panic: Incrementing non-positive ref count

goroutine 778736 [running]:
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).IncRef(...)
	pkg/refs/refcounter.go:370
gvisor.dev/gvisor/pkg/sentry/fs.(*Dirent).IncRef(0xc000017ad0)
	pkg/sentry/fs/dirent.go:1309 +0xf7
gvisor.dev/gvisor/pkg/sentry/fs.(*Mount).Root(...)
	pkg/sentry/fs/mounts.go:106
gvisor.dev/gvisor/pkg/sentry/fs/proc.forEachMount(0xc001202000, 0xc0005f1010)
	pkg/sentry/fs/proc/mounts.go:59 +0x2bd
gvisor.dev/gvisor/pkg/sentry/fs/proc.(*mountsFile).ReadSeqFileData(0xc000784288, 0x13d18c0, 0xc00110c000, 0x0, 0x0, 0x8ae292, 0x8ae906, 0xc000e046a8, 0x15ad5c4d40000000)
	pkg/sentry/fs/proc/mounts.go:174 +0xd1
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc000e04680, 0x13d18c0, 0xc00110c000, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:180 +0x136
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*seqFileOperations).Read(0xc0007842c0, 0x13d18c0, 0xc00110c000, 0xc000851a20, 0x13cf600, 0xc001043000, 0x0, 0x1, 0x0, 0x1b5, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:229 +0xedc
gvisor.dev/gvisor/pkg/sentry/fs.(*File).Readv(0xc000851a20, 0x13d18c0, 0xc00110c000, 0x13cf600, 0xc001043000, 0x0, 0x1, 0x0, 0x1b5, 0x100, ...)
	pkg/sentry/fs/file.go:270 +0x231
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readv(0xc00110c000, 0xc000851a20, 0x13cf600, 0xc001043000, 0x0, 0x1, 0x0, 0x1b5, 0x100, 0x1b5, ...)
	pkg/sentry/syscalls/linux/sys_read.go:257 +0xe1
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Read(0xc00110c000, 0x3, 0x0, 0x1b5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:71 +0x292
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00110c000, 0x0, 0x3, 0x0, 0x1b5, 0x0, 0x0, 0x0, 0x4679d1, 0xc00110c7d8, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x408
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00110c000, 0x0, 0x3, 0x0, 0x1b5, 0x0, 0x0, 0x0, 0x0, 0xc000af34a0)
	pkg/sentry/kernel/task_syscall.go:283 +0xb5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00110c000, 0x0, 0x3, 0x0, 0x1b5, 0x0, 0x0, 0x0, 0xc0005f1d38, 0xd88b25)
	pkg/sentry/kernel/task_syscall.go:244 +0x10a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00110c000, 0x2, 0xc0008a87c0)
	pkg/sentry/kernel/task_syscall.go:219 +0x1b7
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00110c000, 0x13b6b60, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0x1524
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00110c000, 0x76a2)
	pkg/sentry/kernel/task_run.go:91 +0x2e6
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:286 +0x19e