Remove uncaught signal message

This message was supposed to help troubleshoot application that are
killed inside a container. But it can be noisy and doesn't really
help in most cases, e.g. it's expected in many cases that processes
are killed, message refers to PIDs/TIDs which are not actionable
outside the container execution.

PiperOrigin-RevId: 513627281

pkg/sentry/kernel/task_signals.go

@@ -186,7 +186,6 @@ func (t *Task) deliverSignal(info *linux.SignalInfo, act linux.SigAction) taskRu
 	switch sigact {
 	case SignalActionTerm, SignalActionCore:
 		// "Default action is to terminate the process." - signal(7)
-		t.Debugf("Signal %d: terminating thread group", info.Signo)
 
 		// Emit an event channel messages related to this uncaught signal.
 		ucs := &ucspb.UncaughtSignal{
@@ -202,6 +201,7 @@ func (t *Task) deliverSignal(info *linux.SignalInfo, act linux.SigAction) taskRu
 			ucs.FaultAddr = info.Addr()
 		}
 
+		t.Debugf("Signal %d, PID: %d, TID: %d, fault addr: %#x: terminating thread group", ucs.Pid, ucs.Tid, ucs.FaultAddr, info.Signo)
 		eventchannel.Emit(ucs)
 
 		t.PrepareGroupExit(linux.WaitStatusTerminationSignal(sig))

runsc/boot/BUILD

@@ -67,7 +67,6 @@ go_library(
         "//pkg/sentry/fsimpl/user",
         "//pkg/sentry/inet",
         "//pkg/sentry/kernel",
-        "//pkg/sentry/kernel:uncaught_signal_go_proto",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/limits",
         "//pkg/sentry/loader",

runsc/boot/compat.go

@@ -23,7 +23,6 @@ import (
 	"gvisor.dev/gvisor/pkg/eventchannel"
 	"gvisor.dev/gvisor/pkg/log"
 	rpb "gvisor.dev/gvisor/pkg/sentry/arch/registers_go_proto"
-	ucspb "gvisor.dev/gvisor/pkg/sentry/kernel/uncaught_signal_go_proto"
 	"gvisor.dev/gvisor/pkg/sentry/strace"
 	spb "gvisor.dev/gvisor/pkg/sentry/unimpl/unimplemented_syscall_go_proto"
 	"gvisor.dev/gvisor/pkg/sync"
@@ -76,8 +75,6 @@ func (c *compatEmitter) Emit(msg proto.Message) (bool, error) {
 	switch m := msg.(type) {
 	case *spb.UnimplementedSyscall:
 		c.emitUnimplementedSyscall(m)
-	case *ucspb.UncaughtSignal:
-		c.emitUncaughtSignal(m)
 	}
 
 	return false, nil
@@ -130,13 +127,6 @@ func (c *compatEmitter) emitUnimplementedSyscall(us *spb.UnimplementedSyscall) {
 	}
 }
 
-func (c *compatEmitter) emitUncaughtSignal(msg *ucspb.UncaughtSignal) {
-	sig := unix.Signal(msg.SignalNumber)
-	c.sink.Infof(
-		"Uncaught signal: %q (%d), PID: %d, TID: %d, fault addr: %#x",
-		sig, msg.SignalNumber, msg.Pid, msg.Tid, msg.FaultAddr)
-}
-
 // Close implements eventchannel.Emitter.
 func (c *compatEmitter) Close() error {
 	c.sink = nil