panic: ptrace status unexpected: got 9, wanted stopped

goroutine 4986922 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc083d3b0e0, 0x0, 0x4c2b)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc083d3b0e0, 0xc08fb50ad0, 0xc08fb50c60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xc3
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc083d3b0e0, 0xc083d3b0f0, 0x9, 0xc08fb50c60, 0x6, 0x6, 0x8, 0xc082956be8, 0x7)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000567a80, 0x9, 0xc08fb50c60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc000567a80, 0x2b0137b2c000, 0xc, 0x2e0cc000, 0x2e0ec000, 0x101, 0x2b0137b4c000, 0x2b0137b4a000)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc00013bb00, 0xd1e340, 0xc000567a80, 0x2b0137b2c000, 0x2e0cc000, 0x2e0ec000, 0x101, 0x8, 0xc08fb50d90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc082956580, 0xc082956be8, 0x7, 0x2b0137b4a000, 0x2b0137b4b000, 0x2b0137b4a000, 0x2b0137b4b000, 0x1)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc082956580, 0xd1eca0, 0xc0933e8a80, 0x2b0137b4ac98, 0x101, 0x2b0137b4aca0, 0x0, 0x101)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0933e8a80, 0xd119c0, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0933e8a80, 0x7d88)
	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