Richard,
I first reported on the bug on 2008-04-01. Apple responded on the same
day and on 2008-04-17, 2008-10-15, 2008-12-14, 2008-12-15, 2009-02-25,
2009-08-13, 2009-08-15, and 2009-09-28 (that was the last time I heard
from them). The bug ID is 5834488 and is still marked "Open".
The title of the bug is "fcntl$UNIX2003() hangs in Mac OS X 10.5 and 10.6".
I reported that the bug still exists in Mac OS X 10.6 on 2009-09-02.
I used Apple's bug-reporting site <https://bugreport.apple.com>.
The problem is that a process that's attempting to lock the
product-queue via a system call to fcntl() using the F_SETLKW (lock
wait) option hangs -- even if it's the only process doing any locking!
Interestingly, the bug does not exist in Mac OS X 10.4.
Regards,
Steve
On 10/28/2010 01:26 PM, Richard Ryan wrote:
> Hi,
>
> I'm curious about a few things. Did you report the bug to Apple
> and did they give you a reply? I'm interested in any reply they
> may have sent you. These are where I think those bugs are supposed
> to be submitted:
>
> http://www.apple.com/feedback/macosx.html
>
> http://www.apple.com/feedback/server.html
>
> Also I was wondering what fcntl operations broke.
>
> Thanks,
> Richard Ryan
>
>
> On 10/28/10 1:08 PM, Justin Greenfield wrote:
>> We experimented with running LDM on OS X, both Leopard and Snow Leopard.
>> Installation is fairly straightforward, I think we had to tweak a couple of
>> the perl scripts, but nothing difficult. When working, it works like a champ.
>>
>> But....
>>
>> The killer is there's a bug in OS X that locks up the product queue on a
>> call to fcntl. We tried various configurations, file systems, etc, to work
>> around this bug, for months and months.
>>
>> Sometimes it would hit the bug within a few hours of startup, sometimes it
>> would go for weeks before it locked up. But inevitably, it got hung up.
>> Sampling the process in this state always revealed the same thing: stuck in
>> the bowels of fcntl.
>>
>> We encountered it on 10.5 and 10.6. We wrote all kinds of scripts to detect
>> the hung process and restart the daemon, and they worked most of the time,
>> but sometimes the only solution was to reboot the machine.
>>
>> In the end, it just wasn't going to be reliable enough, which is a true
>> shame, because there are a lot of things we'd love to do with OS X. We gave
>> up and ported our stuff to run on linux.
>>
>> It's possible that a subsequent OS X update has fixed the issue, but I
>> wouldn't bet on it.
>>
>> Justin
>>
>>
>> On Oct 28, 2010, at 1:01 PM, Richard A. Ryan wrote:
>>
>>> Hi again,
>>>
>>> The last thing I wrote only mentioned how dscl replaces the
>>> /etc configurations. It turns out launchd/launchctl commands
>>> and files also replace some of the functionality of what's in
>>> /etc, and I'm guessing there are probably other things. The
>>> /etc/services file's functionality has something to do with
>>> launchd/launchctl rather than dscl.
>>>
>>> Again, for the Mac mini, if you want to do server type things
>>> on it you might want to get the Mac mini preloaded with
>>> Mac OS X Server because the user/group/account/networking/server
>>> related command line calls are a bit hard to figure out. The
>>> O'Reilly book ``Mac OS X for Unix Geeks'' doesn't seem to cover
>>> everything and they also don't have a version for Snow Leopard.
>>>
>>> Richard Ryan
>>>
>>>
>>>> -------- Original Message --------
>>>> Subject: [ldm-users] LDM on Mac OS X
>>>> Date: Wed, 27 Oct 2010 14:00:43 -0500
>>>> From: Tyler Allison <tyler@xxxxxxxxxxxxxxxx>
>>>> To: ldm-users@xxxxxxxxxxxxxxxx
>>>> Anybody running or been successful in running LDM on Mac OS X?
>>>> I'm considering playing with a MacMini as a small SOHO device running LDM.
>>>> I don't want to drop $1000 on a paper weight :) So hopefully someone
>>>> else has been there/done that.
>>>> -Tyler
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>>>
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>>
>
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