Hi, If I run blktests test zbd/009 on top of Jens' for-next branch (commit 6763582c1263 ("Merge branch 'block-6.17' into for-next")) then the test triggers a hang in btrfs_writepages(). The same test zbd/009 passes with older kernel versions (v6.16 and before). Other ZBD tests pass with the same kernel. Could this indicate a BTRFS regression? Thanks, Bart.