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=0x7a2014]

goroutine 2143 [running]:
panic(0x101bea0, 0x1a7a090)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000a8b380 sp=0xc000a8b2c8 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000a8b3b0 sp=0xc000a8b380 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x131cb80, 0xc000732a80)
	pkg/sentry/vfs/file_description.go:163 +0x54 fp=0xc000a8b3f0 sp=0xc000a8b3b0 pc=0x7a2014
runtime.call32(0x0, 0x11e46e0, 0xc0005d7ea8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc000a8b420 sp=0xc000a8b3f0 pc=0x46ed1e
runtime.reflectcallSave(0xc000a8b550, 0x11e46e0, 0xc0005d7ea8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc000a8b450 sp=0xc000a8b420 pc=0x436af8
runtime.runOpenDeferFrame(0xc0007a2780, 0xc0005d7e60, 0xc000a8b598)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc000a8b4e0 sp=0xc000a8b450 pc=0x4369ad
panic(0x101bea0, 0x1a7a090)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc000a8b598 sp=0xc000a8b4e0 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000a8b5c8 sp=0xc000a8b598 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:300
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x131cb80, 0xc000732a80, 0xc000380408, 0xc00060ac60, 0xc000690500, 0x0, 0xc000690700, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:133 +0x418 fp=0xc000a8b750 sp=0xc000a8b5c8 pc=0xe5c398
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1ac0ce0, 0x131cb80, 0xc000732a80, 0xc000380408, 0xc00060ac60, 0xc000690500, 0x0, 0xc000690700, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc000a8b7d0 sp=0xc000a8b750 pc=0xe6b005
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc000380408, 0x131cb80, 0xc000732a80, 0xc00060ac60, 0xc000690500, 0x0, 0xc000690400, 0x4, 0xc000a8ba50, 0x0, ...)
	pkg/sentry/vfs/mount.go:200 +0x13e fp=0xc000a8b8a0 sp=0xc000a8b7d0 pc=0x7ac77e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc000380408, 0x131cb80, 0xc000732a80, 0xc00060ac60, 0xc000690500, 0x0, 0xc000a8ba80, 0xc000690400, 0x4, 0xc000a8ba50, ...)
	pkg/sentry/vfs/mount.go:272 +0xd4 fp=0xc000a8b940 sp=0xc000a8b8a0 pc=0x7ace54
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc000732a80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:112 +0x499 fp=0xc000a8baf8 sp=0xc000a8b940 pc=0xd8abf9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000732a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xdd6f37, 0x119f480, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x13c fp=0xc000a8bc58 sp=0xc000a8baf8 pc=0x9d011c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000732a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:239 +0x66 fp=0xc000a8bce0 sp=0xc000a8bc58 pc=0x9d12e6
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000732a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:199 +0x98 fp=0xc000a8bd40 sp=0xc000a8bce0 pc=0x9d0e98
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000732a80, 0x2, 0xc000732a80)
	pkg/sentry/kernel/task_syscall.go:174 +0x15c fp=0xc000a8be10 sp=0xc000a8bd40 pc=0x9d083c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000732a80, 0x12eee40, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0xc45 fp=0xc000a8bf60 sp=0xc000a8be10 pc=0x9c4c45
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000732a80, 0x2a)
	pkg/sentry/kernel/task_run.go:97 +0x1af fp=0xc000a8bfd0 sp=0xc000a8bf60 pc=0x9c390f
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000a8bfd8 sp=0xc000a8bfd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0xfe