panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x7878ea]

goroutine 1752912 [running]:
panic({0x1115fa0?, 0x2a4c590?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc0012170c0 sp=0xc001217010 pc=0x43a72c
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:261
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:861 +0x378 fp=0xc001217120 sp=0xc0012170c0 pc=0x451f38
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x1108f40?)
	pkg/sentry/vfs/mount.go:693 +0xa fp=0xc001217128 sp=0xc001217120 pc=0x7878ea
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc0000df220, 0x0)
	pkg/sentry/vfs/namespace.go:143 +0x1be fp=0xc0012171f8 sp=0xc001217128 pc=0x78cffe
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc0000dee60, 0xc002bb0460)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0012172c8 sp=0xc0012171f8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc002bb03c0, 0xc002bb0500)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001217398 sp=0xc0012172c8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc004e2afa0, 0xc002bb0320)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001217468 sp=0xc001217398 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc0001397c0, 0xc002bb0280)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001217538 sp=0xc001217468 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc008749250, 0xc008749260, 0xc0000de1e0, 0xc002bb01e0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001217608 sp=0xc001217538 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc0004fafe0, {0x15144d8, 0xc00d72ca80}, 0xc00060d5c0, 0xc0005e2690, 0xc000a45724?, 0x12c7213?, {0x14f7f60, 0xc0004fae00})
	pkg/sentry/vfs/namespace.go:186 +0x270 fp=0xc0012176d0 sp=0xc001217608 pc=0x78d3b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc00d72ca80, 0x20200)
	pkg/sentry/kernel/task_clone.go:667 +0xfb3 fp=0xc0012178f0 sp=0xc0012176d0 pc=0x99fe33
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0xc00d72ca80?, 0xc000a45960?, {{0x20200}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_thread.go:494 +0x6c fp=0xc001217910 sp=0xc0012178f0 pc=0xb56b8c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00d72ca80, 0x110, {{0x20200}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc001217c50 sp=0xc001217910 pc=0x9bfc4b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00d72ca80, 0x0?, {{0x20200}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4e fp=0xc001217cb0 sp=0xc001217c50 pc=0x9c124e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000028238?, 0xc000a45df8?, {{0x20200}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x74 fp=0xc001217d10 sp=0xc001217cb0 pc=0x9c0e14
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc010a78f20?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3a8 fp=0xc001217e08 sp=0xc001217d10 pc=0x9c0b08
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc001c90d00?, 0xc00d72ca80)
	pkg/sentry/kernel/task_run.go:269 +0x1405 fp=0xc001217f48 sp=0xc001217e08 pc=0x9b2bc5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00d72ca80, 0x8c81)
	pkg/sentry/kernel/task_run.go:98 +0x262 fp=0xc001217fc0 sp=0xc001217f48 pc=0x9b10e2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x25 fp=0xc001217fe0 sp=0xc001217fc0 pc=0x9be145
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc001217fe8 sp=0xc001217fe0 pc=0x471241
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1752784
	pkg/sentry/kernel/task_start.go:395 +0xf8