I have a pool in the same state. I deleted a file set that was compressed and deduped and had a bunch of zero blocks in it. The delete ran for a while and then it hung. Trying to import with any combination of -f or -fF or -fFX gives the same results you guys get. zdb -eud shows all my file sets and the one I deleted gives error 16 inconsistent data. My pool has 12 750GB drives with 2 vdevs 6 drives in each raidz2 set. I have 12GB ram and a corei7. When I run the import it can return as fast as a few hours or as long as 3 days depending on the options I choose. Each run does end with a system hang. At some points all 8 logical cpus are running at 50% for hours. I don't mind rolling back to a previous consistent state, just need some help getting it right. I started on snv_128 and since have upgraded to 129. Haven't tried 130 yet. I tried limiting the arc size according to another post and it just took longer to get to the system hang.
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