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=0x7d90fe]

goroutine 506330 [running]:
panic(0x110a600, 0x1cfb710)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc002d7b410 sp=0xc002d7b358 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc002d7b440 sp=0xc002d7b410 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1428f40, 0xc00c92f500)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc002d7b480 sp=0xc002d7b440 pc=0x7d90fe
runtime.call32(0x0, 0x12e3de0, 0xc00d0c3ba8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc002d7b4b0 sp=0xc002d7b480 pc=0x46ed1e
runtime.reflectcallSave(0xc002d7b5e0, 0x12e3de0, 0xc00d0c3ba8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc002d7b4e0 sp=0xc002d7b4b0 pc=0x436af8
runtime.runOpenDeferFrame(0xc007958c00, 0xc00d0c3b60, 0xc000c11628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc002d7b570 sp=0xc002d7b4e0 pc=0x4369ad
panic(0x110a600, 0x1cfb710)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc002d7b628 sp=0xc002d7b570 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc002d7b658 sp=0xc002d7b628 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(0x1428f40, 0xc00c92f500, 0xc0002dc908, 0xc00936b020, 0xc007478400, 0x0, 0xc007478600, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc002d7b7e0 sp=0xc002d7b658 pc=0xf44057
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d42480, 0x1428f40, 0xc00c92f500, 0xc0002dc908, 0xc00936b020, 0xc007478400, 0x0, 0xc007478600, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc002d7b860 sp=0xc002d7b7e0 pc=0xf547e5
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0002dc908, 0x1428f40, 0xc00c92f500, 0xc00936b020, 0xc007478400, 0x0, 0xc007478300, 0x4, 0xc002d7bae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc002d7b930 sp=0xc002d7b860 pc=0x7e50dc
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0002dc908, 0x1428f40, 0xc00c92f500, 0xc00936b020, 0xc007478400, 0x0, 0xc002d7bb18, 0xc007478300, 0x4, 0xc000c11ae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc002d7b9d0 sp=0xc002d7b930 pc=0x7e581e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc00c92f500, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc002d7bb90 sp=0xc002d7b9d0 pc=0xe5e914
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00c92f500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x128e960, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc002d7bc50 sp=0xc002d7bb90 pc=0xa4cf59
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00c92f500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc002d7bcd8 sp=0xc002d7bc50 pc=0xa4e210
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00c92f500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc012752760, 0xc0127526c0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc002d7bd38 sp=0xc002d7bcd8 pc=0xa4dd14
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00c92f500, 0x2, 0xc00c92f500)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc002d7be08 sp=0xc002d7bd38 pc=0xa4d5f8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00c92f500, 0x13fb380, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc002d7bf60 sp=0xc002d7be08 pc=0xa400b5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00c92f500, 0x5390)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc002d7bfd0 sp=0xc002d7bf60 pc=0xa3ebc2
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc002d7bfd8 sp=0xc002d7bfd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116