On 29/07/2019 11:39, Tom Hughes wrote:

and it then goes on to fetch the peer credentials:

24657 getsockopt(9, SOL_SOCKET, SO_PEERCRED, {pid=24656, uid=2067, gid=103}, [12]) = 0

while ppc64le fetches the socket low water mark:

4761  getsockopt(10, SOL_SOCKET, SO_SNDLOWAT, [1], [12->4]) = 0

after which it errors.

So it looks like some sort of bug with how postgres has been
built on ppc64le in fact.

Probably related to this on ppc64le:

[tomh@ppc64le-test ~][PROD]$ fgrep SO_PEERCRED /usr/include/**/*.h
/usr/include/asm-generic/socket.h:#define SO_PEERCRED   17
/usr/include/asm/socket.h:#define SO_PEERCRED   21
[tomh@ppc64le-test ~][PROD]$ fgrep SO_SNDLOWAT /usr/include/**/*.h
/usr/include/asm-generic/socket.h:#define SO_SNDLOWAT   19
/usr/include/asm/socket.h:#define SO_SNDLOWAT   17

versus x86_64:

rawhide [~] % fgrep SO_PEERCRED /usr/include/**/*.h
/usr/include/asm-generic/socket.h:#define SO_PEERCRED   17
rawhide [~] % fgrep SO_SNDLOWAT /usr/include/**/*.h
/usr/include/asm-generic/socket.h:#define SO_SNDLOWAT   19

so ppc64le has two different definitions of SO_PEERCRED and if
you get the wrong one it winds up as SO_SNDLOWAT instead.

Tom

--
Tom Hughes (t...@compton.nu)
http://compton.nu/
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