Ubuntu Servers :: How To Diagnose System Crash
Apr 17, 2011
I am running Ubuntu 10.10 (amd64) on an Intel Atom 525 motherboard. I have a 5-bay SATA enclosure connected to my system through a Syba SD-SATA2-2E2I PCI card (uses the SIL3124 chipset). Under small to moderate load (transfer speed: ~25 Mb/sec), this setup works perfectly. Under heavy load (transfer speed: ~40 - 70 Mb/sec), the system crashes. By crash I mean I loose SSH connectivity, I can't ping the system, etc. The only solution is a hard reset. Initially, I thought this was a SAMBA problem so I logged into the system and tried doing a copy directly from the SATA enclosure to the system disk (connected directly to the motherboard). After 100 GB copied (at ~75 Mb/sec), the system crashed. My question: I am fairly new to Linux and Ubuntu. How would I go about diagnosing this problem?
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Dec 15, 2010
My server crashed last week and I'm trying to diagnose why. /var/log/messages contains the following error messages, which indicate that the server's memory peaked. I would like to discover what process caused the memory peak. Being that "httpd invoked oom-killer", can I conclude that httpd was the cause of the memory peak?
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Jun 15, 2010
I am having a bit of a problem with my Ubuntu Server 10.04 install. I think it might be a kernel problem. Basically, what happens is when I copy a large file (a 160GB disk image) to my drive (>60GB) the system consistently crashes after about 60GB of the file is transferred. It doesn't matter if I am sending the file using cifs, or over SSH. Checking syslog (paste dump here), it seems these flush errors always appear shortly before the crash occurs. The destination filesystem is a hardware RAID 10 array with 2TB of space. It is formatted as EXT4.
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Jun 26, 2010
I am struggling to get my wireless usb working on a fresh installation of Ubuntu Server 10.04, but it works just fine on a fresh install of Ubuntu Desktop 10.04. So I am trying to work out what's causing the discrepancy. I know the Server version is a "minimal install" of Ubuntu, so something must be missing that affects its overall abilities.
I am planning to compare the file system of a totally fresh Desktop version with a Server version - and would appreciate as much additional brain-power as possible to assist in the plan/execution of what I should be comparing. I hope this will throw up a solution as to what is NOT installed/configured on the Server version that prevents my wireless from working. [It will teach me a lot as well ] COMPARISON PLANAll programs installed on both file systems (looking for differences) Program differences which affect network setup and related hardware (I'm not sure of what this list should have on it) Related configuration files which might affect connectivity (same here - not sure what configures what at this stage)
* Do $lsmod to look for installed wireless drivers Miscellaneous tests
* Disable security on wireless router to see if security config is the cause I'm not sure if the kernel build will be different and if so how to establish this... but somehow wonder if this affects the outcome
If anyone is willing to assist in filling out the gaps in this plan I would really appreciate it. Or maybe there is a better way?
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Apr 12, 2010
i recently switched from slackware to debian because my laptop kept freezing up on slackware, and now it's doing the same on debian on slackware i would get this error in syslog: "hpet: compare register readback failed" at the exact time of lockup, which would leave me with a blinking capslock led indicator, and a completely frozen system (not even magic sysreq sequence would do anything) now on debian, same symptoms only there's nothing in syslog, and no blinking capslock led hardware is: i7 720q intel pm55 chipset nvidia gt 240m laptop model is lenovo ideapad y550p this will occur both in X and at the console i am using my own kernel as the default kernel doesn't support my ethernet adapter i have tried disabling hpet at boot, but there was no difference i have tried the patch posted here
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Jun 28, 2010
I can't update, download packages, or even diagnose due to an elusive error.
If I try to update or check using terminal I get this:
I even tried to restart in recovery mode to check for broken packages and I got this error:
I usually find answers in the documentation but this time I'm really stumped. I am Running 64 bit Ubuntu 9.04.
