panic: ptrace status unexpected: got 9, wanted stopped

goroutine 3407752 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0013b8780, 0x0, 0x521a)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0013b8780, 0xc0003b8ad0, 0xc0003b8c60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:408 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0013b8780, 0xc0013b8790, 0x9, 0xc0003b8c60, 0x6, 0x6, 0x7, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc123340300, 0x9, 0xc0003b8c60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc123340300, 0x7fb7f3800000, 0xc, 0x24f9e000, 0x25018000, 0x101, 0x7fb7f387a000, 0x7fb7f3879000)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002c4000, 0xd1e0e0, 0xc123340300, 0x7fb7f3800000, 0x24f9e000, 0x25018000, 0x101, 0x7, 0xc0003b8d90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc001296c80, 0xc0012972e8, 0x6, 0x7fb7f3879000, 0x7fb7f387a000, 0x7fb7f3879000, 0x7fb7f387a000, 0x1)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc001296c80, 0xd1ea40, 0xc001078a80, 0x7fb7f3879a78, 0x101, 0x7fb7f3879a80, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc001078a80, 0xd11760, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc001078a80, 0x8755)
	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