Bug 843160

Description of problem:

This commit
http://git.fedorahosted.org/git/?p=cluster.git;a=commitdiff;h=4039bf4817a96b6aab20de948389f43b89ce4a8e

fixing bug 594511 was not a complete solution.  The chance remains that dlm_controld will get stuck waiting for fencing that has already happened.

dlm_controld is checking that the last_fenced_time is >= the time the failed node was removed from the cpg (fail_time).  But, a fast fencing agent and a delayed cpg callback can cause the fail_time to be later than the last_fenced_time.  Comparing last_fenced_time to the time the failed node was removed via the cman api probably has a similar problem.

To test this I added usleep(1000000) in del_configfs_node() before rmdir.

fence_tool dump

>1343237151 cluster node 2 removed seq 488
>1343237151 fenced:daemon conf 1 0 1 memb 1 join left 2
>1343237151 fenced:daemon ring 1:488 1 memb 1
>1343237151 fenced:default conf 1 0 1 memb 1 join left 2
>1343237151 add_change cg 4 remove nodeid 2 reason 3
>1343237151 add_change cg 4 m 1 j 0 r 1 f 1
>1343237151 add_victims node 2
>1343237151 check_ringid cluster 488 cpg 1:484
>1343237151 fenced:default ring 1:488 1 memb 1
>1343237151 check_ringid done cluster 488 cpg 1:488
>1343237151 check_quorum done
>1343237151 send_start 1:4 flags 2 started 3 m 1 j 0 r 1 f 1
>1343237151 receive_start 1:4 len 152
>1343237151 match_change 1:4 matches cg 4
>1343237151 wait_messages cg 4 got all 1
>1343237151 set_master from 1 to complete node 1
>1343237151 delay post_fail_delay 0 quorate_from_last_update 0
>1343237151 dct-xen-11 not a cluster member after 0 sec post_fail_delay
>1343237151 fencing node dct-xen-11
>1343237151 fence dct-xen-11 dev 0.0 agent /bin/true result: success
>1343237151 fence dct-xen-11 success
>1343237151 send_victim_done cg 4 flags 2 victim nodeid 2
>1343237151 send_complete 1:4 flags 2 started 3 m 1 j 0 r 1 f 1
>1343237151 receive_victim_done 1:4 flags 2 len 80
>1343237151 receive_victim_done 1:4 remove victim 2 time 1343237151 how 1
>1343237151 receive_complete 1:4 len 152

dlm_tool dump

>1343237151 cluster node 2 removed seq 488
>1343237151 del_configfs_node rmdir "/sys/kernel/config/dlm/cluster/comms/2"
>1343237152 dlm:controld conf 1 0 1 memb 1 join left 2
>1343237152 dlm:ls:dlm_master conf 1 0 1 memb 1 join left 2
>1343237152 dlm_master add_change cg 3 remove nodeid 2 reason 3
>1343237152 dlm_master add_change cg 3 counts member 1 joined 0 remove 1 failed 1
>1343237152 dlm_master stop_kernel cg 3
>1343237152 write "0" to "/sys/kernel/dlm/dlm_master/control"
>1343237152 dlm_master check_fencing 2 wait add 1343237075 fail 1343237152 last 1343237151


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