Today morning a box got rebooted, crs(10.2.0.5 vesrsion) didn’t come up automatically. Manual crsctl start crs command didn’t update any log file in crsd,cssd, or even the alertxx4040.log

xx4040: (test1) /etc/oracle/scls_scr/test1/root> cat crsstart
enable
xx4040: (test1) /etc/oracle/scls_scr/test1/root>

So, as crsstart is enabled, it should have come up automatically.Ran cluvfy

xx4040: (test1) /home/oracle>cluvfy stage -pre crsinst -n test1,test2 -verbose
Performing pre-checks for cluster services setup
Checking node reachability...
Check: Node reachability from node "test1"
  Destination Node                      Reachable?
  ------------------------------------  ------------------------
  test1                                yes
  test2                                yes
Result: Node reachability check passed from node "test1".
Checking user equivalence...
Check: User equivalence for user "oracle"
  Node Name                             Comment
  ------------------------------------  ------------------------
  test2                                passed
  test1                                passed
Result: User equivalence check passed for user "oracle".
ERROR:
Path "/tmp/" is not a writable directory on nodes:
        test1,test2
Please choose a different work area using CV_DESTLOC.
Verification cannot proceed.
Pre-check for cluster services setup was unsuccessful on all the nodes.

/var/log/messages showed –

Oct 25 00:10:12 xx4040 logger: Cluster Ready Services waiting on dependencies. Diagnostics in /tmp/crsctl.5232.
Oct 25 00:10:12 xx4040 logger: Cluster Ready Services waiting on dependencies. Diagnostics in /tmp/crsctl.4628.
Oct 25 00:10:12 xx4040 logger: Cluster Ready Services waiting on dependencies. Diagnostics in /tmp/crsctl.5230.

Checked the ownership and permission on /tmp

drwxr-xr-x    14 root   root   4096 Oct 25 00:08 tmp

Changed the permission to 777 of tmp and started the crs, and all started well :).
Update from the comments by Frits Hoogland –> The required permission for tmp is 1777 where 1 is for the sticky bit.
While searching on internet, got another article which could be helpful –
http://blogs.oracle.com/gverma/entry/crsctl_start_crs_does_not_work