Re: BUG #16665: Segmentation fault

The problem is that I don't know how to make it fails.

I know that on my production server it fails randomly every two days.

Would it help more if I tried to get a backtrace with `bt full` rather than just `bt` like I did with the previous one?

I'm not sure how to move this forwad further.

> On Tuesday, Oct 13, 2020 at 12:38 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
>
>
> út 13. 10. 2020 v 5:31 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > Thanks for the issue, that is spot on.
> > So it looks like I won't be able to get a debug image for docker.
> >
> > I have one question though. The core dump came from postgres 13.0 built for alpine. Would I be able to debug it, if I got postgres 13.0 on my macOS with the debug symbols and tried to debug on my local machine? Those binaries are different but come from the same version of postgres, would that work?
> >
>
> You cannot use binaries for docker for macOS. But if your application fails inside the image, then probably it fails on macOS too.
>
> Regards
>
> Pavel
> >
> >
> > > On Sunday, Oct 11, 2020 at 4:13 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > >
> > >
> > > ne 11. 10. 2020 v 8:54 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > > > I'm not sure how to install debug symbols for Postgres, if you point me to the right resource, I can read it.
> > >
> > > it is a separate package - it has no relation to Postgres configuration.
> > >
> > > maybe this thread is related https://github.com/docker-library/postgres/issues/666
> > >
> > > Pavel
> > >
> > > >
> > > > Here is my full configuration file. I haven't changed so many values
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # FILE LOCATIONS
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # The default values of these variables are driven from the -D command-line
> > > > # option or PGDATA environment variable, represented here as ConfigDir.
> > > >
> > > > #data_directory = 'ConfigDir' # use data in another directory
> > > > # (change requires restart)
> > > > #hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file
> > > > # (change requires restart)
> > > > #ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file
> > > > # (change requires restart)
> > > >
> > > > # If external_pid_file is not explicitly set, no extra PID file is written.
> > > > #external_pid_file = '' # write an extra PID file
> > > > # (change requires restart)
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # CONNECTIONS AND AUTHENTICATION
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Connection Settings -
> > > >
> > > > listen_addresses = '*'
> > > > # comma-separated list of addresses;
> > > > # defaults to 'localhost'; use '*' for all
> > > > # (change requires restart)
> > > > #port = 5432 # (change requires restart)
> > > > max_connections = 300 # (change requires restart)
> > > > #superuser_reserved_connections = 3 # (change requires restart)
> > > > #unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories
> > > > # (change requires restart)
> > > > #unix_socket_group = '' # (change requires restart)
> > > > #unix_socket_permissions = 0777 # begin with 0 to use octal notation
> > > > # (change requires restart)
> > > > #bonjour = off # advertise server via Bonjour
> > > > # (change requires restart)
> > > > #bonjour_name = '' # defaults to the computer name
> > > > # (change requires restart)
> > > >
> > > > # - TCP settings -
> > > > # see "man tcp" for details
> > > >
> > > > #tcp_keepalives_idle = 0 # TCP_KEEPIDLE, in seconds;
> > > > # 0 selects the system default
> > > > #tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds;
> > > > # 0 selects the system default
> > > > #tcp_keepalives_count = 0 # TCP_KEEPCNT;
> > > > # 0 selects the system default
> > > > #tcp_user_timeout = 0 # TCP_USER_TIMEOUT, in milliseconds;
> > > > # 0 selects the system default
> > > >
> > > > # - Authentication -
> > > >
> > > > #authentication_timeout = 1min # 1s-600s
> > > > #password_encryption = md5 # md5 or scram-sha-256
> > > > #db_user_namespace = off
> > > >
> > > > # GSSAPI using Kerberos
> > > > #krb_server_keyfile = ''
> > > > #krb_caseins_users = off
> > > >
> > > > # - SSL -
> > > >
> > > > #ssl = off
> > > > #ssl_ca_file = ''
> > > > #ssl_cert_file = 'server.crt'
> > > > #ssl_crl_file = ''
> > > > #ssl_key_file = 'server.key'
> > > > #ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
> > > > #ssl_prefer_server_ciphers = on
> > > > #ssl_ecdh_curve = 'prime256v1'
> > > > #ssl_min_protocol_version = 'TLSv1.2'
> > > > #ssl_max_protocol_version = ''
> > > > #ssl_dh_params_file = ''
> > > > #ssl_passphrase_command = ''
> > > > #ssl_passphrase_command_supports_reload = off
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # RESOURCE USAGE (except WAL)
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Memory -
> > > >
> > > > shared_buffers = 8GB # min 128kB
> > > > # (change requires restart)
> > > > #huge_pages = try # on, off, or try
> > > > # (change requires restart)
> > > > #temp_buffers = 8MB # min 800kB
> > > > #max_prepared_transactions = 0 # zero disables the feature
> > > > # (change requires restart)
> > > > # Caution: it is not advisable to set max_prepared_transactions nonzero unless
> > > > # you actively intend to use prepared transactions.
