panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x17689d3]

goroutine 604311 [running]:
panic({0x305940?, 0x25d0c60?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc0040ce288 sp=0xc0040ce1d8 pc=0x11ad0ec
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:261
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:861 +0x378 fp=0xc0040ce2e8 sp=0xc0040ce288 pc=0x11c60f8
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x0)
	pkg/sentry/vfs/mount.go:693 +0x33 fp=0xc0040ce308 sp=0xc0040ce2e8 pc=0x17689d3
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d2a00, 0x0)
	pkg/sentry/vfs/namespace.go:143 +0x385 fp=0xc0040ce418 sp=0xc0040ce308 pc=0x1770d45
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d21e0, 0xc0008d37c0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ce528 sp=0xc0040ce418 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d2e60, 0xc0008d3860)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ce638 sp=0xc0040ce528 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d30e0, 0xc0008d3720)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ce748 sp=0xc0040ce638 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d3360, 0xc0008d3540)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ce858 sp=0xc0040ce748 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d32c0, 0xc0008d34a0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ce968 sp=0xc0040ce858 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d35e0, 0xc0008d3220)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040cea78 sp=0xc0040ce968 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d3900, 0xc0008d3040)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040ceb88 sp=0xc0040cea78 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc006fbf810, 0xc006fbf820, 0xc0008d2000, 0xc0008d2f00)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc0040cec98 sp=0xc0040ceb88 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc00017e1e0, {0x6fec98, 0xc000f50000}, 0xc000ab1b60, 0xc000a37260, 0xc000426050?, 0xc00322ee48?, {0x6e27c0, 0xc00017e000})
	pkg/sentry/vfs/namespace.go:186 +0x4e8 fp=0xc0040cede0 sp=0xc0040cec98 pc=0x17713a8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Clone(0xc000f50000, 0xc0040cf368)
	pkg/sentry/kernel/task_clone.go:205 +0x1b05 fp=0xc0040cf348 sp=0xc0040cede0 pc=0x1ab8b65
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.clone(0x11e7c8c?, 0xffffffffc0920400, 0x1000000, 0x0, 0x0, 0x0)
	pkg/sentry/syscalls/linux/sys_thread.go:215 +0x145 fp=0xc0040cf448 sp=0xc0040cf348 pc=0x1d5c325
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Clone(0xc00322f540?, 0x11e072e?, {{0xc0920400}, {0x1000000}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_clone_amd64.go:36 +0xef fp=0xc0040cf4d0 sp=0xc0040cf448 pc=0x1d008cf
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000f50000, 0x38, {{0xc0920400}, {0x1000000}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xaff fp=0xc0040cf908 sp=0xc0040cf4d0 pc=0x1af213f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000f50000, 0x1?, {{0xc0920400}, {0x1000000}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0040cf9c0 sp=0xc0040cf908 pc=0x1af41fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc009bd23c0?, 0x11e9329?, {{0xc0920400}, {0x1000000}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xbd fp=0xc0040cfa38 sp=0xc0040cf9c0 pc=0x1af3afd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000f50000)
	pkg/sentry/kernel/task_syscall.go:257 +0x55b fp=0xc0040cfb70 sp=0xc0040cfa38 pc=0x1af365b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000f50000?, 0xc000f50000)
	pkg/sentry/kernel/task_run.go:269 +0x2387 fp=0xc0040cfe60 sp=0xc0040cfb70 pc=0x1adc487
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000f50000, 0x2f70)
	pkg/sentry/kernel/task_run.go:98 +0x36a fp=0xc0040cffb0 sp=0xc0040cfe60 pc=0x1ad97ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x45 fp=0xc0040cffe0 sp=0xc0040cffb0 pc=0x1aef9a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc0040cffe8 sp=0xc0040cffe0 pc=0x11e6101
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 604045
	pkg/sentry/kernel/task_start.go:395 +0x1ce