when the computer or an application is not responding

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171
votes
3answers
89k views

How to unfreeze after accidentally pressing Ctrl-S in a terminal?

It's a situation that has happened quite often to me: after I press (with a different intention) Ctrl-S in a terminal, the interaction (input or output) with it is frozen. It's probably a kind of ...
21
votes
4answers
37k views

How to completely disable swap?

I am using Debian sid, hard drive formatted with ext4, running on linux 3.1 I remember on previous linux versions (maybe before 3.0), if I run out of memory, and swap is not enabled, programs will ...
15
votes
3answers
476 views

How to force Linux kernel to “freeze” (or nearly freeze) for a few hundred milliseconds

We are running a real-time process on a non real-time kernel (CentOS 6), and this is probably not going to change. We have a streaming video application that requires about 500 MB/s of PCIe traffic ...
10
votes
3answers
10k views

Why is my PC freezing while I'm copying a file to a pendrive?

I have a really strange situation here. My PC works fine, at least in most cases, but there's one thing that I can't deal with. When I try to copy a file from my pendrive, everything is ok -- I got ...
9
votes
2answers
2k views

How to prevent fork bomb?

To prevent fork bomb I followed this http://www.linuxhowtos.org/Tips%20and%20Tricks/ulimit.htm ulimit -a reflects the new settings but when I run (as root in bash) :(){ :|:&};: the VM still goes ...
8
votes
1answer
1k views

How to debug system freeze?

I'm experiencing strange bug when I close lid of my laptop - system freezes (no reaction on keys, no response form ssh) hard and displays some strange colour effects. The kernel log (after reboot) ...
8
votes
1answer
3k views

System hanging when it runs out of memory

I've got an eeePC 900a: it has a 8GB flash as disk and only 1GB of RAM. The Linux distribution installed on it is ArchLinux. When the system runs out of memory it becomes extremely unresponsive: it ...
7
votes
4answers
2k views

Debugging Linux machine freezes

I have 15 identical Linux RH 4.7 64-bit severs. They run cluster database (cluster is application level). On occasion (every month or so) a random box (never the same though) freezes. I can ping the ...
7
votes
1answer
355 views

Where should I look for error messages after a freeze-up and reboot in Linux?

I was forced to shutdown (using the power button) and reboot after my laptop froze with just a black screen. After such an incident, where should I look for error messages etc. that might indicate ...
7
votes
1answer
3k views

Fedora 17 Freezes on Boot

I have been having issues with Fedora 17 not booting after the latest round of updates. I am able to enter the pass for my disk encryption, the boot logo acts normally but after the animation is ...
7
votes
1answer
376 views

Low battery freezes laptop [closed]

I have a laptop Lenovo G575. MS Windows works without any problems on it, but with Linux, it freezes during login or up to 10 minutes after power on. I have tried Ubuntu, Fedora 15 and 16, Fedora 16 ...
6
votes
2answers
910 views

System often freezes without warning

The system often just freezes up without any warning, it doesn't gradually start getting slower or something like that, and every time I look the avarage system load is below 20% (usually not even ...
6
votes
1answer
299 views

Untraceable stability problem of 3.6.8 kernel on ASUS P53E

Randomly, but not later than after 10 hours of work, the laptop freezes. Just freezes. Knowing that not all hardware errors are reported back to the user I tried the netconsole. Unfortunately the ...
5
votes
4answers
502 views

Accidental `nano SomeFile | uniq` renders the shell unresponsive

In my attempt to get unique entries (read lines) out of a simple text file, I accidentally executed nano SomeTextFile | uniq. This "instruction" renders the shell (bash) completely (?) ...
5
votes
1answer
297 views

How do I figure out what's freezing up my machine?

I am running Arch on this machine: 3.40GHz i7 hexacore (4930K) 16GB DDR3 1600MHz RAM 2xSamsung 840 EVO SSDs in Raid0 (using BTRFS raid) When I run VMware on my Arch with a few VMs (2 ...
5
votes
3answers
7k views

How to recover from desktop freeze without losing running windows?

