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Multiple threads racing to automount the same snapshot can both spawn mount helper processes that successfully complete, causing both parent threads to attempt AVL tree registration and triggering a VERIFY() panic in avl_add(). This occurs because the fsconfig/fsmount API lacks the serialization provided by traditional mount() via lock_mount(). The fix adds a per-entry mutex (se_mtx) to zfs_snapentry_t that serializes mount and unmount operations on the same snapshot. The first mount thread creates a pending entry with se_spa=NULL and holds se_mtx during the helper execution. Concurrent mounts find the pending entry and return success without spawning duplicate helpers. Unmount waits on se_mtx if a mount is pending, ensuring proper serialization. This allows different snapshots to mount in parallel while preventing the AVL panic. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #17943 |
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