Questions tagged [dmesg]
The dmesg tag has no usage guidance.
-1
votes
1answer
66 views
Why is clearing the console the default behavior of Linux today? [closed]
Why doesn't the boot messages persist in the terminal after booting, on modern Linux distributions?
Yes, I know I can make the boot messages persist with --noclear or TTYVTDisallocate=no.
Like ...
1
vote
1answer
64 views
“kernel: Buffer I/O error on device” - Does my server have a hardware problem?
we have linux DB server redhat 7.2
we notice about many message as below about all disks that are mounted
from /var/log/messages
what we are need to understand if this behavior is relevant to HW ...
2
votes
2answers
44 views
SSD's hard resetting link CentOS 7
I have two Intel SSDSC2CW120A3 SSDs in a SuperMicro X9SCL/X9SCM set for software RAID-1 on CentOS 7:
Linux hostname.local 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 ...
2
votes
2answers
100 views
why MTU change from 1500 to 9000
in /var/log/message file we found something interesting
Mar 9 07:08:32 linux54 kernel: ixgbe 0000:0b:00.1 en3j87: changing MTU from 1500 to 9000
we can see the interface card - en3j87
change from ...
-1
votes
1answer
100 views
dmesg gave errors blk_update_request: I/O error, dev xxx, sector xxxxxxxxxx
I'm newbie for linux system.
founded errors by performing dmesg, seems like there're something wrong with all of disks. I keep tracking the errors until now. Here're a log from dmesg.
[Wed Mar 13 17:...
0
votes
0answers
48 views
dmesg + why somethings link is up and link is down from dmesg
from the dmesg we get something interesting
some time we see
[ 41.174357] IPv6: ADDRCONF(NETDEV_UP): eth2f0: link is not ready
and sometimes we see
[ 41.874332] IPv6: ADDRCONF(NETDEV_CHANGE):...
0
votes
1answer
152 views
Writing to /dev/kmsg randomly shows up in /proc/kmsg and always in dmesg?
When writing a message to /dev/kmsg while tailing /proc/kmsg the messages show up very randomly, in never shows up in /var/log/kern.log.
However, dmesg gets all the messages correctly.
Example
# ...
0
votes
1answer
93 views
Understanding a dmesg kernel warning message
I am trying to debug my kernel module.
When I run it I get the following kernel warnings, but it seems that there is no informative message like other warnings I've seen. Is it possible to get any ...
1
vote
1answer
55 views
No root permission in a docker container image
I test a Docker container (created from Nvidia CUDA image) started with the command:
docker run -i -t xxxxxx /bin/bash
I can see the root prompt, but still don't have privileges for some operations; ...
0
votes
1answer
50 views
NVIDIA usable memory 4GB instead of 6GB?
I have an NVIDIA 1060 with 6GB of memory in my laptop.
I am on Linux Mint 19.1 Cinnamon 64-bit with NVIDIA drivers version 390 official:
You can see for yourself, but I know that from Dell support, ...
0
votes
2answers
65 views
How can I configure a running kernel to output dmesg info directly to the tty, without involving any userspace programs?
There are a large variety of questions floating around the 'net from people who want to watch the output of dmesg in real time. All the suggestions and answers involve using dmesg -w, tail, journalctl ...
1
vote
0answers
71 views
Difficult tainted kernel message - anyone know the source?
It lists so many things that I can not tell the source. I see iee80211 so I thought it might be a network packet, but than I see IRQ and also modules being listed so it is really convulated.
Ubuntu ...
0
votes
1answer
50 views
how to understand the dmesg
we have redhat machine version 7.2 and each machine have disks
as
sdb
sdc
sdd
sde
sdf
in the dmesg report we get the following
[873080.996700] Buffer I/O error on device sdf, logical block ...
0
votes
1answer
81 views
Docker container is killed during performance tests
I need to understand why docker container is being killed during processing.
Short background:
we're running performance tests in RH machine. (Machine has 64GB RAM, 16 CPU) after 20 hours of run or ...
1
vote
0answers
53 views
2 LAN cables connected, 1 PCI bus and vice versa
When booting my pc with 2 LAN cables connected only one interface is registered.
03:00.0 and 04:00.0
$ dmesg | grep -P '0(3|4):00.0'
[ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class ...
0
votes
0answers
67 views
dmesg + Reset adapter - what is mean - is it problem
from the dmesg we get the following note -
e1000 0000:02:01.0 eth12983746: Reset adapter
is it mean that we have problem with eth card ? and because that adapter is restart ?
[440924.709103] <...
0
votes
1answer
107 views
Which kernel .config option causes “Magic number: 1:252:3141” on dmesg?