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Dec 23, 2010
Where does one look in terms of diagnostics after a system lockup and hard reset? For example, one of my computers, running Fedora 14 i686, has taken to locking up quite a bit lately. My only way out is a hard reset. Now, once the thing is booted back up I'd like to try to figure out where the problem lies. Where do I look? Will any of the log files reveal anything relevant to me? If so, what sort of things would I be looking for. Keywords?
This same box also locked up when I had Fedora 14 x86_64 installed. I had read that there were some issues with the newer 64 bit kernels that were causing lockups and / or extremely high loads. This is why I switched back to the 32 bit version, 2 days ago to be exact. The box gets little use. It's a toy really and not my main "daily use" computer. It is, however, running folding@home. Maybe that's where the problem is. About 15 minutes ago I called home and had my wife reset the box, then I logged in from work and stopped the folding service. I'll have to see if it locks up without folding running. Folding was running on this box when I had the 64 bit version installed also.
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Jun 26, 2011
I've been getting some system freezes when running blender on a new system (using about 1/2 my 8GB memory, AMD Phenom II x6 1090T+default AMD CPU cooler, ECS A880LM-M motherboard, Corsair 1333 DDR3, 2x4GB). PS voltages (measured off MOLEX plug) 12.05VDC and 5.2VDC. Tried BIOS resetting defaults. I'm trying to narrow down the problem with the MEMTEST v4.0. It gets through all tests fine until test #7 (block move) and starts throwing a ton of errors, and about 2/3 of the way through that test it says "unexpected interrupt, halting CPU0." All the listings say "28dbbd11" (this varies from run to run, except the 'Stack:' listing seems to count up from that number). I've tried unplugging one memory module and then swapping them as well as their positions. Same result always: block moves throw errors, followed by halting CPU0. To me this suggests the motherboard or the Phenom II. But I don't know how to test these. Can someone give the next step in diagnosis? I did find this link, but I'm not sure how it differentiates between my error and something specific to either the MOBO or CPU:
[code]....
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Aug 30, 2010
I use release 11.2 and this one works very well. I try new release 11.3 and my system crash when I wont to start system on runlevel 5. There is Sempron 2 GHz CPU and nvidia fx550 graphics card. Keyboard PS2 does not responds but mouse on USB work well. When I start "safe" boot option system work well. What I can to do ? What I must change
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Jul 24, 2010
My computer crashes occasionally and all of the files that have been written in the last few hours seem to disappear. On XFS sometimes they turn up in lost+found after xfs_repair. The files in ext4 seem to be gone for good.Is there any way to force linux to flush the meta-data more often or something so my files stop disappearing?
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Mar 12, 2010
After a system crash while watching a video with vlc and downloading somthing, i can't reboot my system.In the secure mode i get this informations[4.774621] device-mapper: dm-rai45: installized v0.2594b[ 1166.832045] ACPI: EC: non-query interrupt recived, switching to interrupt modeNow the scree is black (20 minnutes later
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Mar 24, 2011
if my PC lags a bit it crashes!But I wouldn't think it would be an ordinary crash.Earlier today I installed Xubuntu 10.04onto my PC. Well, The installation was smooth and I was able to get it installed. Then all of a sudden when I was looking aroundmy PC got caught in a little lag.. And when it lagged this black screen came up and it said
"Starting Common Unix System; cupsd [ OK ] "
"Checking Battery State [ OK ] "
Then That screen disappears and these Straight gray bars come up and they cover the top of my screenAnd they just blink! I figured it might be a glitch so I went to go eat dinner.About 20-30 minutes later I come back and there still blinking.I tryed rebooting the system and trying again and it got cought in a little lag and the
"Starting Common Unix System; cupsd [ OK ] "
"Checking Battery State [ OK ] "
Came back up and it disappeared again and the bars came back!I tried reinstalling Xubuntu 10.04 but it came out the same result.I tried updating the system cause when I installed it it said I had 164 updates waiting.
_PC INFO_
Dell Dimension 2300 with Xubuntu 10.04 as the operating system
256mbs of RAM
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Feb 3, 2010
System specs:
Compaq presario 430-EB
4 GIG RAM
320 GIG storage
AMD athlon dual core x64 2.1 mghz processor
Nvidia 8200 M
I recently decided to partition my laptop wholly to ubuntu, so i installed ubuntu without any problem, then i logged on for the first time and i installed the driver to my monitor (nvidia) and i did sudo apt-get update which made me get all sorts of updates, untill the updating stopped at about halfway asking me to reboot the system.
