panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x798 pc=0x9e6cab]

goroutine 1492851 [running]:
panic(0xef2c60, 0x1a1bb30)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc001899688 sp=0xc0018995d0 pc=0x43438d
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:695 +0x3da fp=0xc0018996b8 sp=0xc001899688 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(0xc0033f0600, 0x12244e0, 0x1a1d110)
	pkg/sentry/socket/netstack/netstack.go:507 +0x2eb fp=0xc001899788 sp=0xc0018996b8 pc=0x9e6cab
gvisor.dev/gvisor/pkg/sentry/fs.(*File).DecRef.func1(0x12244e0, 0x1a1d110)
	pkg/sentry/fs/file.go:152 +0xaa fp=0xc0018997e0 sp=0xc001899788 pc=0x6a350a
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc00314e8f0, 0x12244e0, 0x1a1d110, 0xc001899848)
	pkg/refs/refcounter.go:467 +0x17a fp=0xc001899828 sp=0xc0018997e0 pc=0x559bfa
gvisor.dev/gvisor/pkg/sentry/fs.(*File).DecRef(0xc00314e8f0, 0x12244e0, 0x1a1d110)
	pkg/sentry/fs/file.go:146 +0x73 fp=0xc001899878 sp=0xc001899828 pc=0x683e93
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).drop(0xc0030161e0, 0xc00314e8f0)
	pkg/sentry/kernel/fd_table.go:148 +0x121 fp=0xc0018998f8 sp=0xc001899878 pc=0x88f551
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).setAll(0xc0030161e0, 0x0, 0xc003371290, 0x0, 0xc004b1a000)
	pkg/sentry/kernel/fd_table_unsafe.go:155 +0x20a fp=0xc001899988 sp=0xc0018998f8 pc=0x89204a
gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).newFDAt(0xc0030161e0, 0x12246e0, 0xc003cb4000, 0xc000000000, 0xc003371290, 0x0, 0x2aeb2b7afc00, 0x0, 0x0)
	pkg/sentry/kernel/fd_table.go:442 +0x103 fp=0xc0018999e0 sp=0xc001899988 pc=0x890c43
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(0xc003cb4000, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:855 +0x128 fp=0xc001899a70 sp=0xc0018999e0 pc=0x91cd68
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Dup2(0xc003cb4000, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_file.go:836 +0x1c9 fp=0xc001899b08 sp=0xc001899a70 pc=0x91cbd9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc003cb4000, 0x21, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1055c40, ...)
	pkg/sentry/kernel/task_syscall.go:103 +0x122 fp=0xc001899c68 sp=0xc001899b08 pc=0x8ca622
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc003cb4000, 0x21, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:238 +0x66 fp=0xc001899cf0 sp=0xc001899c68 pc=0x8cb806
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc003cb4000, 0x21, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x11f6d01, 0x100000000000000)
	pkg/sentry/kernel/task_syscall.go:198 +0x96 fp=0xc001899d50 sp=0xc001899cf0 pc=0x8cb396
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc003cb4000, 0x2, 0xc003cb4000)
	pkg/sentry/kernel/task_syscall.go:173 +0x15c fp=0xc001899e10 sp=0xc001899d50 pc=0x8cad2c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc003cb4000, 0x11f6dc0, 0x0)
	pkg/sentry/kernel/task_run.go:275 +0xc18 fp=0xc001899f60 sp=0xc001899e10 pc=0x8bf6e8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc003cb4000, 0xb58e)
	pkg/sentry/kernel/task_run.go:93 +0x18b fp=0xc001899fd0 sp=0xc001899f60 pc=0x8be3bb
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc001899fd8 sp=0xc001899fd0 pc=0x467d61
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:318 +0xfe