app-compat: Assertion failed when running `node-gnu` with `app-elfloader` about unikraft HOT 4 CLOSED

I'll document what I've found till now, just to be written somewhere. I will also give the source names of some sources to easier to find the functions. The crash happens at the initialization of the openssl module, to be exact, in the ossl_lib_ctx_get_data function from context.c. The function attemps to read-lock the ctx->lock variable, which in our case is uninitialized(the structure is because it is a staically declared one). The initialization of this lock should take place in the OPENSSL_init_crypto function, when the ossl_init_config_settings(init.c) is called. This last function never gets called because before it, there is another lock on another rwlock that fails with EDEADLK and returns 0.

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Update. The problem appears in pthread_rwlock_wrlock function. Here, the function checks if the writer thread tries to acquire the lock. In the case it does, it returns EDEADLK. In Unikraft's case what happens is that the lock structure was just initialised and the current writer member is set to 0. Because the TID is also set to 0, the call fails. The solution would be to change the TID to something other than 0.

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@razvand This was solved by #885. I think we can close it.

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Solved by #885 , as mentioned by @flpostolache

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