g := t.Generation(1)

	// Steal proc from a goroutine that's been blocked
	// in a syscall the entire generation.
	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b0.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(1))

	// Status event for a goroutine blocked in a syscall for the entire generation.
	bz := g.Batch(trace.NoThread, 0)

	b0.Event("GoSyscallEndBlocked")

	// A bare M stole the goroutine's P at the generation boundary.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))

	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
	b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))

	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
	b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))

	b0.Event("GoSyscallEndBlocked")

	// A bare M stole the goroutine's P at the generation boundary.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))

		} else if status == go122.ProcSyscallAbandoned && s.status == go122.ProcSyscallAbandoned {
			// If we're passing through ProcSyscallAbandoned, then there's no promotion
			// to do. We've lost the M that this P is associated with. However it got there,
			// it's going to appear as idle in the API, so pass through as idle.
			oldState = ProcIdle
			ev.args[1] = uint64(go122.ProcSyscallAbandoned)
		} else if s.status != status {

		return "Syscall"
	case GoWaiting:
		return "Waiting"
	}
	return "Bad"
}

type ProcStatus uint8

const (
	ProcBad ProcStatus = iota
	ProcRunning
	ProcIdle
	ProcSyscall
	ProcSyscallAbandoned
)

func (s ProcStatus) String() string {
	switch s {
	case ProcRunning:
		return "Running"
	case ProcIdle:
		return "Idle"
	case ProcSyscall:
		return "Syscall"
	}
	return "Bad"

	case go122.EvProcSteal:
		// N.B. ordering.advance populates e.base.extra.
		beforeState := ProcRunning
		if go122.ProcStatus(e.base.extra(version.Go122)[0]) == go122.ProcSyscallAbandoned {
			// We've lost information because this ProcSteal advanced on a
			// SyscallAbandoned state. Treat the P as idle because ProcStatus
			// treats SyscallAbandoned as Idle. Otherwise we'll have an invalid