panic: ptrace status unexpected: got 9, wanted stopped

goroutine 820473 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0020e53b0, 0x0, 0x4e5e)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0020e53b0, 0xc0019e1ad0, 0xc0019e1c60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:408 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0020e53b0, 0xc0020e53c0, 0x9, 0xc0019e1c60, 0x6, 0x6, 0x3, 0xc0019b4be8, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000349380, 0x9, 0xc0019e1c60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc000349380, 0x6f6000, 0xc, 0xe421000, 0xe44b000, 0x1, 0x720000, 0xc0019b45f0)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc00014bb00, 0xd1e0e0, 0xc000349380, 0x6f6000, 0xe421000, 0xe44b000, 0x1, 0x3, 0xc0019e1d90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc0019b4580, 0xc0019b4be8, 0x2, 0x71b000, 0x71c000, 0x71b000, 0x71c000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0019b4580, 0xd1ea40, 0xc00175ea80, 0x71bf04, 0x1, 0x7fe16c39c8e0, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00175ea80, 0xd11760, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00175ea80, 0x1c2f)
	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