panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6e6eef]

goroutine 5925462 [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(0xc420da5490, 0xc420da5498)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x6f
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc422640aa0, 0xffffffffffff0010)
	pkg/waiter/waiter.go:190 +0x9c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/pipe.(*Writer).Release(0xc4254b6cb0)
	pkg/sentry/kernel/pipe/writer.go:33 +0x48
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(0xc42576b4d0, 0xc4256a5af0)
	pkg/refs/refcounter.go:297 +0x121
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc42576b4d0)
	pkg/sentry/fs/file.go:119 +0x48
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Close(0xc421646000, 0x4, 0x7204c8, 0x0, 0x7fab8c8cca20, 0x12967c, 0x12967c, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:696 +0x14e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc421646000, 0x3, 0x4, 0x7204c8, 0x0, 0x7fab8c8cca20, 0x12967c, 0x12967c, 0x0, 0xba7ee0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc421646000, 0x3, 0x4, 0x7204c8, 0x0, 0x7fab8c8cca20, 0x12967c, 0x12967c, 0x12967c, 0x12967c)
	pkg/sentry/kernel/task_syscall.go:280 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc421646000, 0x3, 0x4, 0x7204c8, 0x0, 0x7fab8c8cca20, 0x12967c, 0x12967c, 0xc5bbc0, 0x0)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc421646000, 0x2, 0xc4217587e0)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc421646000, 0xc5bbc0, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe56
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc421646000, 0x5c91)
	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