Multiple ERROR:dbus messages

[MikeMcC399]

Current behavior

When running Cypress 15 on Linux in a CI system, multiple garbage error messages such as the following are output:

[246:0820/083338.529340:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory

Desired behavior

• This is a regression from previous Cypress 15 pre-release versions. It may be due to fix: Redirect spammy electron stderr to a debug sink #32188.

• Reverting to PR breaking: update execa from 1.0.0 to 4.1.0  #32238 f6e0744, to an earlier Cypress 15 pre-release commit, reduces the number of error messages (npm install https://cdn.cypress.io/beta/npm/15.0.0/linux-x64/develop-f6e0744e38f6b86af49ea3b036bedbe45a672008/cypress.tgz). The following does however remain:

[244:0820/085133.641609:ERROR:dbus/object_proxy.cc:590] Failed to call method: org.freedesktop.DBus.NameHasOwner: object_path= /org/freedesktop/DBus: unknown error type:

• Testing against Cypress 14.5.4, no such error messages are displayed.

Test code to reproduce

See for instance https://github.com/cypress-io/cypress-realworld-app/actions/workflows/main.yml also ...

git clone --branch test/examples/15-beta-linux-x64 https://github.com/MikeMcC399/cypress-docker-images
cd cypress-docker-images
cd examples/basic         # Use a pre-configured simple Cypress E2E project
npm ci                    # Install Cypress
docker run -it --rm -v .:/app -w /app cypress/base  # Run image as container

At the bash prompt :/app# enter the following commands:

npx cypress install       # Install Cypress binary into running Docker container
npx cypress run           # Run Cypress test

Cypress Version

15.0.0

Node version

v22.18.0 LTS

Operating System

Debian 12.11 in Docker Desktop v4.44.2 in Ubuntu 24.04.3 LTS host

Debug Logs

npx cypress run           # Run Cypress test


[246:0820/083338.529340:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
[246:0820/083339.098784:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
[246:0820/083339.098893:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
[246:0820/083339.099889:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Address does not contain a colon
[246:0820/083339.099920:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Address does not contain a colon
[246:0820/083339.099932:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Address does not contain a colon
[246:0820/083339.099942:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Address does not contain a colon
[246:0820/083339.099956:ERROR:dbus/object_proxy.cc:590] Failed to call method: org.freedesktop.DBus.NameHasOwner: object_path= /org/freedesktop/DBus: unknown error type:

DevTools listening on ws://127.0.0.1:37529/devtools/browser/ed937c40-8948-4281-b2ee-01257d006b30

====================================================================================================

  (Run Starting)

  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ Cypress:        15.0.0                                                                         │
  │ Browser:        Electron 136 (headless)                                                        │
  │ Node Version:   v22.18.0 (/usr/local/bin/node)                                                 │
  │ Specs:          1 found (spec.cy.js)                                                           │
  │ Searched:       cypress/e2e/**/*.cy.{js,jsx,ts,tsx}                                            │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘


────────────────────────────────────────────────────────────────────────────────────────────────────

  Running:  spec.cy.js                                                                      (1 of 1)
[246:0820/083340.598578:ERROR:dbus/bus.cc:408] Failed to connect to the bus: Address does not contain a colon


  test local demo page
    ✓ heading (206ms)


  1 passing (261ms)


  (Results)

  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ Tests:        1                                                                                │
  │ Passing:      1                                                                                │
  │ Failing:      0                                                                                │
  │ Pending:      0                                                                                │
  │ Skipped:      0                                                                                │
  │ Screenshots:  0                                                                                │
  │ Video:        false                                                                            │
  │ Duration:     0 seconds                                                                        │
  │ Spec Ran:     spec.cy.js                                                                       │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘


====================================================================================================

  (Run Finished)


       Spec                                              Tests  Passing  Failing  Pending  Skipped
  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ ✔  spec.cy.js                               263ms        1        1        -        -        - │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘
    ✔  All specs passed!                        263ms        1        1        -        -        -

Other

No response

[MikeMcC399]

Confirmed that issue also occurs in released cypress@15.0.0 version

[cacieprins]

Thanks for this, @MikeMcC399 ! We'll add a new system test to catch it, and work on fixing it. A rundown on what's going on here:

• ./cli, the node package that gets published, launches @packages/server as a child process.
• /packages/server, when started, will launch a child process wrapped in electron.

Prior to #32188, we filtered content written to the stderr stream at the cli<->@packages/server boundary with a long list of complex regular expressions. Now we're filtering at the packages/server <-> electron process boundary by detecting the source of the stderr, rather than matching on patterns - so theoretically it should be much less fragile than before. Moving child process boundaries was done to filter this output in more contexts than cli's spawn - such as our system tests, which launch Cypress directly rather than through the cli. Unfortunately, this also means we're missing a layer of problematic stderr writes.

In the meantime, if you want to hide this from your console output, you can pipe cypress' stderr output to a file with your favorite shell:

cypress run [your arguments here] 2> stderr.log

Note that because debug writes to stderr, if any namespaces are enabled with the DEBUG environment variable, those log entries will end up in the log file as well. This will end up shunting legitimate console.error messaging from Cypress itself to the file.

[MikeMcC399]

This issue also affects running Cypress in a Windows WSL2 environment using a Ubuntu 24.04.3 LTS Linux system in WSL2.

[MikeMcC399]

@jennifer-shehane / @cacieprins

• I suggest to prioritize a fix, or if that is not possible short-term, then consider reverting PR fix: Redirect spammy electron stderr to a debug sink #32188.

This issue is allowing garbage error messages to appear in the logs of Cypress CI examples running under Linux in repos that have been updated to Cypress 15.0.0:

• cypress-io/cypress-example-kitchensink
• cypress-io/cypress-realworld-app
• cypress-io/github-action
• cypress-io/cypress-docker-images
• cypress-io/circleci-orb

The problem is not immediately flagged, since each of the workflows succeeds. It just causes messy logs.

The PR was merged close to the release day of Cypress 15.0.0 leading to gaps in pre-release testing in the example repos, also in conjunction with the availability issue of pre-release binaries (see #32291)