> > > > work_mem = 64MB # min 64kB
> > > > #hash_mem_multiplier = 1.0 # 1-1000.0 multiplier on hash table work_mem
> > > > maintenance_work_mem = 2GB # min 1MB
> > > > #autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem
> > > > #logical_decoding_work_mem = 64MB # min 64kB
> > > > #max_stack_depth = 2MB # min 100kB
> > > > #shared_memory_type = mmap # the default is the first option
> > > > # supported by the operating system:
> > > > # mmap
> > > > # sysv
> > > > # windows
> > > > # (change requires restart)
> > > > dynamic_shared_memory_type = posix # the default is the first option
> > > > # supported by the operating system:
> > > > # posix
> > > > # sysv
> > > > # windows
> > > > # mmap
> > > > # (change requires restart)
> > > >
> > > > # - Disk -
> > > >
> > > > #temp_file_limit = -1 # limits per-process temp file space
> > > > # in kilobytes, or -1 for no limit
> > > >
> > > > # - Kernel Resources -
> > > >
> > > > #max_files_per_process = 1000 # min 64
> > > > # (change requires restart)
> > > >
> > > > # - Cost-Based Vacuum Delay -
> > > >
> > > > #vacuum_cost_delay = 0 # 0-100 milliseconds (0 disables)
> > > > #vacuum_cost_page_hit = 1 # 0-10000 credits
> > > > #vacuum_cost_page_miss = 10 # 0-10000 credits
> > > > #vacuum_cost_page_dirty = 20 # 0-10000 credits
> > > > #vacuum_cost_limit = 200 # 1-10000 credits
> > > >
> > > > # - Background Writer -
> > > >
> > > > #bgwriter_delay = 200ms # 10-10000ms between rounds
> > > > #bgwriter_lru_maxpages = 100 # max buffers written/round, 0 disables
> > > > #bgwriter_lru_multiplier = 2.0 # 0-10.0 multiplier on buffers scanned/round
> > > > #bgwriter_flush_after = 512kB # measured in pages, 0 disables
> > > >
> > > > # - Asynchronous Behavior -
> > > >
> > > > effective_io_concurrency = 200 # 1-1000; 0 disables prefetching
> > > > #maintenance_io_concurrency = 10 # 1-1000; 0 disables prefetching
> > > > max_worker_processes = 16 # (change requires restart)
> > > > max_parallel_maintenance_workers = 4 # taken from max_parallel_workers
> > > > max_parallel_workers_per_gather = 4 # taken from max_parallel_workers
> > > > #parallel_leader_participation = on
> > > > max_parallel_workers = 16 # maximum number of max_worker_processes that
> > > > # can be used in parallel operations
> > > > #old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate
> > > > # (change requires restart)
> > > > #backend_flush_after = 0 # measured in pages, 0 disables
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # WRITE-AHEAD LOG
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Settings -
> > > >
> > > > #wal_level = replica # minimal, replica, or logical
> > > > # (change requires restart)
> > > > #fsync = on # flush data to disk for crash safety
> > > > # (turning this off can cause
> > > > # unrecoverable data corruption)
> > > > #synchronous_commit = on # synchronization level;
> > > > # off, local, remote_write, remote_apply, or on
> > > > #wal_sync_method = fsync # the default is the first option
> > > > # supported by the operating system:
> > > > # open_datasync
> > > > # fdatasync (default on Linux)
> > > > # fsync
> > > > # fsync_writethrough
> > > > # open_sync
> > > > #full_page_writes = on # recover from partial page writes
> > > > #wal_compression = off # enable compression of full-page writes
> > > > #wal_log_hints = off # also do full page writes of non-critical updates
> > > > # (change requires restart)
> > > > #wal_init_zero = on # zero-fill new WAL files
> > > > #wal_recycle = on # recycle WAL files
> > > > wal_buffers = 16MB # min 32kB, -1 sets based on shared_buffers
> > > > # (change requires restart)
> > > > #wal_writer_delay = 200ms # 1-10000 milliseconds
> > > > #wal_writer_flush_after = 1MB # measured in pages, 0 disables
> > > > #wal_skip_threshold = 2MB
> > > >
> > > > #commit_delay = 0 # range 0-100000, in microseconds
> > > > #commit_siblings = 5 # range 1-1000
> > > >
> > > > # - Checkpoints -
> > > >
> > > > #checkpoint_timeout = 5min # range 30s-1d
> > > > max_wal_size = 8GB
> > > > min_wal_size = 2GB
> > > > checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0
> > > > #checkpoint_flush_after = 256kB # measured in pages, 0 disables
> > > > #checkpoint_warning = 30s # 0 disables
> > > >
> > > > # - Archiving -
> > > >
> > > > #archive_mode = off # enables archiving; off, on, or always
> > > > # (change requires restart)
> > > > #archive_command = '' # command to use to archive a logfile segment
> > > > # placeholders: %p = path of file to archive
> > > > # %f = file name only
> > > > # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
> > > > #archive_timeout = 0 # force a logfile segment switch after this
> > > > # number of seconds; 0 disables
> > > >
> > > > # - Archive Recovery -
> > > >
> > > > # These are only used in recovery mode.