Here it is in context:
[ 0.507474] i8042: PNP: No PS/2 controller found.
[ 0.507568] mousedev: PS/2 mouse device common for all mice
[ 0.507683] device-mapper: uevent: version 1.0.3
[ 0....
-1
votes
0answers
166 views
Kernel messages in messages log have wrong timestamp. How can I correct CLOCK_MONOTONIC drift without rebooting?
We have a bunch of linux nodes out in the field running a 2.6 kernel.
hostname:~# uname -a
Linux hostname 2.6.23.1 #1262 Fri Nov 29 07:11:22 EST 2013 armv5teb GNU/Linux
Most of them have an uptime ...
1
vote
0answers
64 views
Linux kernel networking Ubuntu debug message not shown with printk/pr_debug?
I have recompiled the Linux kernel on Ubuntu and now upgraded to 4.17.6. I need to modify the TCP/IP stack parts, in specific one of the congestion control algorithms (eg. Vegas). After successful ...
0
votes
0answers
180 views
busybox dmesg old timestamp format
I'm working on an arm board running an old kernel(3.14.29)
I trying to to get the dmesg output and pass it to the bootgraph.pl to generate an SVG of kernel boot sequence.
However after passing the ...
0
votes
1answer
394 views
How to read usb-storage message in dmesg?
When inserting a USB pen drive, I get the following message
[20236.720694] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[20236.721212] scsi host6: usb-storage 1-1.2:1.0
I think usb-...
1
vote
0answers
525 views
how to know why Linux redhat machine performed reboot
we have cluster with redhat machines version 7.2
on pluto05 machine we saw that machine rebooted before one day
uptime
13:51:06 up 1 day, 1:46, 2 users, load average: 0.30, 0.14, 0.08
and from ...
1
vote
0answers
68 views
What are the possible cause of “__rtc_set_alarm: err=-22” error message in dmesg?
What are the possible cause of "__rtc_set_alarm: err=-22" error message in dmesg? I am seeing this in my log files but I do not try to set the alarm or schedule it anywhere.
0
votes
1answer
419 views
Understanding dmesg warning
Could anyone give some insight on what these warnings mean in the below dmesg log? Do they mean that the atl1c module is failing to load completely or merely a warning?
Any information that helps ...
1
vote
2answers
137 views
Unusal boot time of one hour, where to find logs [closed]
I have an unusual time of boot of aprox one hour on a RPI.
After one minute I can ping the device, but I can't do an ssh after until 1 hour. I don't know where to find logs to hep me. I checked /var/...
1
vote
0answers
1k views
How to get DisplayLink to work with Debian?
I have have successfully installed the necessary drivers as outlined: https://github.com/AdnanHodzic/displaylink-debian/blob/master/post-install-guide.md
I do have UEFI installed on Intel NUC (...
2
votes
1answer
950 views
Toggling visibility of segmentation fault messsages in dmesg
When applications segfault, I generally see messages like this in dmesg:
pstree[25678]: segfault at 0 ip 00007f58be0b3ae4 sp 00007ffe65b700a0 error 4 in libc-2.24.so[7f58be04d000+195000]
However, I ...
0
votes
4answers
9k views
Log iptables events on centos 7
I have got iptables on my centos 7. My firewalld is disabled.
How can I log my iptables events? On debian it is dmesg option but I don't know how to set it on centos.
I want to log all of my iptables ...
0
votes
1answer
751 views
Is it possible to tell when /dev/kmsg has been ratelimited?
The Linux kernel developers decided by default to ratelimit messages to /dev/kmsg. This was because they did not like the amount of messages written by systemd, particularly when debug is passed on ...
2
votes
0answers
201 views
alloc_contig_range test_pages_isolated failed
On an embedded linux system (arm cortex a9 imx.6), the hmi program froze at a certain time. At the same time there was the following log in /var/log/messages es well with "dmesg":
alloc_contig_range ...
2
votes
1answer
374 views
What are 'dmesg' failure messages?
When I'm executing the dmesg command on my RHEL 7.4 server, I'm noticing following failure messages:
[root@localhost ~]# dmesg | grep -i fail
[ 0.984930] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND)...
2
votes
0answers
115 views
Very long ubuntu startup time
I've just installed Ubuntu (on an SSD) and startup takes over two minutes. I've checked "dmesg" and found a clear 90 seconds process that probably shouldn't be there.
[ 13.831788] audit: type=1400 ...
0
votes
1answer
2k views
How to increase dmesg buffer size in CentOs 7.2?
I am getting following message in dmesg:
"systemd-journald[414]: /dev/kmsg buffer overrun, some messages lost."
