panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6e2e5f]

goroutine 85708 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Credentials(0x0, 0x0)
	pkg/sentry/kernel/task_identity.go:27 +0x2f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/fasync.(*FileAsync).Callback(0xc421250000, 0xc421250008)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x6f
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc420798680, 0xc421cd0001)
	pkg/waiter/waiter.go:190 +0x9c
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectedEndpoint).CloseNotify(0xc420236240)
	pkg/tcpip/transport/unix/unix.go:649 +0x39
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectionedEndpoint).Close(0xc420436460)
	pkg/tcpip/transport/unix/connectioned.go:217 +0x1b7
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef.func1()
	pkg/sentry/socket/unix/unix.go:75 +0x33
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc421cdf770, 0xc421177868)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef(0xc421cdf770)
	pkg/sentry/socket/unix/unix.go:74 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).Release(0xc421cdf770)
	pkg/sentry/socket/unix/unix.go:83 +0x2b
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef.func1()
	pkg/sentry/fs/file.go:125 +0x79
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc42050ea20, 0xc421177938)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc42050ea20)
	pkg/sentry/fs/file.go:119 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.releaseState(0xc421cdff90, 0x1, 0x1)
	pkg/sentry/syscalls/polling.go:72 +0x7c
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll(0xc421bd8d00, 0xc4218602a8, 0x1, 0x1, 0xffffffffff85ee00, 0xffffffffff85ee00, 0x0, 0xc45ee0, 0xc4200f64e0)
	pkg/sentry/syscalls/polling.go:117 +0x32c
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.doPoll(0xc421bd8d00, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0xc421bd8d00, 0x0, 0xffffff01, 0x920208)
	pkg/sentry/syscalls/linux/sys_poll.go:70 +0x15d
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.poll(0xc421bd8d00, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0xc42050e900, 0xc4211779c8, 0x2)
	pkg/sentry/syscalls/linux/sys_poll.go:291 +0x53
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Poll(0xc421bd8d00, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x0, 0xc421177c10, 0xffffffffffffffff, ...)
	pkg/sentry/syscalls/linux/sys_poll.go:309 +0x4f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc421bd8d00, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x4321bb, 0xb94e00, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc421bd8d00, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:280 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc421bd8d00, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x86b730, 0xc420a92818)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc421bd8d00, 0x2, 0xc4222e8480)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc421bd8d00, 0xc46620, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe56
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc421bd8d00, 0x292)
	pkg/sentry/kernel/task_run.go:95 +0x174
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x100