Questions tagged [dmesg]

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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 ...
King David's user avatar
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 ...
King David's user avatar
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1 answer
318 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 ...
King David's user avatar
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146 views

What does this disk message in dmesg means?

[Mon Jan 30 19:43:19 2023] ata4: COMRESET failed (errno=-16) [Mon Jan 30 19:43:19 2023] ata4: hard resetting link [Mon Jan 30 19:43:06 2023] ata4: link is slow to respond, please be patient (ready=0) [...
Sangria's user avatar
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0 answers
96 views

Cannot mount EBS made using another EC2 instance

I previously made an Amazon EC2 instance and stored some data onto an elastic block storage volume (150 GB sc1). I have since detached the volume and attached it onto another EC2 instance. However, ...
drowinginerrors101's user avatar
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 ...
ZioByte's user avatar
  • 296
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1 answer
577 views

Dmesg to real timestamp

I would like convert my Centos 6.10 dmesg in real timestamp, how do I do this? I tried with -T but no luck. I have long entry like (1630230907.320:2)
Neha Patil's user avatar
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1 answer
225 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 ...
Tao Lei's user avatar
6 votes
1 answer
595 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 ...
Hussain Nagri's user avatar
1 vote
0 answers
692 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 ...
Uberhumus's user avatar
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2 answers
467 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 ...
Lucio Crusca's user avatar
0 votes
2 answers
217 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, ...
Brydon Gibson's user avatar
1 vote
0 answers
150 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 ...
King David's user avatar
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79 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 ...
sheffadmin's user avatar
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1 answer
92 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 ...
Daniel Bandeira's user avatar
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-...
King David's user avatar
0 votes
1 answer
169 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 ...
dgreene's user avatar
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709 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 ...
shalom's user avatar
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1 vote
0 answers
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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 ...
shalom's user avatar
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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 ...
krdx's user avatar
  • 171
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 ...
shalom's user avatar
  • 461
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1 answer
244 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-...
Scott's user avatar
  • 163
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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 ...
MarkHelms's user avatar
  • 181
1 vote
0 answers
253 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 ...
Alireza's user avatar
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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 ...
Gee.Fu's user avatar
  • 31
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1 answer
127 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 ...
Kheshav Sewnundun's user avatar
-1 votes
2 answers
2k 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 ...
yael's user avatar
  • 43
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 ...
David Corley's user avatar
7 votes
1 answer
14k 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 ...
030's user avatar
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0 votes
0 answers
361 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 ...
stevejb's user avatar
  • 101
1 vote
0 answers
214 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. ...
user319514's user avatar
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 ...
user319514's user avatar
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 ...
Edd Barrett's user avatar
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 ...
Frank Barcenas's user avatar
1 vote
2 answers
846 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 ( ...
Hudsik's user avatar
  • 11
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 ...
user268083's user avatar
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 ...
user268083's user avatar
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 ...
Nick's user avatar
  • 826
-1 votes
1 answer
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 ...
Ludwig's user avatar
  • 1
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(...
drsect0r's user avatar
20 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 ...
g00gle's user avatar
  • 343
0 votes
2 answers
934 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 ...
Adam Ryczkowski's user avatar
4 votes
1 answer
623 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 ...
sune's user avatar
  • 51
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 ...
grigio's user avatar
  • 31
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 ...
petru's user avatar
  • 113
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 ...
Alexander Gladysh's user avatar
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 ...
Spacedust's user avatar
  • 568
17 votes
5 answers
88k 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 ...
Soviero's user avatar
  • 4,366
2 votes
2 answers
213 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....
EhevuTov's user avatar
  • 474
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?
edotan's user avatar
  • 1,876