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[QA-39] Database hangs on "cursor: pin S wait on X" wait events. Created: 07/Jun/08  Updated: 07/Jun/08

Status: Closed
Project: Questions & Answers
Fix Version/s: None

Type: Oracle - Database Tuning Priority: Major
Reporter: ubTools Support Assignee: ubTools Support
Resolution: Answered Votes: 0

Product Version: Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
Operating System: IBM-AIX

 Description   
The Database hangs.

The ASH report shows the activity on cursor: pin S wait on X wait event.

Top User Events
Event                        Event Class   % Activity     Avg Active Sessions
cursor: pin S wait on X      Concurrency        98.90                   13.74

An excerpt from SYSTEMSTATE (level 10) dump

PROCESS 23:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=42033 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f3271
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000d44f4280
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4939 efd 0 whr 5 slp 44251
       opr=2 pso=7000000cefa5df0 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 33:
...
    ----------------------------------------
    SO: 7000000f78e0770, type: 4, owner: 7000000fa8bbcf8, flag: INIT/-/-/0x00
    (session) sid: 4976 trans: 7000000f10ce318, creator: 7000000fa8bbcf8, flag: (8100041) USR/- BSY/-/-/-/-/-
              DID: 0001-0021-000193D1, short-term DID: 0000-0000-00000000
              txn branch: 0
              oct: 3, prv: 0, sql: 7000000fc179fa8, psql: 7000000fc68f018, user: 0/SYS
    O/S info: user: orapaky0, term: , ospid: 5099938, machine: akmenkulp2
              program: sqlplus@akmenkulp2 (TNS V1-V3)
    application name: sqlplus@akmenkulp2 (TNS V1-V3), hash value=0
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=27479 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f33be
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc64adb8
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4976 efd 0 whr 5 slp 15527
       opr=2 pso=7000000d86f7d88 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc64ad80
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper EXCL
       Cursor Pin uid 4976 efd 0 whr 1 slp 0
       opr=3 pso=7000000cee2b2c0 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 34:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=63882 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f348e
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fdd75c30
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4693 efd 0 whr 5 slp 62048
       opr=2 pso=7000000e7548610 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 39:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=12512 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f36cf
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fd857ad8
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4970 efd 0 whr 5 slp 12395
       opr=2 pso=7000000cea1c250 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 47:
...
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=48746 wait_time=0 seconds since wait started=0
                  idn=16a1ebe6, value=132e00000000, where|sleeps=5002494fe
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000c5ca4690
         Mutex 7000000d71fd6b0(4910, 0) idn 16a1ebe6 oper GET_SHRD
         Cursor Pin uid 4896 efd 0 whr 5 slp 48634
         opr=2 pso=7000000e24f7e30 flg=0
         pcs=7000000d71fd6b0 nxt=0 flg=35 cld=0 hd=7000000fda5fc00 par=7000000d71fdaa0
         ct=0 hsh=0 unp=0 unn=0 hvl=d71fdd78 nhv=1 ses=7000000f78b5cc0
         hep=7000000d71fd730 flg=80 ld=1 ob=7000000d76d3848 ptr=70000008a8ff478 fex=70000008a8fe788
        ----------------------------------------
...
PROCESS 53:
...
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=38686 wait_time=0 seconds since wait started=0
                  idn=16a1ebe6, value=132e00000000, where|sleeps=500249647
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000db1dee98
         Mutex 7000000d71fd6b0(4910, 0) idn 16a1ebe6 oper GET_SHRD
         Cursor Pin uid 4828 efd 0 whr 5 slp 38647
         opr=2 pso=7000000e7f58940 flg=0
         pcs=7000000d71fd6b0 nxt=0 flg=35 cld=0 hd=7000000fda5fc00 par=7000000d71fdaa0
