panic: ptrace status unexpected: got 9, wanted stopped

goroutine 618861 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000960870, 0x0, 0xd4c6)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000960870, 0xc00066f818, 0xc001453a90, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:392 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000960870, 0xc000960880, 0x9, 0xc00066fa90, 0x6, 0x6, 0x81562c, 0xc0013fe668, 0x4)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0x106
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0001045c0, 0x9, 0xc001453a90, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xf6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0001045c0, 0xa00000, 0xb, 0xc525000, 0xc55c000, 0x1, 0x3, 0x45d2c2)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002c6000, 0x11db840, 0xc0001045c0, 0xa00000, 0xc525000, 0xc55c000, 0x1, 0xc000b9f380, 0xc0013fe650)
	pkg/sentry/platform/filemem/filemem.go:512 +0x11d
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc0013fe000, 0xc0013fe668, 0x3, 0xa35000, 0xa36000, 0xa35000, 0xa36000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x38b
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0013fe000, 0x11dc260, 0xc00106ca80, 0xa35f68, 0x1, 0x7f80b3672a80, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x295
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00106ca80, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x987
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00106ca80, 0x2260)
	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