panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x889703]

goroutine 983007 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Credentials(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_identity.go:25 +0x53
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/fasync.(*FileAsync).Callback(0xc42103c270, 0xc42103c278)
	pkg/sentry/kernel/fasync/fasync.go:60 +0x119
gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify(0xc420bb7220, 0xffffffffffff0010)
	pkg/waiter/waiter.go:188 +0xe1
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/pipe.(*Writer).Release(0xc423bd8800)
	pkg/sentry/kernel/pipe/writer.go:31 +0x72
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef.func1()
	pkg/sentry/fs/file.go:123 +0xe2
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc4233f0bd0, 0xc423aff960)
	pkg/refs/refcounter.go:293 +0x198
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef(0xc4233f0bd0)
	pkg/sentry/fs/file.go:117 +0x7a
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Close(0xc423c1a900, 0x4, 0x722bc0, 0x0, 0x920160, 0x9200c0, 0x87583, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:690 +0x17e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc423c1a900, 0x3, 0x4, 0x722bc0, 0x0, 0x920160, 0x9200c0, 0x87583, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x14f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc423c1a900, 0x3, 0x4, 0x722bc0, 0x0, 0x920160, 0x9200c0, 0x87583, 0x4, 0x722bc0)
	pkg/sentry/kernel/task_syscall.go:278 +0x7e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc423c1a900, 0x3, 0x4, 0x722bc0, 0x0, 0x920160, 0x9200c0, 0x87583, 0xc423cdc760, 0xc423affc68)
	pkg/sentry/kernel/task_syscall.go:241 +0xc4
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc423c1a900, 0x2, 0xc42027dc20)
	pkg/sentry/kernel/task_syscall.go:216 +0x19d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc423c1a900, 0x10e4580, 0x0)
	pkg/sentry/kernel/task_run.go:217 +0x1502
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc423c1a900, 0x2b64)
	pkg/sentry/kernel/task_run.go:95 +0x265
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x194