panic: ptrace status unexpected: got 9, wanted stopped

goroutine 1389231 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000d2db30, 0x0, 0x937e)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000d2db30, 0xc0017f58c0, 0xc0017f5a58, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000d2db30, 0xc000d2db40, 0xb, 0xc0017f5a58, 0x2, 0x2, 0xb1e360, 0xc347fdc07efa33d8, 0xc000a5e570)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc00023ac80, 0xb, 0xc0017f5a58, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc00023ac80, 0xa00000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc000fa0000, 0xa00000, 0xc00000)
	pkg/sentry/mm/address_space.go:217 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc000fa0000, 0xc000fa0668, 0x6, 0xa39000, 0xa3a000, 0xa39000, 0xa3a000, 0xc000fa0668, 0x6, 0xc000fa0668)
	pkg/sentry/mm/pma.go:449 +0x906
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc000fa0000, 0xd09c00, 0xc00154f500, 0xc000fa0070, 0x5, 0xa39000, 0xa3a000, 0x1, 0xc000fa0070, 0x6, ...)
	pkg/sentry/mm/pma.go:142 +0x2a1
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000fa0000, 0xd09c00, 0xc00154f500, 0xa39c78, 0x101, 0x7fbe397956f0, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:56 +0x19d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00154f500, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00154f500, 0x4d8a)
	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