507 Insufficient Storage

Hi Eli,

One of our sites, https://simpsoncoprojects.com.au/, returned a 507 error, even though there appears to be sufficient storage available.

I escalated this to server support for investigation. Their findings indicate that a plugin was causing the issue. The plugin has now been disabled, and the site is back online.

This appears to be an isolated case, but it may be worth reviewing on your end as well.

Below is from the server support:

We’ve completed a deeper investigation into the issue affecting your website and have identified the root cause.
 
The issue is being caused by heavy database activity originating from a WordPress plugin (GOTMLS – Get Off Malware Scanner).
 
We observed multiple database queries running for extended periods (several hours), with many processes stuck in a “Waiting for table level lock” state, and repeated queries targeting the wp_posts table related to gotmls_results.

| Id  | User          | Host   | db          | Command | Time | State              | Info                                                 | Progress |
+-------+-------------------------+-----------+-----------------------+---------+-------+---------------------------------+------------------------------------------------------------------------------------------------------+----------+
| 859  | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 11743 | Sending data          | SELECT  wp_posts.ID
                     FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_ | 0.000  |
| 910  | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 11722 | Sending data          | SELECT  wp_posts.ID
                     FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_ | 0.000  |
| 20288 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 7152 | Sending data          | SELECT  wp_posts.ID
                     FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_ | 0.000  |
| 20535 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 7125 | Sending data          | SELECT  wp_posts.ID
                     FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_ | 0.000  |
| 20941 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 7069 | Waiting for table level lock  | UPDATE wp_posts SET post_password = 'c700ab0bfe0fe3c7ef4e', post_modified_gmt = '2026-05-05 00:07:59 | 0.000  |
| 21048 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 7056 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '7782a10a5c8ffe5b8143c56 | 0.000  |
| 21182 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 7036 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = 'af3372bad5a7dfe1003a431 | 0.000  |
| 21633 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6947 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '621660500b0d084c786f317 | 0.000  |
| 21684 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6930 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '737de1fcab19687a5b1e359 | 0.000  |
| 22035 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6830 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = 'bab71dc0996420c410735d2 | 0.000  |
| 22478 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6709 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = 'f3a1c640c79bd39065e6efa | 0.000  |
| 22611 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6684 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = 'f0a77d6e22d4df246b7d023 | 0.000  |
| 22709 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6677 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = 'afcd4337824ffa888abcc1b | 0.000  |
| 22808 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6654 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '61199954610fbf0de9b0156 | 0.000  |
| 22844 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6647 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '64514e331dfd4185a9a79f5 | 0.000  |
| 23137 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6574 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '955afb340d72a3c68aae534 | 0.000  |
| 23209 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6552 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'gotmls_results' AND post_name = '314267f3d14a1e131922593 | 0.000  |
| 23805 | simpsonc_sw       | localhost | simpsonc_sw      | Query  | 6365 | Waiting for table level lock  | SELECT * FROM wp_posts WHERE post_type = 'go

Due to these database locks, PHP processes become stuck waiting on the database, leading to request timeouts (up to 900 seconds), exhaustion of server resources (Entry Processes), and ultimately resulting in 507 errors and site instability.
 
We recommend disabling the GOTMLS plugin immediately, as this should stop the database locking and restore normal operation, and then reviewing alternative security or malware scanning solutions.

I disabled the plugin and now the site is now back.

This is an isolated case but maybe you’d like to check this.

Thanks.

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