故障诊断：ASM 莫名出现 GC 等待事件、ADG 的 MRP 进程 HANG 住

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit ProductionWith the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,Data Mining and Real Application Testing optionsORACLE_HOME = /u01/oracle/product/11.2.0System name:	AIX

oradebug setmypidoradebug unlimitoradebug hanganalyze 3oradebug dump systemstate 266

*** -03-31 20:09:59.453===============================================================================HANG ANALYSIS:  instances (db_name.oracle_sid): cdhtz_p780.cdhtz1  oradebug_node_dump_level: 3  os thread scheduling delay history: (sampling every 1.000000 secs)    0.000000 secs at [ 20:09:58 ]      NOTE: scheduling delay has not been sampled for 0.818740 secs    0.000000 secs from [ 20:09:54 - 20:09:59 ], 5 sec avg    0.000000 secs from [ 20:09:00 - 20:09:59 ], 1 min avg    0.000000 secs from [ 20:05:00 - 20:09:59 ], 5 min avg  vktm time drift history=============================================================================== Chains most likely to have caused the hang: [a] Chain 1 Signature: 'gc buffer busy release'<='buffer busy waits'     Chain 1 Signature Hash: 0xe473997a [b] Chain 2 Signature: 'parallel recovery slave next change'<='buffer busy waits'     Chain 2 Signature Hash: 0x16abd035 [c] Chain 3 Signature: 'gc buffer busy release'<='buffer busy waits'     Chain 3 Signature Hash: 0xe473997a ===============================================================================Non-intersecting chains: -------------------------------------------------------------------------------Chain 1:-------------------------------------------------------------------------------    Oracle session identified by:    {                instance: 1 (cdhtz_p780.cdhtz1)                   os id: 6226628              process id: 98, oracle@cdhtzrzdb1              session id: 255        session serial #: 451    }    is waiting for 'buffer busy waits' with wait info:    {                      p1: 'file#'=0x7                      p2: 'block#'=0x229d                      p3: 'class#'=0x62            time in wait: 0.944766 sec (last interval)            time in wait: 76 min 54 sec (total)           timeout after: never                 wait id: 135153                blocking: 0 sessions            wait history:              * time between current wait and wait #1: 0.000000 sec              1.       event: 'latch: cache buffers chains'                 time waited: 0.000017 sec                     wait id: 152253          p1: 'address'=0x7000103deef8f58                                              p2: 'number'=0xb1                                              p3: 'tries'=0x0              * time between wait #1 and #2: 0.000000 sec              2.       event: 'buffer busy waits'                 time waited: 4.345775 sec (last interval)                 time waited: 76 min 53 sec (total)                     wait id: 135153          p1: 'file#'=0x7                                              p2: 'block#'=0x229d                                              p3: 'class#'=0x62              * time between wait #2 and #3: 0.000000 sec              3.       event: 'latch: cache buffers chains'                 time waited: 0.000012 sec                     wait id: 152252          p1: 'address'=0x7000103deef8f58                                              p2: 'number'=0xb1                                              p3: 'tries'=0x0    }    and is blocked by => Oracle session identified by:    {                instance: 1 (cdhtz_p780.cdhtz1)                   os id: 5767982              process id: 77, oracle@cdhtzrzdb1 (PR0E)              session id: 633        session serial #: 51    }    which is waiting for 'gc buffer busy release' with wait info:    {                      p1: 'file#'=0x7                      p2: 'block#'=0x229d                      p3: 'class#'=0x62            time in wait: 0.923282 sec      heur. time in wait: 24 min 49 sec           timeout after: 0.076718 sec                 wait id: 258197465                blocking: 2 sessions            wait history:              * time between current wait and wait #1: 0.000021 sec              1.       