panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x79baea]

goroutine 1543072 [running]:
panic({0x11638c0, 0x2a394f0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0108efff8 sp=0xc0108eff38 pc=0x436abb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0108f0058 sp=0xc0108efff8 pc=0x44e0fd
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x1151ca0?)
	pkg/sentry/vfs/mount.go:681 +0xa fp=0xc0108f0060 sp=0xc0108f0058 pc=0x79baea
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc0005401e0, 0x0)
	pkg/sentry/vfs/namespace.go:143 +0x1b2 fp=0xc0108f0130 sp=0xc0108f0060 pc=0x7a1472
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc00034df40, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0200 sp=0xc0108f0130 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc005f22000, 0xc00340a0a0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f02d0 sp=0xc0108f0200 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc00959ebe0, 0xc00340a000)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f03a0 sp=0xc0108f02d0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf2c0, 0xc005351f40)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0470 sp=0xc0108f03a0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf360, 0xc005351ea0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0540 sp=0xc0108f0470 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf4a0, 0xc005351e00)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0610 sp=0xc0108f0540 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf220, 0xc005351d60)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f06e0 sp=0xc0108f0610 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf540, 0xc005351b80)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f07b0 sp=0xc0108f06e0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf0e0, 0xc005351ae0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0880 sp=0xc0108f07b0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf5e0, 0xc005351900)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0950 sp=0xc0108f0880 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baefa0, 0xc005351860)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0a20 sp=0xc0108f0950 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf680, 0xc0053517c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0af0 sp=0xc0108f0a20 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baee60, 0xc005351680)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0bc0 sp=0xc0108f0af0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf720, 0xc005351720)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0c90 sp=0xc0108f0bc0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baedc0, 0xc0053515e0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0d60 sp=0xc0108f0c90 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baed20, 0xc0053514a0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0e30 sp=0xc0108f0d60 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf860, 0xc005351400)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0f00 sp=0xc0108f0e30 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baec80, 0xc005351360)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f0fd0 sp=0xc0108f0f00 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004baf9a0, 0xc0053512c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f10a0 sp=0xc0108f0fd0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc004bafa40, 0xc005351220)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f1170 sp=0xc0108f10a0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc005350320, 0xc005351180)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f1240 sp=0xc0108f1170 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc000540f00, 0xc0053510e0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f1310 sp=0xc0108f1240 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc009c5cfd0, 0xc009c5cfe0, 0xc00034d400, 0xc005351040)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0108f13e0 sp=0xc0108f1310 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc0004a61e0, {0x153d540, 0xc006a1b500}, 0xc0005682a0, 0xc000866ba0, 0x88d5ca?, 0x4047ac?, {0x1521220, 0xc0004a6000})
	pkg/sentry/vfs/namespace.go:186 +0x285 fp=0xc0108f14a8 sp=0xc0108f13e0 pc=0x7a1845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Clone(0xc006a1b500, 0xc0108f18a8)
	pkg/sentry/kernel/task_clone.go:205 +0xf3c fp=0xc0108f1880 sp=0xc0108f14a8 pc=0x9b6efc
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Clone3(0x2a94680?, 0xc00cf039b8?, {{0x7f6dedae4fb0}, {0x58}, {0x7f6dedae4fb0}, {0x0}, {0x0}, {0x58}})
	pkg/sentry/syscalls/linux/sys_thread.go:252 +0xe6 fp=0xc0108f1918 sp=0xc0108f1880 pc=0xb7b986
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc006a1b500, 0x1b3, {{0x7f6dedae4fb0}, {0x58}, {0x7f6dedae4fb0}, {0x0}, {0x0}, {0x58}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc0108f1c58 sp=0xc0108f1918 pc=0x9db8cb
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc006a1b500, 0x1?, {{0x7f6dedae4fb0}, {0x58}, {0x7f6dedae4fb0}, {0x0}, {0x0}, {0x58}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc0108f1cb8 sp=0xc0108f1c58 pc=0x9dceb4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0000345e0?, 0xc00cf03e00?, {{0x7f6dedae4fb0}, {0x58}, {0x7f6dedae4fb0}, {0x0}, {0x0}, {0x58}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc0108f1d18 sp=0xc0108f1cb8 pc=0x9dcaa5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00f6bf130?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc0108f1e10 sp=0xc0108f1d18 pc=0x9dc76c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0076f7300?, 0xc006a1b500)
	pkg/sentry/kernel/task_run.go:269 +0x144a fp=0xc0108f1f48 sp=0xc0108f1e10 pc=0x9ce1ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc006a1b500, 0x4508)
	pkg/sentry/kernel/task_run.go:98 +0x25c fp=0xc0108f1fc0 sp=0xc0108f1f48 pc=0x9cc69c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x2a fp=0xc0108f1fe0 sp=0xc0108f1fc0 pc=0x9d9d4a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0108f1fe8 sp=0xc0108f1fe0 pc=0x46d4c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:395 +0x105