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 421247 [running]:
panic(0x1104b00, 0x1ceb110)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc00192b410 sp=0xc00192b358 pc=0x437110
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc00192b440 sp=0xc00192b410 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x14224a0, 0xc0161daa80)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc00192b480 sp=0xc00192b440 pc=0x7d93be
runtime.call32(0x0, 0x12dd8e0, 0xc00d3009a8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc00192b4b0 sp=0xc00192b480 pc=0x46edfe
runtime.reflectcallSave(0xc00192b5e0, 0x12dd8e0, 0xc00d3009a8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc00192b4e0 sp=0xc00192b4b0 pc=0x436bd8
runtime.runOpenDeferFrame(0xc00bf1af00, 0xc00d300960, 0xc00a3f6628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc00192b570 sp=0xc00192b4e0 pc=0x436a8d
panic(0x1104b00, 0x1ceb110)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc00192b628 sp=0xc00192b570 pc=0x436e15
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc00192b658 sp=0xc00192b628 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(0x14224a0, 0xc0161daa80, 0xc000373088, 0xc001dd2420, 0xc00c47c800, 0x0, 0xc00c47cb00, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc00192b7e0 sp=0xc00192b658 pc=0xf3dcf7
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d31e60, 0x14224a0, 0xc0161daa80, 0xc000373088, 0xc001dd2420, 0xc00c47c800, 0x0, 0xc00c47cb00, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc00192b860 sp=0xc00192b7e0 pc=0xf4e485
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc000373088, 0x14224a0, 0xc0161daa80, 0xc001dd2420, 0xc00c47c800, 0x0, 0xc00c47c700, 0x4, 0xc00192bae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc00192b930 sp=0xc00192b860 pc=0x7e539c
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc000373088, 0x14224a0, 0xc0161daa80, 0xc001dd2420, 0xc00c47c800, 0x0, 0xc00192bb18, 0xc00c47c700, 0x4, 0xc00a3f6ae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc00192b9d0 sp=0xc00192b930 pc=0x7e5ade
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0161daa80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc00192bb90 sp=0xc00192b9d0 pc=0xe5f1f4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0161daa80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x1289700, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc00192bc50 sp=0xc00192bb90 pc=0xa4d459
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0161daa80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc00192bcd8 sp=0xc00192bc50 pc=0xa4e710
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0161daa80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc012c238a0, 0xc012c23800)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc00192bd38 sp=0xc00192bcd8 pc=0xa4e214
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0161daa80, 0x2, 0xc0161daa80)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc00192be08 sp=0xc00192bd38 pc=0xa4daf8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0161daa80, 0x13f4980, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc00192bf60 sp=0xc00192be08 pc=0xa405b5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0161daa80, 0x3f15)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc00192bfd0 sp=0xc00192bf60 pc=0xa3f0c2
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc00192bfd8 sp=0xc00192bfd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116