event: 'gc buffer busy release'                 time waited: 1.000014 sec                     wait id: 258197464       p1: 'file#'=0x7                                              p2: 'block#'=0x229d                                              p3: 'class#'=0x62              * time between wait #1 and #2: 0.000012 sec              2.       event: 'gc buffer busy release'                 time waited: 1.000015 sec                     wait id: 258197463       p1: 'file#'=0x7                                              p2: 'block#'=0x229d                                              p3: 'class#'=0x62              * time between wait #2 and #3: 0.000021 sec              3.       event: 'gc buffer busy release'                 time waited: 1.000039 sec                     wait id: 258197462       p1: 'file#'=0x7                                              p2: 'block#'=0x229d                                              p3: 'class#'=0x62    } Chain 1 Signature: 'gc buffer busy release'<='buffer busy waits'Chain 1 Signature Hash: 0xe473997a------------------------------------------------------------------------------- -------------------------------------------------------------------------------Chain 2:-------------------------------------------------------------------------------    Oracle session identified by:    {                instance: 1 (cdhtz_p780.cdhtz1)                   os id: 5963976              process id: 89, oracle@cdhtzrzdb1              session id: 2148        session serial #: 1613    }    is waiting for 'buffer busy waits' with wait info:    {                      p1: 'file#'=0x3                      p2: 'block#'=0x80                      p3: 'class#'=0x11            time in wait: 67 min 44 sec           timeout after: never                 wait id: 2843                blocking: 0 sessions            wait history:              * time between current wait and wait #1: 0.000077 sec              1.       event: 'db file sequential read'                 time waited: 0.006262 sec                     wait id: 2842            p1: 'file#'=0x2                                              p2: 'block#'=0x2202                                              p3: 'blocks'=0x1              * time between wait #1 and #2: 0.000098 sec              2.       event: 'db file sequential read'                 time waited: 0.000507 sec                     wait id: 2841            p1: 'file#'=0x2                                              p2: 'block#'=0x21ea                                              p3: 'blocks'=0x1              * time between wait #2 and #3: 0.000066 sec              3.       event: 'db file sequential read'                 time waited: 0.000380 sec                     wait id: 2840            p1: 'file#'=0x2                                              p2: 'block#'=0x21e2                                              p3: 'blocks'=0x1    }    and is blocked by => Oracle session identified by:    {                instance: 1 (cdhtz_p780.cdhtz1)                   os id: 8127092              process id: 84, oracle@cdhtzrzdb1 (PR0L)              session id: 1516        session serial #: 37    }    which is waiting for 'parallel recovery slave next change' with wait info:    {            time in wait: 0.008511 sec      heur. time in wait: 76 min 57 sec           timeout after: 0.001489 sec                 wait id: 258195905                blocking: 1 session            wait history:              * time between current wait and wait #1: 0.000008 sec              1.       event: 'parallel recovery slave next change'                 time waited: 0.010020 sec                     wait id: 258195904                     * time between wait #1 and #2: 0.000004 sec              2.       event: 'parallel recovery slave next change'                 time waited: 0.010013 sec                     wait id: 258195903                     * time between wait #2 and #3: 0.000005 sec              3.       