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=0x7d8dfe]

goroutine 779 [running]:
panic(0x110a560, 0x1cfc850)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000b53410 sp=0xc000b53358 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000b53440 sp=0xc000b53410 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x14291c0, 0xc000b46a80)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc000b53480 sp=0xc000b53440 pc=0x7d8dfe
runtime.call32(0x0, 0x12e3ee8, 0xc000a2e2e8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc000b534b0 sp=0xc000b53480 pc=0x46ed1e
runtime.reflectcallSave(0xc000b535e0, 0x12e3ee8, 0xc000a2e2e8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc000b534e0 sp=0xc000b534b0 pc=0x436af8
runtime.runOpenDeferFrame(0xc00090b500, 0xc000a2e2a0, 0xc000b53628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc000b53570 sp=0xc000b534e0 pc=0x4369ad
panic(0x110a560, 0x1cfc850)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc000b53628 sp=0xc000b53570 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000b53658 sp=0xc000b53628 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:347
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x14291c0, 0xc000b46a80, 0xc0004e2188, 0xc00075c9c0, 0xc000946600, 0x0, 0xc000946800, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc000b537e0 sp=0xc000b53658 pc=0xf437d7
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d434a0, 0x14291c0, 0xc000b46a80, 0xc0004e2188, 0xc00075c9c0, 0xc000946600, 0x0, 0xc000946800, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc000b53860 sp=0xc000b537e0 pc=0xf53f65
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0004e2188, 0x14291c0, 0xc000b46a80, 0xc00075c9c0, 0xc000946600, 0x0, 0xc000946500, 0x4, 0xc000b53ae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc000b53930 sp=0xc000b53860 pc=0x7e4ddc
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0004e2188, 0x14291c0, 0xc000b46a80, 0xc00075c9c0, 0xc000946600, 0x0, 0xc000b53b18, 0xc000946500, 0x4, 0xc000b53ae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc000b539d0 sp=0xc000b53930 pc=0x7e551e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc000b46a80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc000b53b90 sp=0xc000b539d0 pc=0xe5dff4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000b46a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x128eae0, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc000b53c50 sp=0xc000b53b90 pc=0xa4e1d9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000b46a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc000b53cd8 sp=0xc000b53c50 pc=0xa4f490
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000b46a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc000c1a0a0, 0xc000c1a000)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc000b53d38 sp=0xc000b53cd8 pc=0xa4ef94
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000b46a80, 0x2, 0xc000b46a80)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc000b53e08 sp=0xc000b53d38 pc=0xa4e878
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000b46a80, 0x13fb600, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc000b53f60 sp=0xc000b53e08 pc=0xa41335
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000b46a80, 0x25)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc000b53fd0 sp=0xc000b53f60 pc=0xa3fe42
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000b53fd8 sp=0xc000b53fd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116