Questions tagged [dmesg]
The dmesg tag has no usage guidance.
50
questions
0
votes
0answers
23 views
dmesg -T + how to expand dmesg info in order to verify history details
we have rhel 7.2 server
from dmesg -T we see only the current date - Mon Jan 11
and not history dates as jan 10 , or less then jan 10
dmesg -T
[Mon Jan 11 12:02:53 2021] Initializing cgroup subsys ...
0
votes
0answers
45 views
rsyslog: How to get imuxsock to read kernel messages?
Does anyone have any idea how to get imuxsock to read kernel messages?
We have been having trouble getting any rule in an imuxsock ruleset to read kernel messages, in particular those from iptables. ...
0
votes
1answer
47 views
cat an file programs fail to acess a file but vi works properly (Debian)
I have getting some problems with my system after a bad reset via ctrl+alt+del. Since then errors related to ACPI and ata6 are reported. Trying to get a solution to this (in a savage way:I am n00b), I ...
0
votes
1answer
1k views
how to verify status of TCP Segmentation Offloading
we do the following on linux rhel machines
ethtool -K ifcfg-478476 tso off
now lets say that we want to verify the settings
how to do the check with ethtool or other cli?
we try
ethtool -k ifcfg-...
0
votes
1answer
71 views
How can I set the default time format for dmesg?
I use dmesg in Ubuntu heavily. I like the iso time format but I hate typing it out every time, so I use something like this in my .bashrc to set the default time format for dmesg:
# Setup alias for ...
0
votes
0answers
375 views
redhat + Filesystem error recorded from previous + mount: IO failure
we install new physical machine with 10 disks ( except the OS disk )
each disk is actuality hold HDFS file system
after we installed the Linux machine with hadoop kit
we start the datanode and we ...
1
vote
0answers
366 views
how to identify kernel problems from message log file
dear friends and colleges
we notice about unexpected freezed of one of our critical linux machines server linux - version - 7.2
this is VM machines
and now I am working to understand what the root ...
3
votes
2answers
4k views
Prevent kernel messages from appearing in dmesg
Is it possible to prevent kernel messages from appearing in dmesg output?
E.g. I am running software that terminates PPPoE tunnels. One of the features it provides is the ability to set custom ...
0
votes
2answers
693 views
linux redhat + how to resolve the issue about Invalid response packet from host
we have thousand of the following message in /var/log/messages
we also have strange issue that machine restart each of couple dayes
what need to do in order to avoid these messages?
Apr 25 00:08:31 ...
0
votes
1answer
176 views
dmesg errors not showing in ddrescue
We had a disk in a raid go bad and we are suspicious another one might have minor errors. So to be safe we are trying to recover both disks using ddrescue. The various help pages recommend a two-to-...
0
votes
1answer
3k views
Meaning of “GHES: HEST is not enabled!” in dmesg
After reboot of a SuSE 12 host I looked into dmesg and came across the info
GHES: HEST is not enabled!
GHES obviously means "APEI Generic Hardware Error Source support".
Should GHES/HEST be ...
1
vote
0answers
125 views
How should I disable application logs into syslog? [duplicate]
I have many services that floods syslog file in /var/log with tons of messages. Sometime server restart all of a sudden and when I created a ticket about the issue, they said that the problem is ...
2
votes
0answers
1k views
how to find which memory stick error
There is a Inspur SA5212SC server involve memory error. In dmesg output I got some error:
{16}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1
{16}[Hardware Error]: APEI ...
0
votes
1answer
123 views
TCPv6 RST sent | drivers/common/payload2/tb_tcpv6_conn.c:246
Am having a strange issue with my AWS Linux Box, since some time am having some up dans down with the sites am hosting.
Randomly for a few mins, the sites are unavailable.
In the dmesg log I find ...
-1
votes
2answers
930 views
Linux + how to know why Linux machine is hung from the messages on the console
As in the picture below, my Linux machine was hung and I couldn't login.
How do I identify the reason for the "hang", according to the messages on the console?
I searched /var/log/messages for more ...
3
votes
1answer
711 views
High load average, but low CPU/IO figures - how to diagnose? (dmesg output included)
We have a Hadoop cluster where arbitrary data nodes will lock up. This is usually pre-ceded by ever-increasing load averages, with CPU and IOwait remaining practically non-existant. The use case for ...
