panic: ptrace status unexpected: got 9, wanted stopped

goroutine 84277 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc000c47950, 0x0, 0xbe35)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc000c47950, 0xc000801818, 0xc000801a90, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:392 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc000c47950, 0xc000c47960, 0x9, 0xc000801a90, 0x6, 0x6, 0x10000000081562c, 0x5, 0x5)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0x106
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0007a40c0, 0x9, 0xc000801a90, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xf6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0007a40c0, 0xa39000, 0xb, 0xcc98000, 0xccb9000, 0x101, 0x5, 0x45d2c2)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc000153b00, 0x11db840, 0xc0007a40c0, 0xa39000, 0xcc98000, 0xccb9000, 0x101, 0xc00116bb00, 0xc000843f50)
	pkg/sentry/platform/filemem/filemem.go:512 +0x11d
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc000843900, 0xc000843f68, 0x5, 0xa39000, 0xa3a000, 0xa39000, 0xa3a000, 0x1)
	pkg/sentry/mm/address_space.go:184 +0x38b
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000843900, 0x11dc260, 0xc00123b500, 0xa39c78, 0x101, 0x7fdc241746f0, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:70 +0x295
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00123b500, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x987
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc00123b500, 0x446)
	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