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151 Comments
- Cowfrommars, on 10/10/2007, -21/+197What are you talking about? Hasn't Digg taught you? Only windows crashes...
- ropers, on 10/10/2007, -1/+78From the aforementioned article:
"<Alt><SysRq><r> Turn off keyboard raw mode. This can be useful when your X session hangs. After issueing this command you may be able to use <Ctrl><Alt><Del>.
<Alt><SysRq><e> Send the TERM signal to all running processes except init, asking them to exit.
<Alt><SysRq><i> Send the KILL signal to all running processes except init. This may be more successful in killing runaway processes than the previous key combination, but it may cause some of them to exit abnormally.
<Alt><SysRq><s> Run an emergency sync (cache write) on all mounted filesystems. This can prevent data loss.
<Alt><SysRq><u> Remount all mounted filesystems as read-only. This has the same effect as the sync combination above, but with one important benefit: if the operation is successful, fsck won't have to check all filesystems after a computer hardware reset.
<Alt><SysRq><b> Reboot immediately without syncing or unmounting your disks. Your will likely end up with filesystem errors." - mal1964, on 10/10/2007, -0/+60Thanks. we have extremely cold winters in Minnesota so I know this will be very handy
- ropers, on 10/10/2007, -2/+51I would have liked a little more background info. Not just "press these keys", but also "here is what they do".
- DangerCollie, on 10/10/2007, -3/+47I have one token XP box left on my home network...it's never crashed that I can remember. And that after putting some really heavy loads on that box. Of course, I don't surf with it, either. It's strictly for audio and video work. Windows is a fine operating system...until you connect it to the internet.
- inactive, on 10/10/2007, -1/+39Would be nice if it didn't require 3 hands with a laptop and "fn" key for print screen.
- rockrapdude, on 10/10/2007, -1/+35FTAC: "I heard of this trick before at Linuxquestions.org but the poster of the tip there used the order: “Raising Skinny Elephants Is Utterly Boring”
R gives back control of the keyboard
S issues a sync
E sends all processes but init the term singal
I sends all processes but init the kill signal
U mounts all filesystem ro to prevent a fsck at reboot
B reboots the system - shaelen, on 10/10/2007, -2/+31It would be easier to remember it as "busier" backwards.
- ropers, on 10/10/2007, -2/+31Ok, I've now "used the Google", and the bottom of this page has an explanation what the individual Alt+SysRq keys actually do:
http://linux.about.com/od/linux101/l/blnewbie5_1.htm - bruinexmo, on 10/10/2007, -16/+44My Ubuntu system has never frozen in the nine months since I dropped Windows.
- h0zae, on 10/10/2007, -2/+26osx users, like me, are afraid to make Steve mad - so we keep it to ourselves
- DarthMalcontent, on 10/10/2007, -1/+24Really Excellent Information Solves Ubuntu Blunder
- ers35, on 10/10/2007, -3/+24"Freezing"
- inactive, on 10/10/2007, -5/+23dugg for "You finally got your Linux environment to crash."
- da5id, on 10/10/2007, -3/+20Show me 7 years of linux logs. Oh, I forgot, no one uses same version of linux that long
- hammoudith, on 10/10/2007, -0/+16http://en.wikipedia.org/wiki/Magic_SysRq_key
- carbonfree314, on 10/10/2007, -1/+17What's so sarcastic about it? I use Windows all the time and never experie
- matx, on 10/10/2007, -1/+16Note of caution: You also need a keyboard!
- aim2free, on 10/10/2007, -3/+17It should not. If your system often hard locks it is something weird with your system. For instance, my laptop (m200) which is running an ubuntu system usually have an uptime between 60-90 days. When it dies it is because of I've forgot to recharge the battery enough, as I never turn it off. (I have an extra 10hour battery in my backpack).
However, around kernel 2.6.12 I had some problems there were something with USB interrupt handling that had been causing problems. I have several systems running ubutun most have kernels between 2.6.15 and 2.6.20 but they are never locking. They are up for many months. Only reason I shut them down is because I want to change some hw. - mvent2, on 10/10/2007, -4/+18We know, thats why we switched to linux in the first place.
- florin, on 10/10/2007, -0/+14Some distributions (Fedora, Red Hat, CentOS) disable Alt-SysRq by default. In order to enable it, edit /etc/sysctl.conf and change this variable to 1:
kernel.sysrq = 1
Then do a "sysctl -p" to activate the setting. Now the Alt-SysRq combinations will work fine. - inactive, on 10/10/2007, -2/+14Rebooting Windows without a clean file system unmount will generally cause much worse problems on Windows than on Linux. You can for instance nuke your entire registry.
With that said I normally do it on both systems and it takes quite a few times for it to cause major problems (by which time I need to reinstall generally anyway).
Most Linux and Windows both use Journalling file systems so most of the time instantly rebooting won't cause any major problems. - dhughes, on 10/10/2007, -2/+13M is for the million things she gave me.
O means only that she's growing old.
T is for the tears were shed to save me.
H is for her heart of purest gold.
E is for her eyes, with love light shining.
R means right, and right she'll always be. - crazybrit, on 10/10/2007, -1/+12Busier _backwards_.
