# OpenZFS zfs-2.4.1

- Product: OpenZFS (https://whatsnew.fyi/product/openzfs)
- Vendor: OpenZFS
- Date: 2026-02-25
- Version: zfs-2.4.1
- Original notes: https://github.com/openzfs/zfs/releases/tag/zfs-2.4.1
- Permalink: https://whatsnew.fyi/product/openzfs/releases/zfs-2.4.1
- 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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- **fixed** — Fix available space accounting for special/dedup
- **fixed** — Fix activating large_microzap on receive
- **changed** — Improve caching for dbuf prefetches
- **fixed** — Flush RRD only when TXGs contain data
- **fixed** — Fix send:raw permission for send -w -I
- **changed** — Linux 6.19 compat: in-tree build: fix duplicate GCM assembly functions
- **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
- **fixed** — Fix build for Linux 6.18 with PowerPC/RISC-V kernels
- **fixed** — Fix history logging for zpool create -t
- **fixed** — Remove thread unsafe debug code causing FreeBSD double free panic
- **fixed** — Fix --enable-invariants on FreeBSD
- **fixed** — DDT: Add locking for table ZAP destruction
- **fixed** — When receiving a stream with the large block flag, activate feature
- **fixed** — Fix zfs_open() to skip zil_async_to_sync() for the snapshot
- **added** — cmd/zfs: clone: accept -u to not mount newly created datasets
- **added** — zdb: Add -O option for -r to specify object-id
- **fixed** — DDT: Fix compressed entry buffer size
- **fixed** — zpool: fix conflict with -v and -o options

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

###### Changes
- Fix available space accounting for special/dedup (#18222) #18190 #18222
- CI: Test & fix Linux ZFS built-in build #18234
- Linux 6.19 compat: in-tree build: fix duplicate GCM assembly functions #18204 #18224
- zfs_vnops_os.c: Move a vput() to after zfs_setattr_dir()
- Fix activating large_microzap on receive #18143 #18144
- Improve caching for dbuf prefetches #18160
- Flush RRD only when TXGs contain data #18082 #18138
- Fix `send:raw` permission for send `-w -I` #18198 #18193
- ZTS: Fix zed_synchronous_zedlet #18192 #18196
- Linux 6.19 compat: META #18197
- CI: Test build Lustre against ZFS #18161
- Include missing newline in 'man' error #18183
- 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
- Fix build for Linux 6.18 with PowerPC/RISC-V kernels. (#18145)
- Linux 6.19: handle --werror with CONFIG_OBJTOOL_WERROR=y #18152
- CI: Add Alpine Linux 3.23 runner to the pipeline (#18087)
- cmd/ztest: avoid `PATH_MAX` stack allocation in `ztest_get_zdb_bin()` (#18085)
- zed.d, contrib: fix shellcheck errors in scripts
- zfs_main: cosmetic: add missing flag to the comment for create
- CI: Test 2.4.x in qemu-test-repo-vm.sh, quick mode #18070
- Change shellcheck and checkbashism triggers. #18000
- Replace bashisms in ZFS shell function stub. #18000
- Make lines stay within 80 char limit. #18000
- Add some comments to clarify the mounting of filesystems. #18000
- Standardise if/then/else and for/do/done lines. #18000
- Add missing initrd config variables. #18000
- Remove unnecessary sourcing of variables. #18000
- Fix issue with finding degraded pool(s). #18000
- Prefix all variables that are local with underscore. #18000
- Shell script good practices changes. #18000
- Fix potential global variable overwrite. #18000
- zpool: fix conflict with -v and -o options
- CI: Fix qemu-1-setup failure, remove debug stuff #18166
- CI: Use Ubuntu mirrors instead of azure (#18057) #18057
- nvpair: chase FreeBSD xdrproc_t definition #18154
- Make sure we can still write data to txg #18139
- Lock db_mtx around arc_release() in couple places #18146
- remove thread unsafe debug code causing FreeBSD double free panic #18140
- FreeBSD: Remove references to DEBUG_VFS_LOCKS #18136
- FreeBSD: unbreak compilation on i386 #18096
- Fix --enable-invariants on FreeBSD #18131
- Fix history logging for `zpool create -t` #18118 #18102
- DDT: Add locking for table ZAP destruction #18115
- Add fh_to_parent export definition #18099
- spl: remove a _KERNEL check #18117
- spl: unexport kstat_proc_entry functions #18117
- spl: lift 64-bit math compat out to separate file #18117
- spl: remove old atomic lock #18117
- icp: emit .note.GNU-stack section for all ELF targets #18119
- When receiving a stream with the large block flag, activate feature #18105
- Fix zfs_open() to skip zil_async_to_sync() for the snapshot #18091
- ZTS: add regression test for #17180 #18109
- Rename several printf attributes declarations to __printf__ #18095
- Add handling for STATX_CHANGE_COOKIE #18097
- kmem: don't add __GFP_RECLAIMABLE for KM_VMEM allocations #18107
- cmd/zfs: clone: accept `-u` to not mount newly created datasets #18080
- kmem: don't add __GFP_COMP for KM_VMEM allocations #18053
- kmem: don't pass __GFP_HIGHMEM to __vmalloc #18053
- Linux 6.19: replace i_state access with inode_state_read_once() #18053
- Use reduced precision for scan times #18061
- Reduce minimal scrub/resilver times #18060
- zdb: Add -O option for -r to specify object-id #16307
- Fix rangelock test for growing block size #18064

_[Truncated at 4000 characters — full notes: https://github.com/openzfs/zfs/releases/tag/zfs-2.4.1]_