Already logging to debuglog.txt.
#0  0x00007f7403dedec7 in semop () from /lib/libc.so.6
#1  0x00007f7405b77d91 in PGSemaphoreLock (sema=0x7f73ff64bbf0, interruptOK=0 '\000') at pg_sema.c:421
#2  0x00007f7405bd4c37 in LWLockAcquireCommon (val=<optimized out>, valptr=<optimized out>, mode=<optimized out>, l=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/storage/lmgr/lwlock.c:626
#3  LWLockAcquireWithVar (l=0x7f70f2ab6780, valptr=<optimized out>, val=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/storage/lmgr/lwlock.c:478
#4  0x00007f7405a0e7c4 in WALInsertLockAcquire () at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/access/transam/xlog.c:1590
#5  XLogInsert (rmid=<optimized out>, info=<optimized out>, rdata=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/access/transam/xlog.c:1118
#6  0x00007f7405ab71a1 in nextval_internal (relid=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/commands/sequence.c:733
#7  0x00007f7405aecf58 in ExecMakeFunctionResultNoSets (fcache=0x7f74078f4860, econtext=0x7f74078f4670, isNull=<optimized out>, isDone=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execQual.c:2026
#8  0x00007f7405ae8b14 in ExecTargetList (isDone=<optimized out>, itemIsDone=<optimized out>, isnull=<optimized out>, values=<optimized out>, econtext=<optimized out>, targetlist=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execQual.c:5307
#9  ExecProject (projInfo=<optimized out>, isDone=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execQual.c:5522
#10 0x00007f7405b01af3 in ExecResult (node=0x7f74078f4560) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/nodeResult.c:155
#11 0x00007f7405ae8068 in ExecProcNode (node=0x7f74078f4560) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execProcnode.c:373
#12 0x00007f7405ae69f7 in ExecutePlan (dest=<optimized out>, direction=<optimized out>, numberTuples=<optimized out>, sendTuples=<optimized out>, operation=<optimized out>, planstate=<optimized out>, estate=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execMain.c:1490
#13 standard_ExecutorRun (queryDesc=0x7f7407844200, direction=-238935424, count=0) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/executor/execMain.c:319
#14 0x00007f7405be54e7 in PortalRunSelect (portal=0x7f74078f2440, forward=<optimized out>, count=0, dest=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/tcop/pquery.c:946
#15 0x00007f7405be6917 in PortalRun (portal=<optimized out>, count=<optimized out>, isTopLevel=<optimized out>, dest=<optimized out>, altdest=<optimized out>, completionTag=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/tcop/pquery.c:790
#16 0x00007f7405be49e8 in exec_execute_message (max_rows=140737249419904, portal_name=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/tcop/postgres.c:1957
#17 PostgresMain (argc=<optimized out>, argv=<optimized out>, dbname=0x7f740780a720 "nuxeo_db", username=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/tcop/postgres.c:4137
#18 0x00007f7405b8c0f5 in BackendRun (port=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/postmaster/postmaster.c:4164
#19 BackendStartup (port=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/postmaster/postmaster.c:3829
#20 ServerLoop () at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/postmaster/postmaster.c:1597
#21 PostmasterMain (argc=<optimized out>, argv=<optimized out>) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/postmaster/postmaster.c:1244
#22 0x00007f7405b1e474 in main (argc=5, argv=0x7f7407809910) at /tmp/buildd/postgresql-9.4-9.4.4/build/../src/backend/main/main.c:228
Detaching from program: /usr/lib/postgresql/9.4/bin/postgres, process 22207
