Your message dated Wed, 10 Aug 2022 12:19:03 +0000
with message-id <[email protected]>
and subject line Bug#896767: fixed in atop 2.7.1-2
has caused the Debian Bug report #896767,
regarding atop on stretch is being started with -R, which can overload high
trafficked hosts
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
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misconfiguration somewhere. Please contact [email protected]
immediately.)
--
896767: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=896767
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: atop
Version: 2.2.6-4
Severity: important
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
Context: Running a baremetal server with 512GB RAM + 10 SSDs disks + 16
Cores + MariaDB 10.1
This database is part of a farm, with other 2 hosts (which are running
Debian 8)
The running kernel is: 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3
(2018-03-02)
This host has been suffering mysterious connections errors happening
every 10 minutes.
During those errors, the following facts were observed:
* Connection errors (hosts not being able to connect to MySQL)
* Packet drops
* Multiple cores going to 100% usage every 10 minutes for some seconds.
* Same hosts on the farm (which receive the same traffic) running Debian
* 8 had no issues whatsoever
This is an ouput of mpstat -P ALL 1 during the errors (filtered to show
only the CPUs going to 100% of %USR:
02:20:04 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:05 PM 11 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:05 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:06 PM 2 0.00 0.00 100.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:07 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:08 PM 0 0.00 0.00 99.00 0.00 0.00 1.00 0.00
0.00 0.00 0.00
02:20:08 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:09 PM 13 95.00 0.00 2.00 0.00 0.00 0.00 0.00
0.00 0.00 3.00
02:20:09 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:10 PM 13 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:10 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:11 PM 4 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:11 PM 13 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:12 PM 13 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:12 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:13 PM 13 100.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
02:20:13 PM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %gnice %idle
02:20:14 PM 13 91.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 9.00
And this was captured during during each atop execution
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
9476 root 0 -20 29232 12300 3540 R 35.1 0.0 5:44.59 atop
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
9476 root 0 -20 29232 12300 3540 R 99.3 0.0 5:47.60 atop
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
9476 root 0 -20 31680 14672 3540 S 5.0 0.0 5:47.75 atop
On Debian 9, atop is being started by default as:
/usr/bin/atop -a -R -w /var/log/atop/atop_20180418 600
Whereas on Debian 8 it is started by default as:
/usr/bin/atop -a -w /var/log/atop/atop_20180424 600
Debian 8 hosts had no issues.
The difference is the -R option, which as per the documentation, it
could be a really expensive operation.
Quoting documentation:
Since gathering of all values that are needed to calculate the PSIZE is
a relatively time-consuming task, the 'R' key (or '-R' flag) should be
active. Gathering these values also requires superuser privileges
(otherwise '?K' is shown in the output).
Starting atop on Debian 9 without -R makes the host to have no problems.
This is a package change from Debian 8 to Debian 9.
As this option could lead to serious issues, specially on high trafficked
systems, -R should not be enabled by default (as done on Debian 8), or
at least a confirmation/warning should be shown while installing the package
-- System Information:
Debian Release: 9.4
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-6-amd64 (SMP w/16 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages atop depends on:
ii init-system-helpers 1.48
ii libc6 2.24-11+deb9u3
ii libncurses5 6.0+20161126-1+deb9u2
ii libtinfo5 6.0+20161126-1+deb9u2
ii lsb-base 9.20161125
ii zlib1g 1:1.2.8.dfsg-5
Versions of packages atop recommends:
ii cron [cron-daemon] 3.0pl1-128+deb9u1
atop suggests no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: atop
Source-Version: 2.7.1-2
Done: Marc Haber <[email protected]>
We believe that the bug you reported is fixed in the latest version of
atop, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Marc Haber <[email protected]> (supplier of updated atop package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Format: 1.8
Date: Wed, 13 Jul 2022 12:15:08 +0200
Source: atop
Architecture: source
Version: 2.7.1-2
Distribution: unstable
Urgency: medium
Maintainer: Marc Haber <[email protected]>
Changed-By: Marc Haber <[email protected]>
Closes: 896767
Changes:
atop (2.7.1-2) unstable; urgency=medium
.
[ Marc Haber ]
* we of course need to conflict with acct
* remove -R from default command line
upstream has done the same, we're following
Thanks to Manuel Arostegui (Closes: #896767)
* fix syntax issue in autopkgtest, add debug output
* add patch description to atop-rotate-systemctl-path
* Standards-Version: 4.6.1 (no changes necessary)
* use https in debian/watch
* patch some manual page typos flagged by lintian
* enable all hardening in debian/rules
* override some lintian warnings
.
[ Debian Janitor ]
* Remove constraints unnecessary since buster
* atop: Drop versioned constraint on lsb-base in Depends.
Changes-By: deb-scrub-obsolete
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