Follow up - I re-read the thread from 4 years back.
The auditmanager.nsf db is FTIndexed but I don't see that the indexer is doing any up updates routinely and never linked to a crash. I have deleted the FTI just in case.
There don't seem to be any major agent runs associated with the crashes. The log file shows a variety of events just prior to the lockup and none of events seem to be linked to AM.nsf.
Updall runs at 2 am; lockups seem to happen between 3 and 8 am most often.
Here is the console log output for the most recent lockup.
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer is indexing Database 'Dev\CPCRRelRevAE.nsf'
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer finished indexing Database 'Dev\CPCRRelRevAE.nsf'
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer is indexing Database 'Kmc2\Cascade\Processes\Archives\CascadeCRDn.NSF'
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer finished indexing Database 'Kmc2\Cascade\Processes\Archives\CascadeCRDn.NSF'
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer is indexing Database 'Dev\CMArc.nsf'
[09D4:0005-106C] 08/21/2015 03:25:36 AM Domain Indexer finished indexing Database 'Dev\CMArc.nsf'
[0FB8:0057-0CA8] 08/21/2015 03:26:11 AM Opened session for George User/Kollsman (Release 8.5.3)
ti=“0028E7DE-85257EA8” sq=“00032267” THREAD [0FB8:0057-16CC] WAITING FOR WRITE LOCK ON FRWSEM 0x02B0 Zero-user database cache (@0BFE209C) (R=0,W=1,WRITER=2C7C:2CF0,1STREADER=0000:0000) FOR 30000 ms
ti=“0028E7E3-85257EA8” sq=“00032268” THREAD [0FB8:0043-1688] WAITING FOR WRITE LOCK ON FRWSEM 0x02B0 Zero-user database cache (@0BFE209C) (R=0,W=1,WRITER=2C7C:2CF0,1STREADER=0000:0000) FOR 30000 ms
ti=“0028E7E9-85257EA8” sq=“00032269” THREAD [1368:0002-1364] WAITING FOR READ LOCK ON FRWSEM 0x4245 open database queue semaphore (@0C380348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028E825-85257EA8” sq=“0003226B” THREAD [0764:000D-0D94] WAITING FOR READ LOCK ON FRWSEM 0x4245 open database queue semaphore (@080B0348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028E82E-85257EA8” sq=“0003226C” THREAD [1F44:0002-2FE4] WAITING FOR READ LOCK ON FRWSEM 0x4245 open database queue semaphore (@07EF0348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028EA19-85257EA8” sq=“0003226E” THREAD [09D4:0008-168C] WAITING FOR READ LOCK ON FRWSEM 0x4245 open database queue semaphore (@080B0348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028EA29-85257EA8” sq=“0003226F” THREAD [1218:0002-1294] WAITING FOR READ LOCK ON FRWSEM 0x4245 open database queue semaphore (@0CA70348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028EC05-85257EA8” sq=“00032270” THREAD [0FB8:0061-0D50] WAITING FOR WRITE LOCK ON FRWSEM 0x4245 open database queue semaphore (@0BFE0348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
ti=“0028EC54-85257EA8” sq=“00032271” THREAD [0FB8:0019-13C0] WAITING FOR WRITE LOCK ON FRWSEM 0x4245 open database queue semaphore (@0BFE0348) (R=0,W=1,WRITER=0FB8:16CC,1STREADER=0000:0000) FOR 30000 ms
LkMgr BEGIN Long Held Lock Dump ——————
[0FB8:0051-169C] Lock(Mode=IS * LockID(DB DB=D:\Domino\Data\auditmanager.nsf)) Waiters countNonIntentLocks = 0 countIntentLocks = 3, queuLength = 1
[0FB8:0051-169C] Req(Status=Granted Mode=IS Class=Commit Nest=0 Cnt=1(Hold - count should be 1)
[0FB8:0051-169C] Tran=0 Func=N/A dbopen.c:4836 [0FB8:0057-16CC])
[0FB8:0051-169C] rm_lkmgr_cpp:2070
[0FB8:0051-169C] rm_lkmgr_cpp:1306
[0FB8:0051-169C] nsfsem1_c:533
[0FB8:0051-169C] dbfileio_c:1045
[0FB8:0051-169C] ntlock_c:62
[0FB8:0051-169C] nsfsem3_c:2353
[0FB8:0051-169C] Req(Status=Converting Mode=IS CnvMode=X Class=Manual Nest=0 Cnt=2
[0FB8:0051-169C] Tran=0 Func=N/A m\lkmgr.cpp:159 [2C7C:0002-2CF0] Delay=0min)
[0FB8:0051-169C] rm_lkmgr_cpp:2070
[0FB8:0051-169C] rm_lkmgr_cpp:1306
[0FB8:0051-169C] nsfsem1_c:169
[0FB8:0051-169C] nsfsem1_c:139
[0FB8:0051-169C] LkMgr END Long Held Lock Dump ——————