On Fri, 2016-03-11 at 17:24 +0100, Michael Paquier wrote: > On Fri, Mar 11, 2016 at 5:19 PM, Anastasia Lubennikova wrote: > > > > BTW, if you know a good way to corrupt index (and do it > > reproducible) I'd be > > very glad to see it. > You can use for example dd in non-truncate mode to corrupt on-disk > page data, say that for example: > dd if=/dev/random bs=8192 count=1 \ > seek=$BLOCK_ID of=base/$DBOID/$RELFILENODE \ > conv=notrunc I guess /dev/random is not very compatible with the "reproducible" requirement. I mean, it will reproducibly break the page, but pretty much completely, which is mostly what checksums are for.
You can actually pretty easily produce a test case by setting up streaming replication between servers running two different version of glibc.
I actually wrote a tool that spins up a pair of VMs using vagrant and then sets them up as streaming replica's using ansible. It provides a nice one liner to get a streaming replica test environment going and it will easily provide the cross glibc test case. Technically, though it belongs to Trip because I wrote it on company time. Let me see if I can open source a version of it later this week that way you can use it for testing.
