[Triage] Simple no config Gunicorn fails and restarts repeateadly

[CoolGuyNice]

Type

Bug Report

Description

What happened?
A simple dash application works fine when run directly.
However, when using Gunicorn, gunicorn first restarts without logging any errors, then the restarted program logs that the address is already in use and repeatedly restarts with the same issue.

What did you expect?
I expected the application to start once and run without issues.

Relation to other issues
I tried running with the "--no-control-socket" option suggested here #3510 did not help.

#3064
Which was closed by #3441
and released in 24.1.0
This issue seemed similar, but it's unclear to me whether it's the same issue and whether it was resolved or not.
I have the same issue when using Gunicorn version 24.1.0

Steps to Reproduce (for bugs)

1. mkdir test-project
2. create file dashboard.py with contents:
   from dash import Dash, html
   app = Dash()
   server = app.server
   app.layout = [
   html.H2("Hello World!"),
   ]
   app.run(host="0.0.0.0", debug=True)
3. run: python3 -m venv env
4. run: source env/bin/activate
5. run: pip install gunicorn dash
6. run: gunicorn dashboard:app

Configuration

gunicorn --log-level debug dashboard:app

Logs / Error Output

[2026-03-04 13:00:00 +0100] [72734] [DEBUG] Current configuration:
  config: ./gunicorn.conf.py
  wsgi_app: None
  bind: ['127.0.0.1:8000']
  backlog: 2048
  workers: 1
  worker_class: sync
  threads: 1
  worker_connections: 1000
  max_requests: 0
  max_requests_jitter: 0
  timeout: 30
  graceful_timeout: 30
  keepalive: 2
  limit_request_line: 4094
  limit_request_fields: 100
  limit_request_field_size: 8190
  reload: False
  reload_engine: auto
  reload_extra_files: []
  spew: False
  check_config: False
  print_config: False
  preload_app: False
  sendfile: None
  reuse_port: False
  chdir: ...
  daemon: False
  raw_env: []
  pidfile: None
  worker_tmp_dir: None
  user: 1000
  group: 1000
  umask: 0
  initgroups: False
  tmp_upload_dir: None
  secure_scheme_headers: {'X-FORWARDED-PROTOCOL': 'ssl', 'X-FORWARDED-PROTO': 'https', 'X-FORWARDED-SSL': 'on'}
  forwarded_allow_ips: ['127.0.0.1', '::1']
  accesslog: None
  disable_redirect_access_to_syslog: False
  access_log_format: %(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"
  errorlog: -
  loglevel: debug
  capture_output: False
  logger_class: gunicorn.glogging.Logger
  logconfig: None
  logconfig_dict: {}
  logconfig_json: None
  syslog_addr: udp://localhost:514
  syslog: False
  syslog_prefix: None
  syslog_facility: user
  enable_stdio_inheritance: False
  statsd_host: None
  dogstatsd_tags: 
  statsd_prefix: 
  enable_backlog_metric: False
  proc_name: None
  default_proc_name: dashboard:app
  pythonpath: None
  paste: None
  on_starting: <function OnStarting.on_starting at 0x745cc75439c0>
