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Date: Tue, 10 Mar 2009 21:14:11 -0700
From: Tim Kientzle <kientzle@freebsd.org>
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To: Anonymous <swell.k@gmail.com>
References: <200903100104.53847.ken__6247.10998167775$1236647281$gmane$org@mthelicon.com>	<86mybuasss.fsf@gmail.com>	<200903101238.20974.paul@fletchermoorland.co.uk>	<86sklldth2.fsf@gmail.com>
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Cc: freebsd-current@freebsd.org
Subject: ZFS/amd64/extattr lockup (was Re: bsdtar lockup on
	Current-03/10/2009)
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Anonymous wrote:
> Tim Kientzle <kientzle@freebsd.org> writes:
>>Anonymous wrote:
>>>Paul Wootton <paul@fletchermoorland.co.uk> writes:
>>>
>>>>Im also using ZFS and have the same problems as Peg when trying to create a
>>>>tar file.
>>>>This is using Current as of last yesterday (09-mar-09).
>>>
>>>I'm not sure but in my case ktrace shows extattr_list_link() before the lockup.
>>>So, for a workaround I disabled extattr support in libarchive. Can you verify that
>>>this helps you, too?
>>
>>Please try this, which will poke that same system
>>call in a different way:
>>
>> rm -f foo foolink
>> touch foo
>> ln -s foo foolink
>> lsextattr -h user foolink
> 
> Right here.

So lsextattr -h hangs for you on AMD64 using ZFS with
a file that has no extended attributes.

I've not been able to reproduce it on i386 with UFS
(though I'm about a week out-of-date; I'm updating now).

Please try this on a UFS volume so we can figure
out whether this is an AMD64 problem or a ZFS problem.
(format a floppy or a USB key or a swap-backed ramdisk, maybe?)

Tim