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 29481 [running]:
panic(0x1104b00, 0x1ceb110)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc003313410 sp=0xc003313358 pc=0x437110
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc003313440 sp=0xc003313410 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x14224a0, 0xc0032b9500)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc003313480 sp=0xc003313440 pc=0x7d93be
runtime.call32(0x0, 0x12dd8e0, 0xc0029a2228, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc0033134b0 sp=0xc003313480 pc=0x46edfe
runtime.reflectcallSave(0xc0033135e0, 0x12dd8e0, 0xc0029a2228, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc0033134e0 sp=0xc0033134b0 pc=0x436bd8
runtime.runOpenDeferFrame(0xc0032be180, 0xc0029a21e0, 0xc003313628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc003313570 sp=0xc0033134e0 pc=0x436a8d
panic(0x1104b00, 0x1ceb110)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc003313628 sp=0xc003313570 pc=0x436e15
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc003313658 sp=0xc003313628 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, 0xc0032b9500, 0xc0001ba188, 0xc0023770e0, 0xc0035b6100, 0x0, 0xc0035b6300, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc0033137e0 sp=0xc003313658 pc=0xf3dcf7
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d31e60, 0x14224a0, 0xc0032b9500, 0xc0001ba188, 0xc0023770e0, 0xc0035b6100, 0x0, 0xc0035b6300, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc003313860 sp=0xc0033137e0 pc=0xf4e485
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0001ba188, 0x14224a0, 0xc0032b9500, 0xc0023770e0, 0xc0035b6100, 0x0, 0xc0035b6000, 0x4, 0xc003313ae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc003313930 sp=0xc003313860 pc=0x7e539c
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0001ba188, 0x14224a0, 0xc0032b9500, 0xc0023770e0, 0xc0035b6100, 0x0, 0xc003313b18, 0xc0035b6000, 0x4, 0xc003313ae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc0033139d0 sp=0xc003313930 pc=0x7e5ade
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0032b9500, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc003313b90 sp=0xc0033139d0 pc=0xe5f1f4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0032b9500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x1289700, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc003313c50 sp=0xc003313b90 pc=0xa4d459
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0032b9500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc003313cd8 sp=0xc003313c50 pc=0xa4e710
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0032b9500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc0031f71e0, 0xc0031f7140)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc003313d38 sp=0xc003313cd8 pc=0xa4e214
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0032b9500, 0x2, 0xc0032b9500)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc003313e08 sp=0xc003313d38 pc=0xa4daf8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0032b9500, 0x13f4980, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc003313f60 sp=0xc003313e08 pc=0xa405b5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0032b9500, 0x1c9)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc003313fd0 sp=0xc003313f60 pc=0xa3f0c2
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc003313fd8 sp=0xc003313fd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116