panic: ptrace status unexpected: got 31, wanted stopped

goroutine 7822187 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0012e0ff0, 0x0, 0x78f1)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x38d
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0012e0ff0, 0xc0109c7cc8, 0xc0109c7e68, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0012e0ff0, 0xc0012e1000, 0xb, 0xc0109c7e68, 0x2, 0x2, 0x4, 0xc003cc9e10, 0xc003cc9e10)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0004b6000, 0xb, 0xc003cc9e68, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc0004b6000, 0x0, 0x7fffffff0000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x234
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).unmap(0xc0004b6000)
	pkg/sentry/platform/ptrace/subprocess.go:215 +0x40
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Release.func1(0xc0004b6000)
	pkg/sentry/platform/ptrace/subprocess.go:232 +0x2f
created by gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Release
	pkg/sentry/platform/ptrace/subprocess.go:231 +0x3f