There are lots of suboptimal solutions for lots of problems out there. I don't know why it would matter if the Linux Kernel does the same mistake.
And I'm sure that wasn't the only solution. Just something somebody implemented and noone bothered to change it because it worked "well enough".
But I wouldn't be surprised if this is known to cause the kind of issue GCs are known to cause such as race conditions, resource exhaustion and stalling.
Let me do some quick research:
https://gist.github.com/bobrik/82e5722261920c9f23d9402b88a0b... https://nvd.nist.gov/vuln/detail/cve-2024-26923