panic: ptrace status unexpected: got 9, wanted stopped

goroutine 139 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000c543c0, 0x0, 0x4512)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000c543c0, 0xc00087f5d0, 0xc00087f850, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000c543c0, 0xc000c543d0, 0xb, 0xc00087f850, 0x2, 0x2, 0x47aa59, 0xc0006be728, 0xc0ffffffff)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0x106
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0006be700, 0xb, 0xc00087f850, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xf6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc0006be700, 0x7fe01d400000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x2d2
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc0006a4000, 0x7fe01d400000, 0x7fe01d600000)
	pkg/sentry/mm/address_space.go:217 +0xf5
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc0006a4000, 0xc0006a4668, 0x5, 0x7fe01d44e000, 0x7fe01d44f000, 0x7fe01d44e000, 0x7fe01d44f000, 0xc0006a4668, 0x5, 0xc0006a4668)
	pkg/sentry/mm/pma.go:449 +0xd51
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc0006a4000, 0x11fc640, 0xc0005d5500, 0xc0006a4070, 0xa, 0x7fe01d44e000, 0x7fe01d44f000, 0x1, 0xc0006a4070, 0xb, ...)
	pkg/sentry/mm/pma.go:142 +0x35a
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0006a4000, 0x11fc640, 0xc0005d5500, 0x7fe01d44ead8, 0x101, 0x7fe01d44eae0, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:56 +0x1ae
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0005d5500, 0x11edba0, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x987
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0005d5500, 0x4c)
	pkg/sentry/kernel/task_run.go:91 +0x24c
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0x19e