panic: Incrementing non-positive ref count

goroutine 5195 [running]:
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).IncRef(...)
	pkg/refs/refcounter.go:374
gvisor.dev/gvisor/pkg/sentry/fs.(*Dirent).IncRef(...)
	pkg/sentry/fs/dirent.go:1311
gvisor.dev/gvisor/pkg/sentry/fs.(*Mount).Root(...)
	pkg/sentry/fs/mounts.go:106
gvisor.dev/gvisor/pkg/sentry/fs/proc.forEachMount(0xc0007eaa80, 0xc000c8d2f8)
	pkg/sentry/fs/proc/mounts.go:62 +0x392
gvisor.dev/gvisor/pkg/sentry/fs/proc.(*mountsFile).ReadSeqFileData(0xc000a00168, 0xef5020, 0xc0007eaa80, 0x0, 0x0, 0x15ef57724f8ad913, 0xc0002d2940, 0xeeb880, 0xc0002d2940)
	pkg/sentry/fs/proc/mounts.go:198 +0x7d
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc000d92d00, 0xef5020, 0xc0007eaa80, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:180 +0x91
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*seqFileOperations).Read(0xc000a00180, 0xef5020, 0xc0007eaa80, 0xc000d9e840, 0xef08c0, 0xc000a9d000, 0x0, 0x1, 0x0, 0x0, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:229 +0xb07
gvisor.dev/gvisor/pkg/sentry/fs.(*File).Readv(0xc000d9e840, 0xef5020, 0xc0007eaa80, 0xef08c0, 0xc000a9d000, 0x0, 0x1, 0x0, 0x0, 0x100, ...)
	pkg/sentry/fs/file.go:270 +0x1e8
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readv(0xc0007eaa80, 0xc000d9e840, 0xef08c0, 0xc000a9d000, 0x0, 0x1, 0x0, 0x0, 0x100, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:290 +0x90
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Read(0xc0007eaa80, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:70 +0x1ec
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0007eaa80, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:170 +0x125
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0007eaa80, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x66
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0007eaa80, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc000cd46c0, 0x1)
	pkg/sentry/kernel/task_syscall.go:252 +0x96
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0007eaa80, 0x2, 0xc00011a040)
	pkg/sentry/kernel/task_syscall.go:227 +0x139
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0007eaa80, 0xed7560, 0x0)
	pkg/sentry/kernel/task_run.go:232 +0x1119
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0007eaa80, 0x18e)
	pkg/sentry/kernel/task_run.go:92 +0x1bb
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:310 +0xfe