panic: ptrace status unexpected: got 9, wanted stopped

goroutine 7753 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0008365a0, 0x0, 0x4abf)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0008365a0, 0xc0006eaad0, 0xc0006eac60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:408 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0008365a0, 0xc0008365b0, 0x9, 0xc0006eac60, 0x6, 0x6, 0x2, 0xc0001a3868, 0x1)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0002c63c0, 0x9, 0xc0006eac60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0002c63c0, 0x6c0000, 0xc, 0x1bd4000, 0x1bd7000, 0x1, 0x6c3000, 0xc0001a3270)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc00013bb00, 0xd1e2a0, 0xc0002c63c0, 0x6c0000, 0x1bd4000, 0x1bd7000, 0x1, 0x2, 0xc0006ead90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc0001a3200, 0xc0001a3868, 0x1, 0x6c2000, 0x6c3000, 0x6c2000, 0x6c3000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0001a3200, 0xd1ec00, 0xc0005b4a80, 0x6c2190, 0x1, 0x7fe8e012ea80, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0005b4a80, 0xd11960, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0005b4a80, 0x618)
	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