# OpenZFS zfs-2.3.6

- Product: OpenZFS (https://whatsnew.fyi/product/openzfs)
- Vendor: OpenZFS
- Date: 2026-02-25
- Version: zfs-2.3.6
- Original notes: https://github.com/openzfs/zfs/releases/tag/zfs-2.3.6
- Permalink: https://whatsnew.fyi/product/openzfs/releases/zfs-2.3.6
- Labels: Platforms: Linux

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — CI: Test & fix Linux ZFS built-in build
- **changed** — chksum: run 256K benchmark on demand, preserve chksum_stat_data
- **changed** — Linux 6.19 compat: META
- **changed** — nvpair: chase FreeBSD xdrproc_t definition
- **fixed** — Remove thread unsafe debug code causing FreeBSD double free panic
- **changed** — FreeBSD: Remove references to DEBUG_VFS_LOCKS
- **changed** — FreeBSD: Remove HAVE_INLINE_FLSL use
- **changed** — Linux 6.19: replace i_state access with inode_state_read_once()
- **changed** — Linux 6.18: generic_drop_inode() and generic_delete_inode() renamed
- **added** — linux/super: add tunable to request immediate reclaim of unused dentries
- **added** — linux/super: add tunable to request immediate reclaim of unused inodes
- **changed** — config: restore ZFS_AC_KERNEL_DENTRY tests
- **fixed** — Fix a declaration position of the nth_page
- **fixed** — Fix build for Linux 6.18 with PowerPC/RISC-V kernels
- **changed** — Linux 6.19: handle --werror with CONFIG_OBJTOOL_WERROR=y
- **added** — zhack: add 'action idle' subcommand
- **added** — zhack: add -G option to dump debug buffer
- **changed** — mmp: claim sequence id before final import
- **added** — mmp: add spa_load_name() for tryimport
- **changed** — Fix HIGHMEM/kmap API violation in zfs_uiomove_bvec_impl()

###### Supported Platforms
- **Linux**: compatible with 4.18 - 6.19 kernels
- **FreeBSD**: compatible with releases starting from 13.3+, 14.0+, 15.0+

###### Changes
- CI: Test & fix Linux ZFS built-in build #18234
- chksum: run 256K benchmark on demand, preserve chksum_stat_data #17945 #17946
- Linux 6.19 compat: META #18197
- nvpair: chase FreeBSD xdrproc_t definition #18154
- remove thread unsafe debug code causing FreeBSD double free panic #18140
- FreeBSD: Remove references to DEBUG_VFS_LOCKS #18136
- FreeBSD: Remove HAVE_INLINE_FLSL use #18004
- Linux 6.19: replace i_state access with inode_state_read_once() #18053
- Linux 6.18: generic_drop_inode() and generic_delete_inode() renamed
- linux/super: add tunable to request immediate reclaim of unused dentries
- control its behaviour. By default it continues the traditional #17746
- linux/super: add tunable to request immediate reclaim of unused inodes #17746
- config: restore ZFS_AC_KERNEL_DENTRY tests #17621
- Fix a declaration position of the nth_page. #18034
- Fix build for Linux 6.18 with PowerPC/RISC-V kernels. (#18145)
- Linux 6.19: handle --werror with CONFIG_OBJTOOL_WERROR=y #18152
- ZTS: update the relevant mmp test cases
- zhack: add "action idle" subcommand
- zhack: add -G option to dump debug buffer
- mmp: claim sequence id before final import
- mmp: add spa_load_name() for tryimport
- mmp: move "Starting import" log message
- mmp: further restrict mmp exported pool check
- spa_activity_check: narrow scope of MMP vars #17551
- Enable zhack to work properly with 4k sector size disks #17576
- Add allocation profile export and zhack subcommand for import #17576
- CI: Test build Lustre against ZFS #18161
- CI: Fix qemu-1-setup failure, remove debug stuff #18166
- CI: Add Alpine Linux 3.23 runner to the pipeline (#18087)
- ZTS: add mount_loopback to test zfs behind loop dev #17329
- CI: Test 2.4.x in qemu-test-repo-vm.sh, quick mode #18070
- CI: Add smatch static analysis workflow #17935
- ZIO: Set minimum number of free issue threads to 32 #17903
- Suppress some ashift warnings #17830
- Explicit set ashift for non-leaf vdevs #17826
- raidz_test: Restore rand_data protection #17977
- raidz_test: Fix ZIO ABDs initialization #17977
- raidz_test: Set io_offset reasonably #17977
- ZFS: Enable more logs for raidz_001_neg #17977
- CI: Use Ubuntu mirrors instead of azure (#18057) #18057
- CI: Change timeout values #18056
- CI: zfs-test-packages: Add in new repos #17956
- CI: Fix Ubuntu 22.01 rsend failures #18032
- CI: exclude signed-off-by/reviewed-by from 72 char limit #18030
- Fix HIGHMEM/kmap API violation in zfs_uiomove_bvec_impl() #15668 #18030
- Preserve LIFO ordering of kmap ops in abd_raidz_gen_iterate() #15668 #18030
- Fix interaction of abd_iter_map()/abd_iter_unmap() with HIGHMEM #15668 #18030
- Linux 6.18: META
- config/kmap_atomic: initialise test data
- zvol_id: make array length properly known at compile time
- Linux: bump -std to gnu11
- sha256_generic: make internal functions a little more private
- Linux 6.18: namespace type moved to ns_common
- Linux 6.18: replace write_cache_pages()
- Linux 6.18: block_device_operations->getgeo takes struct gendisk*
- Linux 6.18: convert ida_simple_* calls
- Linux 6.18: replace nth_page()
- linux: use sys/stat.h instead of linux/stat.h #17675
- config: Fix LLVM-21 -Wuninitialized-const-pointer warning (#17997) #17682 #17684