Description of problem: server has FUSE filesystem server exports said FS through KNFSD client mounts file system using NFS4 client cannot create new files with open(filename,O_EXCL) -- the syscall returns -EPERM but the file is created, mode 000. client mounts file system using NFS3 if the file system is large enough, then eventually /usr/bin/find and other applications start experiencing ESTALE errors. How reproducible: Always Steps to Reproduce: Create a ZFS-FUSE file system Export via NFS Mount said export in a client, fstype nfs4 Try to cp a file into it -- see it fail Mount the same export with fstype nfs3 Ensure that the exported file system has LOTS of files (many thousands) Do a couple finds in the mountpoint. After a while you should start seeing Stale NFS file handle errors. Now export a regular in-kernel file system and mount that on the client, either with nfs3 or nfs4. That works flawlessly. I tested ext4, ext2 and tmpfs. Additional info: This happens either with the Fedora kernels or kernel 2.6.35 vanilla, both in the client and in the server, or in any combination between both machines.
More info here: http://groups.google.com/group/zfs-fuse/tree/browse_frm/thread/767dec5dd628d839/45d14c213613741f?rnum=11&q=nfs+problems&_done=%2Fgroup%2Fzfs-fuse%2Fbrowse_frm%2Fthread%2F767dec5dd628d839%2F45d14c213613741f%3Flnk%3Dgst%26q%3Dnfs%2Bproblems%26#doc_230660389d18e348
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