event: 'parallel recovery slave next change'                 time waited: 0.010016 sec                     wait id: 258195902           } Chain 2 Signature: 'parallel recovery slave next change'<='buffer busy waits'Chain 2 Signature Hash: 0x16abd035------------------------------------------------------------------------------- ===============================================================================Intersecting chains: -------------------------------------------------------------------------------Chain 3:-------------------------------------------------------------------------------    Oracle session identified by:    {                instance: 1 (cdhtz_p780.cdhtz1)                   os id: 3146372              process id: 92, oracle@cdhtzrzdb1              session id: 2524        session serial #: 391    }    is waiting for 'buffer busy waits' with wait info:    {                      p1: 'file#'=0x7                      p2: 'block#'=0x229d                      p3: 'class#'=0x62            time in wait: 7.613869 sec (last interval)            time in wait: 76 min 50 sec (total)           timeout after: never                 wait id: 109934                blocking: 0 sessions            wait history:              * time between current wait and wait #1: 0.000000 sec              1.       event: 'latch: cache buffers chains'                 time waited: 0.000003 sec                     wait id: 126021          p1: 'address'=0x7000103deef8f58                                              p2: 'number'=0xb1                                              p3: 'tries'=0x0              * time between wait #1 and #2: 0.000000 sec              2.       event: 'buffer busy waits'                 time waited: 3.531329 sec (last interval)                 time waited: 76 min 42 sec (total)                     wait id: 109934          p1: 'file#'=0x7                                              p2: 'block#'=0x229d                                              p3: 'class#'=0x62              * time between wait #2 and #3: 0.000000 sec              3.       event: 'latch: cache buffers chains'                 time waited: 0.000018 sec                     wait id: 126020          p1: 'address'=0x7000103deef8f58                                              p2: 'number'=0xb1                                              p3: 'tries'=0x0    }    and is blocked by 'instance: 1, os id: 5767982, session id: 633',    which is a member of 'Chain 1'. Chain 3 Signature: 'gc buffer busy release'<='buffer busy waits'Chain 3 Signature Hash: 0xe473997a-------------------------------------------------------------------------------

[oracle@www.cdhtz.com ]$ awk -f ~/rs/sql/ass1045.awk cdhtz_ora_5046602.trc
Starting Systemstate 1...............................................................................................Ass.Awk Version 1.0.45~~~~~~~~~~~~~~~~~~~~~~Source file : cdhtz_ora_5046602.trc
System State 1  (2025-03-31 20:10:07.375)~~~~~~~~~~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~1:                                     [DEAD] 2: waiting for 'pmon timer'            3: waiting for 'rdbms ipc message'     4: waiting for 'VKTM Logical Idle Wait' 5: waiting for 'rdbms ipc message'     6: waiting for 'DIAG idle wait'        7: waiting for 'rdbms ipc message'     8: waiting for 'PING'                  9: waiting for 'rdbms ipc message'     10: waiting for 'DIAG idle wait'        11: waiting for 'rdbms ipc message'     12: waiting for 'ges remote message'    13: waiting for 'gcs remote message'    14: waiting for 'gcs remote message'    15: waiting for 'rdbms ipc message'     16: waiting for 'GCR sleep'             17: waiting for 'rdbms ipc message'     18: waiting for 'rdbms ipc message'     19: waiting for 'rdbms ipc message'     20: waiting for 'rdbms ipc message'     21: waiting for 'rdbms ipc message'     22: waiting for 'rdbms ipc message'     23: waiting for 'smon timer'            24: waiting for 'rdbms ipc message'     25: waiting for 'rdbms ipc message'     26: waiting for 'ASM background timer'  27: waiting for 'rdbms ipc message'     28: waiting for 'rdbms ipc message'     29: waiting for 'RFS dispatch'          30: waiting for 'SQL*Net message from client' 31: waiting for 'wait for unread message on broadcast channel' 32: waiting for 'SQL*Net message from client' 33: waiting for 'rdbms ipc message'     34: waiting for 'rdbms ipc message'     35: waiting for 'rdbms ipc message'     36: waiting for 'class slave wait'      37: waiting for 'SQL*Net message from client' 38:                                     39: waiting for 'rdbms ipc message'     40: waiting for 'rdbms ipc message'     41: waiting for 'rdbms ipc message'     42: waiting for 'rdbms ipc message'     43: waiting for 'class slave wait'      