[Gluster-devel] detected cyclic loop formation during inode linkage

[Emmanuel Dreyfus]

Ooops, sorry for posting without a subject. Here is the thing again.

> Hi
> 
> Test case: calling getcwd(3) in a directory on NetBSD
> - glusterfs release-3.3 has no problem
> - glusterfs 3.2.7 has a funny bug when a node TTL is expired *and* if
> the getcwd program is stored in the glusterfs volume.
> 
> # cd /gfs/manu/bugB4 && /gfs/manu/getcwd/getcwd && sleep 2 && \
>   /gfs/manu/getcwd/getcwd
> getcwd = "/gfs/manu/bugB4"
> getcwd = "(null)"
> 
> # cd /gfs/manu/bugB4 && /tmp/getcwd && sleep 2 && /tmp/getcwd
> getcwd = "/gfs/manu/bugB4"
> getcwd = "/gfs/manu/bugB4"
> 
> When it fails the client logs say:
> [2012-08-09 06:45:37.338851] W [inode.c:180:__foreach_ancestor_dentry]
>     0-: per dentry fn returned 1
> [2012-08-09 06:45:37.339021] C [inode.c:232:__is_dentry_cyclic]
>     0-gfs/inode: detected cyclic loop formation during inode linkage.
>     inode (-5514238854638478444/20958215-feaa-4648-acde-5f3e8da776e5) l
>     linking under itself as ..
> [2012-08-09 06:45:37.339112] W [inode.c:844:inode_lookup]  0-: inode
>     not found
> 
> Is that a bug in glusterfs 3.2.7 or an inaccuracy in NetBSD FUSE? Here
> is getcwd sources for anyone willing to test:
> 
> /* cc -o getcwd getcwd.c */
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/param.h>
> 
> int
> main(void)
> {
>         char buf[MAXPATHLEN + 1];
> 
>         (void)printf("getcwd = \"%s\"\n", getcwd(buf, MAXPATHLEN));
> 
>         return 0;
> }


-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu at netbsd.org