kern/144330: mbuf leakage in nfsd with zfs

Gerrit Kühn gerrit at
Fri Feb 26 21:40:02 UTC 2010

>Number:         144330
>Category:       kern
>Synopsis:       mbuf leakage in nfsd with zfs
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Feb 26 21:40:02 UTC 2010
>Originator:     Gerrit Kühn
>Release:        8-stable as of 24th of Feb
FreeBSD 8.0-STABLE FreeBSD 8.0-STABLE #2: Fri Feb 26 14:15:47 CET 2010     root at  amd64

When serving nfs dirs from a zfs storage, mbuffers keep being drained, but are never freed. See as an example. y-axis is output of total mbuf clusters by netstat -m, x-axis is time in minutes. The flat region in the upper right corner corresponds to approx. 10min with nfsd turned off.
Several others report similar problems (see thread on -stable with topic "mbuf leakage with nfs/zfs? (was: em0 freezes on ZFS server)").
Server nfs-dirs from zfs storage with 8-stable and monitor mbuf usage.
Unknown, but urgently needed. :-)


More information about the freebsd-bugs mailing list