panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6f63ef]

goroutine 4108857 [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(0xc000127650, 0xc000127658)
	pkg/sentry/kernel/fasync/fasync.go:61 +0x6d
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc0009e8140, 0xca0001)
	pkg/waiter/waiter.go:190 +0xa1
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/pipe.(*ReaderWriter).Write(0xc0004ee050, 0xcaef20, 0xc0057f2400, 0xc000b2a100, 0xcadc00, 0xc00305d200, 0x0, 0x1, 0x20000040, 0x8, ...)
	pkg/sentry/kernel/pipe/reader_writer.go:66 +0xf9
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc000b2a100, 0xcaef20, 0xc0057f2400, 0xcadc00, 0xc00305d200, 0x0, 0x1, 0x20000040, 0x8, 0x100, ...)
	pkg/sentry/fs/file.go:273 +0x172
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc0057f2400, 0xc000b2a100, 0xcadc00, 0xc00305d200, 0x0, 0x1, 0x20000040, 0x8, 0x100, 0x8, ...)
	pkg/sentry/syscalls/linux/sys_write.go:191 +0x8d
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write(0xc0057f2400, 0x0, 0x20000040, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_write.go:67 +0x23a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0057f2400, 0x1, 0x0, 0x20000040, 0x8, 0x0, 0x0, 0x0, 0xc001469380, 0xbd1b00, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x30a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0057f2400, 0x1, 0x0, 0x20000040, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:280 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0057f2400, 0x1, 0x0, 0x20000040, 0x8, 0x0, 0x0, 0x0, 0x100050001, 0x0)
	pkg/sentry/kernel/task_syscall.go:241 +0x99
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0057f2400, 0x2, 0xc0026bed80)
	pkg/sentry/kernel/task_syscall.go:216 +0x142
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0057f2400, 0xca1e60, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xfda
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc0057f2400, 0x5266)
	pkg/sentry/kernel/task_run.go:95 +0x163
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:275 +0xfe