Possible kqueue related issue on STABLE/RC.

Andriy Gapon avg at FreeBSD.org
Thu Sep 12 21:41:29 UTC 2013

on 12/09/2013 21:49 Konstantin Belousov said the following:
> On Thu, Sep 12, 2013 at 08:28:48PM +0200, Jimmy Olgeni wrote:
>> On Thu, 12 Sep 2013, Konstantin Belousov wrote:
>>> Might be, your issue is that some filesystems do not care about proper
>>> locking mode for the fifos.  UFS carefully disables shared locking for
>>> VFIFO, but it seems ZFS is not.  I can propose the following band-aid,
>>> which could help you.
>> This certainly seems to improve things. I have been running builds
>> for the past couple of hours without any critical problem.
> Ok, so it is ZFS indeed.  I think I will commit the band-aid to head
> shortly.

I am not sure if my message <5231A016.7060906 at FreeBSD.org> was intercepted by
NSA and didn't reach you...  At least I haven't seen any reaction to it.
So, ZFS does not need this band-aid.  If you think that it may be needed for
other filesystems or is useful in general, then okay.

Just in case, r254694 is not in releng/9.2 and I haven't seen any evidence that
Jimmy has tested a tree that included that commit.

>> I spotted a few LORs but nothing bad happened so far:
>>      http://olgeni.olgeni.com/~olgeni/dmesg-2013-09-12
> Out of curiousity, please look up the line for vm_object_terminate+0x1d8.
>> If it keeps working this way I hope there's still some time to fit it 
>> into an -RC.
> For 10.0 yes, 9.2 is sealed (hopefully).

Andriy Gapon

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