5
votes
1answer
7k views
Running dmesg on Docker results in “dmesg: read kernel buffer failed: Permission denied”
In order to debug why this issue occurs the following command is run on a container:
docker run -it <dockerImageName> dmesg
results in:
dmesg: read kernel buffer failed: Permission denied
...
0
votes
0answers
267 views
Is my disk gone?
My linux workstation just recently crashed. It now boots into a login screen and from there, if I log in, it logs me back out. Also, the resolution is much lower than it used to be. I think that it ...
1
vote
0answers
143 views
server large jiffies during boot(Calibrating delay loop…)
The server behaves abnormal, I checked the dmesg log , found the jiffies is very large during boot, between Detected cpu and Calibrating delay loop..
reboot the server does not solve the problem. ...
1
vote
0answers
710 views
wired dmesg output and high cpu load
I have like 50 Linux servers with the same hardware and kernel,
but recently found that some of them suffers from high CPU load, runs very slowly, top and ps show TIME column with impossible large ...
16
votes
1answer
20k views
How to disable perf subsystem in Linux kernel?
I'm running some benchmarks. My benchmark runner monitors the dmesg buffer between experiments, looking for anything which could impact performance. Today it threw this up:
[2015-08-17 10:20:14 ...
1
vote
1answer
3k views
Radeon DVI errors filling logs
These error just fill my logs:
[316094.848311] [drm:radeon_dvi_detect] *ERROR* DVI-I-1: probed a monitor but no|invalid EDID
[316104.895726] [drm:drm_edid_block_valid] *ERROR* EDID checksum is ...
0
votes
1answer
631 views
Wrong date/time in dmesg
we have this strange issue. We use perl script for human-readable time-stamp in dmesg (taken from http://linuxaria.com/article/how-to-make-dmesg-timestamp-human-readable) and I also tried this one ( ...
3
votes
1answer
8k views
“echo 0 > /proc/sys/kernel/hung_task_timeout_secs” disables this message
One of my server (Ubuntu 12.04, 16CPU, 32GB RAM) runs the app section of my website (Nginx 1.1.19, PHP5-FPM, Php 5.3.10, Symfony2 Web Framework)
Suddenly, users started getting HTTP 5** Errors. When ...
2
votes
1answer
1k views
php5-fpm invoked oom-killer
One of my server (Ubuntu 12.04, 16CPU, 32GB RAM) runs the app section of my website (Nginx 1.1.19, PHP5-FPM, Php 5.3.10, Symfony2 Web Framework)
Suddenly, users started getting HTTP 5** Errors. When ...
4
votes
1answer
3k views
kernel:EDAC MC0 spam in dmesg
I have spam in dmesg containing:
kernel:EDAC MC0: UE page 0x0, offset 0x0, grain 1073741824, row 3, labels ":": i3200 UE
Any idea what suppose to be wrong?
here are loaded modules:
# lsmod | grep ...
-1
votes
1answer
2k views
Nginx Reverse Proxy Segfault on High Traffic
Recently my load balancer with Nginx rev proxy showing the following error messages on /var/log/dmesg:
[6278902.558300] nginx[15683]: segfault at ffffffffffffffff ip 0000000000457b99 sp ...
3
votes
2answers
2k views
I/O Errors but no smart or ZFS errors
I'm having trouble to identify a problem for a friend of my. He is running ZFS on Linux with the Debian distribution. We are getting these entries into the dmesg.
[273044.834151] mpt2sas0: log_info(...
16
votes
3answers
13k views
dmesg time vs system time time isn't correct
I hope that here is somebody that can help me with this strange problem.
I think that i know why it is happening but i don't know how to solve it. Maybe it is because the BIOS time isn't set correct ...
0
votes
2answers
774 views
How to find out previous start-up time, so one can read `/var/log/dmesg.0` log?
That should be a quick one:
I'm running a small server, and one day discovered, that one of the LXC containers inside is down. I started it again, but I want to find out, for how long it was down.
I ...
4
votes
1answer
588 views
Same hard drive problems in dmesg on several servers
We have a couple of these SuperMicro MicroCloud units.
In total we've got 16 servers (2x8) which all randomly spew these messages in dmesg:
[4661350.802707] ata2.00: failed command: WRITE FPDMA ...
-2
votes
1answer
7k views
SMART and exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 [closed]
looking at the logs I see several errors. The smart status is PASSED, but even if It is verbose It isn't clear what is going on. Should the disk be replaced?
Attached dmesg and smart logs
# dmesg
...
