FileSortOrderByName crash : Comparison method violates its general contract!

[elbagers]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

Cause of error

Exception in thread "DefaultDispatcher-worker-5" java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeHi(TimSort.java:903)
    at java.util.TimSort.mergeAt(TimSort.java:520)
    at java.util.TimSort.mergeForceCollapse(TimSort.java:461)
    at java.util.TimSort.sort(TimSort.java:254)
    at java.util.Arrays.sort(Arrays.java:1365)
    at java.util.ArrayList.sortRange(ArrayList.java:1834)
    at java.util.ArrayList.sort(ArrayList.java:1827)
    at java.util.Collections.sort(Collections.java:207)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortOnlyByName(FileSortOrderByName.kt:59)
    at com.owncloud.android.utils.FileSortOrderByName.sortCloudFiles(FileSortOrderByName.kt:32)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invokeSuspend(OCFileListAdapterHelper.kt:159)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:8)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:4)
    at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:42)
    at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:164)
    at kotlinx.coroutines.BuildersKt.withContext(dex-id-91442b47c60370bd28760623fdb31acd4f2c6112:1)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.sortData(OCFileListAdapterHelper.kt:153)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.prepareFileList(OCFileListAdapterHelper.kt:101)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$prepareFileList$2.invokeSuspend(OCFileListAdapterHelper.kt:20)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
    at kotlinx.coroutines.UndispatchedCoroutine.afterResume(CoroutineContext.kt:266)
    at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
    at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:113)
    at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
    at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:589)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:823)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:720)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:707)

App information

• ID: com.nextcloud.client
• Version: 340000190
• Build flavor: gplay

Device information

• Brand: samsung
• Device: e3q
• Model: SM-S928U1
• Id: BP4A.251205.006
• Product: e3quew

Firmware

• SDK: 36
• Release: 16
• Incremental: S928U1UES6DZF2

Expected behaviour

Cause of error

Exception in thread "DefaultDispatcher-worker-5" java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeHi(TimSort.java:903)
    at java.util.TimSort.mergeAt(TimSort.java:520)
    at java.util.TimSort.mergeForceCollapse(TimSort.java:461)
    at java.util.TimSort.sort(TimSort.java:254)
    at java.util.Arrays.sort(Arrays.java:1365)
    at java.util.ArrayList.sortRange(ArrayList.java:1834)
    at java.util.ArrayList.sort(ArrayList.java:1827)
    at java.util.Collections.sort(Collections.java:207)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortOnlyByName(FileSortOrderByName.kt:59)
    at com.owncloud.android.utils.FileSortOrderByName.sortCloudFiles(FileSortOrderByName.kt:32)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invokeSuspend(OCFileListAdapterHelper.kt:159)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:8)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:4)
    at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:42)
    at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:164)
    at kotlinx.coroutines.BuildersKt.withContext(dex-id-91442b47c60370bd28760623fdb31acd4f2c6112:1)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.sortData(OCFileListAdapterHelper.kt:153)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.prepareFileList(OCFileListAdapterHelper.kt:101)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$prepareFileList$2.invokeSuspend(OCFileListAdapterHelper.kt:20)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
    at kotlinx.coroutines.UndispatchedCoroutine.afterResume(CoroutineContext.kt:266)
    at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
    at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:113)
    at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
    at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:589)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:823)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:720)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:707)

App information

• ID: com.nextcloud.client
• Version: 340000190
• Build flavor: gplay

Device information

• Brand: samsung
• Device: e3q
• Model: SM-S928U1
• Id: BP4A.251205.006
• Product: e3quew

Firmware

• SDK: 36
• Release: 16
• Incremental: S928U1UES6DZF2

Actual behaviour

Cause of error

Exception in thread "DefaultDispatcher-worker-5" java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeHi(TimSort.java:903)
    at java.util.TimSort.mergeAt(TimSort.java:520)
    at java.util.TimSort.mergeForceCollapse(TimSort.java:461)
    at java.util.TimSort.sort(TimSort.java:254)
    at java.util.Arrays.sort(Arrays.java:1365)
    at java.util.ArrayList.sortRange(ArrayList.java:1834)
    at java.util.ArrayList.sort(ArrayList.java:1827)
    at java.util.Collections.sort(Collections.java:207)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortOnlyByName(FileSortOrderByName.kt:59)
    at com.owncloud.android.utils.FileSortOrderByName.sortCloudFiles(FileSortOrderByName.kt:32)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invokeSuspend(OCFileListAdapterHelper.kt:159)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:8)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$sortData$2.invoke(OCFileListAdapterHelper.kt:4)
    at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:42)
    at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:164)
    at kotlinx.coroutines.BuildersKt.withContext(dex-id-91442b47c60370bd28760623fdb31acd4f2c6112:1)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.sortData(OCFileListAdapterHelper.kt:153)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper.prepareFileList(OCFileListAdapterHelper.kt:101)
    at com.owncloud.android.ui.adapter.helper.OCFileListAdapterHelper$prepareFileList$2.invokeSuspend(OCFileListAdapterHelper.kt:20)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
    at kotlinx.coroutines.UndispatchedCoroutine.afterResume(CoroutineContext.kt:266)
    at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:101)
    at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:113)
    at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
    at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:589)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:823)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:720)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:707)

App information

• ID: com.nextcloud.client
• Version: 340000190
• Build flavor: gplay

Device information

• Brand: samsung
• Device: e3q
• Model: SM-S928U1
• Id: BP4A.251205.006
• Product: e3quew

Firmware

• SDK: 36
• Release: 16
• Incremental: S928U1UES6DZF2

Android version

16

Device brand and model

Samsung S24 Ultra

Stock or custom OS?

Stock

Nextcloud android app version

340000190

Nextcloud server version

00

Using a reverse proxy?

I don't know

Android logs

No response

Server error logs

Additional information

No response

[alihrhera]

Could you please provide a list of the file names associated with the crash, if available?

[elbagers]

It's a one folder named S24 Ultra with 167 GB. Suliman Elhaj <http://facebook.com/elbagers> <http://linkedin.com/in/elbagers> <http://instagram.com/elbagers>

…

On Fri, Jul 24, 2026, 1:26 AM Ali Tarek Hrhera ***@***.***> wrote: *alihrhera* left a comment (nextcloud/android#17371) <#17371 (comment)> Could you please provide a list of the file names associated with the crash, if available? — Reply to this email directly, view it on GitHub <#17371?email_source=notifications&email_token=A223B55EORIRCOIOEYU4P7T5GLXPDA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBWGY2DKMJWHA32M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5066451687>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A223B537Z25G5ISFBVSOGJ35GLXPDAVCNFSNUABEKJSXA33TNF2G64TZHM3DANJWGE4DGNB3JFZXG5LFHM2DSNRVGMZDKNJUHCQXMAQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[alperozturk96]

@elbagers Hey,

Once the QA APK generated from PR could you please try?

#17390