Sometimes VirtualBox causes random freeze of my Mint 16 Cinnamon Desktop 64bit. I am not able to pinpoint what is actually wrong and even where to fill the bug report. But the life goes on and I ...
5
votes
1answer
244 views

Hard drive writes freezing up Gnome

I'm currently running Debian 6.0.5 on my white Macbook 2008 (4,1) and have recently noticed that when I download, move, or decompress a file, Gnome freezes up completely for at least 20 seconds. These ...
4
votes
3answers
527 views

Is there a way to discover why my server had a high load

Just now I was forced to remotely reboot my CentOS 6.3 system due to a ultra high load (75!) that paralyzed the system. This is a web/mail server that serves a wordpress blog (mySQL + PHP). Is there ...
4
votes
1answer
3k views

chrome freezes Ubuntu 13.04

Since about 2 to 3 weeks ago, my Ubuntu 13.04 desktop frequently freezes after I am using Chrome for a while. The mouse is movable, but nothing respond to mouse or keyboard. I have to push the power ...
4
votes
1answer
648 views

Vim high CPU usage upon opening JS files

Vim and especially Gvim stops responding and utilizes 100% of CPU upon opening big .js files (1000+ lines). Pressing Ctrlc stops the process. Whatever Vim does trying to open the file, it displays the ...
4
votes
1answer
431 views

How can I prevent disk I/O from taking over my CPU?

I run Debian Jessie on a quad-core i7 processor, which results in 8 cores being shown thanks to hyperthreading. On disk-heavy loads, all eight cores are maxed out with io-wait, as shown by htop. This ...
4
votes
1answer
2k views

System freezes. Can't find anything in the logs

My linux desktop system freezes (aptosid/debian sid) sometimes and after a reboot I can't find any infos about the reason for the freeze in messages/dmesg/syslog/Xorg.*.log. When it "freezes" I can ...
4
votes
1answer
2k views

How to quit GNOME file copy GUI after it hangs

Many times I find GNOME file copy GUI tool (Nautilus) irritating when it stops working. It happens when: I cancel the copy or move I try to copy to blue tooth exchange folder to my friends ...
4
votes
0answers
192 views

Why does music still loop, when my PC freezes? [closed]

Unfortunately it happens rather regularly, that some i/o job or some other activity clogs all the cpu power on my rather old linux machine and leaves me with a frozen desktop, where not even the mouse ...
4
votes
1answer
847 views

How to open tty or execute some script when the shortcut Ctrl+Alt+F[1-6] doesn't work and X11 is partially frozen but system is still working?

I'm using Ubuntu 10.10 with Gnome on Acer Aspire One netbook. The X11 or just some parts of Gnome like panels and partially windows (details described below) are frozen which doesn't allow to do ...
3
votes
3answers
2k views

Ubuntu 12.04 Gnome 3 “freezes” randomly - not a normal freeze though

Since upgrading to 12.04, I've randomly experienced this strange phenomenon where my mouse mostly doesn't work and keyboard mostly does. I have not been able to identify a cause for this. Sometimes it ...
3
votes
1answer
29 views

How to find out what caused lag/freeze and self-reboot?

Xubuntu 14.04 FF 39.0, packaged by Canonical I just experienced my machine practically freeze up and not reacting not any input. The mouse pointer moved like 2 mm every 20 seconds and my CPU load ...
3
votes
3answers
47 views

Cursor freezes - keystrokes to release?

Occasionally the mouse cursor will freeze - I have to reboot. In Ubuntu is there a keystroke combination such as Ctrl+Alt+Del which would enable me to continue working without having to reboot?
3
votes
1answer
433 views

Linux mint freezes on second account login - unable to handle kernel NULL pointer dereference at (null)

I have two accounts, daniel and dn. When I log in with daniel first, everything is okay. But I can't login with dn, it freezes. It's irrelevant if I log out daniel or try a parallel login. It's the ...
3
votes
1answer
506 views

Debian Jessie - Random freezes

I have a fresh installation of Debian Jessie, with Cinnamon and Gnome. I run it on a decent computer with the following specs: Athlon II x3, 6GB DDR2, 2GB SWAP (swapiness minimum), 600GB SATA HDD ...
3
votes
0answers
217 views

USB Mouse Freezing in Debian / KDE // Keyboard OK

Having problems with seemingly random freezes of my Logitech Wireless Mouse in Debian (KDE). With regards to a number of articles out there, I don't have powertop, mouseemu or laptop-mode-tools ...
3
votes
1answer
29 views

A ton of input at the login appears to lock the machine?

