[pgpool-general: 6605] Re: Pgpool-II + hba + samenet = segfault in libc-2.24.so
Tatsuo Ishii
ishii at sraoss.co.jp
Fri Jun 21 16:10:51 JST 2019
Thank you for the report. It seems to be a ancient bug with handling
pool_hba.conf when "samenet" is used. Can you please try attached patch?
Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp
> Hello,
>
> We are grateful for anyone who can offer any insight into this issue.
>
> We have two Pgpool-II 4.0.5 nodes under debian setup as a failover
> cluster. There are two PostgreSQL servers in an active/standby
> configuration with streaming replication between them.
>
> We are using Debian Stretch 9.9 (4.9.0-9-amd64 #1 SMP Debian
> 4.9.168-1+deb9u3 (2019-06-16) x86_64 GNU/Linux) and libc6:amd64
> 2.24-11+deb9u4.
>
> If we enable the pool hba (enable_pool_hba = on) and the pool_hba.conf
> contains only ip addresses in the address column, all seems well.
>
> If we instead use 'samenet' for any of the pool_hba.conf entries, any
> attempts to run a query result in:
>
> psql -U infraweavers --host 192.168.13.17 --dbname draytonmanor -c
> 'select * from rides'
> psql: server closed the connection unexpectedly
> This probably means the server terminated abnormally
> before or while processing the request.
>
> Here is an excerpt from the log:
>
> Jun 20 11:54:10 dpbdc-pool-1 pgpool[25077]: [70-1] 2019-06-20
> 11:54:10: pid 25077: LOG: new connection received
> Jun 20 11:54:10 dpbdc-pool-1 pgpool[25077]: [70-2] 2019-06-20
> 11:54:10: pid 25077: DETAIL: connecting host=dpbdc-pg-hacks.cw.lab
> port=37500
> Jun 20 11:54:10 dpbdc-pool-1 pgpool[24949]: [67-1] 2019-06-20
> 11:54:10: pid 24949: WARNING: child process with pid: 25077 was
> terminated by segmentation fault
> Jun 20 11:54:10 dpbdc-pool-1 pgpool[24949]: [68-1] 2019-06-20
> 11:54:10: pid 24949: LOG: fork a new child process with pid: 25087
> Jun 20 11:54:10 dpbdc-pool-1 kernel: [75753.670723] pgpool[25077]:
> segfault at 0 ip 00007fb6a21a7cf5 sp 00007ffc71d384b0 error 4 in
> libc-2.24.so[7fb6a2171000+195000]
>
> Working HBA entries:
> host all postgres 192.168.13.0/24 md5
> host all infraweavers 192.168.13.0/24 md5
> host all pgpool 192.168.13.0/24 md5
>
> Broken:
> host all postgres 192.168.13.0/24 md5
> host all infraweavers samenet md5
> host all pgpool 192.168.13.0/24 md5
>
> This seems to be an issue for all attempts to run queries via pgpool,
> not just for the infraweavers user. It is also a problem when using
> trust as oppose to md5 authentication.
>
> pgpool.conf:
> listen_addresses = '*'
> port = 5432
> socket_dir = '/var/run/postgresql'
> listen_backlog_multiplier = 2
> serialize_accept = off
> pcp_listen_addresses = '*'
> pcp_port = 9898
> pcp_socket_dir = '/var/run/postgresql'
> backend_hostname0 = 'dpbdc-pg-1'
> backend_port0 = 5432
> backend_weight0 = 1
> backend_data_directory0 = '/var/lib/postgresql/9.5/main/'
> backend_flag0 = 'ALLOW_TO_FAILOVER'
> backend_hostname1 = 'dpbdc-pg-2'
> backend_port1 = 5432
> backend_weight1 = 1
> backend_data_directory1 = '/var/lib/postgresql/9.5/main/'
> backend_flag1 = 'ALLOW_TO_FAILOVER'
> enable_pool_hba = on
> pool_passwd = 'pool_passwd'
> authentication_timeout = 60
> allow_clear_text_frontend_auth = off
> ssl = off
> ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL'
> ssl_prefer_server_ciphers = off
> num_init_children = 32
> max_pool = 4
> child_life_time = 300
> child_max_connections = 0
> connection_life_time = 0
> client_idle_limit = 0
> log_destination = 'syslog'
> log_line_prefix = '%t: pid %p: ' # printf-style string to output at
> beginning of each log line.
> log_connections = on
> log_hostname = on
> log_statement = on
> log_per_node_statement = off
> log_client_messages = on
> log_standby_delay = 'none'
> syslog_facility = 'LOCAL0'
> syslog_ident = 'pgpool'
> pid_file_name = '/var/run/postgresql/pgpool.pid'
> logdir = '/var/log/postgresql'
> connection_cache = on
> reset_query_list = 'ABORT; DISCARD ALL'
> replication_mode = off
> replicate_select = off
> insert_lock = on
> replication_stop_on_mismatch = off
> failover_if_affected_tuples_mismatch = off
> load_balance_mode = off
> ignore_leading_white_space = on
> black_function_list = 'currval,lastval,nextval,setval'
> allow_sql_comments = off
> disable_load_balance_on_write = 'transaction'
> master_slave_mode = on
> master_slave_sub_mode = 'stream'
> delay_threshold = 0
> health_check_period = 3
> health_check_timeout = 20
> health_check_user = 'pgpool'
> health_check_max_retries = 0
> health_check_retry_delay = 1
> connect_timeout = 10000
> failover_on_backend_error = on
> detach_false_primary = off
> search_primary_node_timeout = 300
> recovery_timeout = 90
> client_idle_limit_in_recovery = 0
> use_watchdog = on
> ping_path = '/bin'
> wd_hostname = 'dpbdc-pool-1'
> wd_port = 9000
> wd_priority = 1
> wd_authkey = 'randomlyGeneratedKey'
> wd_ipc_socket_dir = '/var/run/postgresql'
> delegate_IP = '192.168.13.17'
> if_cmd_path = '/usr/bin'
> if_up_cmd = 'sudo /sbin/ip addr add 192.168.13.17/21 dev ens18 label
> ens18:0'
> if_down_cmd = 'sudo /sbin/ip addr del 192.168.13.17/21 dev ens18'
> arping_path = '/usr/bin'
> arping_cmd = 'sudo /usr/sbin/arping -U 192.168.13.17 -w 1'
> failover_when_quorum_exists = on
> failover_require_consensus = on
> allow_multiple_failover_requests_from_node = off
> wd_monitoring_interfaces_list = 'any'
> wd_lifecheck_method = 'query'
> wd_interval = 3
> wd_life_point = 3
> wd_lifecheck_query = 'SELECT 1'
> wd_lifecheck_dbname = 'postgres'
> wd_lifecheck_user = 'pgpool'
> wd_lifecheck_password = ''
> other_pgpool_hostname0 = 'dpbdc-pool-2'
> other_pgpool_port0 = 5432
> other_wd_port0 = 9000
> relcache_expire = 0
> relcache_size = 256
> check_temp_table = on
> check_unlogged_table = on
> memory_cache_enabled = off
>
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