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

goroutine 550993 [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(0xc42044c3f0, 0xc42044c3f8)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x6f
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc420a3c180, 0xc421bd0004)
	pkg/waiter/waiter.go:190 +0x9c
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectedEndpoint).CloseNotify(0xc42060ce20)
	pkg/tcpip/transport/unix/unix.go:650 +0x56
gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix.(*connectionedEndpoint).Close(0xc42014e070)
	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(0xc421bde280, 0xc4219d9a20)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).DecRef(0xc421bde280)
	pkg/sentry/socket/unix/unix.go:74 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix.(*SocketOperations).Release(0xc421bde280)
	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(0xc4204675f0, 0xc4219d9af0)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc4204675f0)
	pkg/sentry/fs/file.go:119 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Close(0xc420b3fb00, 0x5, 0x7206c8, 0x0, 0x9203e0, 0x9200c0, 0xa05a1, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:692 +0x14e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc420b3fb00, 0x3, 0x5, 0x7206c8, 0x0, 0x9203e0, 0x9200c0, 0xa05a1, 0x4321bb, 0xb94e00, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc420b3fb00, 0x3, 0x5, 0x7206c8, 0x0, 0x9203e0, 0x9200c0, 0xa05a1, 0x9200c0, 0xa05a1)
	pkg/sentry/kernel/task_syscall.go:280 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc420b3fb00, 0x3, 0x5, 0x7206c8, 0x0, 0x9203e0, 0x9200c0, 0xa05a1, 0x86b730, 0xc42159a968)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc420b3fb00, 0x2, 0xc4212c4900)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc420b3fb00, 0xc46620, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe56
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc420b3fb00, 0x121b)
	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