To find out: # perf record -e signal:signal_deliver ...wait for QEMU shutdown... ^C # perf script qemu-system-x86_64 2319136 [001] 1062886.415312: signal:signal_deliver: sig=2 errno=0 code=128 sa_handler=7fc6ccfbabc0 sa_flags=14000004
sig=2 is SIGINT. This is just an example, I didn't run virtiofsd.