Questions tagged [dmesg]
The dmesg tag has no usage guidance.
63
questions
61
votes
7
answers
111k
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 ...
- 2,180
52
votes
7
answers
79k
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 ...
- 1,295
21
votes
4
answers
18k
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 ...
- 353
17
votes
5
answers
89k
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 ...
- 4,366
17
votes
1
answer
24k
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 ...
- 973
15
votes
6
answers
40k
views
Linux Centos with dmesg timestamp
I would like to read my Centos 5.x dmesg with timestamp, how do I do this?
- 1,906
7
votes
5
answers
42k
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:...
- 199
7
votes
1
answer
15k
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
...
- 5,971
6
votes
1
answer
609
views
How does dmesg differentiate between different log levels?
How does dmesg differentiate between different log levels?
I can execute dmesg -l err to see all the error logs but when I look at the data with just dmesg or just cat the /var/log/dmesg file, there ...
- 211
4
votes
4
answers
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.* ...
- 23k
4
votes
1
answer
4k
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 ...
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4
votes
1
answer
628
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 ...
- 51
4
votes
2
answers
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
...
Daniel
4
votes
1
answer
16k
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 ...
- 61
3
votes
2
answers
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 ...
- 2,443
3
votes
4
answers
3k
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 ...
- 248
3
votes
2
answers
5k
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 ...
- 171
3
votes
1
answer
794
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 ...
- 183
3
votes
2
answers
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(...
- 31
3
votes
0
answers
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 ...
- 31
2
votes
2
answers
944
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 ...
- 149
2
votes
3
answers
5k
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"...
- 14.4k
2
votes
6
answers
12k
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 ...
- 23k
2
votes
2
answers
219
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....
- 474
2
votes
1
answer
2k
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 ...
- 61
1
vote
1
answer
5k
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-...
- 559
1
vote
1
answer
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 ...
- 377
1
vote
1
answer
48
views
RHEL + how to capture fresh kernel message without machine reboot
here is example from dmesg output from important production server ( RHEL 7.2 - DELL machine HW )
as we can see the sde disk in server is dying
[Wed Jun 30 11:24:58 2021] sd 0:2:4:0: [sde] tag#0 ...
- 559
1
vote
1
answer
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 ...
- 605
1
vote
2
answers
868
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 ( ...
- 11
1
vote
1
answer
2k
views
"Hardware Error" popping up in dmesg
I am sporadically (twice in over a month) seeing worrying errors like:
[757706.327447] mce: [Hardware Error]: Machine check events logged
[757706.327450] [Hardware Error]: Corrected error, no action ...
- 296
1
vote
1
answer
4k
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 ...
- 113
1
vote
1
answer
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?
- 5,248
1
vote
2
answers
3k
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 ...
- 1,039
1
vote
0
answers
785
views
Is there a way to read dmesg.old with absolute timestamps
Is there a way, using dmesg or otherwise to see the data in /var/log/dmesg.old with an absolute timestamp? I'm trying to get the same effect as dmesg -T but on older data.
I'm using Amazon Linux AMI ...
- 213
1
vote
0
answers
168
views
what are the kernel messages about "Disabling DIF Type 2 protection" means
On our RHEL 7.2 server we saw a strange kernel messages with lines as:
Disabling DIF Type 2 protection
***10DIGITS*** 512-byte logical blocks: (2.00 TB/1.81 TiB)
Above messages are relevant for all ...
- 559
1
vote
0
answers
770
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 ...
- 471
1
vote
0
answers
255
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 ...
- 603
1
vote
0
answers
227
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. ...
- 21
1
vote
0
answers
1k
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 ...
- 21
0
votes
1
answer
11k
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
...
- 31
0
votes
1
answer
110
views
kernel messages are complained about memory.inspite all DIMM cards was replaced
we have few DELL machines ( with RHEL 7.6) , and as we replaced the DIMM cards on machines because the Erros that we seen from kernel messages
after some time we checked again the kernel messages and ...
- 559
0
votes
1
answer
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 ...
- 181
0
votes
2
answers
3k
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 ...
- 568
0
votes
1
answer
268
views
dmesg tells 1G out of 128G available?
I have a 128GB RAM server, kernel 4.18.0-305.7.1.el8_4.x86_64,
"dmesg | grep Memory" outputs as follows:
[ 0.000000] Memory: 1282732K/133708404K available (12293K kernel code, 2225K ...
- 3
0
votes
2
answers
947
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 ...
- 730
0
votes
1
answer
453
views
kernel message + how to know if we need to replace the DIMM based on kernel messages
we have RHEL 7.6 server , and we noticed about the following kernel messages.
[1065085.048872] EDAC sbridge MC0: PROCESSOR 0:406f1 TIME 1676989040 SOCKET 0 APIC 0
[1065086.052107] EDAC MC1: 0 CE ...
- 559
0
votes
2
answers
497
views
What's the normal order of messages in dmesg when a USB HDD is failing?
I have a USB hard drive attached to a Debian GNU/Linux server. I'm trying to format it (NTFS), with this command:
# mkntfs -v /dev/sdd1
which takes a few hours, because it checks the disk too. While ...
- 432
0
votes
2
answers
256
views
What driver created this dmesg message?
Usually, dmesg entries are prepended by the name of the driver that is posting the message to the buffer. This makes it easy to track down where the error is coming from and how to fix it. In my case, ...
0
votes
2
answers
1k
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 ...
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