> > > >
> > > > #restore_command = '' # command to use to restore an archived logfile segment
> > > > # placeholders: %p = path of file to restore
> > > > # %f = file name only
> > > > # e.g. 'cp /mnt/server/archivedir/%f %p'
> > > > # (change requires restart)
> > > > #archive_cleanup_command = '' # command to execute at every restartpoint
> > > > #recovery_end_command = '' # command to execute at completion of recovery
> > > >
> > > > # - Recovery Target -
> > > >
> > > > # Set these only when performing a targeted recovery.
> > > >
> > > > #recovery_target = '' # 'immediate' to end recovery as soon as a
> > > > # consistent state is reached
> > > > # (change requires restart)
> > > > #recovery_target_name = '' # the named restore point to which recovery will proceed
> > > > # (change requires restart)
> > > > #recovery_target_time = '' # the time stamp up to which recovery will proceed
> > > > # (change requires restart)
> > > > #recovery_target_xid = '' # the transaction ID up to which recovery will proceed
> > > > # (change requires restart)
> > > > #recovery_target_lsn = '' # the WAL LSN up to which recovery will proceed
> > > > # (change requires restart)
> > > > #recovery_target_inclusive = on # Specifies whether to stop:
> > > > # just after the specified recovery target (on)
> > > > # just before the recovery target (off)
> > > > # (change requires restart)
> > > > #recovery_target_timeline = 'latest' # 'current', 'latest', or timeline ID
> > > > # (change requires restart)
> > > > #recovery_target_action = 'pause' # 'pause', 'promote', 'shutdown'
> > > > # (change requires restart)
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # REPLICATION
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Sending Servers -
> > > >
> > > > # Set these on the master and on any standby that will send replication data.
> > > >
> > > > #max_wal_senders = 10 # max number of walsender processes
> > > > # (change requires restart)
> > > > #wal_keep_size = 0 # in megabytes; 0 disables
> > > > #max_slot_wal_keep_size = -1 # in megabytes; -1 disables
> > > > #wal_sender_timeout = 60s # in milliseconds; 0 disables
> > > >
> > > > #max_replication_slots = 10 # max number of replication slots
> > > > # (change requires restart)
> > > > #track_commit_timestamp = off # collect timestamp of transaction commit
> > > > # (change requires restart)
> > > >
> > > > # - Master Server -
> > > >
> > > > # These settings are ignored on a standby server.
> > > >
> > > > #synchronous_standby_names = '' # standby servers that provide sync rep
> > > > # method to choose sync standbys, number of sync standbys,
> > > > # and comma-separated list of application_name
> > > > # from standby(s); '*' = all
> > > > #vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is delayed
> > > >
> > > > # - Standby Servers -
> > > >
> > > > # These settings are ignored on a master server.
