Crash with >2k clients

[tezc]

[2021-05-24 23:45:30][ERROR][node0] src/state.c:state_on_client_request:1272, msg : Session does not exist : 254057
 [errno : 0, error : Success] 

Signal : [6][SIGABRT] 

----------------- CRASH REPORT ---------------- 

 Caller [0x7f8d1160a18b] 

/home/ra/Desktop/resql/cmake-build-debug/example/single_test(+0x144c84)[0x560df8a7dc84]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x153c0)[0x7f8d119203c0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcb)[0x7f8d1160a18b]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x12b)[0x7f8d115e9859]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(rs_exit+0x0)[0x560df8968385]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(state_on_client_request+0xf0)[0x560df89620b5]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(state_apply+0x3bf)[0x560df89626d6]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(+0x21069)[0x560df895a069]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(+0x22fd0)[0x560df895bfd0]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(+0x23e5b)[0x560df895ce5b]
/home/ra/Desktop/resql/cmake-build-debug/example/single_test(+0x246ea)[0x560df895d6ea]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x9609)[0x7f8d11914609]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43)[0x7f8d116e6293]

--------------- CRASH REPORT END -------------- 

Signal handler completed! 

[tezc]

Meanwhile, ulimit -n is 256, on MacOS.

Logs show more than 2k clients but probably most of them were hung as max fd count was 256