         ct=0 hsh=0 unp=0 unn=0 hvl=d71fdd78 nhv=1 ses=7000000f78b5cc0
         hep=7000000d71fd730 flg=80 ld=1 ob=7000000d76d3848 ptr=70000008a8ff478 fex=70000008a8fe788
        ----------------------------------------
...
PROCESS 54:
...
      (session) sid: 4910 trans: 0, creator: 7000000d81123c0, flag: (e1) USR/- BSY/-/-/-/-/-
                DID: 0001-002F-00044CCF, short-term DID: 0000-0000-00000000
                txn branch: 0
                oct: 3, prv: 0, sql: 7000000dbd12ce0, psql: 7000000dbb98da0, user: 55/SYSMAN
      O/S info: user: orapaky0, term: unknown, ospid: 1234, machine: akmenkulp2
                program: OMS
      client info: akmenkulp2_Management_Service
      application name: OEM.DefaultPool, hash value=3997945242
      action name: /database/instance/sitemap, hash value=105676648
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=54571 wait_time=0 seconds since wait started=0
                  idn=ec048ba, value=137000000000, where|sleeps=5007f3abc
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000dcd36f50
         Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
         Cursor Pin uid 4910 efd 0 whr 5 slp 53641
         opr=2 pso=7000000e7c7f338 flg=0
         pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
         ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
         hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
        ----------------------------------------
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000dcd36e38
         Mutex 7000000d71fd6b0(4910, 0) idn 16a1ebe6 oper EXCL
         Cursor Pin uid 4910 efd 0 whr 1 slp 0
         opr=3 pso=7000000e79b9030 flg=0
         pcs=7000000d71fd6b0 nxt=0 flg=35 cld=0 hd=7000000fda5fc00 par=7000000d71fdaa0
         ct=0 hsh=0 unp=0 unn=0 hvl=d71fdd78 nhv=1 ses=7000000f78b5cc0
         hep=7000000d71fd730 flg=80 ld=1 ob=7000000d76d3848 ptr=70000008a8ff478 fex=70000008a8fe788
        ----------------------------------------
...
PROCESS 55:
...
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=39147 wait_time=0 seconds since wait started=0
                  idn=16a1ebe6, value=132e00000000, where|sleeps=5002496e9
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000dbb57a10
         Mutex 7000000d71fd6b0(4910, 0) idn 16a1ebe6 oper GET_SHRD
         Cursor Pin uid 4973 efd 0 whr 5 slp 39118
         opr=2 pso=7000000ce4e6fe8 flg=0
         pcs=7000000d71fd6b0 nxt=0 flg=35 cld=0 hd=7000000fda5fc00 par=7000000d71fdaa0
         ct=0 hsh=0 unp=0 unn=0 hvl=d71fdd78 nhv=1 ses=7000000f78b5cc0
         hep=7000000d71fd730 flg=80 ld=1 ob=7000000d76d3848 ptr=70000008a8ff478 fex=70000008a8fe788
        ----------------------------------------
...
PROCESS 62:
...
      (session) sid: 4805 trans: 0, creator: 7000000eab6d018, flag: (e1) USR/- BSY/-/-/-/-/-
                DID: 0001-003E-00010563, short-term DID: 0000-0000-00000000
                txn branch: 0
                oct: 3, prv: 0, sql: 7000000dce39e08, psql: 7000000dc0fc240, user: 72/MENKUL2008
      O/S info: user: akbank, term: L1058, ospid: 3468:3428, machine: AA\L1058
                program: toad.exe
      application name: TOAD 9.1.0.62, hash value=3156025525
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=41562 wait_time=0 seconds since wait started=0
                  idn=ec048ba, value=137000000000, where|sleeps=5007f3dc4
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000db0f6b20
         Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
         Cursor Pin uid 4805 efd 0 whr 5 slp 41523
         opr=2 pso=7000000ce1b0070 flg=0
         pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
         ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
         hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
        ----------------------------------------
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000db0f6ae8
         Mutex 7000000e51cde60(4805, 0) idn 7a99f649 oper EXCL
         Cursor Pin uid 4805 efd 0 whr 1 slp 0
         opr=3 pso=7000000d8b887e8 flg=0
         pcs=7000000e51cde60 nxt=0 flg=35 cld=0 hd=7000000dcd2b108 par=7000000d9991e20
         ct=0 hsh=0 unp=0 unn=0 hvl=d99920f8 nhv=1 ses=7000000f88942e0
