On bitbucket pipeline 2 tests of 4 run successfully and others fail while locally all 4 pass

[elena_skorodilo]

Hi! I have several (4) python selenium tests (each test in separate python file with test method) which I want to run on a BIT BUCKET PIPELINE. But it always fails after performing successfully 2 of 4 tests (tried to change order, used different commands for running them, but nothing helps).

All 4 run without any issues on local machine.

Is it something related to session lifetime for queued slots or something of the kind? Could it be memory issue? Don't quite get how to fix it, could you help me please, any ideas what I can try will be appreciated.

#bitbucket-pipelines.yml

image: python:3.11


pipelines:
default:
- parallel:
- step:
size: 2x
name: Test
caches:
- pip
script:
- export DOCKER_BUILDKIT=1
- docker build .
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
- python3 -m pytest tests/*
services:
- docker
- selenium-chrome


definitions:
services:
selenium-chrome:
image: selenium/standalone-chrome:latest
ports:
- "4444:4444"
restart: always

docker log

time="2023-12-27T12:12:11.699227163Z" level=warning msg="could not change group /var/run/docker.sock to docker: group docker not found"

3

time="2023-12-27T12:12:11.699406535Z" level=warning msg="Binding to IP address without --tlsverify is insecure and gives root access on this machine to everyone who has access to your network." host="tcp://0.0.0.0:2375"

4

time="2023-12-27T12:12:11.699459523Z" level=warning msg="Binding to an IP address, even on localhost, can also give access to scripts run in a browser. Be safe out there!" host="tcp://0.0.0.0:2375"

5

time="2023-12-27T12:12:12.699599198Z" level=warning msg="Binding to an IP address without --tlsverify is deprecated. Startup is intentionally being slowed down to show this message" host="tcp://0.0.0.0:2375"

6

time="2023-12-27T12:12:12.699650228Z" level=warning msg="Please consider generating tls certificates with client validation to prevent exposing unauthenticated root access to your network" host="tcp://0.0.0.0:2375"

7

time="2023-12-27T12:12:12.699664702Z" level=warning msg="You can override this by explicitly specifying '--tls=false' or '--tlsverify=false'" host="tcp://0.0.0.0:2375"

8

time="2023-12-27T12:12:12.699681894Z" level=warning msg="Support for listening on TCP without authentication or explicit intent to run without authentication will be removed in the next release" host="tcp://0.0.0.0:2375"

9

time="2023-12-27T12:12:27Z" level=warning msg="containerd config version `1` has been deprecated and will be removed in containerd v2.0, please switch to version `2`, see https://github.com/containerd/containerd/blob/main/docs/PLUGINS.md#version-header"

10

time="2023-12-27T12:12:27.742544096Z" level=warning msg="failed to load plugin io.containerd.snapshotter.v1.devmapper" error="devmapper not configured"

11

time="2023-12-27T12:12:27.743098517Z" level=warning msg="could not use snapshotter devmapper in metadata plugin" error="devmapper not configured"

12

time="2023-12-27T12:12:27.745033009Z" level=warning msg="failed to load plugin io.containerd.internal.v1.opt" error="mkdir /opt/containerd: read-only file system"

13

time="2023-12-27T12:12:27.745089454Z" level=error msg="failed to initialize a tracing processor \"otlp\"" error="no OpenTelemetry endpoint: skip plugin"

14

time="2023-12-27T12:12:27.784114982Z" level=warning msg="Your kernel does not support CPU realtime scheduler"

15

time="2023-12-27T12:12:27.784134863Z" level=warning msg="Your kernel does not support cgroup blkio weight"

16

time="2023-12-27T12:12:27.784140033Z" level=warning msg="Your kernel does not support cgroup blkio weight_device"

17

time="2023-12-27T12:12:28Z" level=info msg="Pipelines plugin request authorization." allowed=false method=HEAD plugin=pipelines uri=/_ping

18

time="2023-12-27T12:12:28.891172607Z" level=error msg="AuthZRequest for HEAD /_ping returned error: authorization denied by plugin pipelines: "

