panic: runtime error: invalid memory address or nil pointer dereference
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x7d93be]

goroutine 163368 [running]:
panic(0x1103bc0, 0x1cea070)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000b69410 sp=0xc000b69358 pc=0x437110
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000b69440 sp=0xc000b69410 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1421460, 0xc0877b8000)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc000b69480 sp=0xc000b69440 pc=0x7d93be
runtime.call32(0x0, 0x12dc8a0, 0xc00231e168, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc000b694b0 sp=0xc000b69480 pc=0x46edfe
runtime.reflectcallSave(0xc000b695e0, 0x12dc8a0, 0xc00231e168, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc000b694e0 sp=0xc000b694b0 pc=0x436bd8
runtime.runOpenDeferFrame(0xc001b0aa80, 0xc00231e120, 0xc0025fa628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc000b69570 sp=0xc000b694e0 pc=0x436a8d
panic(0x1103bc0, 0x1cea070)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc000b69628 sp=0xc000b69570 pc=0x436e15
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000b69658 sp=0xc000b69628 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:347
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1421460, 0xc0877b8000, 0xc0002b5088, 0xc001f7f260, 0xc0894feb00, 0x0, 0xc0894fed00, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc000b697e0 sp=0xc000b69658 pc=0xf3da57
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d30dc0, 0x1421460, 0xc0877b8000, 0xc0002b5088, 0xc001f7f260, 0xc0894feb00, 0x0, 0xc0894fed00, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc000b69860 sp=0xc000b697e0 pc=0xf4e1e5
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0002b5088, 0x1421460, 0xc0877b8000, 0xc001f7f260, 0xc0894feb00, 0x0, 0xc0894fea00, 0x4, 0xc000b69ae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc000b69930 sp=0xc000b69860 pc=0x7e539c
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0002b5088, 0x1421460, 0xc0877b8000, 0xc001f7f260, 0xc0894feb00, 0x0, 0xc000b69b18, 0xc0894fea00, 0x4, 0xc0025faae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc000b699d0 sp=0xc000b69930 pc=0x7e5ade
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0877b8000, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc000b69b90 sp=0xc000b699d0 pc=0xe5efb4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0877b8000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x12886c0, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc000b69c50 sp=0xc000b69b90 pc=0xa4d219
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0877b8000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc000b69cd8 sp=0xc000b69c50 pc=0xa4e4d0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0877b8000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc112e3c460, 0xc112e3c3c0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc000b69d38 sp=0xc000b69cd8 pc=0xa4dfd4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0877b8000, 0x2, 0xc0877b8000)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc000b69e08 sp=0xc000b69d38 pc=0xa4d8b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0877b8000, 0x13f3940, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc000b69f60 sp=0xc000b69e08 pc=0xa40375
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0877b8000, 0x1a67)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc000b69fd0 sp=0xc000b69f60 pc=0xa3ee82
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000b69fd8 sp=0xc000b69fd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116