  on_reload: <function OnReload.on_reload at 0x745cc7543b00>
  when_ready: <function WhenReady.when_ready at 0x745cc7543c40>
  pre_fork: <function Prefork.pre_fork at 0x745cc7543d80>
  post_fork: <function Postfork.post_fork at 0x745cc7543ec0>
  post_worker_init: <function PostWorkerInit.post_worker_init at 0x745cc7560040>
  worker_int: <function WorkerInt.worker_int at 0x745cc7560180>
  worker_abort: <function WorkerAbort.worker_abort at 0x745cc75602c0>
  pre_exec: <function PreExec.pre_exec at 0x745cc7560400>
  pre_request: <function PreRequest.pre_request at 0x745cc7560540>
  post_request: <function PostRequest.post_request at 0x745cc75605e0>
  child_exit: <function ChildExit.child_exit at 0x745cc7560720>
  worker_exit: <function WorkerExit.worker_exit at 0x745cc7560860>
  nworkers_changed: <function NumWorkersChanged.nworkers_changed at 0x745cc75609a0>
  on_exit: <function OnExit.on_exit at 0x745cc7560ae0>
  ssl_context: <function NewSSLContext.ssl_context at 0x745cc7560cc0>
  proxy_protocol: off
  proxy_allow_ips: ['127.0.0.1', '::1']
  protocol: http
  uwsgi_allow_ips: ['127.0.0.1', '::1']
  keyfile: None
  certfile: None
  ssl_version: 2
  cert_reqs: 0
  ca_certs: None
  suppress_ragged_eofs: True
  do_handshake_on_connect: False
  ciphers: None
  http_protocols: ['h1']
  http2_max_concurrent_streams: 100
  http2_initial_window_size: 65535
  http2_max_frame_size: 16384
  http2_max_header_list_size: 65536
  raw_paste_global_conf: []
  permit_obsolete_folding: False
  strip_header_spaces: False
  permit_unconventional_http_method: False
  permit_unconventional_http_version: False
  casefold_http_method: False
  forwarder_headers: ['SCRIPT_NAME', 'PATH_INFO']
  header_map: drop
  asgi_loop: auto
  asgi_lifespan: auto
  asgi_disconnect_grace_period: 3
  root_path: 
  dirty_apps: []
  dirty_workers: 0
  dirty_timeout: 300
  dirty_threads: 1
  dirty_graceful_timeout: 30
  on_dirty_starting: <function OnDirtyStarting.on_dirty_starting at 0x745cc7561120>
  dirty_post_fork: <function DirtyPostFork.dirty_post_fork at 0x745cc7561260>
  dirty_worker_init: <function DirtyWorkerInit.dirty_worker_init at 0x745cc75613a0>
  dirty_worker_exit: <function DirtyWorkerExit.dirty_worker_exit at 0x745cc75614e0>
  control_socket: gunicorn.ctl
  control_socket_mode: 384
  control_socket_disable: False
[2026-03-04 13:00:00 +0100] [72734] [INFO] Starting gunicorn 25.1.0
[2026-03-04 13:00:00 +0100] [72734] [DEBUG] Arbiter booted
[2026-03-04 13:00:00 +0100] [72734] [INFO] Listening at: http://127.0.0.1:8000 (72734)
[2026-03-04 13:00:00 +0100] [72734] [INFO] Using worker: sync
[2026-03-04 13:00:00 +0100] [72734] [INFO] Control socket listening at .../gunicorn.ctl
[2026-03-04 13:00:00 +0100] [72736] [INFO] Booting worker with pid: 72736
[2026-03-04 13:00:00 +0100] [72734] [DEBUG] 1 workers
Dash is running on http://0.0.0.0:8050/