> > > >
> > > > #primary_conninfo = '' # connection string to sending server
> > > > #primary_slot_name = '' # replication slot on sending server
> > > > #promote_trigger_file = '' # file name whose presence ends recovery
> > > > #hot_standby = on # "off" disallows queries during recovery
> > > > # (change requires restart)
> > > > #max_standby_archive_delay = 30s # max delay before canceling queries
> > > > # when reading WAL from archive;
> > > > # -1 allows indefinite delay
> > > > # (change requires restart)
> > > > #max_sync_workers_per_subscription = 2 # taken from max_logical_replication_workers
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # QUERY TUNING
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Planner Method Configuration -
> > > >
> > > > #enable_bitmapscan = on
> > > > #enable_hashagg = on
> > > > #enable_hashjoin = on
> > > > #enable_indexscan = on
> > > > #enable_indexonlyscan = on
> > > > #enable_material = on
> > > > #enable_mergejoin = on
> > > > #enable_nestloop = on
> > > > #enable_parallel_append = on
> > > > #enable_seqscan = on
> > > > #enable_sort = on
> > > > #enable_incremental_sort = on
> > > > #enable_tidscan = on
> > > > #enable_partitionwise_join = off
> > > > #enable_partitionwise_aggregate = off
> > > > #enable_parallel_hash = on
> > > > #enable_partition_pruning = on
> > > >
> > > > # - Planner Cost Constants -
> > > >
> > > > #seq_page_cost = 1.0 # measured on an arbitrary scale
> > > > random_page_cost = 1.1 # same scale as above
> > > > #cpu_tuple_cost = 0.01 # same scale as above
> > > > #cpu_index_tuple_cost = 0.005 # same scale as above
> > > > #cpu_operator_cost = 0.0025 # same scale as above
> > > > #parallel_tuple_cost = 0.1 # same scale as above
> > > > #parallel_setup_cost = 1000.0 # same scale as above
> > > >
> > > > #jit_above_cost = 100000 # perform JIT compilation if available
> > > > # and query more expensive than this;
> > > > # -1 disables
> > > > #jit_inline_above_cost = 500000 # inline small functions if query is
> > > > # more expensive than this; -1 disables
> > > > #jit_optimize_above_cost = 500000 # use expensive JIT optimizations if
> > > > # query is more expensive than this;
> > > > # -1 disables
> > > >
> > > > #min_parallel_table_scan_size = 8MB
> > > > #min_parallel_index_scan_size = 512kB
> > > > effective_cache_size = 24GB
> > > >
> > > > # - Genetic Query Optimizer -
> > > >
> > > > #geqo = on
> > > > #geqo_threshold = 12
> > > > #geqo_effort = 5 # range 1-10
> > > > #geqo_pool_size = 0 # selects default based on effort
> > > > #geqo_generations = 0 # selects default based on effort
> > > > #geqo_selection_bias = 2.0 # range 1.5-2.0
> > > > #geqo_seed = 0.0 # range 0.0-1.0
> > > >
> > > > # - Other Planner Options -
> > > >
> > > > #default_statistics_target = 100 # range 1-10000
> > > > #constraint_exclusion = partition # on, off, or partition
> > > > #cursor_tuple_fraction = 0.1 # range 0.0-1.0
> > > > #from_collapse_limit = 8
> > > > #join_collapse_limit = 8 # 1 disables collapsing of explicit
> > > > # JOIN clauses
> > > > #force_parallel_mode = off
> > > > #jit = on # allow JIT compilation
> > > > #plan_cache_mode = auto # auto, force_generic_plan or
> > > > # force_custom_plan
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # REPORTING AND LOGGING
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Where to Log -
> > > >
> > > > #log_destination = 'stderr' # Valid values are combinations of
> > > > # stderr, csvlog, syslog, and eventlog,
> > > > # depending on platform. csvlog
> > > > # requires logging_collector to be on.
> > > >
> > > > # This is used when logging to stderr:
> > > > #logging_collector = off # Enable capturing of stderr and csvlog
> > > > # into log files. Required to be on for
> > > > # csvlogs.
> > > > # (change requires restart)
> > > >
> > > > # These are only used if logging_collector is on:
> > > > #log_directory = 'log' # directory where log files are written,
> > > > # can be absolute or relative to PGDATA
> > > > #log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name pattern,
> > > > # can include strftime() escapes
> > > > #log_file_mode = 0600 # creation mode for log files,
> > > > # begin with 0 to use octal notation
> > > > #log_truncate_on_rotation = off # If on, an existing log file with the
> > > > # same name as the new log file will be
> > > > # truncated rather than appended to.
> > > > # But such truncation only occurs on
> > > > # time-driven rotation, not on restarts
> > > > # or size-driven rotation. Default is
> > > > # off, meaning append to existing files
> > > > # in all cases.
> > > > #log_rotation_age = 1d # Automatic rotation of logfiles will
> > > > # happen after that time. 0 disables.
