panic: ptrace status unexpected: got 9, wanted stopped

goroutine 6159162 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc003ef94a0, 0x0, 0xaf94)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc003ef94a0, 0xc003b8b820, 0xc003b8b9b8, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:392 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc003ef94a0, 0xc003ef94b0, 0xb, 0xc003b8b9b8, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0004de540, 0xb, 0xc003b8b9b8, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc0004de540, 0x2aef4047e000, 0x1000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc003f38580, 0x2aef4047e000, 0x2aef4047f000)
	pkg/sentry/mm/address_space.go:217 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MProtect(0xc003f38580, 0x2aef4047e000, 0x1000, 0x0, 0x0, 0x0)
	pkg/sentry/mm/syscalls.go:580 +0x446
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mprotect(0xc001f3e000, 0x2aef4047e000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0xc003b8bc68, 0x202, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:148 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc001f3e000, 0xa, 0x2aef4047e000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x95ebe0, 0xc237c0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc001f3e000, 0xa, 0x2aef4047e000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:280 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001f3e000, 0xa, 0x2aef4047e000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0xcfca00, 0xc003b8be58)
	pkg/sentry/kernel/task_syscall.go:241 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc001f3e000, 0x2, 0xc0004de540)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc001f3e000, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc001f3e000, 0x50db)
	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