On Tue, Jul 12, 2022 8:49 AM Masahiko Sawada <[email protected]> wrote:
>
> I've attached an updated patch.
>
Hi,
I met a segmentation fault in test_decoding test after applying the patch for
master
branch. Attach the backtrace.
It happened when executing the following code because it tried to free a NULL
pointer (catchange_xip).
/* be tidy */
if (ondisk)
pfree(ondisk);
+ if (catchange_xip)
+ pfree(catchange_xip);
}
It seems to be related to configure option. I could reproduce it when using
`./configure --enable-debug`.
But I couldn't reproduce with `./configure --enable-debug CFLAGS="-Og -ggdb"`.
Regards,
Shi yu
#0 0x0000000000910333 in GetMemoryChunkContext (pointer=0x0) at
../../../../src/include/utils/memutils.h:129
#1 pfree (pointer=0x0) at mcxt.c:1177
#2 0x000000000078186b in SnapBuildSerialize (builder=0x1fd5e78, lsn=25719712)
at snapbuild.c:1792
#3 0x0000000000782797 in SnapBuildProcessRunningXacts (builder=0x1fd5e78,
lsn=25719712, running=0x27dfe50) at snapbuild.c:1199
#4 0x0000000000774273 in standby_decode (ctx=0x1fc3e08, buf=0x7ffd8c95b5d0) at
decode.c:346
#5 0x0000000000773ab3 in LogicalDecodingProcessRecord
(ctx=ctx@entry=0x1fc3e08, record=0x1fc41a0) at decode.c:119
#6 0x000000000077815d in pg_logical_slot_get_changes_guts (fcinfo=0x1fb5d88,
confirm=<optimized out>, binary=<optimized out>) at logicalfuncs.c:271
#7 0x000000000067b63d in ExecMakeTableFunctionResult (setexpr=0x1fb42e0,
econtext=0x1fb41b0, argContext=<optimized out>, expectedDesc=0x1fd7da8,
randomAccess=false)
at execSRF.c:234
#8 0x000000000068b76f in FunctionNext (node=node@entry=0x1fb3fa0) at
nodeFunctionscan.c:94
#9 0x000000000067be37 in ExecScanFetch (recheckMtd=0x68b450 <FunctionRecheck>,
accessMtd=0x68b470 <FunctionNext>, node=0x1fb3fa0) at execScan.c:133
#10 ExecScan (node=0x1fb3fa0, accessMtd=0x68b470 <FunctionNext>,
recheckMtd=0x68b450 <FunctionRecheck>) at execScan.c:199
#11 0x000000000067344b in ExecProcNode (node=0x1fb3fa0) at
../../../src/include/executor/executor.h:259
#12 ExecutePlan (execute_once=<optimized out>, dest=0x1fc02e8,
direction=<optimized out>, numberTuples=0, sendTuples=<optimized out>,
operation=CMD_SELECT,
use_parallel_mode=<optimized out>, planstate=0x1fb3fa0, estate=0x1fb3d78)
at execMain.c:1636
#13 standard_ExecutorRun (queryDesc=0x1f9e178, direction=<optimized out>,
count=0, execute_once=<optimized out>) at execMain.c:363
#14 0x00000000007dda9e in PortalRunSelect (portal=0x1f51338, forward=<optimized
out>, count=0, dest=<optimized out>) at pquery.c:924
#15 0x00000000007decf7 in PortalRun (portal=portal@entry=0x1f51338,
count=count@entry=9223372036854775807, isTopLevel=isTopLevel@entry=true,
run_once=run_once@entry=true, dest=dest@entry=0x1fc02e8,
altdest=altdest@entry=0x1fc02e8, qc=0x7ffd8c95bbf0) at pquery.c:768
#16 0x00000000007db4ff in exec_simple_query (
query_string=0x1ee29a8 "SELECT data FROM
pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts',
'1', 'include-xids', '0');")
at postgres.c:1243
#17 0x00000000007dc742 in PostgresMain (dbname=<optimized out>,
username=<optimized out>) at postgres.c:4482
#18 0x000000000076132b in BackendRun (port=<optimized out>, port=<optimized
out>) at postmaster.c:4503
#19 BackendStartup (port=<optimized out>) at postmaster.c:4231
#20 ServerLoop () at postmaster.c:1805
#21 0x00000000007621fb in PostmasterMain (argc=argc@entry=3,
argv=argv@entry=0x1edbf20) at postmaster.c:1477
#22 0x00000000004f0f69 in main (argc=3, argv=0x1edbf20) at main.c:202
