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eec8164771
Disable the normal reclaim path for the txg_sync thread. This ensures the thread will never enter dmu_tx_assign() which can otherwise occur due to direct reclaim. If this is allowed to happen the system can deadlock. Direct reclaim call path: ->shrink_icache_memory->prune_icache->dispose_list-> clear_inode->zpl_clear_inode->zfs_inactive->dmu_tx_assign