf: root=466 block=194756837376
>>> slot=72 ino=1359622 file_offset=475136, extent end overflow, have file
>>> offset 475136 extent num bytes 18446744073709486080
> 
> 	item 72 key (1359622 EXTENT_DATA 475136) itemoff 11140 itemsize 53
> 		generation 954719 type 1 (regular)
> 		extent data disk byte 0 nr 0
> 		extent data offset 0 nr 18446744073709486080 ram 18446744073709486080
> 		extent compression 0 (none)
> 
> Also obvious underflow.
> 
>>> BTRFS critical (device sda2): corrupt leaf: root=466 block=194347958272
>>> slot=131 ino=1357455 file_offset=1044480, extent end overflow, have file
>>> offset 1044480 extent num bytes 18446744073708908544
> 
> 	item 131 key (1357455 EXTENT_DATA 1044480) itemoff 6497 itemsize 53
> 		generation 952602 type 1 (regular)
> 		extent data disk byte 0 nr 0
> 		extent data offset 0 nr 18446744073708908544 ram 18446744073708908544
> 		extent compression 0 (none)
> 
> As you can see, 18446744073708908544 = -653072, which means it overflows.
> 
> Both look like a bug in older kernels.
> 
> Since currently btrfsprogs can't detect nor fix it yet, the only way is
> to delete the offending files.
> 
> You can use the inode number 1357455, and root id 466 to locate the
> offending files, and delete it using older kernels.
> (root id is your subvolume id, which is shown in `btrfs subv list`.
> inode number can be passed to `find` command using `-inum` option)

I deleted the offending file for inode 1357455 using kernel 4.4.165.

However `find` did not return any results for inode 1359622. The newer 
kernel doesn't seem to complain about that anymore though.

Thank you for you help Qu.

Regards
Samir