Package: htop
Version: 0.8.3-1
Severity: normal
Tags: patch
htop shows negative cpu usage time:
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
9785 user 20 0 325M 236M 1860 S 0.0 1.5 0:00.12 ./mprime
9792 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9796 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9797 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9798 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9781 user 30 10 325M 236M 1860 S 0.0 1.5 -596523h-14:-8 ./mprime
This is caused by an integer overflow. The high number is comming from the
Kernel: (e.g.)
user@kvm:~$ cat /proc/9781/task/9798/stat
9798 (mprime) R 4413 9781 4413 34824 9781 4202560 46384 0 4 0 13739580949
918902298809 0 0 39 19 6 0 46913565 341078016 60514 18446744073709551615
4194304 29585884 140735277536320 139701526982104 17369198 0 0 0 16386 0 0 0 -1
3 0 0 9183 0 0
918902298809 + 13739580949 is quite a large number (>2^31-1)
Int should actually be enough at that place.
>From 1f5d6f44731482f76262ee71179a1ded3a0bf737 Mon Sep 17 00:00:00 2001
From: Micha M. <mt...@web.de>
Date: Fri, 27 Jan 2012 22:00:43 +0100
Subject: [PATCH] Fix integer overflow
Without this fix I get something like:
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
9785 user 20 0 325M 236M 1860 S 0.0 1.5 0:00.12 ./mprime
9792 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9796 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9797 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9798 user 39 19 325M 236M 1860 R 0.0 1.5 -596523h-14:-8 ./mprime
9781 user 30 10 325M 236M 1860 S 0.0 1.5 -596523h-14:-8 ./mprime
After:
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
9781 user 30 10 325M 236M 1860 S 0.0 1.5 0:00.01 ./mprime
9785 user 20 0 325M 236M 1860 S 0.0 1.5 0:00.12 ./mprime
9792 user 39 19 325M 236M 1860 R 0.0 1.5 2590671h22:11 ./mprime
9796 user 39 19 325M 236M 1860 R 0.0 1.5 2581130h26:17 ./mprime
9797 user 39 19 325M 236M 1860 R 0.0 1.5 2562047h47:16 ./mprime
9798 user 39 19 325M 236M 1860 R 0.0 1.5 2590671h53:17 ./mprime
It looks like that there is a bug in the Linux Kernel:
user@kvm:~$ cat /proc/9781/task/9798/stat
9798 (mprime) R 4413 9781 4413 34824 9781 4202560 46384 0 4 0 13739580949
918902298809 0 0 39 19 6 0 46913565 341078016 60514 18446744073709551615
4194304 29585884 140735277536320 139701526982104 17369198 0 0 0 16386 0 0 0 -1
3 0 0 9183 0 0
user@kvm:~$ uname -a
Linux kvm 2.6.32-5-amd64 #1 SMP Thu Nov 3 03:41:26 UTC 2011 x86_64 GNU/Linux
user@kvm:~$
Signed-off-by: Micha M. <mt...@web.de>
---
Process.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/Process.c b/Process.c
index 8f3762c..0cc990f 100644
--- a/Process.c
+++ b/Process.c
@@ -236,7 +236,7 @@ static void Process_printTime(RichString* str, unsigned
long t) {
double jiffytime = 1.0 / jiffy;
double realTime = t * jiffytime;
- int iRealTime = (int) realTime;
+ long long iRealTime = (long long) realTime;
int hours = iRealTime / 3600;
int minutes = (iRealTime / 60) % 60;
--
1.7.0.4
-- System Information:
Debian Release: 6.0.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages htop depends on:
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libncurses5 5.7+20100313-5 shared libraries for terminal hand
htop recommends no packages.
Versions of packages htop suggests:
pn ltrace <none> (no description available)
pn strace <none> (no description available)
-- no debconf information
--
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