panic: ptrace status unexpected: got 9, wanted stopped

goroutine 584 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000a42000, 0x0, 0xfc80)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000a42000, 0xc000da78c0, 0xc000da7a58, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000a42000, 0xc000a42010, 0xb, 0xc000da7a58, 0x2, 0x2, 0xb1e360, 0xeb1d3112b483451a, 0xc0003bf710)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0003267c0, 0xb, 0xc000da7a58, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc0003267c0, 0xa00000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc000a8cc80, 0xa00000, 0xc00000)
	pkg/sentry/mm/address_space.go:217 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc000a8cc80, 0xc000a8d2e8, 0x3, 0xa34000, 0xa35000, 0xa34000, 0xa35000, 0xc000a8d2e8, 0x3, 0xc000a8d2e8)
	pkg/sentry/mm/pma.go:449 +0x906
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc000a8cc80, 0xd09c00, 0xc000156a80, 0xc000a8ccf0, 0x4, 0xa34000, 0xa35000, 0x1, 0xc000a8ccf0, 0x5, ...)
	pkg/sentry/mm/pma.go:142 +0x2a1
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000a8cc80, 0xd09c00, 0xc000156a80, 0xa34d10, 0x101, 0x7fcabc325a80, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:56 +0x19d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000156a80, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000156a80, 0x62)
	pkg/sentry/kernel/task_run.go:95 +0x163
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe