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Internal Error Occurred at Condition 'Internal Error: 'tf->used_unitcnt >0'

Document Type | TroubleShooting

Category | Patch/Upgrade

Applicable Product Version | 6FS07

Document Number | TPATS017

 

Issue

An Internal Error occurs during the temp table drop process while collecting statistical information, and subsequently, the database shuts down.

 

Cause

During the execution of statistical information collection, a timing issue occurs when an attempt is made to return an invalid temporary segment (temp segment) again while releasing it. This causes the database to shut down to maintain consistency.
 
Partial Callstack
Thread 2 (Thread 0x7fe6d67c7700 (LWP 61418)):

#0  0x00007fe7e038885d in nanosleep () from /lib64/libc.so.6
#1  0x00007fe7e03886f4 in sleep () from /lib64/libc.so.6
#2  0x0000000000dbc016 in tb_system (cmdstring=0xdda4c60 <cmd> "/usr/bin/pstack 61153 >> /home/tibero/tibero6/instance/FANFANINFO2/tbsvr.callstack.61153 2>&1", ds=0x40e43c0 <debug_dstream>, kill_child=<optimized out>, timeout_in_sec=296) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/callstack.c:297
#3  callstack_dump_internal (ds=ds@entry=0x40e43c0 <debug_dstream>, tid=tid@entry=309, os_thr_id=os_thr_id@entry=61418, pid=pid@entry=61153, dump_dest_dir=dump_dest_dir@entry=0x0) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/callstack.c:440
#4  0x0000000000dbc55e in callstack_dump_ex (ds=0x40e43c0 <debug_dstream>, tid=309, tid@entry=-1, dump_dest_dir=dump_dest_dir@entry=0x0) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/callstack.c:472
#5  0x0000000000dba9c4 in tb_tracedump (tracedump_cause=tracedump_cause@entry=TRACEDUMP_ASSERT) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/tbsvr_tracedump.c:91
#6  0x000000000106cade in tb_assert_msg_detail (cond=cond@entry=0x2bf36c0 "tf->used_unitcnt > 0", argc=argc@entry=1, filename=filename@entry=0x2bee1bb "tx_temp_ts.c", line=line@entry=1829, func=func@entry=0x2be36b0 <__func__.63713> "temp_ts_free_ext") at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/minimal/tb_assert.c:115
#7  0x0000000001c92e5f in temp_ts_free_ext (temp_ts_id=temp_ts_id@entry=2, unitdba=2233, unitcnt=16, type=type@entry=TEMP_TYPE_GTEMP_TBL) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/tx/tx_temp_ts.c:1829
#8  0x0000000001c826af in ts_free_ext (cvlist=cvlist@entry=0x7fe6d67c6040, tsid=<optimized out>, extdba=2233, extsize=128, no_wait=no_wait@entry=0 '\000') at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/tx/tx_ts.c:1865
#9  0x0000000001c2e368 in tx_sgmt_remove_ext (embuf=embuf@entry=0x7fe7bea26760, emblk=emblk@entry=0x7fe798ff4000, ts_id=ts_id@entry=2) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/tx/tx_sgmt.c:2512
#10 0x0000000001c2ee41 in tx_sgmt_drop (ts_id=<optimized out>, shdrdba=2099, sgmt_id=17318, invalidate_l1c=invalidate_l1c@entry=0 '\000', no_assert=no_assert@entry=0 '\000') at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/tx/tx_sgmt.c:2755
#11 0x0000000001b955f8 in td_tsgmt_clear (tsgmt_dd=tsgmt_dd@entry=0x7fe7dfd2b8e8) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/td/td_tsgmt.c:189
#12 0x0000000001b958e8 in td_tsgmt_clear_all (sess_close=sess_close@entry=1 '\001') at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/td/td_tsgmt.c:213
#13 0x00000000018f6945 in so_sess_close (so=0x7fe7dc1dc218, sessid=309, flag=<optimized out>) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/sess/sess.c:646
#14 0x0000000000d828c1 in so_gc (id=309, so_list=0x7fe6e683bb18, marker=0x7fe7daac9130, scope=SO_SESS) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/so_cleanup.c:376
#15 0x00000000006069b1 in svr_wthr_main_internal (my_tid=309) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/body/tbsvr_wthr.c:1044
#16 0x0000000000d8b4dd in wthr_init (args=0x7fe6dfec8d08) at /home/chef/workspace/Build_centos_7-3/tibero6/src/tbsvr/frame/tbsvr_cthr.c:3327
#17 0x00007fe7e39e5ea5 in start_thread () from /lib64/libpthread.so.0
#18 0x00007fe7e03c18dd in clone () from /lib64/libc.so.6

 

Solutions

A patch that fixes the issue causing an Internal Error due to a timing issue during the temp table drop process in statistical information collection needs to be applied.
Note
Below is a list of patches preventing temp-related errors.
  • 279034: Fix for Internal Error occurring during temp table drop
  • 258195: Stability patch for temp tablespace consolidation
Caution
Apply the patches through technical support provided by TmaxTibero.