panic: Incrementing non-positive count 0xc00889e108 on tmpfs.inode

goroutine 168 [running]:
panic({0x10f8140?, 0xc008c42570?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc00960f500 sp=0xc00960f450 pc=0x43a72c
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*inodeRefs).IncRef(0xc00889e108)
	bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/tmpfs/inode_refs.go:81 +0x119 fp=0xc00960f568 sp=0xc00960f500 pc=0x912af9
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*inode).incRef(...)
	pkg/sentry/fsimpl/tmpfs/tmpfs.go:591
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*dentry).IncRef(...)
	pkg/sentry/fsimpl/tmpfs/tmpfs.go:447
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*filesystem).GetDentryAt(0xc0005c8fd8?, {0x1587498, 0xc0009c0a80}, 0xc0002f0480, {0x80?})
	pkg/sentry/fsimpl/tmpfs/filesystem.go:256 +0x216 fp=0xc00960f5d8 sp=0xc00960f568 pc=0x90a856
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).GetDentryAt(0x40?, {0x1587498, 0xc0009c0a80}, 0xc?, 0xc00960f678?, 0xc00960f677)
	pkg/sentry/vfs/vfs.go:263 +0x9f fp=0xc00960f640 sp=0xc00960f5d8 pc=0x7ae45f
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).getMountpoint(0xc00023b4a0?, {0x1587498, 0xc0009c0a80}, 0xc0007ab048?, 0xc00023b4a0?)
	pkg/sentry/vfs/mount.go:909 +0x3f fp=0xc00960f6a8 sp=0xc00960f640 pc=0x79de9f
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc0005c8fd8, {0x1587498, 0xc0009c0a80}, 0xc000b10800?, 0xc001da2000?, 0xc00960f804)
	pkg/sentry/vfs/mount.go:571 +0xdd fp=0xc00960f778 sp=0xc00960f6a8 pc=0x79c5bd
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc0009c0a80, 0x42?, {{0x7f3af2ac6500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x2f7 fp=0xc00960f910 sp=0xc00960f778 pc=0xb987d7
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0009c0a80, 0xa6, {{0x7f3af2ac6500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc00960fc50 sp=0xc00960f910 pc=0xa25e2b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0009c0a80, 0xc00192f0e0?, {{0x7f3af2ac6500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4e fp=0xc00960fcb0 sp=0xc00960fc50 pc=0xa2742e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x0?, 0xc0007c9200?, {{0x7f3af2ac6500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x74 fp=0xc00960fd10 sp=0xc00960fcb0 pc=0xa26ff4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0005c4ea0?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3a8 fp=0xc00960fe08 sp=0xc00960fd10 pc=0xa26ce8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0009c0a80?, 0xc0009c0a80)
	pkg/sentry/kernel/task_run.go:269 +0x1405 fp=0xc00960ff48 sp=0xc00960fe08 pc=0xa18de5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0009c0a80, 0x17)
	pkg/sentry/kernel/task_run.go:98 +0x262 fp=0xc00960ffc0 sp=0xc00960ff48 pc=0xa17302
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x25 fp=0xc00960ffe0 sp=0xc00960ffc0 pc=0xa24325
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc00960ffe8 sp=0xc00960ffe0 pc=0x471241
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 258
	pkg/sentry/kernel/task_start.go:391 +0xf8