 * Serving Flask app 'dashboard'
 * Debug mode: on
[2026-03-04 13:00:00 +0100] [72738] [DEBUG] Current configuration:
  config: ./gunicorn.conf.py
  wsgi_app: None
  bind: ['127.0.0.1:8000']
  backlog: 2048
  workers: 1
  worker_class: sync
  threads: 1
  worker_connections: 1000
  max_requests: 0
  max_requests_jitter: 0
  timeout: 30
  graceful_timeout: 30
  keepalive: 2
  limit_request_line: 4094
  limit_request_fields: 100
  limit_request_field_size: 8190
  reload: False
  reload_engine: auto
  reload_extra_files: []
  spew: False
  check_config: False
  print_config: False
  preload_app: False
  sendfile: None
  reuse_port: False
  chdir: ...
  daemon: False
  raw_env: []
  pidfile: None
  worker_tmp_dir: None
  user: 1000
  group: 1000
  umask: 0
  initgroups: False
  tmp_upload_dir: None
  secure_scheme_headers: {'X-FORWARDED-PROTOCOL': 'ssl', 'X-FORWARDED-PROTO': 'https', 'X-FORWARDED-SSL': 'on'}
  forwarded_allow_ips: ['127.0.0.1', '::1']
  accesslog: None
  disable_redirect_access_to_syslog: False
  access_log_format: %(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"
  errorlog: -
  loglevel: debug
  capture_output: False
  logger_class: gunicorn.glogging.Logger
  logconfig: None
  logconfig_dict: {}
  logconfig_json: None
  syslog_addr: udp://localhost:514
  syslog: False
  syslog_prefix: None
  syslog_facility: user
  enable_stdio_inheritance: False
  statsd_host: None
  dogstatsd_tags: 
  statsd_prefix: 
  enable_backlog_metric: False
  proc_name: None
  default_proc_name: dashboard:app
  pythonpath: None
  paste: None
  on_starting: <function OnStarting.on_starting at 0x77f5cf60b9c0>
  on_reload: <function OnReload.on_reload at 0x77f5cf60bb00>
  when_ready: <function WhenReady.when_ready at 0x77f5cf60bc40>
  pre_fork: <function Prefork.pre_fork at 0x77f5cf60bd80>
  post_fork: <function Postfork.post_fork at 0x77f5cf60bec0>
  post_worker_init: <function PostWorkerInit.post_worker_init at 0x77f5cf628040>
  worker_int: <function WorkerInt.worker_int at 0x77f5cf628180>
  worker_abort: <function WorkerAbort.worker_abort at 0x77f5cf6282c0>
  pre_exec: <function PreExec.pre_exec at 0x77f5cf628400>
  pre_request: <function PreRequest.pre_request at 0x77f5cf628540>
  post_request: <function PostRequest.post_request at 0x77f5cf6285e0>
  child_exit: <function ChildExit.child_exit at 0x77f5cf628720>
  worker_exit: <function WorkerExit.worker_exit at 0x77f5cf628860>
  nworkers_changed: <function NumWorkersChanged.nworkers_changed at 0x77f5cf6289a0>
  on_exit: <function OnExit.on_exit at 0x77f5cf628ae0>
  ssl_context: <function NewSSLContext.ssl_context at 0x77f5cf628cc0>
  proxy_protocol: off
  proxy_allow_ips: ['127.0.0.1', '::1']
  protocol: http
  uwsgi_allow_ips: ['127.0.0.1', '::1']
  keyfile: None
  certfile: None
  ssl_version: 2
  cert_reqs: 0
  ca_certs: None
  suppress_ragged_eofs: True
  do_handshake_on_connect: False
  ciphers: None
  http_protocols: ['h1']
  http2_max_concurrent_streams: 100
  http2_initial_window_size: 65535
  http2_max_frame_size: 16384
  http2_max_header_list_size: 65536
  raw_paste_global_conf: []
  permit_obsolete_folding: False
  strip_header_spaces: False
  permit_unconventional_http_method: False
  permit_unconventional_http_version: False
  casefold_http_method: False
  forwarder_headers: ['SCRIPT_NAME', 'PATH_INFO']
  header_map: drop
  asgi_loop: auto
  asgi_lifespan: auto
  asgi_disconnect_grace_period: 3
  root_path: 
  dirty_apps: []
  dirty_workers: 0
  dirty_timeout: 300
  dirty_threads: 1
  dirty_graceful_timeout: 30
  on_dirty_starting: <function OnDirtyStarting.on_dirty_starting at 0x77f5cf629120>
  dirty_post_fork: <function DirtyPostFork.dirty_post_fork at 0x77f5cf629260>
  dirty_worker_init: <function DirtyWorkerInit.dirty_worker_init at 0x77f5cf6293a0>
  dirty_worker_exit: <function DirtyWorkerExit.dirty_worker_exit at 0x77f5cf6294e0>
  control_socket: gunicorn.ctl
  control_socket_mode: 384
  control_socket_disable: False
[2026-03-04 13:00:00 +0100] [72738] [INFO] Starting gunicorn 25.1.0
[2026-03-04 13:00:00 +0100] [72738] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:00 +0100] [72738] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:00 +0100] [72738] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:01 +0100] [72738] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:01 +0100] [72738] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:01 +0100] [72738] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:02 +0100] [72738] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:02 +0100] [72738] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:02 +0100] [72738] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:03 +0100] [72738] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:03 +0100] [72738] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:03 +0100] [72738] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:04 +0100] [72738] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:04 +0100] [72738] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:04 +0100] [72738] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:05 +0100] [72738] [ERROR] Can't connect to ('127.0.0.1', 8000)
[2026-03-04 13:00:05 +0100] [72736] [INFO] Worker exiting (pid: 72736)
[2026-03-04 13:00:05 +0100] [72734] [DEBUG] Handling signal: cld
[2026-03-04 13:00:05 +0100] [72734] [ERROR] Worker (pid:72736) exited with code 1.
[2026-03-04 13:00:05 +0100] [72793] [INFO] Booting worker with pid: 72793
Dash is running on http://0.0.0.0:8050/