> > > > #log_rotation_size = 10MB # Automatic rotation of logfiles will
> > > > # happen after that much log output.
> > > > # 0 disables.
> > > >
> > > > # These are relevant when logging to syslog:
> > > > #syslog_facility = 'LOCAL0'
> > > > #syslog_ident = 'postgres'
> > > > #syslog_sequence_numbers = on
> > > > #syslog_split_messages = on
> > > >
> > > > # This is only relevant when logging to eventlog (win32):
> > > > # (change requires restart)
> > > > #event_source = 'PostgreSQL'
> > > >
> > > > # - When to Log -
> > > >
> > > > #log_min_messages = warning # values in order of decreasing detail:
> > > > # debug5
> > > > # debug4
> > > > # debug3
> > > > # debug2
> > > > # debug1
> > > > # info
> > > > # notice
> > > > # warning
> > > > # error
> > > > # log
> > > > # fatal
> > > > # panic
> > > >
> > > > #log_min_error_statement = error # values in order of decreasing detail:
> > > > # debug5
> > > > # debug4
> > > > # debug3
> > > > # debug2
> > > > # debug1
> > > > # info
> > > > # notice
> > > > # warning
> > > > # error
> > > > # log
> > > > # fatal
> > > > # panic (effectively off)
> > > >
> > > > #log_min_duration_statement = -1 # -1 is disabled, 0 logs all statements
> > > > # and their durations, > 0 logs only
> > > > # statements running at least this number
> > > > # of milliseconds
> > > >
> > > > #log_min_duration_sample = -1 # -1 is disabled, 0 logs a sample of statements
> > > > # and their durations, > 0 logs only a sample of
> > > > # statements running at least this number
> > > > # of milliseconds;
> > > > # sample fraction is determined by log_statement_sample_rate
> > > >
> > > > #log_statement_sample_rate = 1.0 # fraction of logged statements exceeding
> > > > # log_min_duration_sample to be logged;
> > > > # 1.0 logs all such statements, 0.0 never logs
> > > >
> > > >
> > > > #log_transaction_sample_rate = 0.0 # fraction of transactions whose statements
> > > > # are logged regardless of their duration; 1.0 logs all
> > > > # statements from all transactions, 0.0 never logs
> > > >
> > > > # - What to Log -
> > > >
> > > > #debug_print_parse = off
> > > > #debug_print_rewritten = off
> > > > #debug_print_plan = off
> > > > #debug_pretty_print = on
> > > > #log_checkpoints = off
> > > > #log_connections = off
> > > > #log_disconnections = off
> > > > #log_duration = off
> > > > #log_error_verbosity = default # terse, default, or verbose messages
> > > > #log_hostname = off
> > > > #log_line_prefix = '%m [%p] ' # special values:
> > > > # %a = application name
> > > > # %u = user name
> > > > # %d = database name
> > > > # %r = remote host and port
> > > > # %h = remote host
> > > > # %b = backend type
> > > > # %p = process ID
> > > > # %t = timestamp without milliseconds
> > > > # %m = timestamp with milliseconds
> > > > # %n = timestamp with milliseconds (as a Unix epoch)
> > > > # %i = command tag
> > > > # %e = SQL state
> > > > # %c = session ID
> > > > # %l = session line number
> > > > # %s = session start timestamp
> > > > # %v = virtual transaction ID
> > > > # %x = transaction ID (0 if none)
> > > > # %q = stop here in non-session
> > > > # processes
> > > > # %% = '%'
> > > > # e.g. '<%u%%%d> '
> > > > #log_lock_waits = off # log lock waits >= deadlock_timeout
> > > > #log_parameter_max_length = -1 # when logging statements, limit logged
> > > > # bind-parameter values to N bytes;
> > > > # -1 means print in full, 0 disables
> > > > #log_parameter_max_length_on_error = 0 # when logging an error, limit logged
> > > > # bind-parameter values to N bytes;
> > > > # -1 means print in full, 0 disables
> > > > #log_statement = 'none' # none, ddl, mod, all
> > > > #log_replication_commands = off
> > > > #log_temp_files = -1 # log temporary files equal or larger
> > > > # than the specified size in kilobytes;
> > > > # -1 disables, 0 logs all temp files
> > > > log_timezone = 'UTC'
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # PROCESS TITLE
> > > > #------------------------------------------------------------------------------
> > > >
> > > > #cluster_name = '' # added to process titles if nonempty
> > > > # (change requires restart)
> > > > #update_process_title = on
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # STATISTICS
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Query and Index Statistics Collector -
> > > >
> > > > #track_activities = on
> > > > #track_counts = on
> > > > #track_io_timing = off
> > > > #track_functions = none # none, pl, all
> > > > #track_activity_query_size = 1024 # (change requires restart)
> > > > #stats_temp_directory = 'pg_stat_tmp'
> > > >
> > > >
> > > > # - Monitoring -
> > > >
> > > > #log_parser_stats = off
> > > > #log_planner_stats = off
> > > > #log_executor_stats = off
> > > > #log_statement_stats = off
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # AUTOVACUUM
> > > > #------------------------------------------------------------------------------
> > > >
> > > > #autovacuum = on # Enable autovacuum subprocess? 'on'
> > > > # requires track_counts to also be on.
