https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214955
Bug ID: 214955
Summary: rpc.lockd sends spurious NLM_UNLOCKs
Product: Base System
Version: 10.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 177543
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177543&action=edit
packet capture
We have encountered an issue reproducible on FreeBSD 10.3 with read-only NFS
mounts. FreeBSD is sending NLM_UNLOCKs when mounted read-only. This was
discovered because it triggers a bug in NetApp filers where it causes the file
to be truncated.
We can trigger this reliably when using clamscan to scan virus samples on a
readonly NFS mount.
Other FreeBSD versions have not been tested, but we did not believe this
happened in FreeBSD 9.3. I believe there was a lot of NFS related development
between 9.0 and 10.0, but I am not sure if this bug was introduced because of
those changes.
Attached is a pcap showing UNLOCKs sent.
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