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3/22/25 1:20 PM, John wrote: > > > On Saturday, March 22nd, 2025 at 10:49 AM, Chuck Lever wrote: >> >> I recommend bisecting between 6.6 and 6.12.19 to locate the culprit. >> >> When you have that information, open a bug on bugzilla.kernel.org under >> Filesystems/NFSD and attach your information there. > > Wish I could, but the way OpenWrt is designed, moving from one kernel branch to another is major undertaking often requiring months of tweaks 1,000s of patches, Makefiles, config files, etc. > > I have been reading up on NFSv4 and am wondering if there is a way to simply disable the callback function. Could that work-around this crash? > > Unfortunately, OpenWrt's nfs-kernel-server package does not ship nor use something like /etc/nfs.conf. At the link below you can see their init script to start nfsd. Many thank for any ideas. > > https://github.com/openwrt/packages/blob/master/net/nfs-kernel-server/files/nfsd.init > If this is a "product" kernel then you should approach the distributor first. I do not have the hardware, the binaries, the .config, or a cross compiler for whatever "Hardware name: iKOOLCORE R2Max/R2Max" is (guessing RPi ?) It would be helpful to get $ scripts/faddr2line fs/nfsd/nfs4callback.c \ nfsd4_probe_callback_sync+0x1094 although, IME, +1094 means the crash happened far outside of the nfs4callback.c source file. This: nfsd4_client_tracking_init+0x39/0x150 [nfsd] suggests that your distributor (or LTS) might be missing a fix for recent crashes that are due to incorrectly setting CONFIG_NFSD_LEGACY_CLIENT_TRACKING. I'm thinking of perhaps de71d4e211ed ("nfsd: fix legacy client tracking initialization") in particular, which does not appear to have been applied to v6.12.19. -- Chuck Lever