b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
	b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
	b0.Event("GoDestroySyscall")
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEnd")

FAILURE ".*expected a proc but didn't have one.*"
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=34
GoCreateSyscall dt=1 new_g=4
ProcStatus dt=1 p=0 pstatus=2
ProcStart dt=1 p=0 p_seq=1
GoSyscallEndBlocked dt=1
GoStart dt=1 g=4 g_seq=1
GoSyscallBegin dt=1 p_seq=2 stack=0
GoDestroySyscall dt=1
GoCreateSyscall dt=1 new_g=4
GoSyscallEnd dt=1
GoSyscallBegin dt=1 p_seq=3 stack=0
GoDestroySyscall dt=1

-- expect --
SUCCESS
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=37
GoCreateSyscall dt=1 new_g=4
GoSyscallEndBlocked dt=1
ProcStatus dt=1 p=0 pstatus=2
ProcStart dt=1 p=0 p_seq=1
GoStatus dt=1 g=4 m=18446744073709551615 gstatus=1
GoStart dt=1 g=4 g_seq=1
GoSyscallBegin dt=1 p_seq=2 stack=0
GoDestroySyscall dt=1
EventBatch gen=1 m=0 time=0 size=13
ProcStatus dt=1 p=1 pstatus=2
ProcStart dt=1 p=1 p_seq=1

}

func gen(t *testgen.Trace) {
	g := t.Generation(1)

	// A C thread calls into Go and acquires a P. It returns
	// back to C, destroying the G.
	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))

		Name:         "GoCreate",
		Args:         []string{"dt", "new_g", "new_stack", "stack"},
		IsTimedEvent: true,
		StackIDs:     []int{3, 2},
	},
	EvGoCreateSyscall: event.Spec{
		Name:         "GoCreateSyscall",
		Args:         []string{"dt", "new_g"},
		IsTimedEvent: true,
	},
	EvGoStart: event.Spec{
		Name:         "GoStart",
		Args:         []string{"dt", "g", "g_seq"},
		IsTimedEvent: true,
	},

}

// GoCreateSyscall indicates that a goroutine has transitioned from dead to GoSyscall.
//
// Unlike GoCreate, the caller must be running on gp.
//
// This occurs when C code calls into Go. On pthread platforms it occurs only when
// a C thread calls into Go code for the first time.
func (tl traceLocker) GoCreateSyscall(gp *g) {

	// really confused if we try to steal the P is this is running
	// with later. The new M with the same ID could even try to
	// steal back this P from itself!
	//
	// The runtime is careful to make sure that any GoCreateSyscall
	// event will enter the runtime emitting events for reacquiring a P.
	//
	// Note: we might have a P here. The P might not be released
	// eagerly by the runtime, and it might get stolen back later

		trace = traceAcquire()
	}

	// mp.curg is now a real goroutine.
	casgstatus(mp.curg, _Gdead, _Gsyscall)
	sched.ngsys.Add(-1)

	if !signal {
		if trace.ok() {
			trace.GoCreateSyscall(mp.curg)
			traceRelease(trace)
		}
	}
	mp.isExtraInSig = signal
}

// Acquire an extra m and bind it to the C thread when a pthread key has been created.
//
//go:nosplit