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FreeBSD-EN-10:01.freebsd Errata Notice
The FreeBSD Project
Topic: Various FreeBSD 8.0-RELEASE improvements
Category: core
Module: kern
Announced: 2010-01-06
Affects: FreeBSD 8.0-RELEASE.
Corrected: 2010-01-06 21:45:30 UTC (RELENG_8_0, 8.0-RELEASE-p2)
For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:http://security.FreeBSD.org/>.
I. Background
Since FreeBSD 8.0 was released, several stability and performance problems
have been identified. This Errata Notice describes several fixes judged to
be of particular importance, but low risk, to users with specific workloads
or using specific features that trigger these problems.
Areas where problems are addressed include NFS, ZFS, Multicast networking,
SCTP as well as the rename(2) syscall.
II. Description
* Slow NFS client reconnects when using TCP
Under certain circumstances the NFS client can queue requests even though
the remote server has initiated a connection shutdown.
The deferred notice of the shutdown can cause slow reconnects against
an NFS server that drops inactive connections.
* Possible panics in ZFS
Due to inadequate checks, attempts to modify a file on a read-only ZFS
snapshot will lead to a 'dirtying snapshot' kernel panic.
The system will also panic if ZFS is combined with a MAC policy supporting
file system labeling (e.g., mac_biba(4) or mac_mls(4)).
* Multicast regression and panic
Multicast filtering may not pass incoming IGMP messages if the group
has not been joined. User space routing daemons will therefore not see
all IGMP control traffic.
Further, the system will panic ...