 * Serving Flask app 'dashboard'
 * Debug mode: on
[2026-03-04 13:00:05 +0100] [72795] [DEBUG] Current configuration:
  config: ./gunicorn.conf.py
  wsgi_app: None
  bind: ['127.0.0.1:8000']
  backlog: 2048
  workers: 1
  worker_class: sync
  threads: 1
  worker_connections: 1000
  max_requests: 0
  max_requests_jitter: 0
  timeout: 30
  graceful_timeout: 30
  keepalive: 2
  limit_request_line: 4094
  limit_request_fields: 100
  limit_request_field_size: 8190
  reload: False
  reload_engine: auto
  reload_extra_files: []
  spew: False
  check_config: False
  print_config: False
  preload_app: False
  sendfile: None
  reuse_port: False
  chdir: ...
  daemon: False
  raw_env: []
  pidfile: None
  worker_tmp_dir: None
  user: 1000
  group: 1000
  umask: 0
  initgroups: False
  tmp_upload_dir: None
  secure_scheme_headers: {'X-FORWARDED-PROTOCOL': 'ssl', 'X-FORWARDED-PROTO': 'https', 'X-FORWARDED-SSL': 'on'}
  forwarded_allow_ips: ['127.0.0.1', '::1']
  accesslog: None
  disable_redirect_access_to_syslog: False
  access_log_format: %(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"
  errorlog: -
  loglevel: debug
  capture_output: False
  logger_class: gunicorn.glogging.Logger
  logconfig: None
  logconfig_dict: {}
  logconfig_json: None
  syslog_addr: udp://localhost:514
  syslog: False
  syslog_prefix: None
  syslog_facility: user
  enable_stdio_inheritance: False
  statsd_host: None
  dogstatsd_tags: 
  statsd_prefix: 
  enable_backlog_metric: False
  proc_name: None
  default_proc_name: dashboard:app
  pythonpath: None
  paste: None
  on_starting: <function OnStarting.on_starting at 0x7810372479c0>
  on_reload: <function OnReload.on_reload at 0x781037247b00>
  when_ready: <function WhenReady.when_ready at 0x781037247c40>
  pre_fork: <function Prefork.pre_fork at 0x781037247d80>
  post_fork: <function Postfork.post_fork at 0x781037247ec0>
  post_worker_init: <function PostWorkerInit.post_worker_init at 0x781037264040>
  worker_int: <function WorkerInt.worker_int at 0x781037264180>
  worker_abort: <function WorkerAbort.worker_abort at 0x7810372642c0>
  pre_exec: <function PreExec.pre_exec at 0x781037264400>
  pre_request: <function PreRequest.pre_request at 0x781037264540>
  post_request: <function PostRequest.post_request at 0x7810372645e0>
  child_exit: <function ChildExit.child_exit at 0x781037264720>
  worker_exit: <function WorkerExit.worker_exit at 0x781037264860>
  nworkers_changed: <function NumWorkersChanged.nworkers_changed at 0x7810372649a0>
  on_exit: <function OnExit.on_exit at 0x781037264ae0>
  ssl_context: <function NewSSLContext.ssl_context at 0x781037264cc0>
  proxy_protocol: off
  proxy_allow_ips: ['127.0.0.1', '::1']
  protocol: http
  uwsgi_allow_ips: ['127.0.0.1', '::1']
  keyfile: None
  certfile: None
  ssl_version: 2
  cert_reqs: 0
  ca_certs: None
  suppress_ragged_eofs: True
  do_handshake_on_connect: False
  ciphers: None
  http_protocols: ['h1']
  http2_max_concurrent_streams: 100
  http2_initial_window_size: 65535
  http2_max_frame_size: 16384
  http2_max_header_list_size: 65536
  raw_paste_global_conf: []
  permit_obsolete_folding: False
  strip_header_spaces: False
  permit_unconventional_http_method: False
  permit_unconventional_http_version: False
  casefold_http_method: False
  forwarder_headers: ['SCRIPT_NAME', 'PATH_INFO']
  header_map: drop
  asgi_loop: auto
  asgi_lifespan: auto
  asgi_disconnect_grace_period: 3
  root_path: 
  dirty_apps: []
  dirty_workers: 0
  dirty_timeout: 300
  dirty_threads: 1
  dirty_graceful_timeout: 30
  on_dirty_starting: <function OnDirtyStarting.on_dirty_starting at 0x781037265120>
  dirty_post_fork: <function DirtyPostFork.dirty_post_fork at 0x781037265260>
  dirty_worker_init: <function DirtyWorkerInit.dirty_worker_init at 0x7810372653a0>
  dirty_worker_exit: <function DirtyWorkerExit.dirty_worker_exit at 0x7810372654e0>
  control_socket: gunicorn.ctl
  control_socket_mode: 384
  control_socket_disable: False
[2026-03-04 13:00:05 +0100] [72795] [INFO] Starting gunicorn 25.1.0
[2026-03-04 13:00:05 +0100] [72795] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:05 +0100] [72795] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:05 +0100] [72795] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:06 +0100] [72795] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:06 +0100] [72795] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:06 +0100] [72795] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:07 +0100] [72795] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:07 +0100] [72795] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:07 +0100] [72795] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:08 +0100] [72795] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:08 +0100] [72795] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:08 +0100] [72795] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:09 +0100] [72795] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:09 +0100] [72795] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:09 +0100] [72795] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:10 +0100] [72795] [ERROR] Can't connect to ('127.0.0.1', 8000)
[2026-03-04 13:00:10 +0100] [72793] [INFO] Worker exiting (pid: 72793)
[2026-03-04 13:00:11 +0100] [72734] [DEBUG] Handling signal: cld
[2026-03-04 13:00:11 +0100] [72734] [ERROR] Worker (pid:72793) exited with code 1.
[2026-03-04 13:00:11 +0100] [72838] [INFO] Booting worker with pid: 72838
Dash is running on http://0.0.0.0:8050/