44: waiting for 'rdbms ipc message'     45: waiting for 'rdbms ipc message'     46: waiting for 'SQL*Net message from client' 47: waiting for 'class slave wait'      48: waiting for 'class slave wait'      49:                                     50:                                     51: waiting for 'rdbms ipc message'     52: waiting for 'SQL*Net message from client' 53: waiting for 'RFS dispatch'          54: waiting for 'SQL*Net message from client' 55: waiting for 'SQL*Net message from client' 56: waiting for 'class slave wait'      57: waiting for 'MRP inactivation'      58: waiting for 'SQL*Net message from client' 59:                                     60: waiting for 'class slave wait'      61: waiting for 'parallel recovery slave next change' 62:                                     63: waiting for 'parallel recovery slave next change' 64: waiting for 'parallel recovery slave next change' 65: waiting for 'parallel recovery slave next change' 66: waiting for 'parallel recovery slave next change' 67: waiting for 'parallel recovery slave next change' 68: waiting for 'class slave wait'      69: waiting for 'class slave wait'      70: waiting for 'parallel recovery slave next change' 71: waiting for 'parallel recovery slave next change' 72: waiting for 'parallel recovery slave next change' 73: waiting for 'parallel recovery slave next change' 74: waiting for 'parallel recovery slave next change' 75: waiting for 'parallel recovery slave next change' 76: waiting for 'parallel recovery slave next change' 77: waiting for 'gc buffer busy release' 78: waiting for 'parallel recovery slave next change' 79: waiting for 'parallel recovery slave next change' 80: waiting for 'parallel recovery slave next change' 81: waiting for 'parallel recovery slave next change' 82: waiting for 'parallel recovery slave next change' 83: waiting for 'parallel recovery slave next change' 84: waiting for 'parallel recovery slave next change' 85: waiting for 'parallel recovery slave next change' 86: waiting for 'parallel recovery slave next change' 87: waiting for 'parallel recovery slave next change' 89: waiting for 'buffer busy waits' (0x3,0x80,0x11)[Buffer 0x00c00080]     Final Blocker: inst: 1, sid: 1516, ser: 3791:                                     92: waiting for 'buffer busy waits' (0x7,0x229d,0x62)[Buffer 0x01c0229d]     Final Blocker: inst: 1, sid: 633, ser: 5193: waiting for 'SQL*Net message from client' 96: waiting for 'direct path read'      97: waiting for 'SQL*Net message from client' 98: waiting for 'buffer busy waits' (0x7,0x229d,0x62)[Buffer 0x01c0229d]     Final Blocker: inst: 1, sid: 633, ser: 5199: waiting for 'direct path read'      
Blockers~~~~~~~~
        Above is a list of all the processes. If they are waiting for a resource        then it will be given in square brackets. Below is a summary of the        waited upon resources, together with the holder of that resource.        Notes:        ~~~~~         o A process id of '???' implies that the holder was not found in the           systemstate. (The holder may have released the resource before we           dumped the state object tree of the blocking process).         o Lines with 'Enqueue conversion' below can be ignored *unless*            other sessions are waiting on that resource too. For more, see            http://gbr30026.uk.oracle.com:81/Public/TOOLS/Ass.html#enqcnv)
                    Resource Holder State           Buffer 0x00c00080    ??? Blocker           Buffer 0x01c0229d    ??? Blocker
Warning: The following processes have multiple session state objects andmay not be properly represented above :    29:   53:                                                                  
Object Names~~~~~~~~~~~~Buffer 0x00c00080                                             Buffer 0x01c0229d                                             
Summary of Wait Events Seen (count>10)~~~~~~~~~~~~~~~~~~~~~~~~~~~  No wait events seen more than 10 times

