kern/136601: tar: Couldn't list extended attributes: Read-only file system

[KOIE Hidetaka]

>Number:         136601
>Category:       kern
>Synopsis:       tar: Couldn't list extended attributes: Read-only file system
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 09 05:00:13 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     KOIE Hidetaka
>Release:        8.0-BETA1
>Organization:
SURIGIKEN
>Environment:
FreeBSD guriandgura 8.0-BETA1 FreeBSD 8.0-BETA1 #0: Wed Jul  8 14:02:33 JST 2009     koie at guriandgura:/usr/obj/usr/src/sys/GURIANDGURA  amd64
>Description:
cd .zfs/snapshot/...
koie at guriandgura% env - tar cf /dev/null Makefile
tar: Couldn't list extended attributes: Read-only file system
koie at guriandgura%

truss says:
__acl_get_file(0x800f140a0,0x2,0x800f72000,0x0,0x1000,0x800f00ae8) ERR#45 'Operation not supported'
extattr_list_link(0x800f140a0,0x1,0x0,0x0,0x8e008,0x800f00ad0) ERR#30 'Read-only file system'

ktrace says:
  8662 bsdtar   CALL  __acl_get_file(0x800f140a0,ACL_TYPE_ACCESS,0x800f72000)
  8662 bsdtar   NAMI  "Makefile"
  8662 bsdtar   RET   __acl_get_file -1 errno 45 Operation not supported
  8662 bsdtar   CALL  extattr_list_link(0x800f140a0,0x1,0,0)
  8662 bsdtar   NAMI  "Makefile"
  8662 bsdtar   RET   extattr_list_link -1 errno 30 Read-only file system
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: