Re: [HACKERS] increasing the default WAL segment size

Hi,

2)Getting "Aborted (core dumped)"  error at the time of running pg_basebackup  , (this issue is only coming on Linux32 ,not on Linux64)
 we have  double check to confirm it .

Steps to reproduce on Linux32

===================
fetch the sources
apply both the patches
 ./configure --with-zlib   --enable-debug  --enable-cassert  --enable-depend --prefix=$PWD/edbpsql --with-openssl CFLAGS="-g -O0"; make all install
Performed initdb with switch "--wal-segsize 4"

Does the crash occur with only size 4?

Crash occurs for the value of "--wal-segsize " 1, 2, 4, 8  with stack details as below :

For value the value of "--wal-segsize " 16, 32, 64... (all multiple of 16)  we are getting "Segmentation fault" message as below:
[bin]$ ./pg_basebackup -v -D /tmp/slave16
Segmentation fault (core dumped)

and for all other values of "--wal-segsize " 3, 5, 7, 9, 10, 11, ... 15, 17, 18, ...  we are getting invalid message during "initdb":
[bin]$ ./initdb -D data1 --wal-segsize=17
initdb: Invalid WAL segment size 17

 

start the server
run pg_basebackup

[centos@tushar-centos bin]$ ./pg_basebackup -v -D /tmp/myslave
*** glibc detected *** ./pg_basebackup: free(): invalid pointer: 0x08da7f00 ***

[centos@tushar-centos bin]$

same scenario is working fine against HEAD (v10 ) on Linux32 [i.e no patch applied] 

[centos@tushar-centos bin]$ ./pg_basebackup --verbose -D /tmp/slave11
pg_basebackup: initiating base backup, waiting for checkpoint to complete
pg_basebackup: checkpoint completed
pg_basebackup: transaction log start point: 0/2800024 on timeline 1
pg_basebackup: starting background WAL receiver
pg_basebackup: transaction log end point: 0/28000E4
pg_basebackup: waiting for background process to finish streaming ...
pg_basebackup: base backup completed
[centos@tushar-centos bin]$

Just to confirm, was this done with configure flag --with-wal-segsize=4 ?

we also have configure with the option "--with-wal-segsize=4" and getting warning.
./configure --with-zlib   --enable-debug  --enable-cassert  --enable-depend --prefix=$PWD/inst --with-openssl CFLAGS="-g -O0" --with-wal-segsize=4

configure: WARNING: unrecognized options: --with-wal-segsize