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Interesting stuff occurred while I debug one of the unit tests on CI server (maven build actually). I connect to java process with strace -ff -e trace=network -p [pid] to trace network activity of build process. And that's what I saw: Process 26324 attached Process 26325 attached (waiting for parent) Process 26325 resumed (parent 26312 ready) Process 26325 detached Process 26324 detached Process 26320 detached Process 26317 detached Process 26308 resumed [pid 26308] --- SIGCHLD (Child exited) @ 0 (0) --- Process 26307 resumed Process 26308 detached [pid 26310] --- SIGCHLD (Child exited) @ 0 (0) --- Process 26310 detached [pid 25551] --- SIGSEGV (Segmentation fault) @ 0 (0) --- Process 26309 detached Process 26307 detached [pid 25717] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 25715] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 25713] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 25551] socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 163 [pid 25551] setsockopt(163, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0 [pid 25551] bind(163, {sa_family=AF_INET, sin_port=htons(6590), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 Process 26471 attached (waiting for parent) Process 26471 resumed (parent 25551 ready) [pid 25551] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 25551] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 26471] recvfrom(163, <unfinished ...> [pid 25551] socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 164 [pid 25551] setsockopt(164, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0 [pid 25551] bind(164, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 [pid 25551] getsockname(164, {sa_family=AF_INET, sin_port=htons(45728), sin_addr=inet_addr("0.0.0.0")},[16]) = 0 [pid 25551] --- SIGSEGV (Segmentation fault) @ 0 (0) --- [pid 26471] <... recvfrom resumed> 0x8e80618, 65536, 0, 0x6ef6aea0, 0x6ef6ae9c) = ? ERESTARTSYS (To be restarted) [pid 26471] --- SIGRT_29 (Real-time signal 27) @ 0 (0) --- Process 2647

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