ROCESS 77: PR0E  ----------------------------------------  SO: 0x7000103e48c42a0, type: 2, owner: 0x0, flag: INIT/-/-/0x00 if: 0x3 c: 0x3   proc=0x7000103e48c42a0, name=process, file=ksu.h LINE:12721 ID:, pg=0  (process) Oracle pid:77, ser:1, calls cur/top: 0x70001039b0808d0/0x70001039b0805f0            flags : (0x0) -            flags2: (0x30),  flags3: (0x10)             intr error: 0, call error: 0, sess error: 0, txn error 0            intr queue: empty    ksudlp FALSE at location: 0  (post info) last post received: 704768 0 2              last post received-location: ksl2.h LINE:2374 ID:kslpsr              last process to post me: 0x7000103ea81a930 1 6              last post sent: 0 0 160              last post sent-location: kcb2.h LINE:4243 ID:kcbzww              last process posted by me: 0x7000103ea829260 5 0    (latch info) wait_event=704768 bits=0x0    Process Group: DEFAULT, pseudo proc: 0x7000103e29af078    O/S info: user: oracle, term: UNKNOWN, ospid: 5767982     OSD pid info: Unix process pid: 5767982, image: oracle@jklcrzdb1 (PR0E)    Short stack dump: ksedsts()+240<-ksdxfstk()+44<-ksdxcb()+3432<-sspuser()+116<-__sighandler()<-thread_wait()+580<-sskgpwwait()+32<-skgpwwait()+180<-ksliwat()+10772<-kslwaitctx()+180<-kslwait()+112<-kclwlr()+644<-kcbzfc()+2708<-kcbr_media_apply()+1888<-krp_slave_apply()+344<-krp_slave_main()+1092<-ksvrdp()+1804<-opirip()+724<-opidrv()+608<-sou2o()+136<-opimai_real()+188<-ssthrdmain()+276<-main()+204<-__start()+112    ----------------------------------------    SO: 0x7000103eaaf1038, type: 4, owner: 0x7000103e48c42a0, flag: INIT/-/-/0x00 if: 0x3 c: 0x3     proc=0x7000103e48c42a0, name=session, file=ksu.h LINE:12729 ID:, pg=0    (session) sid: 633 ser: 51 trans: 0x0, creator: 0x7000103e48c42a0              flags: (0x41) USR/- flags_idl: (0x1) BSY/-/-/-/-/-              flags2: (0x2080409) -/-/INC              DID: , short-term DID:               txn branch: 0x0              edition#: 0              oct: 0, prv: 0, sql: 0x0, psql: 0x0, user: 0/SYS    ksuxds FALSE at location: 0    service name: SYS$USERS    client details:      O/S info: user: oracle, term: UNKNOWN, ospid: 5767982      machine: jklcrzdb1 program: oracle@jklcrzdb1 (PR0E)    Current Wait Stack:     0: waiting for 'gc buffer busy release'        file#=0x7, block#=0x229d, class#=0x62        wait_id=258197477 seq_num=55118 snap_id=1        wait times: snap=0.007627 sec, exc=0.007627 sec, total=0.007627 sec        wait times: max=1.000000 sec, heur=24 min 59 sec        wait counts: calls=1 os=1        in_wait=1 iflags=0x5a8    There are 2 sessions blocked by this session.    Dumping one waiter:      inst: 1, sid: 255, ser: 451      wait event: 'buffer busy waits'        p1: 'file#'=0x7        p2: 'block#'=0x229d        p3: 'class#'=0x62      row_wait_obj#: 4294967295, block#: 0, row#: 0, file# 0      min_blocked_time: 2404 secs, waiter_cache_ver: 27635    Wait State:      fixed_waits=0 flags=0x22 boundary=0x0/-1

     proc=0x7000103ea8281b8, name=call, file=ksu.h LINE:12725 ID:, pg=0    (call) sess: cur 7000103f8ec4eb0, rec 0, usr 7000103f8ec4eb0; flg:20 fl2:1; depth:0    svpt(xcb:0x0 sptn:0x4286 uba: 0x00000000.0000.00)    ksudlc FALSE at location: 0      ----------------------------------------      SO: 0x7000103d4e2c040, type: 38, owner: 0x70001039b096df0, flag: INIT/-/-/0xc0 if: 0x1 c: 0x1       proc=0x7000103ea8281b8, name=buffer handle, file=kcb2.h LINE:2761 ID:, pg=0      (buffer) (CR) PR: 0x7000103ea8281b8 FLG: 0x0      lock rls: 0x700010029dc27d8, class bit: 0x0       cr[0]:       sh[0]:      kcbbfbp: [BH: 0x700010029dc27d8, LINK: 0x7000103d4e2c0c0] (WAITING)      type: normal pin      where: ktuwh27: kturbk, why: 0      BH (0x700010029dc27d8) file#: 7 rdba: 0x01c0229d (7/8861) class: 98 ba: 0x70001002896e000        set: 62 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 0,0        dbwrid: 1 obj: -1 objn: -1 tsn: 2 afn: 7 hint: f        hash: [0x7000103e7d29d30,0x700010231e8cbf0] lru: [0x700010237e08048,0x700010117dcdec8]        lru-flags: on_auxiliary_list        ckptq: [NULL] fileq: [0x700010143e35aa8,0x700010237e07f68] objq: [0x700010143e35bb0,0x700010237e08070] objaq: [0x700010237e08080,0x700010117dcdf00]        use: [NULL] wait: [0x7000103d712cff0,0x7000103d4e2c0c0]        st: MEDIA_RCV md: NULL rsop: 0x700010394bdde40 tch: 1 le: 0x7000102f3ed7608 rlscn: 0x0bac.feaeaa51        flags: down_grade_lock only_sequential_access block_written_once        Waiting State Objects          ----------------------------------------          SO: 0x7000103d712cf70, type: 38, owner: 0x70001039b0a69c0, flag: INIT/-/-/0xc0 if: 0x1 c: 0x1           