 * Serving Flask app 'dashboard'
 * Debug mode: on
[2026-03-04 13:00:11 +0100] [72841] [DEBUG] Current configuration:
  config: ./gunicorn.conf.py
  wsgi_app: None
  bind: ['127.0.0.1:8000']
  backlog: 2048
  workers: 1
  worker_class: sync
  threads: 1
  worker_connections: 1000
  max_requests: 0
  max_requests_jitter: 0
  timeout: 30
  graceful_timeout: 30
  keepalive: 2
  limit_request_line: 4094
  limit_request_fields: 100
  limit_request_field_size: 8190
  reload: False
  reload_engine: auto
  reload_extra_files: []
  spew: False
  check_config: False
  print_config: False
  preload_app: False
  sendfile: None
  reuse_port: False
  chdir: ...
  daemon: False
  raw_env: []
  pidfile: None
  worker_tmp_dir: None
  user: 1000
  group: 1000
  umask: 0
  initgroups: False
  tmp_upload_dir: None
  secure_scheme_headers: {'X-FORWARDED-PROTOCOL': 'ssl', 'X-FORWARDED-PROTO': 'https', 'X-FORWARDED-SSL': 'on'}
  forwarded_allow_ips: ['127.0.0.1', '::1']
  accesslog: None
  disable_redirect_access_to_syslog: False
  access_log_format: %(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"
  errorlog: -
  loglevel: debug
  capture_output: False
  logger_class: gunicorn.glogging.Logger
  logconfig: None
  logconfig_dict: {}
  logconfig_json: None
  syslog_addr: udp://localhost:514
  syslog: False
  syslog_prefix: None
  syslog_facility: user
  enable_stdio_inheritance: False
  statsd_host: None
  dogstatsd_tags: 
  statsd_prefix: 
  enable_backlog_metric: False
  proc_name: None
  default_proc_name: dashboard:app
  pythonpath: None
  paste: None
  on_starting: <function OnStarting.on_starting at 0x76a13a3c39c0>
  on_reload: <function OnReload.on_reload at 0x76a13a3c3b00>
  when_ready: <function WhenReady.when_ready at 0x76a13a3c3c40>
  pre_fork: <function Prefork.pre_fork at 0x76a13a3c3d80>
  post_fork: <function Postfork.post_fork at 0x76a13a3c3ec0>
  post_worker_init: <function PostWorkerInit.post_worker_init at 0x76a13a3e0040>
  worker_int: <function WorkerInt.worker_int at 0x76a13a3e0180>
  worker_abort: <function WorkerAbort.worker_abort at 0x76a13a3e02c0>
  pre_exec: <function PreExec.pre_exec at 0x76a13a3e0400>
  pre_request: <function PreRequest.pre_request at 0x76a13a3e0540>
  post_request: <function PostRequest.post_request at 0x76a13a3e05e0>
  child_exit: <function ChildExit.child_exit at 0x76a13a3e0720>
  worker_exit: <function WorkerExit.worker_exit at 0x76a13a3e0860>
  nworkers_changed: <function NumWorkersChanged.nworkers_changed at 0x76a13a3e09a0>
  on_exit: <function OnExit.on_exit at 0x76a13a3e0ae0>
  ssl_context: <function NewSSLContext.ssl_context at 0x76a13a3e0cc0>
  proxy_protocol: off
  proxy_allow_ips: ['127.0.0.1', '::1']
  protocol: http
  uwsgi_allow_ips: ['127.0.0.1', '::1']
  keyfile: None