How to increase dmesg log buffer size to view all debug messages?
Any help will be ...
0
votes
1answer
699 views
Parrotsec OS unable to run apt-get and got some errors with dmesg
I install parrot OS and when installing a package i found this error. It is the the same when I try to install any package.
Reading package lists... Error!
W: Not using locking for read ...
3
votes
0answers
196 views
sda:sda1 keeps showing up in dmesg
dmesg logs is 'filled with' the following :
[613051.997981] sdf: sdf1
[613052.068773] sdf: sdf1
[613352.060804] sdc: sdc1
[613653.176468] sdc: sdc1
This just continues on and on about every 300 ...
-1
votes
1answer
85 views
how to identify if raid1 or raid mirror configure on OS disk
we want to verify if raid1 is configured on out linux machine
so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1
but from the output - ...
0
votes
0answers
999 views
What to do if I get this error: `mce: [Hardware Error]: PROCESSOR 0:306c3 TIME 1511138090 SOCKET 0 APIC 0 microcode 22`?
I have an Intel i7 laptop. While running two VirtualBox VMs and while training a neural network with TensorFlow, my KDE desktop told me with a popup that I got the following message:
Message from ...
1
vote
1answer
425 views
Can I restrict dmesg to a group?
I understand that, for security reasons (like address randomization), it makes some sense to not let every user be able to read the kernel's dmesg. Linux allows one to restrict dmesg to the root user ...
0
votes
2answers
779 views
dmesg with / without sudo on Debian / Mint
I noticed this difference some time ago, but until now, I didn't bother to ask, why is that?
On Linux Mint 18 (Ubuntu-based) I can run dmesg without using sudo.
On GNU/Linux Debian 9 I must use sudo ...
1
vote
0answers
1k views
Trying to fix these dmesg errors Debian Stretch
Since updating to Debian Stretch I'm seeing these kernel messages while system boots up (in prior version's they did not show up at all): dmesg -k -l err,warn
[ 0.008642] ENERGY_PERF_BIAS: Set to '...
3
votes
2answers
167 views
HGST 6TB Drive not recognized
I have a HP Proliant Microserver Gen8 running Debian Stretch. I installed a HGST 6TB HDD in Slot 1 and when I boot the device does not show.
dmesg
output:
[ 8.159512] ata1: SATA link up 6.0 Gbps (...
0
votes
1answer
299 views
Buffer I/O error on /dev/sda2, running fsck.hfsplus returns OK
At the moment, I'm mounting a USB hard drive running HFS+ on a Raspberry Pi 3 at boot to be writable. Not 100% sure what I did, but the drive is suddenly throwing up errors such as Buffer I/O error on ...
0
votes
1answer
73 views
Storing Huge Data in Linux Kernel
I have a customized Linux Kernel which prints to dmesg and syslog (using printk) some additional information about each received MP-TCP packet in the system. Things work perfectly, however I am ...
12
votes
1answer
9k views
dmesg: read kernel buffer failed: Permission denied
Since recently Debian has changed the default behavior for dmesg and I cannot use it simply from my local user.
% dmesg
dmesg: read kernel buffer failed: Operation not permitted
Same goes for:
% ...
3
votes
1answer
5k views
How to filter the dmesg log to see only the errors
I am in ubuntu, when I write dmesg the error messages appear in red, how could I print in the console only those?
0
votes
1answer
224 views
How to get segfault information for my processes without root permissions?
Debian no longer exposes dmesg to users. It contains useful history about crashes. For example:
segfault at [...] error 4 in libHSrts_thr-ghc8.0.2.so[7f00f2b6b000+63000]
How can I get this ...
9
votes
2answers
10k views
Understanding “serial8250: too much work for irq4” kernel message
dmesg shows lots of messages from serial8250:
$ dmesg | grep -i serial
[ 0.884481] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
[ 6.584431] systemd[1]: Created slice system-serial\...
7
votes
1answer
2k views
What is the first column in dmesg?
I'm trying the dmesg command which outputs the message buffer of the kernal. The format returned on my setup is in the format:
...
[ 0.000000] 3 base 100000000 mask F00000000 write-back
...
[ ...
2
votes
1answer
3k views
USB drive is not recognized
I have a Transcend USB drive that is not recognized by the system (Debian Jessie 3.16-amd64). Let me explain:
When I connect it to the PC (Gnome) it makes the typical sound of when a drive is ...
7
votes
1answer
3k views
What is the difference between dmesg and journalctl [closed]
I am completely new in Linux. What I see are two logs that run approximately in the same way. Why there are two logs? What kind of messages I expect to see in each of them? And what is the difference ...
