FreeBSD 16.0-CURRENT nfsd causes kernel panic when ms-nfs41-client runs WinZFS from file
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- Reply: Rick Macklem : "Re: [Ms-nfs41-client-devel] FreeBSD 16.0-CURRENT nfsd causes kernel panic when ms-nfs41-client runs WinZFS from file"
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Date: Tue, 16 Jun 2026 08:41:33 UTC
FreeBSD NFSD causes repeated kernel panics with ms-nfs41-client, but only if we run a Windows OpenZFS zpool from a NFS filesystem. Steps to use OpenZFS on NFS (I've send the instructions to Roland): cd nfs_subdir_on_freebsd26 truncate -s $((512*1024*1024*1024)) poolfile1.bin chmod a+rw poolfile1.bin zpool.exe create -o ashift=15 -o autotrim=on -O casesensitivity=insensitive -O driveletter=Z nfspool1 "\\\\?\\$(cygpath -w "$PWD/poolfile1.bin")" The ZFS filesystem on Windows works for a while until the FreeBSD kernel drops into the kernel debugger prompt, warning that NFSD had become unresponsive. How can I debug this? FreeBSD version: FreeBSD 16.0-CURRENT installed from FreeBSD-16.0-CURRENT-amd64-20260505-8e8d87856241-285702 uname -a FreeBSD fbsd7283 16.0-CURRENT FreeBSD 16.0-CURRENT main-n285769-1d24638d3e88 GENERIC amd64 Delegations are ENABLED for nfsd. Windows version: Win11 OpenZFS version: https://github.com/openzfsonwindows/openzfs/releases/download/zfswin-2.4.1rc11/OpenZFSOnWindows-debug-2.4.1rc11b.exe ms-nfs41-client version: ms-nfs41-client-release-2026-06-01 Aurélien -- Aurélien Couderc <aurelien.couderc2002@gmail.com> Big Data/Data mining expert, chess enthusiast