panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x798 pc=0x9e6e3b]

goroutine 43519 [running]:
panic(0xef2ca0, 0x1a1bb30)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc000731720 sp=0xc000731668 pc=0x43438d
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:695 +0x3da fp=0xc000731750 sp=0xc000731720 pc=0x44b8fa
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Kernel(...)
	pkg/sentry/kernel/task.go:641
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).Release(0xc000912100, 0x12245a0, 0x1a1d110)
	pkg/sentry/socket/netstack/netstack.go:507 +0x2eb fp=0xc000731820 sp=0xc000731750 pc=0x9e6e3b
gvisor.dev/gvisor/pkg/sentry/fs.(*File).DecRef.func1(0x12245a0, 0x1a1d110)
	pkg/sentry/fs/file.go:152 +0xaa fp=0xc000731878 sp=0xc000731820 pc=0x6a350a
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc00129ef20, 0x12245a0, 0x1a1d110, 0xc0007318e0)
	pkg/refs/refcounter.go:467 +0x17a fp=0xc0007318c0 sp=0xc000731878 pc=0x559bfa
gvisor.dev/gvisor/pkg/sentry/fs.(*File).DecRef(0xc00129ef20, 0x12245a0, 0x1a1d110)
	pkg/sentry/fs/file.go:146 +0x73 fp=0xc000731910 sp=0xc0007318c0 pc=0x683e93
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).drop(0xc00031dd40, 0xc00129ef20)
	pkg/sentry/kernel/fd_table.go:148 +0x121 fp=0xc000731990 sp=0xc000731910 pc=0x88f6e1
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).setAll(0xc00031dd40, 0x4, 0xc00129edc0, 0x0, 0xc000426800)
	pkg/sentry/kernel/fd_table_unsafe.go:155 +0x20a fp=0xc000731a20 sp=0xc000731990 pc=0x8921da
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).newFDAt(0xc00031dd40, 0x12247a0, 0xc000cfc000, 0x4, 0xc00129edc0, 0x0, 0x43dd00, 0x0, 0x0)
	pkg/sentry/kernel/fd_table.go:442 +0x103 fp=0xc000731a78 sp=0xc000731a20 pc=0x890dd3
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).NewFDAt(...)
	pkg/sentry/kernel/fd_table.go:416
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).NewFDAt(...)
	pkg/sentry/kernel/task.go:841
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Dup3(0xc000cfc000, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:855 +0x128 fp=0xc000731b08 sp=0xc000731a78 pc=0x91cef8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000cfc000, 0x124, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1055cc0, ...)
	pkg/sentry/kernel/task_syscall.go:103 +0x122 fp=0xc000731c68 sp=0xc000731b08 pc=0x8ca7b2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000cfc000, 0x124, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:238 +0x66 fp=0xc000731cf0 sp=0xc000731c68 pc=0x8cb996
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000cfc000, 0x124, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0, 0x11f6e01, 0x100000000000000)
	pkg/sentry/kernel/task_syscall.go:198 +0x96 fp=0xc000731d50 sp=0xc000731cf0 pc=0x8cb526
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000cfc000, 0x2, 0xc000cfc000)
	pkg/sentry/kernel/task_syscall.go:173 +0x15c fp=0xc000731e10 sp=0xc000731d50 pc=0x8caebc
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000cfc000, 0x11f6e80, 0x0)
	pkg/sentry/kernel/task_run.go:275 +0xc18 fp=0xc000731f60 sp=0xc000731e10 pc=0x8bf878
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000cfc000, 0x4fd)
	pkg/sentry/kernel/task_run.go:93 +0x18b fp=0xc000731fd0 sp=0xc000731f60 pc=0x8be54b
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc000731fd8 sp=0xc000731fd0 pc=0x467d61
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:318 +0xfe