[Bugs] [Bug 1395261] Seeing error messages [snapview-client.c:283: gf_svc_lookup_cbk] and [dht-helper.c:1666ht_inode_ctx_time_update] (-->/ usr/lib64/glusterfs/3.8.4/xlator/cluster/replicate.so(+0x5d75c)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1395261



--- Comment #1 from Nithya Balachandran <nbalacha at redhat.com> ---
Steps to see the issue:

1. Create a pure dist volume with 2 bricks.
2. Fuse mount the volume.
3. Create a directory dir1 and cd into it.
4. Kill one of the brick processes (kill -9)
5. Try to create directories inside dir1


The mount log has the messages:

[2016-11-15 14:06:39.738234] E [dht-helper.c:1666:dht_inode_ctx_time_update]
(-->/usr/local/lib/glusterfs/3.10dev/xlator/protocol/c    lient.so(+0x2f750)
[0x7f1fa58a8750]
-->/usr/local/lib/glusterfs/3.10dev/xlator/cluster/distribute.so(+0x39ffe)
[0x7f1fa5604ffe] -->   
/usr/local/lib/glusterfs/3.10dev/xlator/cluster/distribute.so(+0xde27)
[0x7f1fa55d8e27] ) 0-time-dht: invalid argument: inode [Invalid argument]




RCA:

The function dht_lookup_dir_cbk () does not check if the lookup succeeded on at
least one subvolume before attempting to set the inode ctx.


        this_call_cnt = dht_frame_return (frame);

        if (is_last_call (this_call_cnt)) {
                if (local->need_selfheal) {
                        local->need_selfheal = 0;
                        dht_lookup_everywhere (frame, this, &local->loc);
                        return 0;
                }

                if (local->op_ret == 0) {
                        ret = dht_layout_normalize (this, &local->loc, layout);

                        if (ret != 0) {
                                gf_msg_debug (this->name, 0,
                                              "fixing assignment on %s",
                                              local->loc.path);
                                goto selfheal;
                        }

                        dht_layout_set (this, local->inode, layout);
                }

                dht_inode_ctx_time_update (local->inode, this,
                                           &local->stbuf, 1); <-- local->inode
is NULL here as the directory was not found on any brick.

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