I rebooted the system, but no matter what i do, if i run it in recovery mode or not, i always get stuck on this piece of code on a black screen:
Code:
fsck from util-linux-ng 2.16
/dev/sda1: clean, 148123/18841600 files, 1880615/75358899 blocks
init: udevtrigger main process (540) terminated with status 1
init: udevtrigger post-stop process (541) terminated with status 1
init: udevmonitor main process (539) killed by TERM signal
init: networking main process (544) terminated with status 1
Also, please no answers like "hav u tried liek reinstalling ubuntu lolz?" because i wouldn't bother posting this thread if i considered doing that -_-'
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May 4, 2010
It seems that watching an embedded video crashes my system every once in a while. Is there any way to figure out what is causing the crashes or fix it?
Some extra info - The cpu usage jumps to 45-50 percent when a embedded video is playing.
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Nov 29, 2010
I seem to be having a problem on the new Kernel (2.6.35-23) with the system randomly freezing.
I have installed a number of things in recent days leading up to this problem, but when i boot with the old kernel i don't seem to have any issues. From this i am guessing its the new kernel.
The freezing seems (although i am not sure) to be worse when Rhythmbox is running. When it happens everything freezes, the playing song skips, replaying the same one second of music over and over. All the hotkeys stop and the mouse cursor stops responding.
I have seen people talking about system logs to look at system crashes but i don't know how to show those. I also doubt my ability to interpret them.
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May 2, 2011
After my computer crashed due to an electrical failure in the house, every time I try to boot up (I'm using Ubuntu 10.04) I get the following error:
mount: mounting /proc on /root/proc/ failed: No such file or directory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg.
I'm then put into initramfs
I assume that this is because the system wasn't unmounted properly but I haven't been able to find the best way to solve this problem.
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May 26, 2011
Occasionally, kwin will crash and recover itself, but afterwards, my system starts using GTK notifications (yellow popup bubbles with the pie graph countdown timer). I've tried restarting knotify4 to no avail.
kde 4.6.2 on kubuntu 11.04
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Jul 30, 2011
i have a problem with adobe flash player. when i watch videos or blip.tv or other video streaming sites, my computer crashes randomly during the video. it stops responding, i can't use keyboard and mouse. the only way to recover is a hard reset.it happens in ff, opera, chromium and chrome. i had this problem on flash player 10 and on 11-beta i have it too.i running ubuntu 11.04 natty 64-bit. kernel: 2.6.38-11-generic. gnome 2.32.1. with unity.
short config of my pc:
cpu: amd athlon x2 64bit dualcore
mobo: asus m2n68 (+newset bios there is)
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May 8, 2010
I came home from my walk and my monitor was black, no activity when hitting keyboard or mouse. Shut down machine and then waited for reboot, it sticks to the same moment as picture posted. I tried dif boot seq in the selection but no luck. I cant find my boot disc.
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Jun 6, 2010
bit of a server noob having built a server to hold a php website for a client hosting at home, I have some experience, but VERY limited and don't speak fluent server.My problem is that overnight each day apache on my clients server stops responding. I can still access via putty / webmin.The best I can see it, it seems that apache 2 opens too many child processes and chokes the system. My reasoning for this is:-Though I have max child set to 20 with a keep alive of 30 there are dozens of child processes 'apache2 -k start' running, some of which were started 9.5 hours ago.
-I can stop apache, though that doesn't kill these child processes. I can terminate the parent process which does kill the child processes, however restarting apache after killing the child processes results in a system crash. Rebooting the server remotely after apache has stopped responding also results in a server crash. That is NO response on any port.I would be happy to display any pertinent server config/logs etc if anyone can help me troubleshoot this?
