panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6e385f]

goroutine 1047401 [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(0xc420fb2000, 0xc420fb2008)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x6f
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc420016780, 0xc420ea0001)
	pkg/waiter/waiter.go:190 +0x9c
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectedEndpoint).CloseNotify(0xc420472d40)
	pkg/tcpip/transport/unix/unix.go:653 +0x39
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectionedEndpoint).Close(0xc420336620)
	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(0xc420ea9360, 0xc4211e8868)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef(0xc420ea9360)
	pkg/sentry/socket/unix/unix.go:74 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).Release(0xc420ea9360)
	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(0xc420ff0d80, 0xc4211e8938)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc420ff0d80)
	pkg/sentry/fs/file.go:119 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.releaseState(0xc4215988c0, 0x1, 0x1)
	pkg/sentry/syscalls/polling.go:72 +0x7c
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll(0xc42154db00, 0xc4211845b8, 0x1, 0x1, 0xffffffffff85ee00, 0xffffffffff85ee00, 0x0, 0xc4b3e0, 0xc4200f64e0)
	pkg/sentry/syscalls/polling.go:117 +0x32c
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.doPoll(0xc42154db00, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0xc4211e8b3c, 0xc4211e8b40, 0x474011, 0xf7a5)
	pkg/sentry/syscalls/linux/sys_poll.go:70 +0x15d
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.poll(0xc42154db00, 0x20b2c000, 0x1, 0xffffffffff85ee00, 0xc4211e8b88, 0x40000002, 0x0)
	pkg/sentry/syscalls/linux/sys_poll.go:291 +0x53
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Poll(0xc42154db00, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x202, 0xc4211e8c10, 0x428854, ...)
	pkg/sentry/syscalls/linux/sys_poll.go:309 +0x4f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc42154db00, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0x0, 0xb99c40, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc42154db00, 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(0xc42154db00, 0x7, 0x20b2c000, 0x1, 0xfffffffffffffff8, 0x0, 0x0, 0x0, 0xc4bb40, 0x0)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc42154db00, 0x2, 0xc420229d40)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc42154db00, 0xc4bb40, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe56
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42154db00, 0x19d3)
	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