panic: ptrace status unexpected: got 9, wanted stopped

goroutine 1586 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000141950, 0x0, 0x54f2)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000141950, 0xc0009738c0, 0xc0003f7a58, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000141950, 0xc000141960, 0xb, 0xc000973a58, 0x2, 0x2, 0xb2e820, 0xd5ef67239738b8c6, 0xc00043c510)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000664140, 0xb, 0xc0003f7a58, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc000664140, 0x600000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc000895900, 0x600000, 0x800000)
	pkg/sentry/mm/address_space.go:217 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc000895900, 0xc000895f68, 0x2, 0x6c9000, 0x6ca000, 0x6c9000, 0x6ca000, 0xc000895f68, 0x2, 0xc000895f68)
	pkg/sentry/mm/pma.go:449 +0x906
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc000895900, 0xd1ea40, 0xc0003fe000, 0xc000895970, 0x2, 0x6c9000, 0x6ca000, 0x1, 0xc000895970, 0x3, ...)
	pkg/sentry/mm/pma.go:142 +0x2a1
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000895900, 0xd1ea40, 0xc0003fe000, 0x6c9820, 0x101, 0x7fc4d216b810, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:56 +0x19d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0003fe000, 0xd11760, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0003fe000, 0x15a)
	pkg/sentry/kernel/task_run.go:91 +0x149
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe