App hangs v2 report very high (and invalid) durations

[ghugues]

Platform

iOS

Environment

Production

Installed

Manually

Version

8.53.1

Xcode Version

16.4

Did it work on previous versions?

Yes, before we enabled app hang tracking v2

Steps to Reproduce

Enable App Hang tracking v2.

Expected Result

App hangs report the actual hanging duration, if any.

Actual Result

Sentry reports very high hanging duration (1895 seconds in the provided example), when breadcrumbs clearly show the app was not hanging.

Maybe this is linked to the fact that the app was launched in background and only actually opened much later ?

See https://amoamoamo.sentry.io/issues/6769842273/events/1f51b1d7caa546bc87d7e181a390fd24/?project=4504957006708736

Are you willing to submit a PR?

No response

[linear]

COCOA-525 App hangs v2 report very high (and invalid) durations

[itaybre]

Hey @ghughes, we released a fix on 8.54.0 for this.
Updating should fix this issue. Please let us know if the issue is still happening.

[philipphofmann]

That's the fix that could fix this problem #5681. Please reopen the issue if the issue persists.

[ghugues]

@philipphofmann can you reopen this issue (I don't have permissions) ? We're still seeing a lot if false positives with 8.54.0

Example: https://amoamoamo.sentry.io/issues/6769842273/events/26d3dc95c61642e38eb2bb737bcbbac2
In this example, not only the main thread is not blocked (according to the stack trace), but breadcrumbs show that "App lifecycle foreground" ran just before hang detection. Since this event can only be fired from the main thread, the main thread was not blocked.

If this is unrelated to the previous issue, let me know and I will open a new issue.