Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-07-01 Thread Chris Bannister
On Sun, Jul 01, 2012 at 08:42:02AM +, Camaleón wrote:
> My "lennies" (2.6.26) are only reporting in both dmesg and kernel logs:
> 
> "Clock: inserting leap second 23:59:60 UTC"

Mmmm interesting...

root@tal:~# dmesg | grep leap
root@tal:~#

root@tal:~# less /var/log/dmesg.0 | grep leap
root@tal:~#

root@tal:~# zless /var/log/dmesg.?.gz | grep leap
root@tal:~#

root@tal:~# uname -a
Linux tal 3.2.0-2-686-pae #1 SMP Fri Jun 1 18:56:14 UTC 2012 i686 GNU/Linux

No wonder my clock is wrong :)

-- 
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who are being oppressed, and loving the people who are doing the 
oppressing." --- Malcolm X


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Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-07-01 Thread Joe
On Sat, 30 Jun 2012 21:52:21 +
Andy Smith  wrote:

> Hello,
> 
> Has anyone been seeing this sort of thing in the last 22-ish hours?
> 
> http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-today
> 
> I've run adjtimex -p on all of my servers and they're all reporting
> status 17, which as far as I can tell means they've already been sent
> adjtimex()by ntpd and will add a leap second at midnight.
> 
> As I understand the reports so far, the livelock would happen at the
> point where ntpd sends the adjtime(), soif they haven't locked
> already then they aren't going to.
> 

I didn't find out about this until last night, when I shut down ntpd on
the two Squeeze machines I look after. Obviously that was far too late,
as both machines did the leap-second thing at midnight, and neither had
been affected by the problem.

I've since seen it described as the result of a race hazard, so it
would seem to be a matter of chance whether a particular machine had a
problem.

-- 
Joe


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Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-07-01 Thread Henrique de Moraes Holschuh
On Sat, 30 Jun 2012, Andy Smith wrote:
> Has anyone been seeing this sort of thing in the last 22-ish hours?
> 
> http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-today

No problems with the kernel in _up-to-date_ Debian userspace and kernels, at
least in stable.  I will know about oldstable on monday.

Now, I've had a few java apps get a bit crazy, might have been this:
https://lkml.org/lkml/2012/6/30/122

And it happened on latest kernel 3.0, so if it indeed is the hrtimers issue,
it is on more kernels than just 3.4.4/3.5.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh


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Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-07-01 Thread Jari Fredriksson
On Sun, July 1, 2012 11:42, Camaleón wrote:
> On Sat, 30 Jun 2012 21:52:21 +, Andy Smith wrote:
>
>> Has anyone been seeing this sort of thing in the last 22-ish hours?
>>
>> http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-today
>
> (...)
>
> Mmm, interesting.
>
> My "lennies" (2.6.26) are only reporting in both dmesg and kernel logs:
>
> "Clock: inserting leap second 23:59:60 UTC"
>
> But nothing more, all is running fine here, no kernel locked.

Same here. Squeeze * 3 + Ubuntu 12.04 LTS * 2. All running ntpd, but no
problems.




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Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-07-01 Thread Camaleón
On Sat, 30 Jun 2012 21:52:21 +, Andy Smith wrote:

> Has anyone been seeing this sort of thing in the last 22-ish hours?
> 
> http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-today

(...)

Mmm, interesting.

My "lennies" (2.6.26) are only reporting in both dmesg and kernel logs:

"Clock: inserting leap second 23:59:60 UTC"

But nothing more, all is running fine here, no kernel locked.

Greetings,

-- 
Camaleón


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Re: Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-06-30 Thread Andrew Reid
> Hello,
> 
> Has anyone been seeing this sort of thing in the last 22-ish hours?
> 
> http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates
> -of-linux-server-crashes-today

  I saw the buzz about this on Slashdot, but as far as I can tell 
none of my systems are having any problems.  I have several 
Debian "squeeze" 2.6.32 64-bit systems, a mix of file servers,
cluster nodes, and desktop workstation systems.  I'm off-site,
it being the weekend, but there's no evidence of trouble.

  I did see a lot of log traffic at "23:59:60" UTC, so the kernels
have the info.  If they're going to lock up at local midnight,
well, I guess I'll find out in half an hour.

   -- A.
--
Andrew Reid / rei...@bellatlantic.net


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Reports of (Debian?) Linux kernel 2.6.32 livelocking when notified of leap second

2012-06-30 Thread Andy Smith
Hello,

Has anyone been seeing this sort of thing in the last 22-ish hours?

http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-today

I've run adjtimex -p on all of my servers and they're all reporting
status 17, which as far as I can tell means they've already been sent
adjtimex()by ntpd and will add a leap second at midnight.

As I understand the reports so far, the livelock would happen at the
point where ntpd sends the adjtime(), soif they haven't locked
already then they aren't going to.

Cheers,
Andy


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