Hello,
I just ran into this issue:
$ mkdir /boot
$ mount /dev/mmc2.0 /boot
$ ls /mnt/mmc2.0/
mounted /dev/mmc2.0 on /boot
mounted /dev/mmc2.0 on /boot
mounted /dev/mmc2.0 on /boot
[ Ad infinitum ]
This is more readily reproducible with barebox platforms where a separate
boot partition is default-mounted as /boot. In that case, accessing the
partition's corresponding /mnt entry will hang.
The hang can be traced back to fs/fs.c:follow_managed():
while (managed = path->dentry->d_flags,
managed &= DCACHE_MANAGED_DENTRY,
managed != 0) {
if (managed & DCACHE_MOUNTED) {
struct vfsmount *mounted = lookup_mnt(path);
if (mounted) {
dput(path->dentry);
if (need_mntput)
mntput(path->mnt);
path->mnt = mounted;
path->dentry = dget(mounted->mnt_root);
need_mntput = true;
continue;
}
}
/* Handle an automount point */
if (managed & DCACHE_NEED_AUTOMOUNT) {
ret = follow_automount(path, nd, &need_mntput);
if (ret < 0)
break;
continue;
}
/* We didn't change the current path point */
break;
}
The code attempts the follow_automount, which would succeed here,
but it doesn't actually mount the current mount point, so we never
enter the first if clause that would change path->dentry and lead
us out of the loop.
I am unsure at what layer this should be fixed. Any suggestions?
Cheers,
Ahmad
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