From alert log:
Current log# 2 seq# 3744 mem# 1: /oraredo2/RPTS/redo12_2.logThu Feb 10 19:13:20 2011GES: Potential blocker (pid=22180) on resource TX-00260029-003FCA69; enqueue info in file /opt/app/oracle/admin/RPTS/bdump/rpts1_lmd0_12113.trc and DIAG trace fileThu Feb 10 20:37:53 2011GES: Potential blocker (pid=14397) on resource TX-003F002C-002AF21C; enqueue info in file /opt/app/oracle/admin/RPTS/udump/rpts1_ora_14399.trc and DIAG trace fileThu Feb 10 20:37:56 2011GES: Potential blocker (pid=25233) on resource TX-00440002-002BF3D2; enqueue info in file /opt/app/oracle/admin/RPTS/udump/rpts1_ora_2266.trc and DIAG trace fileThu Feb 10 20:38:00 2011GES: Potential blocker (pid=22180) on resource TX-00260029-003FCA69; enqueue info in file /opt/app/oracle/admin/RPTS/bdump/rpts1_lmd0_12113.trc and DIAG trace file
From trace file:
*** 2010-11-09 21:00:55.461*** SERVICE NAME:() 2010-11-09 21:00:55.460*** SESSION ID:(1101.1) 2010-11-09 21:00:55.460 syncr inc 129 lvl 1 from 2 rcvd (my inc,lvl: 0, 0) (129/4.0.0) syncr inc 129 lvl 1 from 1 rcvd (my inc,lvl: 129, 1) (129/5.0.0) s2m domain info received from 1 (129.6)* s2m: domain 0 valid according to instance 1 s2m domain info received from 2 (129.6) ftd received from node 2 (129/7.0.0) first hvmap received from 1 for domain 0 (129.7)* kjxhvmaph: domain 0 valid = 1 according to instance 1 last hvmap received from 1, (129.7) first hvmap received from 1 for enqueue mappings (129.7) last hvmap received from 1, (129.7) ptmap received from node 1 (129.7) ftd received from node 1 (129/7.0.0) all ftds received syncr inc 129 lvl 2 from 1 rcvd (my inc,lvl: 129, 1) (129/7.0.0) syncr inc 129 lvl 2 from 2 rcvd (my inc,lvl: 129, 2) (129/7.0.0) ftd received from node 2 (129/13.0.0) ftd received from node 1 (129/13.0.0) all ftds received syncr inc 129 lvl 3 from 1 rcvd (my inc,lvl: 129, 2) (129/13.0.0) syncr inc 129 lvl 3 from 2 rcvd (my inc,lvl: 129, 3) (129/13.0.0) ftd received from node 2 (129/15.0.0) syncr inc 129 lvl 4 from 2 rcvd (my inc,lvl: 129, 3) (129/15.0.0) ftd received from node 1 (129/15.0.0) all ftds received syncr inc 129 lvl 4 from 1 rcvd (my inc,lvl: 129, 4) (129/15.0.0) ftd received from node 2 (129/17.0.0) ftd received from node 1 (129/18.0.0) all ftds received syncr inc 129 lvl 5 from 2 rcvd (my inc,lvl: 129, 4) (129/18.0.0) syncr inc 129 lvl 5 from 1 rcvd (my inc,lvl: 129, 5) (129/18.0.0) ftd received from node 2 (129/20.0.0) ftd received from node 1 (129/20.0.0) all ftds received syncr inc 129 lvl 6 from 1 rcvd (my inc,lvl: 129, 5) (129/20.0.0)It is said that it is a bug :
Ref:
Bug 5898210 - Hang from concurrent MV refresh and library cache invalidation in RAC [ID 5898210.8]