Bug#1072573: rpc.idmapd runs out of file descriptors

From	Sergio Gelato <sergio.gelato@astro.su.se>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1072573: rpc.idmapd runs out of file descriptors
Date	2024-06-04 17:20 +0200
Message-ID	<ILE77-yU3-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: nfs-common
Version: 2.6.2-4
Severity: important
Tags: patch upstream

On some of our bookworm systems I've seen what looked like a file descriptor leak. Sample lsof output:

[...]
rpc.idmap 675 root  126r      DIR               0,40        0      10813 /run/rpc_pipefs/nfs/clnt11e6 (deleted)
rpc.idmap 675 root  127u     FIFO               0,40      0t0      10817 /run/rpc_pipefs/nfs/clnt11e6/idmap (deleted)
rpc.idmap 675 root  128r      DIR               0,40        0      10834 /run/rpc_pipefs/nfs/clnt11ef (deleted)
rpc.idmap 675 root  129u     FIFO               0,40      0t0      10838 /run/rpc_pipefs/nfs/clnt11ef/idmap (deleted)
rpc.idmap 675 root  130r      DIR               0,40        0      10855 /run/rpc_pipefs/nfs/clnt11f8 (deleted)
rpc.idmap 675 root  131u     FIFO               0,40      0t0      10859 /run/rpc_pipefs/nfs/clnt11f8/idmap (deleted)

Cranking up the verbosity level to 3 showed that dirscancb never reaps stale entries in its queue (no "Stale client" lines). The reason turns out to be that the scan terminates on the first directory entry that doesn't contain an "idmap" file. Applying the attached patch seems to have solved the problem for me.

As far as I can tell the bug is still present upstream, and has been for many years (that "goto out" is from 2007 and replaced a "return" so the bug is even older than that).

Marking "important" since this has actually caused observable problems in our environment.

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Bug#1072573: rpc.idmapd runs out of file descriptors Sergio Gelato <sergio.gelato@astro.su.se> - 2024-06-04 17:20 +0200
  Bug#1072573: rpc.idmapd runs out of file descriptors Salvatore Bonaccorso <carnil@debian.org> - 2024-06-05 16:20 +0200
  Bug#1072573: marked as done (rpc.idmapd runs out of file descriptors) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-09-20 21:00 +0200

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