I've recently gotten the following error from my PHP:

WARNING: [pool www] child 42475 said into stderr: "*** glibc detected *** php-fpm: pool www: corrupted double-linked list: 0x00000000013fe680 ***"

I'm not very bothered by this issue, and not very interested in fixing it. But I'm very interested in understanding what this error 'corrupted double-linked list' actually means, because I haven't seen it before. I believe to know what a double-linked list is, but I failed to produce a program that triggers this error.

Could somebody provide me a short snippet of code that causes the glibc to say 'corrupted double-linked list' when I compile and execute it?

memory-management glibc
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