proc=0x7000103ea829260, name=buffer handle, file=kcb2.h LINE:2761 ID:, pg=0          (buffer) (CR) PR: 0x7000103ea829260 FLG: 0x0          lock rls: 0x700010029dc27d8, class bit: 0x0           cr[0]:           sh[0]:          kcbbfbp: [BH: 0x700010029dc27d8, LINK: 0x7000103d712cff0] (WAITING)          type: normal pin          where: ktuwh27: kturbk, why: 0          ----------------------------------------          SO: 0x7000103d4e2c040, type: 38, owner: 0x70001039b096df0, flag: INIT/-/-/0xc0 if: 0x1 c: 0x1           proc=0x7000103ea8281b8, name=buffer handle, file=kcb2.h LINE:2761 ID:, pg=0          (buffer) (CR) PR: 0x7000103ea8281b8 FLG: 0x0          lock rls: 0x700010029dc27d8, class bit: 0x0           cr[0]:           sh[0]:          kcbbfbp: [BH: 0x700010029dc27d8, LINK: 0x7000103d4e2c0c0] (WAITING)          type: normal pin          where: ktuwh27: kturbk, why: 0
GLOBAL CACHE ELEMENT DUMP (address: 0x7000102f3ed7608):  id1: 0x229d id2: 0x7 pkey: INVALID block: (7/8861)  lock: X rls: 0x7 acq: 0x0 latch: 10  flags: 0x20 fair: 255 recovery: 0 fpin: 'kclwh2'  bscn: 0xbac.feaeaa51 bctx: 0x0 write: 0 scan: 0x0   lcp: 0x0 lnk: [NULL] lch: [0x700010029dc2910,0x700010029dc2910]  seq: 1054 hist: 54 113 238 180 113 238 180 143:0 208 352 32 197 48 121 45 299  LIST OF BUFFERS LINKED TO THIS GLOBAL CACHE ELEMENT:    flg: 0x00280400 lflg: 0x4 state: MEDIA_RCV tsn: 2 tsh: 1      waiters: 2      addr: 0x700010029dc27d8 obj: INVALID cls: UNDO BLOCK bscn: 0xbac.feaeaa51        buffer tsn: 2 rdba: 0x01c0229d (7/8861)        scn: 0x0bac.feaeaa51 seq: 0x09 flg: 0x04 tail: 0xaa510209        frmt: 0x02 chkval: 0x3bf8 type: 0x02=KTU UNDO BLOCK

Bug 17695685  Hang in Active Dataguard Database  This note gives a brief overview of bug 17695685.  The content was last updated on: 17-DEC-2014 Click here for details of each of the sections below.Affects:                Product (Component)        Oracle Server (Rdbms)         Range of versions believed to be affected        Versions >= 11.2         Versions confirmed as being affected                • 11.2.0.4                 • 11.2.0.3         Platforms affected        Generic (all / most platforms affected) Fixed:                The fix for 17695685 is first included in                 • (None Specified)         Interim patches may be available for earlier versions - click here to check.         Symptoms:        Related To:                • Hang (Process Hang)                 • Waits for "gc buffer busy release"                 • Active Dataguard (ADG)                 • RAC (Real Application Clusters) / OPS                 • MRP process Description        This bug is only relevant when using Real Application Clusters (RAC)         Rediscovery:- There is hang in Active Dataguard Database (ADG)- MRP or its slave waits for a buffer with state: MEDIA_RCV For example a hanganalyze trace might show something like:  Oracle session identified by:    {                instance: 1 (dtcpcta.dtcpcta1)                   os id: 31520              process id: 82, oraclecolldtdbpr31 (PR0J)              session id: 982        session serial #: 1157    }    which is waiting for 'gc buffer busy release' with wait info:    {                      p1: 'file#'=0x3                      p2: 'block#'=0x1399a                      p3: 'class#'=0x1c            time in wait: 0.567673 sec      heur. time in wait: 40 min 7 sec           timeout after: 0.432327 sec                 wait id: 35008931                blocking: 2737 sessions             current sql: <none>             short stack:  ksedsts()+465<- ...   <-semtimedop()+10<-skgpwwait()+160<-ksliwat()+2022<-kslwaitctx()+163<-kslwait()+141   <-kclwlr()+535<-kcbzfc()+656<-kcbr_media_apply()+1782<-krp_slave_apply()+284<-krp_slave_main() GLOBAL CACHE ELEMENT DUMP (address: 0xf7e7c360):  id1: 0x1399a id2: 0x3 pkey: INVALID block: (3/80282)  lock: X rls: 0x7 acq: 0x0 latch: 3  flags: 0x20 fair: 255 recovery: 0 fpin: 'kclwh2' bscn: 0x2.3927d9d3 bctx: (nil) write: 0 scan: 0x0 lcp: (nil) lnk: [NULL] lch: [0x31f91f2b0,0x31f91f2b0]  seq: 89 hist: 54 113 238 180 113 238 180 113 238 180 113 238 180 113 238 180 113 238 180 113  LIST OF BUFFERS LINKED TO THIS GLOBAL CACHE ELEMENT:flg: 0x00280400 lflg: 0x8 state: MEDIA_RCV tsn: 2 tsh: 4  waiters: 4 - There are waiters for "Media Recovery" buffer