19

time="2023-12-27T12:12:28Z" level=info msg="Pipelines plugin request authorization." allowed=true method=GET plugin=pipelines uri=/_ping

20

time="2023-12-27T12:12:28Z" level=info msg="Pipelines plugin request authorization." allowed=true method=POST plugin=pipelines uri="/v1.41/build?buildargs=%7B%7D&buildid=e0b3a18392bf51bba49874f6ff0dd29a680d915cdf531dce711cc3ba6a063659&cachefrom=%5B%5D&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=&labels=%7B%7D&memory=0&memswap=0&networkmode=default&remote=client-session&rm=1&session=4urmns2m0end7qowp48cyic35&shmsize=0&target=&ulimits=null&version=2"

21

time="2023-12-27T12:12:28Z" level=info msg="Pipelines plugin request authorization." allowed=true method=POST plugin=pipelines uri=/session

22

time="2023-12-27T12:12:44.377384391Z" level=warning msg="grpc: addrConn.createTransport failed to connect to {localhost <nil> 0 <nil>}. Err :connection error: desc = \"transport: Error while dialing only one connection allowed\". Reconnecting..." module=grpc

selenium-chrome service log:

2023-12-27 12:12:11,646 INFO Included extra file "/etc/supervisor/conf.d/selenium.conf" during parsing

3

2023-12-27 12:12:11,649 INFO RPC interface 'supervisor' initialized

4

2023-12-27 12:12:11,649 CRIT Server 'unix_http_server' running without any HTTP authentication checking

5

2023-12-27 12:12:11,649 INFO supervisord started with pid 8

6

2023-12-27 12:12:12,651 INFO spawned: 'xvfb' with pid 9

7

2023-12-27 12:12:12,653 INFO spawned: 'vnc' with pid 10

8

2023-12-27 12:12:12,654 INFO spawned: 'novnc' with pid 11

9

2023-12-27 12:12:12,657 INFO spawned: 'selenium-standalone' with pid 12

10

Setting up SE_NODE_GRID_URL...

11

2023-12-27 12:12:12,665 INFO success: xvfb entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)

12

2023-12-27 12:12:12,665 INFO success: vnc entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)

13

2023-12-27 12:12:12,665 INFO success: novnc entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)

14

2023-12-27 12:12:12,665 INFO success: selenium-standalone entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)

15

Selenium Grid Standalone configuration:

16

[network]

17

relax-checks = true

18

19

[node]

20

session-timeout = "300"

21

override-max-sessions = false

22

detect-drivers = false

23

drain-after-session-count = 0

24

max-sessions = 1

25

26

[[node.driver-configuration]]

27

display-name = "chrome"

28

stereotype = '{"browserName": "chrome", "browserVersion": "120.0", "platformName": "Linux", "goog:chromeOptions": {"binary": "/usr/bin/google-chrome"}}'

29

max-sessions = 1

30

31

Starting Selenium Grid Standalone...

32

Tracing is disabled

33

12:12:13.100 INFO [LoggingOptions.configureLogEncoding] - Using the system default encoding

34

12:12:13.111 INFO [OpenTelemetryTracer.createTracer] - Using OpenTelemetry for tracing

35

12:12:13.687 INFO [NodeOptions.getSessionFactories] - Detected 4 available processors

36

12:12:13.725 INFO [NodeOptions.report] - Adding chrome for {"browserName": "chrome","browserVersion": "120.0","goog:chromeOptions": {"binary": "\u002fusr\u002fbin\u002fgoogle-chrome"},"platformName": "linux","se:noVncPort": 7900,"se:vncEnabled": true} 1 times

37

12:12:13.744 INFO [Node.<init>] - Binding additional locator mechanisms: relative

38

12:12:13.759 INFO [GridModel.setAvailability] - Switching Node a3c46228-9323-45dc-ad50-56e2bdb2280d (uri: http://10.38.209.59:4444) from DOWN to UP

39

12:12:13.759 INFO [LocalDistributor.add] - Added node a3c46228-9323-45dc-ad50-56e2bdb2280d at http://10.38.209.59:4444. Health check every 120s

