panic: ptrace status unexpected: got 9, wanted stopped

goroutine 8690837 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc003d5e2d0, 0x0, 0xf9d3)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc003d5e2d0, 0xc001f4f670, 0xc001f4f800, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:392 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc003d5e2d0, 0xc003d5e2e0, 0x9, 0xc001f4f800, 0x6, 0x6, 0xd, 0xc004bb2100, 0xc)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc004341380, 0x9, 0xc001f4f800, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc004341380, 0x2b95e0fad000, 0xb, 0x701ba000, 0x701db000, 0x2b9500000101, 0xc004bb2100, 0xd)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002c2000, 0xd09240, 0xc004341380, 0x2b95e0fad000, 0x701ba000, 0x701db000, 0x101, 0xd, 0xc001f4f930)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc001e36580, 0xc004bb2100, 0xc, 0x2b95e0fad000, 0x2b95e0fce000, 0x2b95e0fad000, 0x2b95e0fce000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).populateAndUnlock(0xc001e36580, 0xd09c00, 0xc003820000, 0xc0049f3800, 0xb, 0x2b95e0fad000, 0x2b95e0fce000, 0x0)
	pkg/sentry/mm/syscalls.go:196 +0x1fd
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MMap(0xc001e36580, 0xd09c00, 0xc003820000, 0x21000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/mm/syscalls.go:149 +0x2ce
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mmap(0xc003820000, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:101 +0x27e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc003820000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0x95ebe0, 0xc237c0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc003820000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0)
	pkg/sentry/kernel/task_syscall.go:280 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc003820000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xcfca00, 0xc001f4fe58)
	pkg/sentry/kernel/task_syscall.go:241 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc003820000, 0x2, 0xc004341380)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc003820000, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc003820000, 0x99ae)
	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