Questions tagged [dmesg]

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"Invalid system disk" after "There are differences between boot sector and its backup"

I created a live LMDE5 system on a USB pen drive using Rufus and everything was working fine except for a large number of warnings and critical error messages I got from dmesg. There where some ...
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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 ...
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2 answers
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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 ...
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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, ...
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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 ...
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Cpu utilization and Cpu load average very high in spite all applications are shutdown

we have a RHEL 7.6 VM machine , server with 16 GIGA RAM and 8 CPU's we notices that CPU utilization is high on this server , and also the CPU load average load average is around - 50 - 60 , and the ...
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236 views

curlftpfs on proxmox " Input/output error"

I use curlftpfs to mount my ftp hosted by scallway on a dedibox (proxmox 6.4-7). curlftpfs dedibackup-dc3.online.net /mnt/ftp-backup -o rw,allow_root,nonempty,direct_io,hard_remove,big_writes,dev,suid ...
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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 ...
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1 answer
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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 ...
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1 answer
2k 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-...
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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 ...
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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 ...
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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 ...
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2 answers
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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 ...
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2 answers
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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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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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-1 votes
2 answers
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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 ...
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3 votes
1 answer
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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 ...
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7 votes
1 answer
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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 ...
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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 ...
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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. ...
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1 vote
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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 ...
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16 votes
1 answer
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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 ...
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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 ...
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0 votes
2 answers
727 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 ( ...
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3 votes
1 answer
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"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 ...
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2 votes
1 answer
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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 ...
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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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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 ...
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3 votes
2 answers
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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(...
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18 votes
4 answers
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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 ...
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2 answers
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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 ...
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4 votes
1 answer
603 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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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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 ...
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2 answers
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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 ...
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16 votes
5 answers
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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 ...
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2 votes
2 answers
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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....
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15 votes
6 answers
38k views

Linux Centos with dmesg timestamp

I would like to read my Centos 5.x dmesg with timestamp, how do I do this?
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53 votes
6 answers
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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 ...
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1 answer
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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?
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6 votes
5 answers
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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:...
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2 answers
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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 ...
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1 vote
1 answer
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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 ...
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2 votes
2 answers
886 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 ...
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