- Ryuuzaki, on 10/10/2007, -0/+9The original article is a disaster, an example of a bad article, giving a "magic recipe" without explaining what it does. More importantly, it doesn't explain S and U, so people are likely to press the next key when the I/O they caused to happen hasn't stopped (actually maximizing the likelyness of data loss.)
For more information, refer to linux documentation (there are more keys), most likely:
/usr/src/linux/Documentation/sysrq.txt - Milamber, on 10/10/2007, -1/+10It might be the alpha software he's using - unstable by its very nature.
- dhughes, on 10/10/2007, -0/+8 No Linux geek will try this because he doesn't want to ruin his uptime stats.
Maybe someday he'll give it a go or he'll get his friend to try it. - richbradshaw, on 10/10/2007, -0/+8No, busier backwards is reisub, which is the right order... Good tip!
- stevea1210, on 10/10/2007, -0/+8I just tried this on a laptop running 2.6.20-16. The result, laptop hung for a minute, then opened 83 screenshot instances.
damn FN key :) - crazybrit, on 10/10/2007, -4/+12Good for you. Mine freezes all the time.
- lufthanza, on 10/10/2007, -0/+7This article explains a safer way to reboot a hardlocked system. Please RTA before calling it rubbish.
- da5id, on 10/10/2007, -3/+10lol
- StealthAgent87, on 10/10/2007, -5/+12R gives back control of the keyboard
S issues a sync
E sends all processes but init the term singal
I sends all processes but init the kill signal
U mounts all filesystem ro to prevent a fsck at reboot
B reboots the system - bsmang, on 10/10/2007, -0/+7I'm no kernel guru, but I would think you'd want to sync after killing processes - being that processes may write stuff out upon their deaths.
- RockinRoel, on 10/10/2007, -2/+9...others ***** up your Windows installation for you.
- DangerCollie, on 10/10/2007, -0/+6I use Kubuntu and can measure the uptime in months and that on a multi-user machine. My one problem happened during a power outage while I was logged in. Powering off Linux is bad, um-kay? Used a disk repair utility to get it to boot, backed up all the user files and reinstalled. It's on a UPS now but I'd still like to see Canonical work on that power off restore.
- inactive, on 10/10/2007, -7/+13Most Windows crashes are due to ignorant people installing poorly written shareware software that replaces critical system files with older copies of their own. Most of the rest of the crashes are due to faulty and/or incompatible hardware.
Those of us who know how to build a PC and are familiar with what is legit, well-written software vs. shady, unpredictable shareware programs don't have all these "crashes" that most of you inexperienced people see. - joe90210, on 10/10/2007, -0/+6I also strongly advise not pressing the power button, when I started using ubuntu, I was completely amazed at how fragile it was when you shut it down with the power button after it freezes. In the first week I had it when not everything was configured yet and crashes were frequent, pressing the power button resulted in an unbootable system twice.
- inactive, on 10/10/2007, -0/+6Yeah, the developers responsible for the Digg comment system aren't very good at this HTML thing.
- inactive, on 10/10/2007, -0/+6It's not actually necessary to reboot in all situations, you can use Alt+Sq+RK to kill the xorg server if it has crashed, often this will allow you to recover a frozen system without needing to reboot.
I haven't had any problems with frozen xorg for quite a long time now, back when I was compiling custom kernels I would run into problems with frame buffer drivers conflicting with closed source xorg ones and such but now days there hasn't been any problems. Compiz was a bit unstable a while back but that also seems to have been sorted out. - bnolsen, on 10/10/2007, -1/+7Alt-SysReq-R is probably the most useful since 'X' is generally the least stable portion.
Linux generally only locks when hardware is unstable OR because of crappy drivers, in the past binary ATI drivers were the main culprit, of late older USB wireless 802.11b have been causing crashes (new wireless stack).. - richardiscool, on 10/10/2007, -1/+7Erm...
To reboot normally, I'd click the power button and then click reboot.
If it had crashed, I'd restart X by pressing ctrl, alt, and backspace.
In the very unlikely event that neither worked, THEN you'd use RESUB. - dasunst3r, on 10/10/2007, -0/+6Does anybody know how fast someone should do this sequence? Should a person doing this wait about one second before doing the next key?
- apocobring1, on 10/10/2007, -2/+8Shh Danger, you are only supposed to make comments when something goes wrong...that way people can continue claiming that the small % of people that have continual problems are actually the majority. I run XP on my computer and have for 3 years, since I'm at least slightly computer literate it hasn't ever crashed on me.
- HHP2K, on 10/10/2007, -0/+6You're a retard. An angry one at that.
- ropers, on 10/10/2007, -1/+6It's enabled by default in Ubuntu.
- dhonn, on 10/10/2007, -0/+5at least when Linux crashes you can do something about it. You cant do ***** when windows locks up.
- AnusBreaker, on 10/10/2007, -1/+5anyone know if this works for *BSD?
- TrinitronX, on 10/10/2007, -1/+5Hmm... didn't know that you could change the order from RSEIUB... but i guess the wiki page has been updated since. I still like syncing the disk as soon as possible though before killing processes.
http://en.wikipedia.org/wiki/Magic_SysRq_key - shamess, on 10/10/2007, -2/+6Seconded. Methinks the people that buried this comment are the ones that keep crashing.
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