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here is my system: base os: ubuntu 16.04

ubuntu 18.04 on virtualbox mem 4G cpu 2core

check kdump-config show it said "ready to kdump"

then
sysctl -w kernel.sysrq=1

to make crash echo c > /proc/sysrq-trigger

after then screen is freezing also there is no response I waited more then 10 minutes there is no rebooting

I can't understand why can not make vmcore file at /var/crash

could you help me?

thank you in advance

oops-again
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1 Answers1

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I had the same problem and solved it about 5 days ago. I took several crash dump tests and confirmed that they were performed perfectly.

The reason why the crash dump was not performed was because of the Virtualbox option issue, and the resolution was as follows:

  1. Settings -> Mother board -> I/O APIC~~ uncheck:** Virtualbox default is check
  2. Settings -> Processor -> PAE/NX check and VT-X /AMD-V check** : Virtualbox default is uncheck

For your information, my Ubuntu version is 18.04, Virtualbox version is 6.1.14.

user1141618
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