1
vote
1answer
3k views
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size
I have a problem with the following error appearing upon sending a dmesg command to my server:
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
How do I increase ...
3
votes
2answers
3k views
nf_conntrack complaints in dmesg
While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server:
[11458852.811070] net_ratelimit: 321 ...
0
votes
2answers
2k views
Ext4 self errors after some time on CentOS 5.8 64-bit
I get such warnings in dmesg:
EXT4-fs error (device md2): mb_free_blocks: double-free of inode 0's block 602619328(bit 15808 in group
EXT4-fs error (device md2): mb_free_blocks: double-free of inode ...
14
votes
5answers
76k views
What do these disk errors in syslog mean?
I just rebooted my monitoring server for the first time in a while, and the following starting filling the screen:
Jul 11 23:52:30 monit kernel: [ 25.255908] ata1.00: exception Emask 0x0 SAct 0x0 ...
2
votes
2answers
184 views
How do I find out my CD ROM hardware specifics on FreeBSD?
I can usually use dmesg soon after bootup to display hardware info that my kernel loads. After my system has been up for a while however, dmesg no longer produces anything of value concerning hardware....
15
votes
6answers
36k views
Linux Centos with dmesg timestamp
I would like to read my Centos 5.x dmesg with timestamp, how do I do this?
49
votes
6answers
77k views
How to convert 'dmesg' time format to 'real' time format
I have (for example) this log entry in dmesg output:
[600711.395348] do_trap: 6 callbacks suppressed
Is there a possibility to convert this 'dmesg' time to 'real' time to know, when this event ...
1
vote
1answer
2k views
APIC error on CPU1: 60(60) in dmesg what does it mean?
APIC error on CPU1: 60(60) in my dmesg log. What does it mean? Should I be worried! Is this some hardware issue?
5
votes
5answers
36k views
Linux - martian source in /var/log/messages
I keep getting these messages in /var/log/messages :
Mar 8 23:17:25 saas1 kernel: martian source 169.254.1.1 from 169.254.95.118, on dev usb0
Mar 8 23:17:25 saas1 kernel: ll header: ff:ff:ff:ff:ff:...
1
vote
2answers
2k views
Does this dmesg output indicate a failed network card on Red Hat Enterprise?
Having an issue with a network card on a server today. If I restart the service via "service network restart" the card never comes back, the command prompt just hangs. I suspect it's a bad network ...
1
vote
1answer
2k views
why dmesg | grep Memory gives two different physical memory amounts?
I am monitoring physical memory in a server I administer, and my hardware provider told me they had increased physical memory size to 4Gb...
However, using several tools (free -m; top; dmesg | grep ...
2
votes
2answers
856 views
Dmesg and cpuinfo MHz differencies
I can see different values of CPU MHz here:
cat /proc/cpuinfo
model name : Intel(R) Xeon(R) CPU
E3110 @ 3.00GHz stepping : 6
cpu MHz : 2000.000
Model say 3GHz and cpu MHz ...
49
votes
7answers
67k views
How to add message that will be read with dmesg?
I am trying to write some custom messages in my dmesg output. I tried:
logger "Hello"
but this does not work. It exits without error, but no "Hello" appears int the output of:
dmesg
I am using a ...
3
votes
4answers
2k views
Is segfault signal always sent to application
My application usually crashes and prints stack to log if received segfault signal.
But in some environment the 'dmesg' shows segfault messages related to my application, but application uptime is ...
3
votes
2answers
4k views
dmesg SYN flood on 80 sysctl -p
I am getting a synflood on my server port 80 and i cannot stop it.
first i got tables full then i disabled iptables to find out that its a synflood
netstat -n | grep :80 |wc -l
#returns 1300 - 2000
...
4
votes
4answers
5k views
Explain the output of dmesg
I am running a Debian system, and find the output of the dmesg command very helpful.
Can somebody explain to me what information is output by the dmesg command? Is it a 1:1 correlation to the kern.* ...
2
votes
6answers
11k views
Monitoring dmesg output
I find that when something goes wrong at a low level on one of my linux servers, I can see messages about it in the kernel ring buffer. These can be viewed from the command line using the dmesg ...
2
votes
3answers
4k views
What are these strange entries in dmesg?
Running Ubuntu Linux 9.04, and I see these odd log lines in dmesg:
[ 18.673752] type=1505 audit(1240159967.221:2): operation="profile_load" name="/usr/share/gdm/guest-session/Xsession" name2="default"...
