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after discovering last test faults I found that they freeze after unexpected sighup that didn't send in any our tests or inside acra-server. so I think it's some behaviour of circleci. when acra-server receive sighup signal then it fork new process to restart with new configuration and stop parent. our tests save pid of forked explicitly process but doesn't expect that parent process will fork new. so can't correctly stop child process. after that after this we have 2 conflicting acra-server
because in tests we send sighup with http api we doesn't need to receive it in acra-server and can ignore it to avoid blinking tests