         hep=7000000e51cdee0 flg=80 ld=1 ob=7000000e59bf060 ptr=7000000882ed3d8 fex=7000000882ec6e8
        ----------------------------------------
...
PROCESS 65:
...
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=35648 wait_time=0 seconds since wait started=0
                  idn=7a99f649, value=12c500000000, where|sleeps=500028b22
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000fd34bbf8
         Mutex 7000000e51cde60(4805, 0) idn 7a99f649 oper GET_SHRD
         Cursor Pin uid 4570 efd 0 whr 5 slp 35618
         opr=2 pso=7000000d898d0c0 flg=0
         pcs=7000000e51cde60 nxt=0 flg=35 cld=0 hd=7000000dcd2b108 par=7000000d9991e20
         ct=0 hsh=0 unp=0 unn=0 hvl=d99920f8 nhv=1 ses=7000000f88942e0
         hep=7000000e51cdee0 flg=80 ld=1 ob=7000000e59bf060 ptr=7000000882ed3d8 fex=7000000882ec6e8
        ----------------------------------------
...
PROCESS 68:
...
   (session) sid: 4698 trans: 0, creator: 7000000f98a7320, flag: (41) USR/- BSY/-/-/-/-/-
              DID: 0001-0044-00000344, short-term DID: 0000-0000-00000000
              txn branch: 0
              oct: 3, prv: 0, sql: 7000000c5281eb8, psql: 7000000d4d7e910, user: 72/MENKUL2008
    O/S info: user: geneks, term: AKYGM011, ospid: 3168:3148, machine: AKYATIRIM\AKYGM011
              program:
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=44607 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f3dfe
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000dc155c48
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4698 efd 0 whr 5 slp 8722
       opr=2 pso=7000000cea6fce8 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000dc155c10
       Mutex 7000000e5f9cd90(4698, 0) idn 651e7adb oper EXCL
       Cursor Pin uid 4698 efd 0 whr 1 slp 0
       opr=3 pso=7000000cef62b68 flg=0
       pcs=7000000e5f9cd90 nxt=0 flg=34 cld=1 hd=7000000dcea52a8 par=7000000e5f9d708
       ct=1 hsh=0 unp=0 unn=0 hvl=e5f9d098 nhv=1 ses=7000000f782cbe0
       hep=7000000e5f9ce10 flg=80 ld=1 ob=7000000e53207c8 ptr=700000099b3ef88 fex=700000099b3e298
      ----------------------------------------
...
PROCESS 70:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=34939 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f3e0f
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc176d20
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4784 efd 0 whr 5 slp 33075
       opr=2 pso=7000000ceb24778 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 73:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=24155 wait_time=0 seconds since wait started=0
                idn=651e7adb, value=125a00000000, where|sleeps=5000121e2
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000dc4eba08
       Mutex 7000000e5f9cd90(4698, 0) idn 651e7adb oper GET_SHRD
       Cursor Pin uid 4637 efd 0 whr 5 slp 8674
       opr=2 pso=7000000cef8dcb0 flg=0
       pcs=7000000e5f9cd90 nxt=0 flg=34 cld=1 hd=7000000dcea52a8 par=7000000e5f9d708
       ct=1 hsh=0 unp=0 unn=0 hvl=e5f9d098 nhv=1 ses=7000000f782cbe0
       hep=7000000e5f9ce10 flg=80 ld=1 ob=7000000e53207c8 ptr=700000099b3ef88 fex=700000099b3e298
      ----------------------------------------
...
PROCESS 76:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=35688 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f3ed4
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc655c80
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4806 efd 0 whr 5 slp 35673
       opr=2 pso=7000000ce702c90 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
PROCESS 142:
...
      waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=48159 wait_time=0 seconds since wait started=0
                  idn=16a1ebe6, value=132e00000000, where|sleeps=5002499ac
...
        ----------------------------------------
        KGX Atomic Operation Log 7000000db235510
         Mutex 7000000d71fd6b0(4910, 0) idn 16a1ebe6 oper GET_SHRD
         Cursor Pin uid 4592 efd 0 whr 5 slp 48111
         opr=2 pso=7000000e2252830 flg=0
         pcs=7000000d71fd6b0 nxt=0 flg=35 cld=0 hd=7000000fda5fc00 par=7000000d71fdaa0
         ct=0 hsh=0 unp=0 unn=0 hvl=d71fdd78 nhv=1 ses=7000000f78b5cc0
         hep=7000000d71fd730 flg=80 ld=1 ob=7000000d76d3848 ptr=70000008a8ff478 fex=70000008a8fe788
        ----------------------------------------
...