> > > > #log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and
> > > > # their durations, > 0 logs only
> > > > # actions running at least this number
> > > > # of milliseconds.
> > > > #autovacuum_max_workers = 3 # max number of autovacuum subprocesses
> > > > # (change requires restart)
> > > > #autovacuum_naptime = 1min # time between autovacuum runs
> > > > #autovacuum_vacuum_threshold = 50 # min number of row updates before
> > > > # vacuum
> > > > #autovacuum_vacuum_insert_threshold = 1000 # min number of row inserts
> > > > # before vacuum; -1 disables insert
> > > > # vacuums
> > > > #autovacuum_analyze_threshold = 50 # min number of row updates before
> > > > # analyze
> > > > #autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before vacuum
> > > > #autovacuum_vacuum_insert_scale_factor = 0.2 # fraction of inserts over table
> > > > # size before insert vacuum
> > > > #autovacuum_analyze_scale_factor = 0.1 # fraction of table size before analyze
> > > > #autovacuum_freeze_max_age = 200000000 # maximum XID age before forced vacuum
> > > > # (change requires restart)
> > > > #autovacuum_multixact_freeze_max_age = 400000000 # maximum multixact age
> > > > # before forced vacuum
> > > > # (change requires restart)
> > > > #autovacuum_vacuum_cost_delay = 2ms # default vacuum cost delay for
> > > > # autovacuum, in milliseconds;
> > > > # -1 means use vacuum_cost_delay
> > > > #autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for
> > > > # autovacuum, -1 means use
> > > > # vacuum_cost_limit
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # CLIENT CONNECTION DEFAULTS
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Statement Behavior -
> > > >
> > > > #client_min_messages = notice # values in order of decreasing detail:
> > > > # debug5
> > > > # debug4
> > > > # debug3
> > > > # debug2
> > > > # debug1
> > > > # log
> > > > # notice
> > > > # warning
> > > > # error
> > > > #search_path = '"$user", public' # schema names
> > > > #row_security = on
> > > > #default_tablespace = '' # a tablespace name, '' uses the default
> > > > #temp_tablespaces = '' # a list of tablespace names, '' uses
> > > > # only default tablespace
> > > > #default_table_access_method = 'heap'
> > > > #check_function_bodies = on
> > > > #default_transaction_isolation = 'read committed'
> > > > #default_transaction_read_only = off
> > > > #default_transaction_deferrable = off
> > > > #session_replication_role = 'origin'
> > > > #statement_timeout = 0 # in milliseconds, 0 is disabled
> > > > #lock_timeout = 0 # in milliseconds, 0 is disabled
> > > > #idle_in_transaction_session_timeout = 0 # in milliseconds, 0 is disabled
> > > > #vacuum_freeze_min_age = 50000000
> > > > #vacuum_freeze_table_age = 150000000
> > > > #vacuum_multixact_freeze_min_age = 5000000
> > > > #vacuum_multixact_freeze_table_age = 150000000
> > > > #vacuum_cleanup_index_scale_factor = 0.1 # fraction of total number of tuples
> > > > # before index cleanup, 0 always performs
> > > > # index cleanup
> > > > #bytea_output = 'hex' # hex, escape
> > > > #xmlbinary = 'base64'
> > > > #xmloption = 'content'
> > > > #gin_fuzzy_search_limit = 0
> > > > #gin_pending_list_limit = 4MB
> > > >
> > > > # - Locale and Formatting -
> > > >
> > > > datestyle = 'iso, mdy'
> > > > #intervalstyle = 'postgres'
> > > > timezone = 'UTC'
> > > > #timezone_abbreviations = 'Default' # Select the set of available time zone
> > > > # abbreviations. Currently, there are
> > > > # Default
> > > > # Australia (historical usage)
> > > > # India
> > > > # You can create your own file in
> > > > # share/timezonesets/.