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Apr 27, 2010
I have a custom compiled kernel which seems to work OK. However, during boot, I get:
Apr 27 21:16:14 poni kernel: eth0: Tigon3 [partno(BCM95784M) rev 5784100] (PCI Express) MAC address 00:21:70:90:2d:6c
Apr 27 21:16:14 poni kernel: eth0: attached PHY is 5784 (10/100/1000Base-T Ethernet)
[code]....
System continues to boot OK and everything seems to work fine as I expect. I am not sure what the above causes. It looks related to USB, but I am not sure. lsusb gives:
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
[code]....
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May 1, 2010
As the title says, i was in the middle of the upgrade, when the system froze then a black screen with the text similar to: starting apache ..... starting ..... ... in that way, but with more text, i could not remember the exact details. When i boot up, it say /dev not found, and other errors, and a weird black screen that seems to be loading modules appears, but never finishes and starts to act strange. Any way i can get this fixed without just copying my data and reimaging my partition.
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Apr 7, 2011
I have a Dell studio running ubuntu for two years now. I had ubuntu 10.04, but a few days ago, the update manager started to bug me that some stuff don't work properly and that I need to to a partial upgrade. I postponed that for a while, and all worked fine, but I finally had sometime and clicked "yes", all began collapsing:
1) the update manager crashed while updating.
2) I rebooted and ran it again. same crash at the same stage.
3) I decided, god knows why, to do a full upgrade to 10.10, which also crasehd.
Now it won't even boot. It always get stuck at a line saying "no IPv6 routers present" or something of that sort. when I switch off manually the wireless switch on the laptop, the boot gets stuck a bit earlier, on a line that says: "laptop login:"
EDIT: I just remembered something which might be important: I had a hibernation problem on the upgrade to 10.04, so I played around a bit with that. now it uses libgcrypt, and I remember I set up something manually then, but I can't remember what.
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Jun 17, 2011
I've recently installed release 11.04 and am trying to get wireless networking operational. I'm using a netgear wg111t usb wireless adapter. I've installed ndiswrapper and have got the netgear windows drivers installed ok. My problem is when I try to connect wirelessly I get a system crash, think it tends to be called a kernel panic in linux. The network connection is confirmed and about 5-10 seconds later the crash happens. I've updated the linux kernel to 2.6.39-0-generic but thats not helped.
I can connect with a cable but that is somewhat limiting.
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Aug 22, 2011
how can I disable the automatic file system check after power outages or system crashes? The check sometimes prompts for a key (ignore, repair etc.) but the panels do not have a keyboard.
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Apr 2, 2010
When trying to run MS Communicator 2007 in XP hosted by Ubuntu 9.10 using VirtualBox 3.1.6, the Communicator process inside the virtual image maxes out (90%+) and it becomes unusable (host reports VBox at 50% CPU). If I migrate that image to a Windows host, VBox does not show the same issue (Communicator process ranges from 20-35%). Creating a similar VMware image on the Ubuntu host and running it also does not show the issue (Communicator process ranges from 20-35%). So obviously there is some kind of bottleneck occurring with VBox on Ubuntu. My questions is, how do I figure out what that bottleneck is?
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Sep 4, 2010
I want to get the count of host reboot and host crash per day.Host reboot - i use last command and make sure the count.How to catch the System Crash ?.
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Jan 6, 2011
"system crash" means that:(1)I can ping it , but can not connect to it (via ssh or http or anything else)(2)the major role of that machine is to run a web application written in java, every 3 weeks(almost that), the users inform us and say they can log in that web application , and we find the situation just like (1) says.When this happen , we can only restart the machine by pushing the power button.(It's sad !)I've try to read all the log files located in /var/log but find nothing interesting.
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Dec 10, 2010
after a system crash (no response, i had to press the power button) evolution invokes the configuration wizard every time it starts, but i beleive all files are in place (~.evolution/mail/local and ~.gconf/apps/evolution). what can i do to repair the config? will i destroy anything when i setup my accounts again? when i re-setup my mail accounts, will evolution reuse the folders and show my old mails again, or will they be erased?
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May 13, 2010
Why does flash crash my system when I'm watching a video online? I'm fairly certain that it's flash.
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