Azure App Service (Linux, PHP 8.4) - Kudu container crash looping, app completely down

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Azure App Service (Linux, PHP 8.4) - Kudu container crash looping, app completely down

Suzanne Pledger 25

My App Service has been down since this morning. The platform logs show the Kudu container (appsvc/kudulite:bookworm_20260420.5.tuxprod) starting and then immediately terminating with "Grace period: 0 seconds" in a continuous loop. The container starts, runs for approximately 2 seconds, then stops. This repeats indefinitely.

The built-in diagnostic tool incorrectly reports the service as healthy. Kudu (SCM endpoint) is completely inaccessible. The app itself never gets a chance to start.

I have tried:

Restarting the App Service
Using the Repair option on the worker
Scaling up from B1 to B2 to force a new worker
Redeploying via GitHub Actions

None of these resolved the issue. This appears to be a platform-level issue with the Kudu container rather than anything in my application code.

Region: Canada East App Service Plan: Basic B2 (currently scaled up from B1 trying to resolve) Runtime: PHP 8.4 on Linux

Praneeth Maddali 9,515 Reputation points Microsoft External Staff Moderator

2026-05-13T18:48:26.3533333+00:00

Hi @Suzanne Pledger

Just following up to see if your issue has been resolved or if you had a chance to review my earlier comment?
Suzanne Pledger 25 Reputation points

2026-05-14T14:53:40.27+00:00

Hi @Praneeth Maddali I am still facing this issue. Though log stream is now showing empty. I read your first message as though you were in the process of looking into the issue and I had already given all of the information I was able to find in my original question which is why I didn't respond further.

Is this issue being looked into? I don't want to try restarting the instance on my end if there is someone actively looking into it.
Praneeth Maddali 9,515 Reputation points Microsoft External Staff Moderator

2026-05-14T16:27:06.01+00:00

Hi @Suzanne Pledger

We have reached out to you in Private messages for additional details, could you please look into it and share us the details we are waiting for the details? Thanks

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Praneeth Maddali 9,515 Reputation points Microsoft External Staff Moderator

2026-05-13T18:48:26.3533333+00:00

Hi @Suzanne Pledger

Just following up to see if your issue has been resolved or if you had a chance to review my earlier comment?
Suzanne Pledger 25 Reputation points

2026-05-14T14:53:40.27+00:00

Hi @Praneeth Maddali I am still facing this issue. Though log stream is now showing empty. I read your first message as though you were in the process of looking into the issue and I had already given all of the information I was able to find in my original question which is why I didn't respond further.

Is this issue being looked into? I don't want to try restarting the instance on my end if there is someone actively looking into it.
Praneeth Maddali 9,515 Reputation points Microsoft External Staff Moderator

2026-05-14T16:27:06.01+00:00

Hi @Suzanne Pledger

We have reached out to you in Private messages for additional details, could you please look into it and share us the details we are waiting for the details? Thanks

Answer 1

Praneeth Maddali 9,515 Microsoft External Staff Moderator

Hi @Suzanne Pledger

As per our offline discussion, the issue is now resolved. After reducing (downgrading) the App Service plan, the service initially required some time to provision the worker. Once the worker stabilized, the application started running successfully.

The issue appears to have been triggered earlier during an upscale attempt, where a worker failed to start. Interestingly, downgrading the plan helped recover the service, and it is now operating as expected.

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Azure App Service (Linux, PHP 8.4) - Kudu container crash looping, app completely down

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