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

goroutine 3196376 [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(0xc421c4a620, 0xc421c4a628)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x6f
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc421299c88, 0x1)
	pkg/waiter/waiter.go:190 +0x9c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/eventfd.(*EventOperations).Signal(0xc421299c80, 0x400017100000018, 0x0, 0x0)
	pkg/sentry/kernel/eventfd/eventfd.go:235 +0xc9
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/eventfd.(*EventOperations).write(0xc421299c80, 0xc68dc0, 0xc422092400, 0xc67aa0, 0xc420a8a580, 0x0, 0x1, 0x20000e00, 0x18, 0x100, ...)
	pkg/sentry/kernel/eventfd/eventfd.go:208 +0xf8
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/eventfd.(*EventOperations).Write(0xc421299c80, 0xc68dc0, 0xc422092400, 0xc421e994d0, 0xc67aa0, 0xc420a8a580, 0x0, 0x1, 0x20000e00, 0x18, ...)
	pkg/sentry/kernel/eventfd/eventfd.go:131 +0xc6
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc421e994d0, 0xc68dc0, 0xc422092400, 0xc67aa0, 0xc420a8a580, 0x0, 0x1, 0x20000e00, 0x18, 0x100, ...)
	pkg/sentry/fs/file.go:273 +0x170
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc422092400, 0xc421e994d0, 0xc67aa0, 0xc420a8a580, 0x0, 0x1, 0x20000e00, 0x18, 0x100, 0x18, ...)
	pkg/sentry/syscalls/linux/sys_write.go:191 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write(0xc422092400, 0x5, 0x20000e00, 0x18, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_write.go:67 +0x21e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc422092400, 0x1, 0x5, 0x20000e00, 0x18, 0x0, 0x0, 0x0, 0x0, 0xba7ee0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc422092400, 0x1, 0x5, 0x20000e00, 0x18, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:280 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc422092400, 0x1, 0x5, 0x20000e00, 0x18, 0x0, 0x0, 0x0, 0xc5bbc0, 0x0)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc422092400, 0x2, 0xc42172c000)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc422092400, 0xc5bbc0, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe56
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc422092400, 0x323a)
	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