On Mon, 2020-12-07 at 12:52 +0100, Vitaly Wool wrote: > > Thanks. This trace beats me because I don't quite get how this could > have happened. I swear there's a mythical creature loose in there somewhere ;-) Everything looks just peachy up to the instant it goes boom, then you find in the wreckage that which was most definitely NOT there just a few ns ago. > Hitting write_unlock at line 341 would mean that HANDLES_ORPHANED bit > is set but obviously it isn't. > Could you please comment out the ".shrink = z3fold_zpool_shrink" line > and retry? Unfortunately, that made zero difference. -Mike