[Bug 269328] nfs client: data corruption using fspacectl and mmap
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Date: Sat, 04 Feb 2023 22:02:18 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269328 Bug ID: 269328 Summary: nfs client: data corruption using fspacectl and mmap Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org Attachment #239910 text/plain mime type: Created attachment 239910 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239910&action=edit Test program that triggers the error on the NFS client Similar to 269261, it is possible to trigger data corruption on an NFS client (In my setup, NFS 4.2 served by FreeBSD 13.1 backed by ZFS) by using fspacectl on an mmap()ed file. Steps to reproduce: 0) Install a Rust toolchain 1) checkout https://github.com/asomers/fsx-rs.git at rev c3e726d 2) cd fsx-rs 3) cargo build 4) Somehow mount an nfs file system 5) cat <<HERE > fsx.toml flen = 1048576 nomsyncafterwrite = true [opsize] max = 393216 [weights] read = 0 write = 0 mapread = 10 mapwrite = 10 truncate = 0 punch_hole = 10 HERE 6) cargo run -- -f fsx.toml -N 1000 -P /tmp -S 9361357600271583733 ~/tmp/fsx.bin Alternate steps to reproduce: 1) Compile the attached program 2) ./fspace-and-mmap /path/to/nfs_filesystem/x.bin" -- You are receiving this mail because: You are the assignee for the bug.