  certfile: None
  ssl_version: 2
  cert_reqs: 0
  ca_certs: None
  suppress_ragged_eofs: True
  do_handshake_on_connect: False
  ciphers: None
  http_protocols: ['h1']
  http2_max_concurrent_streams: 100
  http2_initial_window_size: 65535
  http2_max_frame_size: 16384
  http2_max_header_list_size: 65536
  raw_paste_global_conf: []
  permit_obsolete_folding: False
  strip_header_spaces: False
  permit_unconventional_http_method: False
  permit_unconventional_http_version: False
  casefold_http_method: False
  forwarder_headers: ['SCRIPT_NAME', 'PATH_INFO']
  header_map: drop
  asgi_loop: auto
  asgi_lifespan: auto
  asgi_disconnect_grace_period: 3
  root_path: 
  dirty_apps: []
  dirty_workers: 0
  dirty_timeout: 300
  dirty_threads: 1
  dirty_graceful_timeout: 30
  on_dirty_starting: <function OnDirtyStarting.on_dirty_starting at 0x76a13a3e1120>
  dirty_post_fork: <function DirtyPostFork.dirty_post_fork at 0x76a13a3e1260>
  dirty_worker_init: <function DirtyWorkerInit.dirty_worker_init at 0x76a13a3e13a0>
  dirty_worker_exit: <function DirtyWorkerExit.dirty_worker_exit at 0x76a13a3e14e0>
  control_socket: gunicorn.ctl
  control_socket_mode: 384
  control_socket_disable: False
[2026-03-04 13:00:11 +0100] [72841] [INFO] Starting gunicorn 25.1.0
[2026-03-04 13:00:11 +0100] [72841] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:11 +0100] [72841] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:11 +0100] [72841] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:12 +0100] [72841] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:12 +0100] [72841] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:12 +0100] [72841] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:13 +0100] [72841] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:13 +0100] [72841] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:13 +0100] [72841] [DEBUG] Retrying in 1 second.
[2026-03-04 13:00:14 +0100] [72841] [ERROR] Connection in use: ('127.0.0.1', 8000)
[2026-03-04 13:00:14 +0100] [72841] [ERROR] connection to ('127.0.0.1', 8000) failed: [Errno 98] Address already in use
[2026-03-04 13:00:14 +0100] [72841] [DEBUG] Retrying in 1 second.
^C[2026-03-04 13:00:14 +0100] [72734] [INFO] Handling signal: int
[2026-03-04 13:00:14 +0100] [72838] [INFO] Worker exiting (pid: 72838)
[2026-03-04 13:00:14 +0100] [72734] [INFO] Shutting down: Master

Gunicorn Version

gunicorn (version 25.1.0)

Python Version

Python 3.11.14

Worker Class

sync (default)

Operating System

Linux Mint 22.3 - Cinnamon 64-bit

Additional Context

No response

Checklist

• I have searched existing discussions and issues for duplicates
• I have checked the documentation and FAQ

[CoolGuyNice]

Never mind, calling app.run while using Gunicorn was my mistake.