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Questions tagged [dmesg]

37 questions
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What is Logger Buffer Sizes Of Developer Option

What is the Logger Buffer Sizes option of developer options? We have various options like: Off 64 K 256 K 1 M 4 M 16 M If we are changing the buffer size, do we have any impact in the buffer size of logcat and dmesg utilities. What will be the…
MUHAMMED RAFEEQ KARAKKADAN
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ubuntu kernel is hanging up upon OOPS without showing stack trace in dmesg or /var/log/kern.log

I have a sample driver with intentional null pointer access. When I load driver, my ubunut 18.04 with 4.15.0-55-generic kernel is not showing up any stack trace in dmesg or dmesg -w or in /var/log/kern.log file. I have other Ubuntu system with the…
Vijay Kalyanam
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Is it possible to find the process causing a traps msg in dmesg?

I am trying to troubleshoot a message that floods dmesg: [Tue Mar 5 20:46:23 2019] traps: g16[7254] trap invalid opcode ip:404956 sp:7fff6d7c6200 error:0 in g16[400000+4cf7000] [Tue Mar 5 20:46:24 2019] traps: g16[7356] trap invalid opcode…
j4nd3r53n
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version magic mismatch error for USB Wifi adapter

My Realtek USB Wifi adapter used to work fine till a few weeks ago. Today I wanted to try it out but as soon as I plug it in I was getting errors in syslog and dmesg for mismatch on the version magic. Here are the errors from…
maddog2323
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Linux Kernel module: printk message not where I expect to be in the buffer log

This question relates to a lab/homework assignment. We are asked to learn how to load and remove a kernel module, and then modify the C code in a kernel module that has been provided. We must define a struct that contains some elements to be…
Patch85
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Difference in time stamps between /proc/uptime and dmesg

Today I noticed an issue with the timestamps in my Linux box running redhat 7.3. The timestamp as shown in dmesg is behind of the one shown in /proc/uptime # echo TEST > /dev/kmsg && dmesg | tail -1 && cat /proc/uptime [661503.956980] TEST …
PHINCY L PIOUS
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Kernel module load causes bug

i am new with kernel modules development and have decided to write my first kernel module today. my module is supposed to receive 2 numbers as input, seperated by a whitespace and have those numbers added together. the kernel module communicates via…
Oryan Perlmutter
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