13bacc7144
Unlike spa_async_thread that can get started only from spa_sync() spa_async_thread_vd can get started from other contexts. Additionally, spa_async_thread_vd does not really depend on spa sync being enabled. The incorrect assert could be triggered by importing a pool in the read-only mode and then disconnecting one of its disks. In this case spa_sync_on was false because the pool was read-only and spa_async_thread_vd was started to handle SPA_ASYNC_REMOVE event. Note: spa_async_thread_vd() currently exists only in FreeBSD, it was split out of spa_async_thread() in r253990. Discussed with: mav MFC after: 2 weeks
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