Dear Experts,

We are running on our PRD system our Z Report and the session was terminated with the following messages:
SM21:
BZ Y Unexpected return value 1 when calling up DbSlR
BY J Function ROLLBACK on connection R/3 failed
R3 9 error in DB rollback/SyFlush, return code 016384
Q0 2 Stop Workproc 4, PID 13828220
R4 7 Delete session 001 after error 023

We checked trace file thru SM50:
M Thu Nov 10 10:22ᛡ 2011
M *** WARNING => ThCheckReqInfo: req_info & DP_CANT_HANDLE_REQ
M *** ERROR => ThSysAdmMsg: ThAdmSend [thxxab.c 7598]
M *** WARNING => ThCheckReqInfo: req_info & DP_CANT_HANDLE_REQ
M *** ERROR => ThSysAdmMsg: ThAdmSend [thxxab.c 7598]
M *** WARNING => ThCheckReqInfo: req_info & DP_CANT_HANDLE_REQ
M *** ERROR => ThSysAdmMsg: ThAdmSend [thxxab.c 7598]
M
M Thu Nov 10 10:23:19 2011
M ***LOG US1=> Login, Wrong Password (TRHOFIADM ) [sign.c 4539]
A
A Thu Nov 10 10:54:10 2011
A WP has reached ABAP/heaplimit = 40894464 bytes
A
A Thu Nov 10 10:ȗ:28 2011
A *** ERROR => User HOTDSBC reached avail. heapsize = 1907 MB: see ST22 [abstor.c 17ȯ]
A *** ERROR => Increase ABAP/heap_area_total [abstor.c 1780]
A *** ERROR => heap memory WP0: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP1: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP2: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP3: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP4: 1907 MB [abstor.c 1784]
A *** ERROR => heap memory WP5: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP6: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP7: 0 MB [abstor.c 񎣸]
A *** ERROR => heap memory WP8: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP9: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP10: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WPǫ: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP12: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP13: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP14: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP15: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP16: 0 MB [abstor.c 쉸]
A *** ERROR => heap memory WP17: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP18: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP19: 0 MB [abstor.c 1784]
A *** ERROR => heap memory Wὔ: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP21: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP22: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP23: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP24: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP25: 0 MB [abstor.c 񎣸]
A *** ERROR => heap memory WP26: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP27: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP28: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP29: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP30: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP31: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP32: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP33: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP34: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP35: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP36: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP37:ŀ MB [abstor.c 1784]
A *** ERROR => heap memory WP38: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP39: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP40: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP41: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP42: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP43: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP44: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP45: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP46: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP47: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP48: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP49: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP50: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP51: 0 MB [abstor.c 17ȴ]
A *** ERROR => heap memory WP52: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP53: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP54: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP55: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP56: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP57: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP58: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP59: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP60: 0 MB [abstor.c 1ᗐ]
A *** ERROR => heap memory WP61: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP62: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP63: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WPȠ: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP65: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP66: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP67: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP68: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP69: 0 MB [abstor.c 쉸]
A *** ERROR => heap memory WP70: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP71: 0 MB [abstor.c 1784]
A *** ERROR => heap memory WP72: 0 MB [abstor.c 1784]
A
A Thu Nov 10 10:55:29 2011
A TH VERBOSE LEVEL FULL
A ** RABAX: level LEV_RX_PXA_RELEASE_MTX entered.
A ** RABAX: level LEV_RX_PXA_RELEASE_MTX completed.
A ** RABAX: level LEV_RX_COVERAGE_ANALYSER entered.
A ** RABAX: level LEV_RX_COVERAGE_ANALYSER completed.
A ** RABAX: level LEV_RX_SAVE_SHMLOCKS entered.
A ** RABAX: level LEV_RX_SAVE_SHMLOCKS completed.
A ** RABAX: level LEV_RX_RESET_SHMLOCKS entered.
A ** RABAX: level LEV_RX_RESET_SHMLOCKS completed.
A ** RABAX: level LEV_RX_ROLLBACK entered.
C *** ERROR => Call to DbSlRollbackDB6 while DBIF already active in DbSlExeReadDB6
[dbsldb6.c 5ɀ]
B ***LOG BZY=> unexpected return code 1 calling DbSlRollba [dbcon#11 @ 3127] [dbcon 3127 ]
B ***LOG BYJ=> database function ROLLBACK for connection R/3 failed [dbcon#11 @ 3130] [dbcon 잺 ]
B *** ERROR => DISTRIBUTED_TA_FAILED:
[dbcon.c 1694]
B 000: name = R/3, con_id = 000000000, state = ACTIVE , tx = NO , hc = NO , perm = YES,
B reco = NO , frco = NO , timeout = 000, con_max = 255, con_opt = 255, occ = NO
M ***LOG R39=> ThIRollBack, db_rollback ( 016384) [thxxhead.c 13737]
M in_ThErrHandle: 1
M *** ERROR => ThIRollBack: db_rollback (step 4, th_errno 18, action 2, level 1) [thxxhead.c 10633]
M ThResetEmMagic: reset em magic for T213/M0/I1
M
M Info for wp 4
M
M pid = 138282Ǵ
M severity = 0
M status = 0
M stat = WP_RUN
M waiting_for = NO_WAITING
M reqtype = DP_RQ_DIAWP
M act_reqtype = DP_RQ_DIAWP
M rq_info = 0
M tid = 213
M mode = 0
M len = 8
M rq_id = 44991
M rq_source = FROM_WP_CA
M last_tid =緕
M last_mode = 0
M semaphore = 0
M act_cs_count = 0
M csTrack = 0
M csTrackRwExcl = 0
M csTrackRwShrd = 0
M mode_cleaned_counter = 0
M control_flag = 1000000
M int_checked_resource(RFC) = 0
M *****************************************************************************
M *
M * LOCATION SAP-Server tstprd02_P01_80 on host tstprd02 (wp 4)
M * error ThIRollBack: db_rollback
M *
M * TIME Thu Nov 10 10:55:29 2011
M * RELEASE 700
M * COMPONENT Taskhandler
M * VERSION 1
M * RC 18
M * MODULE thxxhead.c
M * LINE 10853
M * COUNTER 7322
M *
M *****************************************************************************
M
M PfStatDisconnect: disconnect statistics
M Entering TH_CALLHOOKS
M ThCallHooks: call hook >SAP-Trace buffer write< for event BEFORE_DUMP
M TrThHookFunc: called for WP dump
M TrStopTrace: switch off Trace for this WP
M TrFlushTrace: flush the trace buffer to file
M ThGetTransId2: got trans id (spa) >4EBB13BB438B0B40E10080000A42000E< (32)
M TrSaveFile: file can be kept (12211979/16777216 Bytes)
M TrIResetErrorAction: reset all errors for action 0
M TrWriteBuffer: 152 Bytes for block buffer
M TrBuffFlush: wrote 149347 Bytes of buffer to file
M TrWriteBuffer: 72 Bytes of block trailer
M TrIResetErrorAction: reset all errors for action 1
M TrFiICheckIndex: check index SAP-Trace tracefile list at 7000003d030b820
M TrFiICheckIndex: check record in slot 0
M TrFiICheckIndex: check record in slot 1
M TrFiICheckIndex: check record in slot 2
.
.
.
.
.
.
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C *** ERROR => Call to DbSlDisconnectDB6 while DBIF already active in DbSlExeReadDB6

Kindly advise.

We are on AIX 6.1 DB297FP3