Occasionally my one year old son will come into my office where my machine is at the command line login prompt. As my little geekling is wont, he starts banging on the keyboard like Daddy does. As ...
3
votes
0answers
328 views

Server freezes because of fail2ban

Lately I've experienced some problems with my server freezing or having network problems (I can't really tell which at this point). I'm running OpenSSH on port 443 and it seems fail2ban's anti SSH ...
3
votes
0answers
2k views

Linux Mint 16 randomly freezing and freezes always after suspend wakeup

I've just installed Linux Mint 16 Cinnamon on Dell Latitude E6420. During an hour of use the desktop would become unresponsive and I was unable to access any TTY. It just froze up. The same thing ...
3
votes
0answers
2k views

System freezes upon executing any boot option in a live USB installation of Mint

Problem I'm trying to install Linux Mint 16, 64-bit, MATE using a live USB. The boot option menu itself is responsive and work as expected. However, when I execute any of said boot options, the ...
3
votes
0answers
84 views

Window content freezes

I recently started using Kanotix, a Debian based distro that loads itself into RAM on boot, and i'm loving it. But this is the second time I have this problem, and I was wondering what caused it and ...
2
votes
2answers
14k views

How to fix non-responsive Ubuntu system?

I use Ubuntu. Sometimes, the system does not have any response with mouse and keyboard. Is there any way to solve this problem except hitting the reset button on the machine?
2
votes
2answers
878 views

Linux freezing randomly

My Computer has been freezing a lot lately, and with no apparent reason.It freezes even if my usage is 3% CPU and 9% RAM. I was using Windows 8 until I decided I'd try to move on to linux, so I ...
2
votes
2answers
2k views

Make iotop show only the most disk-intensive item

My laptop (no VM, just plain Ubuntu with encrypted home) freezes for 3 minutes a few times per day. During these 3 minutes, the disk LED indicates intense disk activity, and I can't even move the ...
2
votes
1answer
2k views

Mint 15 frozen at startup, don't know why

yesterday I installed Mint 15 MATE on my laptop. Everything worked perfectly, so I installed some packages (python-django, mysql-server, and some other python modules). I also made an apt-get update ...
2
votes
1answer
371 views

Local, regular file causes `stat` or `ls -l` to hang

I've seen a few different questions about ls hanging. It's usually because they use the -l switch, which causes a stat on the file, which in turn is a bad symlink or pointing to an NFS mount or some ...
2
votes
2answers
627 views

How to troubleshoot a computer freeze from liveCD?

I'm helping my dad fixing his old computer. I am now running it from Fedora 16 with XFCE Live CD. If I try to install, as soon as it gets to the part where it writes partition to disk however, the ...
2
votes
1answer
667 views

How can I prevent systemd from freezing my system when Flash dies?

Since a recent update, when I quit a web page containing a Flash animation in Firefox, the plugin-container process becomes a zombie, and then the systemd-journald process (also maybe something like ...
2
votes
2answers
263 views

What is freezing my desktop every second (like clockwork)?

Recently, after using my desktop machine for a day or so, the oddest thing will start happening: Every second, the desktop will briefly freeze, then continue, like a heartbeat. The interval is one ...
2
votes
1answer
142 views

Is this task freeze related to ReiserFS (v3)? (or: is ReiserFS getting so old that it should be actively replaced?)

I just had a weird system freeze that I resolved using alt-sysrq-e. Here's my dmesg: https://gist.github.com/1609263 I was wondering whether it might be some kind of deadlock in the reiserfs3 code ...
2
votes
0answers
175 views

Desktop suddenly becomes unresponsive to mouse (moving/focusing/clicking UI elements)

I have an annoying problem where my desktop suddenly becomes unresponsive to my mouse. This always happens randomly, at random times. Sometimes I can work for hours with no problems, sometimes this ...
2
votes
0answers
92 views

How do I speed up recovering “stuck” cifs mount?

I have a cifs mounted like this: mount.cifs -o uid=myuser,user=...,dom=... //IP/Share /some/mountpoint/ When I try to access it after period of inactivity (or when the network is inaccessible), it ...
2
votes
0answers
149 views

linux mint hangs - how to find a reason?

My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It usually looks like a white or black screen (or off if the lid was closed). CPU seems to be a ...
2
votes
1answer
282 views

wpa_supplicant nl80211 hangs linux mint frequently

My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It may look different - white screen, black screen, screen freeze. Checking syslog after hangs ...
2
votes
1answer
825 views

My Debian freezes

I installed a fresh Debian 7 install, but it freezes from time to time, and when it happens (quite often indeed) only the mouse can move around but everything is blocked. All I can do is restart. I ...