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https://issues.apache.org/jira/browse/CB-14020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538407#comment-16538407
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ASF GitHub Bot commented on CB-14020:
-------------------------------------
Unibozu commented on issue #104: CB-14020: (ios) Fix "Collection was mutated
while being enumerated" crash
URL:
https://github.com/apache/cordova-plugin-geolocation/pull/104#issuecomment-403786092
Some visibility regarding this issue would be appreciated.
About 5% of our users (more than 2,000 over the last 3 months) are affected
by this issue. Since the exception is not caught, it crashes the app as soon as
`addWatch` is called under specific circumstances (which we haven't been able
to reproduce). We call `addWatch` very early when our application starts, and
some users have reported that trying to start the app again multiple times in a
row seems to be a temporary solution.
It's irrelevant of the iOS version or iphone model.
Almost all of these crashes are due to CDVLocation
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> cordova-plugin-geolocation crashes with "Collection was mutated while being
> enumerated"
> ---------------------------------------------------------------------------------------
>
> Key: CB-14020
> URL: https://issues.apache.org/jira/browse/CB-14020
> Project: Apache Cordova
> Issue Type: Bug
> Components: cordova-plugin-geolocation
> Affects Versions: Master
> Environment: iOS 11
> [email protected]
> [email protected]
> Although I am running an older version, this issue does not appear to be
> fixed in the latest plugin version as the relevant code has not been changed.
> The javascript in my app is making multiple calls to
> `navigator.geolocation.getCurrentPosition()` in rapid succession.
> Reporter: Elijah R
> Priority: Major
> Labels: crash, easyfix, pull-request-available, race-condition
> Attachments: crash-log.txt
>
>
> There is a race condition in CDVLocation.m. The
> self.locationData.locationCallbacks array can be mutated in one thread and
> enumerated concurrently in another thread, which causes the app to crash with
> the following exception:
> Fatal Exception: NSGenericException
> Collection <__NSArrayM: 0x1d444d020> was mutated while being enumerated.
> The exception is raised at [CDVLocation returnLocationError:withMessage:]
> (CDVLocation.m:312)
> I am unable to reproduce the issue, however it is a common crash for users of
> my app. A user named seeday on github has opened a pull request to address
> this issue: https://github.com/apache/cordova-plugin-geolocation/pull/91
> I'm filing this bug to help get that work merged.
> I've attached an abridged crash log with the relevant stack trace.
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