panic: ptrace status unexpected: got 9, wanted stopped

goroutine 987218 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0015403c0, 0x0, 0x55f0)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0015403c0, 0xc000ee1820, 0xc000ee19b8, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0015403c0, 0xc0015403d0, 0xb, 0xc000ee19b8, 0x2, 0x2, 0xb1e360, 0xc000ee1960, 0xc001651080)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000344ac0, 0xb, 0xc000ee19b8, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc000344ac0, 0x2b027d490000, 0x1000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x22e
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc00158e580, 0x2b027d490000, 0x2b027d491000)
	pkg/sentry/mm/address_space.go:217 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MProtect(0xc00158e580, 0x2b027d490000, 0x1000, 0x0, 0x0, 0x0)
	pkg/sentry/mm/syscalls.go:580 +0x446
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mprotect(0xc00120d500, 0x2b027d490000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0xc000ee1c68, 0x202, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:148 +0x73
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00120d500, 0xa, 0x2b027d490000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x95ebe0, 0xc237c0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00120d500, 0xa, 0x2b027d490000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:280 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00120d500, 0xa, 0x2b027d490000, 0x1000, 0x0, 0x20022, 0x1, 0x1, 0xcfca00, 0xc000ee1e58)
	pkg/sentry/kernel/task_syscall.go:241 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00120d500, 0x2, 0xc000344ac0)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00120d500, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00120d500, 0x2cf9)
	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