 Comments   
Comment by ubTools Support [ 07/Jun/08 05:46 PM ]
Mutex identifier value helps to locate address of mutex. For example: 
PROCESS 23:
...
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=42033 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f3271
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000d44f4280
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4939 efd 0 whr 5 slp 44251
       opr=2 pso=7000000cefa5df0 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------

The mutex identifier 0xec048ba at the address 0x7000000d92bce40 is requested in the shared mode (GET_SHRD)

Comment by ubTools Support [ 07/Jun/08 06:11 PM ]
According to SYSTEMSTATE dump, the following table shows the which process is waiting for the which process:
Waiter Process# Holder Process#
23 33
33 33
34 33
39 33
47 54
53 54
54 33
55 54
62 33
65 62
68 33
70 33
73 68
76 33
142 54

According to the table above, there is a deadlock and the root holder is the process#33. This process waits for itself. That means there is a self-deadlock problem.

Comment by ubTools Support [ 07/Jun/08 06:25 PM ]
Process#33 state: 
PROCESS 33:
...
    ----------------------------------------
    SO: 7000000f78e0770, type: 4, owner: 7000000fa8bbcf8, flag: INIT/-/-/0x00
    (session) sid: 4976 trans: 7000000f10ce318, creator: 7000000fa8bbcf8, flag: (8100041) USR/- BSY/-/-/-/-/-
              DID: 0001-0021-000193D1, short-term DID: 0000-0000-00000000
              txn branch: 0
              oct: 3, prv: 0, sql: 7000000fc179fa8, psql: 7000000fc68f018, user: 0/SYS
    O/S info: user: orapaky0, term: , ospid: 5099938, machine: akmenkulp2
              program: sqlplus@akmenkulp2 (TNS V1-V3)
    application name: sqlplus@akmenkulp2 (TNS V1-V3), hash value=0
    waiting for 'cursor: pin S wait on X' blocking sess=0x0 seq=27479 wait_time=0 seconds since wait started=0
                idn=ec048ba, value=137000000000, where|sleeps=5007f33be
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc64adb8
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper GET_SHRD
       Cursor Pin uid 4976 efd 0 whr 5 slp 15527
       opr=2 pso=7000000d86f7d88 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...
      ----------------------------------------
      KGX Atomic Operation Log 7000000fc64ad80
       Mutex 7000000d92bce40(4976, 0) idn ec048ba oper EXCL
       Cursor Pin uid 4976 efd 0 whr 1 slp 0
       opr=3 pso=7000000cee2b2c0 flg=0
       pcs=7000000d92bce40 nxt=7000000cb6ed710 flg=35 cld=0 hd=7000000fc8611f0 par=7000000d94637a0
       ct=4 hsh=0 unp=0 unn=0 hvl=cb6eda00 nhv=1 ses=7000000f78e0770
       hep=7000000d92bcec0 flg=80 ld=1 ob=7000000d9c1b3a8 ptr=7000000991e6108 fex=7000000991e5418
      ----------------------------------------
...

Process#33 holds mutex identifier 0xec048ba in the exclusive mode. But, it requests the same identifier in the shared mode. It's self-deadlock bug.

Comment by ubTools Support [ 07/Jun/08 06:39 PM ]
Unfortunately, there is no stack trace of process#33 to find the kernel function in which it's was running. But, the following SQL ran by process#33 helps to narrow down the Oracle bugs: 
      LIBRARY OBJECT HANDLE: handle=7000000fc179fa8 mtx=7000000fc17a0d8(1) cdp=1
      name=
select i.obj#, i.rowcnt, i.leafcnt, i.distkey, i.lblkkey, i.dblkkey,i.clufac, i.blevel
, i.analyzetime, i.samplesize, decode(i.pctthres$,null,null,mod(trunc(i.pctthres$/256),256)),
 i.flags, ist.cachedblk, ist.cachehit, ist.logicalread from ind$ i, ind_stats$ ist
 where i.obj# = ist.obj#(+) and i.bo#=:1 order by i.obj#
      hash=25d75620e6d3487e18921ac30ec048ba timestamp=06-06-2008 23:01:28
...

Looks like a statistic collection SQL...

Comment by ubTools Support [ 07/Jun/08 06:44 PM ]
Oracle Note:5907779.8: 
This problem is introduced in 10.2.0.3 

A process may hang with a self deadlock typically when executing 
DBMS_STATS. The hung process shows itself waiting on a
"cursor: pin S wait on X" waitevent waiting for an object
that it has pinned itself.

According to the note, this problem has been fixed in Oracle 10.2.0.4.

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