kern/135594: [zfs] Single dataset unresponsive with Samba

Martin Matuska mm at FreeBSD.org
Mon Jun 15 13:10:03 UTC 2009


>Number:         135594
>Category:       kern
>Synopsis:       [zfs] Single dataset unresponsive with Samba
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jun 15 13:10:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Martin Matuska
>Release:        FreeBSD 7.2-STABLE amd64
>Organization:
>Environment:
Release: 7.2-STABLE-amd64
ZFS: v13
Memory: 8GB
Samba: 3.2.10, 3.2.11

vfs.zfs.prefetch_disable="1"
>Description:
I experience hangs of a single ZFS dataset when under low load with samba.
Processes trying to operate on the dataset are stuck in ZFS state ("smbd", "ls", etc.), 
this applies to "zfs umount -f" as well. Other datasets operate without problems.

zfs list, set, etc. work correctly with this dataset.

A hard reset is required to have the system operating again.

This error happened on two systems with different datasets so it is reproducible,
I should try to define how to reproduce it.

How can I help debugging this problem?
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:


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