ZFS bug causing kernel panic when accessing snapshots - fix in OpenZFS v2.4.0, is there a simple upgrade?

yourfate

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Jan 2, 2026
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Since proxmox upgraded to zfs 2.3.4 I'm having problems with accessing snapshots, it causes kernel panics, making the access hang indefinitely.

Part of my backup strategy is automated backups for container snapshots, but this is broken by this ZFS bug.

The fix: https://github.com/openzfs/zfs/pull/17943

The fix was merged into ZFS main in November, and is part of the OpenZFS v2.4.0 release.

Is there a simple way to upgrade to the newer ZFS (testing repo or something)?

Otherwise, I might have to build my own kernel for a while with newer ZFS. Is there already a good guide on this? I have run linux with custom kernels before, but now with root on ZFS, and not proxmox.

I have submitted a bug report at your bugzilla too: https://bugzilla.proxmox.com/show_bug.cgi?id=7199
 
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