panic: ptrace status unexpected: got 9, wanted stopped

goroutine 311262 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc4204dc0d0, 0x18)
	pkg/sentry/platform/ptrace/subprocess.go:304 +0x1e6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc4204dc0d0, 0xc420b69a78, 0xc420895c08, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:363 +0x119
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc4204dc0d0, 0xc420238900, 0x9, 0xc420b69c08, 0x6, 0x6, 0xc420133868, 0x0, 0xc420895c58)
	pkg/sentry/platform/ptrace/subprocess.go:383 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc420238900, 0x9, 0xc420895c08, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:510 +0xe2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc420238900, 0x400000, 0x8, 0x7e7e000, 0x7f5a000, 0x10001, 0x4dc000, 0xc420133270)
	pkg/sentry/platform/ptrace/subprocess.go:519 +0xf0
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc42029a000, 0xc7e460, 0xc420238900, 0x400000, 0x7e7e000, 0x7f5a000, 0x10001, 0x0, 0xc420895d38)
	pkg/sentry/platform/filemem/filemem.go:460 +0xf1
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc420133200, 0xc420133868, 0x0, 0x454000, 0x455000, 0x454000, 0x455000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x185
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc420133200, 0xc7ee20, 0xc42067ad00, 0x45418b, 0xc420010001, 0x7f06b64e6dd0, 0xc4206a0540, 0x10001)
	pkg/sentry/mm/syscalls.go:69 +0x27c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc42067ad00, 0xc71f00, 0x0)
	pkg/sentry/kernel/task_run.go:235 +0x845
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42067ad00, 0x2390)
	pkg/sentry/kernel/task_run.go:95 +0x174
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x100