> > > > #extra_float_digits = 1 # min -15, max 3; any value >0 actually
> > > > # selects precise output mode
> > > > #client_encoding = sql_ascii # actually, defaults to database
> > > > # encoding
> > > >
> > > > # These settings are initialized by initdb, but they can be changed.
> > > > lc_messages = 'en_US.utf8' # locale for system error message
> > > > # strings
> > > > lc_monetary = 'en_US.utf8' # locale for monetary formatting
> > > > lc_numeric = 'en_US.utf8' # locale for number formatting
> > > > lc_time = 'en_US.utf8' # locale for time formatting
> > > >
> > > > # default configuration for text search
> > > > default_text_search_config = 'pg_catalog.english'
> > > >
> > > > # - Shared Library Preloading -
> > > >
> > > > #shared_preload_libraries = '' # (change requires restart)
> > > > shared_preload_libraries = 'pg_stat_statements'
> > > > pg_stat_statements.track = all
> > > > #local_preload_libraries = ''
> > > > #session_preload_libraries = ''
> > > > #jit_provider = 'llvmjit' # JIT library to use
> > > >
> > > > # - Other Defaults -
> > > >
> > > > #dynamic_library_path = '$libdir'
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # LOCK MANAGEMENT
> > > > #------------------------------------------------------------------------------
> > > >
> > > > #deadlock_timeout = 1s
> > > > #max_locks_per_transaction = 64 # min 10
> > > > # (change requires restart)
> > > > #max_pred_locks_per_transaction = 64 # min 10
> > > > # (change requires restart)
> > > > #max_pred_locks_per_relation = -2 # negative values mean
> > > > # (max_pred_locks_per_transaction
> > > > # / -max_pred_locks_per_relation) - 1
> > > > #max_pred_locks_per_page = 2 # min 0
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # VERSION AND PLATFORM COMPATIBILITY
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # - Previous PostgreSQL Versions -
> > > >
> > > > #array_nulls = on
> > > > #backslash_quote = safe_encoding # on, off, or safe_encoding
> > > > #escape_string_warning = on
> > > > #lo_compat_privileges = off
> > > > #operator_precedence_warning = off
> > > > #quote_all_identifiers = off
> > > > #standard_conforming_strings = on
> > > > #synchronize_seqscans = on
> > > >
> > > > # - Other Platforms and Clients -
> > > >
> > > > #transform_null_equals = off
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # ERROR HANDLING
> > > > #------------------------------------------------------------------------------
> > > >
> > > > #exit_on_error = off # terminate session on any error?
> > > > #restart_after_crash = on # reinitialize after backend crash?
> > > > #data_sync_retry = off # retry or panic on failure to fsync
> > > > # data?
> > > > # (change requires restart)
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # CONFIG FILE INCLUDES
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # These options allow settings to be loaded from files other than the
> > > > # default postgresql.conf. Note that these are directives, not variable
> > > > # assignments, so they can usefully be given more than once.
> > > >
> > > > #include_dir = '...' # include files ending in '.conf' from
> > > > # a directory, e.g., 'conf.d'
> > > > #include_if_exists = '...' # include file only if it exists
> > > > #include = '...' # include file
> > > >
> > > >
> > > > #------------------------------------------------------------------------------
> > > > # CUSTOMIZED OPTIONS
> > > > #------------------------------------------------------------------------------
> > > >
> > > > # Add settings for extensions here
> > > >
> > > >
> > > >
> > > > > On Sunday, Oct 11, 2020 at 2:37 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > > > >
> > > > >
> > > > > ne 11. 10. 2020 v 3:13 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > > > > > ok here is the backtrace that I got
> > > > > >
> > > > > > Let me know if you need anything else
> > > > >
> > > > > please, can you install debug symbols for Postgres. In this backtrace is not detail information.
> > > > >
> > > > > It's strange so Postgres crashes in LWLockAttemptLock
> > > > >
> > > > > Maybe there is problem in https://github.com/postgres/postgres/commit/bb16aba50c9492490a0b57e600a932798f45cd4f
> > > > >
> > > > > Do you use serializable level of transaction isolations?
