panic: ptrace status unexpected: got 9, wanted stopped

goroutine 4449885 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0031552c0, 0x0, 0xd262)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x521
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0031552c0, 0xc003445818, 0xc003445a90, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:392 +0x113
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0031552c0, 0xc0031552d0, 0x9, 0xc003445a90, 0x6, 0x6, 0x81562c, 0xc001e812e8, 0x3)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0x106
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc00397a000, 0x9, 0xc003445a90, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xf6
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc00397a000, 0x6f6000, 0xb, 0xcfb0000, 0xcfda000, 0x1, 0x2, 0x45d2c2)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc0002cc000, 0x11db840, 0xc00397a000, 0x6f6000, 0xcfb0000, 0xcfda000, 0x1, 0xc000b08300, 0xc001e812d0)
	pkg/sentry/platform/filemem/filemem.go:512 +0x11d
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc001e80c80, 0xc001e812e8, 0x2, 0x71b000, 0x71c000, 0x71b000, 0x71c000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x38b
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc001e80c80, 0x11dc260, 0xc0017c0000, 0x71bf04, 0x1, 0x7fcf347aa8e0, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x295
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0017c0000, 0x11cd860, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x987
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0017c0000, 0x8cb2)
	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