panic: ptrace status unexpected: got 31, wanted stopped

goroutine 607214 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc00092dc20, 0x0, 0x24d0)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc00092dc20, 0xc000743660, 0xc0007437f0, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc00092dc20, 0xc00092dc30, 0x9, 0xc0007437f0, 0x6, 0x6, 0xc000810c00, 0x6, 0xc000743838)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0001562c0, 0x9, 0xc0007437f0, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
DIAGNOSIS: