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Questions tagged [server-crashes]

240 questions
363
votes
5 answers

Anyone else experiencing high rates of Linux server crashes during a leap second day?

*NOTE: if your server still has issues due to confused kernels, and you can't reboot - the simplest solution proposed with gnu date installed on your system is: date -s now. This will reset the kernel's internal "time_was_set" variable and fix the…
Bron Gondwana
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26
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2 answers

Server crash with ascii NUL characters in syslog ( ^@^@^@... )

I have some dedicated server hosted by a OVH (French service provider). OS : Ubuntu 12.04 x64 A few months ago, one of my server crashed. The only weird thing was some "ASCII NUL" caracters in the syslog…
KilianD
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16
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3 answers

How to determine cause of system crash?

My server crashes about once a week and does not leave any kind of clue as to what's causing it. I have checked /var/log/messages and it just stops recording at some point and starts at the computer post information when I perform a hard reboot. Is…
Nahydrin
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15
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2 answers

CRITICAL STRUCTURE CORRUPTION on Windows Server 2012 R2

I have a Windows Server 2012 R2 virtual machine; yes with all the updates. Additional software include Microsoft SQL Server 2014 (was 2012 on a previous VM). The web hosting company includes xenpci.sys (EJBPV XenPCI Driver (Checked Build), James…
Sarah Weinberger
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12
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2 answers

Why is Linux kdump not writing to /var/crash?

It's happened again! I have 4 servers which are crashing periodically, and there is no information printed to the system logs or the serial console. In addition, the Linux kdump service isn't writing core dumps to the default location of…
Stefan Lasiewski
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12
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4 answers

How to use kdump/crash to investigate an OOM issue?

The problem A server crashed after multiple "Out of memory" messages and I am trying to pinpoint the culprit. If it is in userland - which process. If it is in the kernel - which kernel module. Details I am trying to find out how to use the crash…
chutz
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11
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4 answers

How can you distinguish between a crash and a reboot on RHEL7?

Is there a way to determine whether a RHEL7 server was rebooted via systemctl (or reboot / shutdown aliases), or whether the server crashed? Pre-systemd this was fairly easy to determine with last -x runlevel, but with RHEL7 it's not so clear.
kwb
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9
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2 answers

What can cause ALL services on a server to go down, yet still responding to ping? and how to figure out

It has happened to me already twice within very few days that my server goes down completely, meaning http, ssh, ftp, dns, smtp, basically ALL services stop responding, as if the server had been turned off, except it still responds to ping, which is…
matteo
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8
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1 answer

Dell PowerEdge server crashed, how to repair? What happened? Information inside

I am currently in high school and run our school's website. This summer, our SysAdmin was diagnosed with cancer, and he went off for treatment, so I have been thrown into an interesting situation. I'm really not sure what is wrong with this web…
ankurkdotcom
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8
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3 answers

What is wrong in my php-fpm configuration?

I have a 64-bit server but only 256MB of RAM. So, I moved to nginx server with fast-cgi to connect to PHP. I have PHP 5.3.6 running. The issue is that after every two or three days when I try to access any PHP page then I get server internal error.…
AppleGrew
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7
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3 answers

How do you force Windows to keep memory dumps?

I'm trying to debug a sporadic problem with some Dell tablets out in the field that crash intermittently. Looking at the Event Viewer logs, it seems that Windows automatically creates a memory dump file after the crash. But Windows also…
soapergem
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7
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2 answers

memory&swap are full, can't ssh; any option other than physical restart?

by mistake, i executed some applications that used all memory (and i think swap) on my ubuntu server and its now crashed, SSH doesn't work and freezes. Do you know any other options other than following solutions: physically restart the…
Ehsan
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2 answers

At my wits end. What could cause my server to randomly hard reset? (Seems to be related to ZFS)

I have a server that I built years ago that has worked like a champ. But within the past few months it has started to become seriously unstable with no discernible pattern. I have been debugging it and swapping out parts to no avail. I have replaced…
Zhro
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6
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0 answers

Server went offline for no reason except SIGINT?

We had a system go offline this morning. The only thing in syslog is: Mar 20 15:27:15 fooserver systemd[1]: Received SIGINT. Mar 20 15:27:15 fooserver systemd[1]: Starting Synchronise Hardware Clock to System Clock... Mar 20 15:27:15 fooserver…
DrDamnit
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6
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2 answers

Server freezes without kernel panic

We are running a KVM node which is crashing irregularly showing a very strange behaviour. The interesting thing is that we already had this problem with another node which crashed every 1-2 weeks. As we could not find a hardware issue, we began to…
smartenbergen
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