linux-kernel - Re: [BUG] jiffies counter leaps in 2.6.24-rc3

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Message-Id: <200711241948.58881.rjw@sisk.pl>
Date:	Sat, 24 Nov 2007 19:48:58 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Stefano Brivio <stefano.brivio@...imi.it>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Michael Buesch <mb@...sch.de>
Subject: Re: [BUG] jiffies counter leaps in 2.6.24-rc3

On Saturday, 24 of November 2007, Stefano Brivio wrote:
> It looks like the jiffies counter sometimes jumps back and forth of some
> hundreds seconds in 2.6.24-rc3. I observed that this happens when I use the
> su(1) command, e.g.:
> 
> Nov 24 06:17:17 morte [190769.065301] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 232 (6730/29)
> Nov 24 06:17:22 morte su[16826]: Successful su for root by st3
> Nov 24 06:17:22 morte su[16826]: + pts/1 st3:root
> Nov 24 06:17:22 morte su(pam_unix)[16826]: session opened for user root by (uid=1000)
> Nov 24 06:17:38 morte [715682.606983] b43-phy2 ERROR: PHY transmission error
> Nov 24 06:18:17 morte [715707.765415] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 194 (970/5)
> 
> or
> 
> Nov 23 20:55:40 morte [627074.320296] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 10 (550/55)
> Nov 23 20:56:01 morte su[5452]: Successful su for root by st3
> Nov 23 20:56:01 morte su[5452]: + pts/4 st3:root
> Nov 23 20:56:01 morte su(pam_unix)[5452]: session opened for user root by (uid=1000)
> Nov 23 20:56:03 morte su(pam_unix)[5452]: session closed for user root
> Nov 23 20:56:40 morte [167187.102931] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 10 (40/4)
> 
> or
> 
> Nov 23 06:31:00 morte [156536.124549] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 240 (6480/27)
> Nov 23 06:31:58 morte su[4350]: Successful su for root by st3
> Nov 23 06:31:58 morte su[4350]: + pts/0 st3:root
> Nov 23 06:31:58 morte su(pam_unix)[4350]: session opened for user root by (uid=1000)
> Nov 23 06:32:09 morte [587438.574530] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 240 (4080/17)
> 
> (I checked with a clock the timestamp prepended by syslog-ng, and it's
> correct.)
> 
> I'm thinking this could be somehow related to the setpriority() call made
> by su(1), but I don't know how to debug this further. Any clue?

NO_HZ?  Highres timers?

I understand that the previous kernels behave correctly.  All of them?

Rafael
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