| From: | Kamigishi Rei <iijima(dot)yun(at)koumakan(dot)jp> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Peter Geoghegan <pg(at)bowt(dot)ie>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Subject: | Re: BUG #17245: Index corruption involving deduplicated entries |
| Date: | 2021-10-29 22:25:57 |
| Message-ID: | 8809ef6d-d247-5ca8-820d-b9daec61e818@koumakan.jp |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
On 30.10.2021 0:59, Andres Freund wrote:
> On 2021-10-29 14:30:48 -0700, Andres Freund wrote:
>> I think it's moot for now, because of the discovery that waldump for PRUNE
>> doesn't show records marked unused. I'll try to write a patch to change that.
>
> Attached the quick version.
Here are WAL archive entries related to page 540 of mediawiki.page, with
the patch applied:
# grep "rel 1663/19243/19560 blk 540" ~/waldump-everything.txt
rmgr: Heap len (rec/tot): 59/ 7939, tx: 2013796, lsn:
2/8DA7C498, prev 2/8DA7C470, desc: LOCK off 5: xid 2013796: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk
540 FPW
rmgr: Heap len (rec/tot): 98/ 98, tx: 2013796, lsn:
2/8DAAA0A0, prev 2/8DAA8548, desc: UPDATE off 5 xmax 2013796 flags 0x61
KEYS_UPDATED ; new off 22 xmax 2013796, blkref #0: rel 1663/19243/19560
blk 540
rmgr: Heap2 len (rec/tot): 56/ 56, tx: 0, lsn:
2/8DABF558, prev 2/8DABF528, desc: PRUNE latestRemovedXid 2013796
nredirected 0 ndead 1 nunused 0, dead: [5], blkref #0: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 54/ 54, tx: 2013798, lsn:
2/8DABF590, prev 2/8DABF558, desc: LOCK off 22: xid 2013798: flags 0x00
LOCK_ONLY EXCL_LOCK , blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 83/ 83, tx: 2013798, lsn:
2/8DABF5C8, prev 2/8DABF590, desc: HOT_UPDATE off 22 xmax 2013798 flags
0x60 ; new off 41 xmax 2013798, blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/8DACCBB0, prev 2/8DACCB88, desc: PRUNE latestRemovedXid 2013798
nredirected 1 ndead 0 nunused 0, redirected: [22->41], blkref #0: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 59/ 7939, tx: 2014289, lsn:
2/8DE8A460, prev 2/8DE8A438, desc: LOCK off 41: xid 2014289: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk
540 FPW
rmgr: Heap len (rec/tot): 99/ 99, tx: 2014289, lsn:
2/8DEB5250, prev 2/8DEB36D8, desc: UPDATE off 41 xmax 2014289 flags 0x60
KEYS_UPDATED ; new off 53 xmax 2014289, blkref #0: rel 1663/19243/19560
blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/8DEC0420, prev 2/8DEC03F0, desc: PRUNE latestRemovedXid 2014289
nredirected 0 ndead 1 nunused 1, unused: [41], dead: [22], blkref #0:
rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 54/ 54, tx: 2014291, lsn:
2/8DEC0460, prev 2/8DEC0420, desc: LOCK off 53: xid 2014291: flags 0x00
LOCK_ONLY EXCL_LOCK , blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 82/ 82, tx: 2014291, lsn:
2/8DEC0498, prev 2/8DEC0460, desc: HOT_UPDATE off 53 xmax 2014291 flags
0x60 ; new off 41 xmax 2014291, blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/8DED6A10, prev 2/8DED69E8, desc: PRUNE latestRemovedXid 2014291
nredirected 1 ndead 0 nunused 0, redirected: [53->41], blkref #0: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 59/ 7939, tx: 2014784, lsn:
2/8DFB15D0, prev 2/8DFB1598, desc: LOCK off 41: xid 2014784: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk
540 FPW
rmgr: Heap len (rec/tot): 100/ 100, tx: 2014784, lsn:
2/8DFDAD20, prev 2/8DFD9180, desc: UPDATE off 41 xmax 2014784 flags 0x60
KEYS_UPDATED ; new off 57 xmax 2014784, blkref #0: rel 1663/19243/19560
blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/8DFE5F90, prev 2/8DFE5F60, desc: PRUNE latestRemovedXid 2014784
nredirected 0 ndead 1 nunused 1, unused: [41], dead: [53], blkref #0:
rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 54/ 54, tx: 2014786, lsn:
2/8DFE5FD0, prev 2/8DFE5F90, desc: LOCK off 57: xid 2014786: flags 0x00
LOCK_ONLY EXCL_LOCK , blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 82/ 82, tx: 2014786, lsn:
2/8DFE6020, prev 2/8DFE5FD0, desc: HOT_UPDATE off 57 xmax 2014786 flags
0x60 ; new off 41 xmax 2014786, blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/8DFFA420, prev 2/8DFFA3F8, desc: PRUNE latestRemovedXid 2014786
nredirected 1 ndead 0 nunused 0, redirected: [57->41], blkref #0: rel
1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 53/ 7937, tx: 0, lsn:
2/90CEF528, prev 2/90CEF4E8, desc: VACUUM nunused 3, blkref #0: rel
1663/19243/19560 blk 540 FPW
rmgr: Heap2 len (rec/tot): 59/ 59, tx: 0, lsn:
2/90CF1448, prev 2/90CEF528, desc: VISIBLE cutoff xid 2014786 flags
0x01, blkref #0: rel 1663/19243/19560 fork vm blk 0, blkref #1: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 59/ 7943, tx: 2045060, lsn:
2/93FF90E8, prev 2/93FF90B0, desc: LOCK off 41: xid 2045060: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk
540 FPW
rmgr: Heap len (rec/tot): 99/ 99, tx: 2045060, lsn:
2/94026D80, prev 2/94025150, desc: UPDATE off 41 xmax 2045060 flags 0x61
KEYS_UPDATED ; new off 5 xmax 2045060, blkref #0: rel 1663/19243/19560
blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/94031F28, prev 2/94031EF8, desc: PRUNE latestRemovedXid 2045060
nredirected 0 ndead 1 nunused 1, unused: [41], dead: [57], blkref #0:
rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 54/ 54, tx: 2045062, lsn:
2/94031F68, prev 2/94031F28, desc: LOCK off 5: xid 2045062: flags 0x00
LOCK_ONLY EXCL_LOCK , blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 83/ 83, tx: 2045062, lsn:
2/94031FA0, prev 2/94031F68, desc: HOT_UPDATE off 5 xmax 2045062 flags
0x60 ; new off 22 xmax 2045062, blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 0, lsn:
2/94043C50, prev 2/94043C28, desc: PRUNE latestRemovedXid 2045062
nredirected 1 ndead 0 nunused 0, redirected: [5->22], blkref #0: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 73/ 8133, tx: 2065110, lsn:
2/97207F18, prev 2/97207EE0, desc: UPDATE off 8 xmax 2065110 flags 0x00
; new off 41 xmax 2065110, blkref #0: rel 1663/19243/19560 blk 540 FPW,
blkref #1: rel 1663/19243/19560 blk 318
rmgr: Heap2 len (rec/tot): 53/ 8109, tx: 0, lsn:
2/97ED2598, prev 2/97ED2558, desc: VACUUM nunused 1, blkref #0: rel
1663/19243/19560 blk 540 FPW
rmgr: Heap2 len (rec/tot): 59/ 59, tx: 0, lsn:
2/97ED4560, prev 2/97ED2598, desc: VISIBLE cutoff xid 2065110 flags
0x01, blkref #0: rel 1663/19243/19560 fork vm blk 0, blkref #1: rel
1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 59/ 8115, tx: 2085600, lsn:
2/A0165A70, prev 2/A0165A38, desc: LOCK off 22: xid 2085600: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk
540 FPW
rmgr: Heap len (rec/tot): 54/ 54, tx: 2085600, lsn:
2/A018E858, prev 2/A018D7D8, desc: LOCK off 22: xid 2085600: flags 0x00
LOCK_ONLY EXCL_LOCK KEYS_UPDATED , blkref #0: rel 1663/19243/19560 blk 540
rmgr: Heap len (rec/tot): 73/ 8237, tx: 2085600, lsn:
2/A018E890, prev 2/A018E858, desc: UPDATE off 22 xmax 2085600 flags 0x03
KEYS_UPDATED ; new off 21 xmax 2085600, blkref #0: rel 1663/19243/19560
blk 328 FPW, blkref #1: rel 1663/19243/19560 blk 540
rmgr: Heap2 len (rec/tot): 58/ 58, tx: 2085602, lsn:
2/A019DC20, prev 2/A019BC08, desc: PRUNE latestRemovedXid 2085600
nredirected 0 ndead 1 nunused 1, unused: [22], dead: [5], blkref #0: rel
1663/19243/19560 blk 540
--
K. R.
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