40

12:12:13.891 INFO [Standalone.execute] - Started Selenium Standalone 4.16.1 (revision 9b4c83354e): http://10.38.209.59:4444

41

12:12:50.699 INFO [LocalDistributor.newSession] - Session request received by the Distributor:

42

[Capabilities {browserName: chrome, goog:chromeOptions: {args: [--ignore-ssl-errors=yes, --ignore-certificate-errors], extensions: []}, pageLoadStrategy: normal}]

43

12:12:51.358 INFO [LocalNode.newSession] - Session created by the Node. Id: f7199b9f6b25e166289e7758fe1994be, Caps: Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 120.0.6099.109, chrome: {chromedriverVersion: 120.0.6099.109 (3419140ab66..., userDataDir: /tmp/.org.chromium.Chromium...}, fedcm:accounts: true, goog:chromeOptions: {debuggerAddress: localhost:37325}, networkConnectionEnabled: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:bidiEnabled: false, se:cdp: ws://10.38.209.59:4444/sess..., se:cdpVersion: 120.0.6099.109, se:vnc: ws://10.38.209.59:4444/sess..., se:vncEnabled: true, se:vncLocalAddress: ws://10.38.209.59:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:extension:minPinLength: true, webauthn:extension:prf: true, webauthn:virtualAuthenticators: true}

44

12:12:51.364 INFO [LocalDistributor.newSession] - Session created by the Distributor. Id: f7199b9f6b25e166289e7758fe1994be

45

Caps: Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 120.0.6099.109, chrome: {chromedriverVersion: 120.0.6099.109 (3419140ab66..., userDataDir: /tmp/.org.chromium.Chromium...}, fedcm:accounts: true, goog:chromeOptions: {debuggerAddress: localhost:37325}, networkConnectionEnabled: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:bidiEnabled: false, se:cdp: ws://10.38.209.59:4444/sess..., se:cdpVersion: 120.0.6099.109, se:vnc: ws://10.38.209.59:4444/sess..., se:vncEnabled: true, se:vncLocalAddress: ws://10.38.209.59:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:extension:minPinLength: true, webauthn:extension:prf: true, webauthn:virtualAuthenticators: true}

46

12:18:03.375 WARN [SeleniumSpanExporter$1.lambda$export$3] - {"traceId": "24504b454bd111d72ffa40ae4bfb4c1b","eventTime": 1703679483371818659,"eventName": "HTTP request execution complete","attributes": {"http.flavor": 1,"http.handler_class": "org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue","http.host": "localhost:4444","http.method": "POST","http.request_content_length": "220","http.scheme": "HTTP","http.status_code": 500,"http.target": "\u002fsession","http.user_agent": "selenium\u002f4.15.2 (python linux)"}}

47

48

12:18:13.753 INFO [LocalNode.stopTimedOutSession] - Session id f7199b9f6b25e166289e7758fe1994be timed out, stopping...

49

12:18:13.900 INFO [LocalSessionMap.lambda$new$0] - Deleted session from local Session Map, Id: f7199b9f6b25e166289e7758fe1994be

50

12:18:13.901 INFO [GridModel.release] - Releasing slot for session id f7199b9f6b25e166289e7758fe1994be

51

12:18:13.901 INFO [SessionSlot.stop] - Stopping session f7199b9f6b25e166289e7758fe1994be

52

12:18:13.908 INFO [LocalDistributor.newSession] - Session request received by the Distributor:

53

[Capabilities {browserName: chrome, goog:chromeOptions: {args: [--ignore-ssl-errors=yes, --ignore-certificate-errors], extensions: []}, pageLoadStrategy: normal}]

54

12:18:14.307 INFO [LocalNode.newSession] - Session created by the Node. Id: e6eb7896d0738558bdbb036a3168818d, Caps: Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 120.0.6099.109, chrome: {chromedriverVersion: 120.0.6099.109 (3419140ab66..., userDataDir: /tmp/.org.chromium.Chromium...}, fedcm:accounts: true, goog:chromeOptions: {debuggerAddress: localhost:36309}, networkConnectionEnabled: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:bidiEnabled: false, se:cdp: ws://10.38.209.59:4444/sess..., se:cdpVersion: 120.0.6099.109, se:vnc: ws://10.38.209.59:4444/sess..., se:vncEnabled: true, se:vncLocalAddress: ws://10.38.209.59:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:extension:minPinLength: true, webauthn:extension:prf: true, webauthn:virtualAuthenticators: true}

