panic: ptrace status unexpected: got 9, wanted stopped

goroutine 492 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000dbea50, 0x0, 0xaf27)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000dbea50, 0xc00054b818, 0xc00054ba90, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x184
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000dbea50, 0xc000dbea60, 0x9, 0xc00054ba90, 0x6, 0x6, 0x81562c, 0xc000981f68, 0x3)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0x106
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0007b8040, 0x9, 0xc00054ba90, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xf6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0007b8040, 0x6f6000, 0xb, 0xe002000, 0xe02c000, 0x101, 0x2, 0x45d2c2)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc000159b00, 0x11db840, 0xc0007b8040, 0x6f6000, 0xe002000, 0xe02c000, 0x101, 0xc0007ffc80, 0xc000981f50)
	pkg/sentry/platform/filemem/filemem.go:512 +0x11d
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc000981900, 0xc000981f68, 0x2, 0x718000, 0x719000, 0x718000, 0x719000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x38b
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000981900, 0x11dc260, 0xc000734a80, 0x718008, 0x1, 0x7f4906719ae0, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x295
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000734a80, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x987
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000734a80, 0x63)
	pkg/sentry/kernel/task_run.go:95 +0x27a
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0x19e