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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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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.