panic: ptrace status unexpected: got 9, wanted stopped

goroutine 5319079 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc0aaf082d0, 0x0, 0xc205)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc0aaf082d0, 0xc0bf5a3ad0, 0xc0bf5a3c60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc0aaf082d0, 0xc0aaf082e0, 0x9, 0xc0bf5a3c60, 0x6, 0x6, 0x5, 0xc0c0246668, 0x4)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0ac49b000, 0x9, 0xc0bf5a3c60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0ac49b000, 0x7fe759800000, 0xb, 0x2c47e000, 0x2c67b000, 0x1, 0x7fe7599fd000, 0xc0c0246070)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc000290000, 0xd09240, 0xc0ac49b000, 0x7fe759800000, 0x2c47e000, 0x2c67b000, 0x1, 0x5, 0xc0bf5a3d90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc0c0246000, 0xc0c0246668, 0x4, 0x7fe7599fc000, 0x7fe7599fd000, 0x7fe7599fc000, 0x7fe7599fd000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0c0246000, 0xd09c00, 0xc0b8676000, 0x7fe7599fca78, 0x1, 0x7fe7599fca80, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0b8676000, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0b8676000, 0x1933)
	pkg/sentry/kernel/task_run.go:95 +0x163
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe