The following bug has been logged on the website:
Bug reference: 13739
Logged by: Michael Robinson
Email address: michael@snupps.com
PostgreSQL version: 9.4.4
Operating system: Ubuntu 14.04
Description:
Three days ago, we started getting corrupted page pointer panics on a hot
standby replica (logs below).
The replica is running on a dedicated EC2 instance, and has been running
without any problems for several months. The build version is
9.4.4-1.pgdg14.04+1 from the apt repository, running on Ubuntu 14.04 Trusty.
The database is around 440GB, and is under constant moderate read-only load
(100-1000 queries per second).
There have been no issues with the master database, nor have there been any
database shutdowns other than the panics.
2015-10-24 14:16:46.489 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-24 14:16:46.490 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/254063; dead 11796080; left 1365037; right 3024097; btpo_xact
64542957; leaf 2456241; leafleft 11130443; leafright 1350594; topparent
4294967295
2015-10-26 04:51:40.530 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-26 04:51:40.530 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/254063; dead 9922828; left 2449142; right 3415026; btpo_xact
64982371; leaf 2290440; leafleft 5120238; leafright 1903321; topparent
4294967295
2015-10-26 10:24:02.613 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-26 10:24:02.613 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/401628; dead 2348571; left 2348281; right 2351431; btpo_xact
65010718; leaf 2348740; leafleft 2348434; leafright 2351568; topparent
4294967295
2015-10-26 15:19:01.151 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-26 15:19:01.151 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/254063; dead 5840652; left 8909980; right 4074914; btpo_xact
65065726; leaf 3644712; leafleft 5129511; leafright 2786892; topparent
4294967295
2015-10-26 15:23:28.954 UTC LOG: unexpected pageaddr FD0/8738C000 in log
segment 0000000100000FD0000000FD, offset 3719168
2015-10-26 15:26:03.937 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-26 15:26:03.937 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/254063; dead 5740451; left 9572720; right 1029949; btpo_xact
65067057; leaf 2948357; leafleft 5225678; leafright 805064; topparent
4294967295
2015-10-26 15:28:24.802 UTC LOG: unexpected pageaddr FD0/BBD18000 in log
segment 0000000100000FD100000027, offset 13729792
2015-10-26 21:20:00.019 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-26 21:20:00.019 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/401628; dead 2706485; left 2706197; right 2706779; btpo_xact
65166073; leaf 2706583; leafleft 2706465; leafright 2706652; topparent
4294967295
2015-10-27 08:43:54.211 UTC PANIC: corrupted page pointers: lower = 17,
upper = 0, special = 8176
2015-10-27 08:43:54.211 UTC CONTEXT: xlog redo unlink_page: rel
1663/16416/401628; dead 5287405; left 5287118; right 5287692; btpo_xact
65266215; leaf 5287560; leafleft 5287263; leafright 5287575; topparent
4294967295
