linux-kernel - invalid process utime

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Message-Id: <201004010349.44199.mihai.dontu@gmail.com>
Date:	Thu, 1 Apr 2010 03:49:43 +0300
From:	Mihai Donțu <mihai.dontu@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: invalid process utime

Hi,

I started the postgresql daemon on my laptop, gave it a big query to chew and 
then ran 'top' to see it struggle, when I noticed that several of my processes 
had crazy utime-s. I selected the postgres one for exemplification:

$ cat /proc/5623/stat
5623 (postgres) S 1 5623 5623 0 -1 4202560 4340 1644345 5 92 39 1844674407336 
92886 1844674402728 20 0 1 0 25983879 100798464 1302 18446744073709551615 
4194304 8513148 0 0 0 0 0 19935232 84487 18446744073709551615 0 0 17 1 0 0 0 0 
0

$ ps -p 5623 x
postgres  5623 39289650  0.1 98436 5208 ?      Ss   02:31 21114581:29 
/usr/lib64/postgresql-8.4/bin/postgres --silent-mode=true

$ ps aux | grep "21114581:" | wc -l
152

$ uptime
03:40:07 up 3 days,  1:18,  9 users,  load average: 0.75, 0.74, 1.04

$ uname -a
Linux mdontu-dell 2.6.33.1 #4 SMP PREEMPT Mon Mar 22 04:06:35 EET 2010 x86_64 
Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz GenuineIntel GNU/Linux

(vanilla kernel + tuxonice patches)

The system time looks accurate though and, sadly, I have no idea how to 
reproduce this. I attached a compressed dmesg dump because it was pretty big.

Thanks,

-- 
Mihai Donțu

Download attachment "dmesg.log.gz" of type "application/x-gzip" (30635 bytes)