panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x86436d]

goroutine 1023936 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Credentials(0x0, 0x0)
	pkg/sentry/kernel/task_identity.go:27 +0x3d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/fasync.(*FileAsync).Callback(0xc4207f0c40, 0xc4207f0c48)
	pkg/sentry/kernel/fasync/fasync.go:60 +0xde
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc4208025c0, 0x1)
	pkg/waiter/waiter.go:190 +0xe1
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectedEndpoint).CloseNotify(0xc4203465e0)
	pkg/tcpip/transport/unix/unix.go:649 +0x74
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectionedEndpoint).Close(0xc420504cb0)
	pkg/tcpip/transport/unix/connectioned.go:217 +0x257
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef.func1()
	pkg/sentry/socket/unix/unix.go:75 +0x62
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc420d6e500, 0xc42092f618)
	pkg/refs/refcounter.go:297 +0x198
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef(0xc420d6e500)
	pkg/sentry/socket/unix/unix.go:74 +0x7a
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).Release(0xc420d6e500)
	pkg/sentry/socket/unix/unix.go:83 +0x39
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef.func1()
	pkg/sentry/fs/file.go:125 +0xe2
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc4216294d0, 0xc42092f710)
	pkg/refs/refcounter.go:297 +0x198
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc4216294d0)
	pkg/sentry/fs/file.go:119 +0x7a
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.releaseState(0xc42076ba40, 0x1, 0x1)
	pkg/sentry/syscalls/polling.go:72 +0xda
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll(0xc4239c8000, 0xc4215aa2e8, 0x1, 0x1, 0xffffffffff85ee00, 0xffffffffff85ee00, 0x0, 0x10b2420, 0xc4201304d0)
	pkg/sentry/syscalls/polling.go:117 +0x402
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.doPoll(0xc4239c8000, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0x40000002, 0x0, 0xe013, 0x0)
	pkg/sentry/syscalls/linux/sys_poll.go:70 +0x2b6
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.poll(0xc4239c8000, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0x46154c, 0x851a18, 0xc42026601c)
	pkg/sentry/syscalls/linux/sys_poll.go:291 +0x64
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Poll(0xc4239c8000, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x47c9be, 0xc42092fa88, 0x42f404, ...)
	pkg/sentry/syscalls/linux/sys_poll.go:309 +0x61
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc4239c8000, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x14f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc4239c8000, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x20b2c000, 0x46155c)
	pkg/sentry/kernel/task_syscall.go:280 +0x7e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc4239c8000, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0xc4207057e0, 0xc42092fc68)
	pkg/sentry/kernel/task_syscall.go:241 +0xc4
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc4239c8000, 0x2, 0xc4201b2a20)
	pkg/sentry/kernel/task_syscall.go:216 +0x19f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc4239c8000, 0x10b2b60, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0x1502
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc4239c8000, 0x2bac)
	pkg/sentry/kernel/task_run.go:95 +0x265
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x194