Maybe there is a bug for String.UTF8.encode and String.UTF8.decode

[victortanjh]

my test function is :
function putData():void{
let buf1 = String.UTF8.encode("bench_key_10000",true)
let str1 = String.UTF8.decode(buf1)
let buf2 = String.UTF8.encode(" the arg is " + str1, true);
}
when executing this function ,then it will crash.
if I change this function to be:
function putData():void{
let buf1 = String.UTF8.encode("bench_key_9999",true)
let str1 = String.UTF8.decode(buf1)
let buf2 = String.UTF8.encode(" the arg is " + str1, true);
}
or change it to be:
function putData():void{
let buf1 = String.UTF8.encode("bench_key_10000",true)
let str1 = String.UTF8.decode(buf1, true)
let buf2 = String.UTF8.encode(" the arg is " + str1, true);
}
it will not crash.

But I do not know why.

Can anyone explain this phenomenon? Thank you very much.

[romdotdog]

I can only reproduce on optimized

Here's a more minimal example

String.UTF8.encode("aaaaaaaaaaaaaaaaaaaaaaaaaaa\0", true);
__alloc(0); // String.UTF8.encode("");

It seems it's this check that is failing

assemblyscript/std/assembly/rt/tlsf.ts

Line 203 in 8611261

if (DEBUG) assert(blockInfo & FREE); // must be free

[github-actions]

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