Wednesday, June 4, 2025

Interesting Troubleshooting of a MySQL Crash : filling then freeing the disk

I recently troubleshoot an interesting MySQL crash, and I think it is worth sharing (with the related bugs).  MySQL crashed when the disk was full, you can see the free disk graph below.  The Y-axis is in the tens of GiB scale and the X-axis is in the hour scale.  Can you guess what happened ?