> > > > >
> > > > >
> > > > >
> > > > > >
> > > > > > #0 0x0000556931d0ba55 in LWLockAttemptLock ()
> > > > > > #1 0x0000556931d0c537 in LWLockAcquire ()
> > > > > > #2 0x0000556931cefe83 in ReadBuffer_common ()
> > > > > > #3 0x0000556931cf0626 in ReadBufferExtended ()
> > > > > > #4 0x0000556931a8c9b0 in heapgetpage ()
> > > > > > #5 0x0000556931a8cf09 in heapgettup_pagemode ()
> > > > > > #6 0x0000556931a8de3e in heap_getnextslot ()
> > > > > > #7 0x0000556931bf27fe in SeqNext ()
> > > > > > #8 0x0000556931bd15b7 in ExecScan ()
> > > > > > #9 0x0000556931bf115f in ExecNestLoop ()
> > > > > > #10 0x0000556931bf115f in ExecNestLoop ()
> > > > > > #11 0x0000556931be1147 in ExecGather ()
> > > > > > #12 0x0000556931bc8a2b in standard_ExecutorRun ()
> > > > > > #13 0x00007f10dcb8d345 in pgss_ExecutorRun () from /usr/local/lib/postgresql/pg_stat_statements.so
> > > > > > #14 0x0000556931d1e41c in PortalRunSelect ()
> > > > > > #15 0x0000556931d1f5d6 in PortalRun ()
> > > > > > #16 0x0000556931d1cb58 in PostgresMain ()
> > > > > > #17 0x0000556931caa3d7 in ServerLoop ()
> > > > > > #18 0x0000556931cab333 in PostmasterMain ()
> > > > > > #19 0x0000556931a4db7c in main ()
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > > On Saturday, Oct 10, 2020 at 11:57 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > > > > > >
> > > > > > >
> > > > > > > so 10. 10. 2020 v 16:51 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > > > > > > > I'm not really sure how to read that binary file.
> > > > > > > >
> > > > > > > > I have uploaded to an s3 bucket and made it public.
> > > > > > > > Anyone should be able to access that file
> > > > > > > > https://s3.eu-central-1.wasabisys.com/union-backups/core_dump.gz
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > this is not good idea
> > > > > > >
> > > > > > > see https://stackoverflow.com/questions/5115613/core-dump-file-analysis
> > > > > > >
> > > > > > > Pavel
> > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > it's 2GB
> > > > > > > >
> > > > > > > > If you have a link to a documentation of how I can read that file and get the stacktrace, I would be glad to give it a read.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > > On Saturday, Oct 10, 2020 at 8:56 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > so 10. 10. 2020 v 13:27 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > > > > > > > > > Awesome, thank you!
> > > > > > > > > > It's the right thing.
> > > > > > > > > >
> > > > > > > > > > How do I share it?
> > > > > > > > >
> > > > > > > > > important is the backtrace
> > > > > > > > >
> > > > > > > > > paste it to mail
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > On Saturday, Oct 10, 2020 at 8:24 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > so 10. 10. 2020 v 13:19 odesílatel Raphael Megzari <raphael(at)megzari(dot)com (mailto:raphael(at)megzari(dot)com)> napsal:
> > > > > > > > > > > > Thank you for taking the time to have a look.
> > > > > > > > > > > >
> > > > > > > > > > > > I'm not sure how to enable core dump with the docker image.
> > > > > > > > > > > >
> > > > > > > > > > > > I've seen some documentation where the db is started with pg_ctl anc a "c" flag. I couldn't find anything on enabling it on the docker image.
> > > > > > > > > > > >
> > > > > > > > > > > > in my data folder, I have a huge core file (8 GB). Would it be possible that it is the core dump file generated after the segfault?
> > > > > > > > > > >
> > > > > > > > > > > you can check a create time
> > > > > > > > > > >
> > > > > > > > > > > Pavel
> > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > Raphael
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > > On Saturday, Oct 10, 2020 at 6:04 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com (mailto:pavel(dot)stehule(at)gmail(dot)com)> wrote:
> > > > > > > > > > > > > Hi
> > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > If I can help in any ways, please let me know.
> > > > > > > > > > > > > > I don't mind trying things, like I said, the bug happens about every 2
> > > > > > > > > > > > > > days.
> > > > > > > > > > > > >
> > > > > > > > > > > > > This is a bug, but from your bug report isn't possible to detect any information.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Can you enable core dump generating, and can you send a core dump?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Regards
> > > > > > > > > > > > >
> > > > > > > > > > > > > Pavel
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Cheers!
> > > > > > > > > > > > > >