55

12:18:14.309 INFO [LocalDistributor.newSession] - Session created by the Distributor. Id: e6eb7896d0738558bdbb036a3168818d

56

Caps: Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 120.0.6099.109, chrome: {chromedriverVersion: 120.0.6099.109 (3419140ab66..., userDataDir: /tmp/.org.chromium.Chromium...}, fedcm:accounts: true, goog:chromeOptions: {debuggerAddress: localhost:36309}, networkConnectionEnabled: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:bidiEnabled: false, se:cdp: ws://10.38.209.59:4444/sess..., se:cdpVersion: 120.0.6099.109, se:vnc: ws://10.38.209.59:4444/sess..., se:vncEnabled: true, se:vncLocalAddress: ws://10.38.209.59:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:extension:minPinLength: true, webauthn:extension:prf: true, webauthn:virtualAuthenticators: true}

57

12:23:19.565 WARN [SeleniumSpanExporter$1.lambda$export$3] - {"traceId": "0f6da5d941a107b2582defa07a78151e","eventTime": 1703679799564851679,"eventName": "HTTP request execution complete","attributes": {"http.flavor": 1,"http.handler_class": "org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue","http.host": "localhost:4444","http.method": "POST","http.request_content_length": "220","http.scheme": "HTTP","http.status_code": 500,"http.target": "\u002fsession","http.user_agent": "selenium\u002f4.15.2 (python linux)"}}

58

59

stack trace of failed tests

E at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1128)

307

E at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:628)

308

E at java.lang.Thread.run (Thread.java:829)

309

310

/usr/local/lib/python3.11/site-packages/selenium/webdriver/remote/errorhandler.py:229: SessionNotCreatedException

311

=========================== short test summary info ============================

312

FAILED tests/test_create_employee.py::EmployeeCreationTest::test_employee_creation - selenium.common.exceptions.SessionNotCreatedException: Message: Could not start a new session. New session request timed out

313

Host info: host: '0c09449d-4825-41d3-8be2-513bc292c27c-mpp5j', ip: '10.39.56.47'

314

Build info: version: '4.16.1', revision: '9b4c83354e'

315

System info: os.name: 'Linux', os.arch: 'amd64', os.version: '5.15.0-1050-aws', java.version: '11.0.21'

316

Driver info: driver.version: unknown

317

Stacktrace:

318

at org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue.addToQueue (LocalNewSessionQueue.java:221)

319

at org.openqa.selenium.grid.sessionqueue.NewSessionQueue.lambda$new$0 (NewSessionQueue.java:68)

320

at org.openqa.selenium.remote.http.Route$TemplatizedRoute.handle (Route.java:193)

321

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

322

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

323

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

324

at org.openqa.selenium.grid.sessionqueue.NewSessionQueue.execute (NewSessionQueue.java:128)

325

at org.openqa.selenium.remote.tracing.SpanWrappedHttpHandler.execute (SpanWrappedHttpHandler.java:87)

326

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

327

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

328

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

329

at org.openqa.selenium.grid.router.Router.execute (Router.java:87)

330

at org.openqa.selenium.grid.web.EnsureSpecCompliantResponseHeaders.lambda$apply$0 (EnsureSpecCompliantResponseHeaders.java:34)

331

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

332

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

333

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

334

at org.openqa.selenium.remote.http.Route$NestedRoute.handle (Route.java:271)

335

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

336

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

337

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

338

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

339

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

340

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

341

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

342

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

343

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

344

at org.openqa.selenium.remote.AddWebDriverSpecHeaders.lambda$apply$0 (AddWebDriverSpecHeaders.java:35)

345

at org.openqa.selenium.remote.ErrorFilter.lambda$apply$0 (ErrorFilter.java:44)

