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renerocksai avatar renerocksai commented on August 17, 2024

Hi, interesting. The error comes from this assert.

So maybe, the bookkeeping of self.count is not done correctly when inserting after a delete. It's an interesting bug to play around with. You see here that a count is being kept. It needs to be in sync with the hashmap. See also the potential race condition comments.

I hope that helps. It seems that your usage pattern :

127.0.0.1 - - [Sun, 04 Aug 2024 18:07:44 GMT] "GET /users HTTP/1.1" 200 111b 228us
127.0.0.1 - - [Sun, 04 Aug 2024 18:07:52 GMT] "POST /users HTTP/1.1" 200 22b 153us
127.0.0.1 - - [Sun, 04 Aug 2024 18:07:52 GMT] "GET /users HTTP/1.1" 200 162b 201us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:13 GMT] "POST /users HTTP/1.1" 200 22b 548us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:13 GMT] "GET /users HTTP/1.1" 200 213b 878us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:22 GMT] "POST /users HTTP/1.1" 200 22b 159us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:22 GMT] "GET /users HTTP/1.1" 200 263b 208us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:32 GMT] "DELETE /users/1 HTTP/1.1" 200 22b 190us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:32 GMT] "GET /users HTTP/1.1" 200 212b 198us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:47 GMT] "PATCH /users/2 HTTP/1.1" 200 25b 544us
127.0.0.1 - - [Sun, 04 Aug 2024 18:08:47 GMT] "GET /users HTTP/1.1" 200 204b 895us
127.0.0.1 - - [Sun, 04 Aug 2024 18:09:01 GMT] "DELETE /users/2 HTTP/1.1" 200 22b 80us
127.0.0.1 - - [Sun, 04 Aug 2024 18:09:01 GMT] "GET /users HTTP/1.1" 200 153b 979us
127.0.0.1 - - [Sun, 04 Aug 2024 18:09:14 GMT] "POST /users HTTP/1.1" 200 22b 620us

... triggers the count to get out of sync. 😄

Unfortunately, I don't have time to dig into it but please feel encouraged to hunt the bug down yourself. It will be zig-educational 😄

from zap.

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