Archive | Obscure Errors

Errors are not always very descriptive. I am collecting them here to help others solve them more quickly.

Symlinks within shared folders in VirtualBox: Operation not permitted and Read Only Filesystem

This is not a bug, it is a security feature of Virtual Box. Nevertheless it is annoying when you want to use your virutal system as a build system which needs symlinks in shared folders. To enable symlink creation, do the following: Shut down your virtual machine, close all VirtualBox windows, including the main GUI […]

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Mysql screenshot

A solution for MySQL Assertion failure FIL_NULL

A defective RAM module recently caused data corruption in MySQL tables. MySQL would log the following to /var/log/syslog  in regular intervals, about every few minutes:

Reading MySQL documentation and various blogs didn’t help much. I ran CHECK TABLES  on all the tables and they all reported OK. Then I ran

and still all tables reported OK. […]

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Crash

Adventures with various Segfaults due to defective RAM

If you get various segfaults on your Linux server, like these:

or:

or

or

etc. etc., then, no, your system is not suddenly crazy. Nor are you. It is highly likely that you RAM is defective. You should reboot your server and run the  RAM test from your boot manager (Grub […]

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