panic: ptrace status unexpected: got 31, wanted stopped

goroutine 4756734 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0022a2f00, 0x0, 0x8aae)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0022a2f00, 0xc0020f7660, 0xc0020f77f0, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0022a2f00, 0xc0022a2f10, 0x9, 0xc0020f77f0, 0x6, 0x6, 0xc0008f7180, 0x6, 0xc0020f7838)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0009b8740, 0x9, 0xc0020f77f0, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0009b8740, 0x2b2386f3c000, 0xc, 0x19fc1000, 0x19fe2000, 0xc000000101, 0x7, 0xc0008f7180)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002b2000, 0xd21fc0, 0xc0009b8740, 0x2b2386f3c000, 0x19fc1000, 0x19fe2000, 0x101, 0xc0020f7918, 0x68fc11)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc00047d100, 0xc0008f7180, 0x6, 0x2b2386f3c000, 0x2b2386f5d000, 0x2b2386f3c000, 0x2b2386f5d000, 0x0)
	pkg/sentry/mm/address_space.go:186 +0x1aa
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).populateVMAAndUnlock(0xc00047d100, 0xd224a0, 0xc00282c000, 0xc00047d170, 0xd, 0x2b2386f3c000, 0x2b2386f5d000, 0x0)
	pkg/sentry/mm/syscalls.go:242 +0x1fa
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).MMap(0xc00047d100, 0xd224a0, 0xc00282c000, 0x21000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/mm/syscalls.go:158 +0x32d
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Mmap(0xc00282c000, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_mmap.go:104 +0x265
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00282c000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0x0, 0xc39b20, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00282c000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00282c000, 0x9, 0x0, 0x21000, 0x3, 0x20022, 0xffffffffffffffff, 0x0, 0xd15680, 0xc0020f7e58)
	pkg/sentry/kernel/task_syscall.go:244 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00282c000, 0x2, 0xc0009b8740)
	pkg/sentry/kernel/task_syscall.go:219 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00282c000, 0xd15680, 0x0)
	pkg/sentry/kernel/task_run.go:215 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00282c000, 0x35d7)
	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