346

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

347

at org.openqa.selenium.remote.ErrorFilter.lambda$apply$0 (ErrorFilter.java:44)

348

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

349

at org.openqa.selenium.netty.server.SeleniumHandler.lambda$channelRead0$0 (SeleniumHandler.java:44)

350

at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:515)

351

at java.util.concurrent.FutureTask.run (FutureTask.java:264)

352

at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1128)

353

at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:628)

354

at java.lang.Thread.run (Thread.java:829)

355

FAILED tests/test_service.py::ServiceCreationTest::test_service_creation - selenium.common.exceptions.SessionNotCreatedException: Message: Could not start a new session. New session request timed out

356

Host info: host: '0c09449d-4825-41d3-8be2-513bc292c27c-mpp5j', ip: '10.39.56.47'

357

Build info: version: '4.16.1', revision: '9b4c83354e'

358

System info: os.name: 'Linux', os.arch: 'amd64', os.version: '5.15.0-1050-aws', java.version: '11.0.21'

359

Driver info: driver.version: unknown

360

Stacktrace:

361

at org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue.addToQueue (LocalNewSessionQueue.java:221)

362

at org.openqa.selenium.grid.sessionqueue.NewSessionQueue.lambda$new$0 (NewSessionQueue.java:68)

363

at org.openqa.selenium.remote.http.Route$TemplatizedRoute.handle (Route.java:193)

364

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

365

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

366

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

367

at org.openqa.selenium.grid.sessionqueue.NewSessionQueue.execute (NewSessionQueue.java:128)

368

at org.openqa.selenium.remote.tracing.SpanWrappedHttpHandler.execute (SpanWrappedHttpHandler.java:87)

369

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

370

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

371

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

372

at org.openqa.selenium.grid.router.Router.execute (Router.java:87)

373

at org.openqa.selenium.grid.web.EnsureSpecCompliantResponseHeaders.lambda$apply$0 (EnsureSpecCompliantResponseHeaders.java:34)

374

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

375

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

376

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

377

at org.openqa.selenium.remote.http.Route$NestedRoute.handle (Route.java:271)

378

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

379

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

380

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

381

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

382

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

383

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

384

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

385

at org.openqa.selenium.remote.http.Route$CombinedRoute.handle (Route.java:345)

386

at org.openqa.selenium.remote.http.Route.execute (Route.java:69)

387

at org.openqa.selenium.remote.AddWebDriverSpecHeaders.lambda$apply$0 (AddWebDriverSpecHeaders.java:35)

388

at org.openqa.selenium.remote.ErrorFilter.lambda$apply$0 (ErrorFilter.java:44)

389

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

390

at org.openqa.selenium.remote.ErrorFilter.lambda$apply$0 (ErrorFilter.java:44)

391

at org.openqa.selenium.remote.http.Filter$1.execute (Filter.java:63)

392

at org.openqa.selenium.netty.server.SeleniumHandler.lambda$channelRead0$0 (SeleniumHandler.java:44)

393

at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:515)

394

at java.util.concurrent.FutureTask.run (FutureTask.java:264)

395

at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1128)

396

at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:628)

397

at java.lang.Thread.run (Thread.java:829)

[elena_skorodilo]

UPDATE

So the solution is to increase max-session by passing 

SE_NODE_OVERRIDE_MAX_SESSIONS: 'true'
SE_NODE_MAX_SESSIONS: 8

So final bitbucket-pipelines.yml looks like this

image: python:3.11


pipelines:
default:
- parallel:
- step:
size: 2x
shm_size: 2gb
runs-on:
- 'self.hosted'
name: Test
caches:
- pip
script:
- export DOCKER_BUILDKIT=1
- docker build .
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 - python3 -m pytest tests/*
services:
- docker
- selenium-chrome


definitions:
       services:
              selenium-chrome:
              image: selenium/standalone-chrome:latest
              ports:
                   - "4444:4444"
              restart: always
              environment:
                   SE_NODE_OVERRIDE_MAX_SESSIONS: 'true'
                   SE_NODE_MAX_SESSIONS: 8