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It's unsafe to drain the iput taskq while holding the z_teardown_lock as a writer. This is because when the last reference on an inode is dropped it may still have pages which need to be written to disk. This will be done through zpl_writepages which will acquire the z_teardown_lock as a reader in ZFS_ENTER. Therefore, if we're holding the lock as a writer in zfs_sb_teardown the unmount will deadlock. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chris Dunlop <chris@onthe.net.au> Closes #1988 |
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