> then I do : mount -o rw,remount /backup/
>
> Feb  1 22:32:38 frozen kernel: [   65.780686] btrfs: force zlib compression
> Feb  1 22:32:38 frozen kernel: [   65.780700] btrfs: not using ssd allocation 
> scheme
> Feb  1 22:32:38 frozen kernel: [   65.780706] btrfs: disk space caching is 
> enabled
>
>
> I let that mount run days, without any success. It stay running, and I can't 
> interrupt it (CTRL+C or kill).

Hit alt-sysrq-w at that point, and then post your dmesg; there should
be at least one stacktrace in there (possibly many), which should give
a good idea where it's hanging up.
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