this post was submitted on 04 Mar 2024

1 points (100.0% liked)

Sync for Lemmy

15148 readers

3 users here now

👀

Welcome to Sync for Lemmy!

Download Sync for Lemmy

Welcome to the official Sync for Lemmy community.

The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:

Community Rules

1- No advertising or spam.

All types of advertising and spam are restricted in this community.

Community Credits

Artwork and community banner by: @[email protected]

founded 1 year ago

MODERATORS

[email protected]

[BUG] Sync Crashing after lemmy.world 0.19 update (lemmy.world)

submitted 8 months ago by [email protected] to c/[email protected]

15 comments fedilink hide all child comments

On my "subscribed" page, if I scroll down, the app crashes. Not sure of anything more than that. But it's definitely repeatable for me.

Device information

Sync version: v23.11.29-22:27    
Sync flavor: googlePlay    

View type: Smaller cards    

Device: ASUS_AI2302    
Model: asus ASUS_AI2302    
Android: 14

all 16 comments

sorted by: hot top controversial new old

[–] [email protected] 0 points 8 months ago* (last edited 8 months ago) (1 children)

Test link Test

This is a test link to see if it is the image

Edit: Image loads fine from direct image link.

[–] [email protected] 0 points 8 months ago

Test link 2 Test

This is a test link to see if it is the image with webp

[–] [email protected] 0 points 8 months ago (1 children)

It looks like someone has posted a malformed image that is causing the issue.

[–] [email protected] 0 points 8 months ago (2 children)

It's this post

This crashes for me

[–] [email protected] 0 points 8 months ago

If you block the user, it seems to fix the problem,, but you'll have to block them on another app, or via browser, obviously.

Pain in the ass

[+] [email protected] 0 points 8 months ago* (last edited 7 months ago) (1 children)

[removed by mod]

[–] [email protected] 0 points 8 months ago* (last edited 8 months ago) (1 children)

Not exactly a crash but it refreshed back to the main page but a few posts away from this one.

That's what happened to me. Repeated attempts to load it made a prompt to clear cache appear. I haven't had a full crash yet. Maybe there's other offending posts. This one is in thee communities though so it could hit a lot of people.

Edit: it's something to do with the user. They made another post in cryptography that breaks sync for me too.

They're on a different activitypub platform.

[–] [email protected] 0 points 8 months ago (1 children)

I'd be cautious.

These malformed images may be malicious.

A malformed image should not cause a crash. I'm not sure what libraries Sync uses for this stuff, but the bug should be reported upstream (assuming it's not just some exception mishandling going on in Sync.)

[–] [email protected] 0 points 8 months ago (1 children)

I don't think this has anything to do with malicious images. From my crash logs, it looks like a simple database inconsistency issue:

 E AndroidRuntime: FATAL EXCEPTION: main
 E AndroidRuntime: Process: io.syncapps.lemmy_sync, PID: 6602
 E AndroidRuntime: java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
 E AndroidRuntime:        at uc.a.d(Unknown Source:49)
L E AndroidRuntime:        at a9.a.containsKey(Unknown Source:2)
 E AndroidRuntime:        at z8.p.k(Unknown Source:2)
L E AndroidRuntime:        at wc.e.x0(Unknown Source:8)
 E AndroidRuntime:        at wc.e.E(Unknown Source:7)
 E AndroidRuntime:        at xc.d$g$a.a(Unknown Source:3)
 E AndroidRuntime:        at xc.d$g$a.onLoadComplete(Unknown Source:2)
 E AndroidRuntime:        at android.content.Loader.deliverResult(Loader.java:157)
 E AndroidRuntime:        at android.content.CursorLoader.deliverResult(CursorLoader.java:117)
 E AndroidRuntime:        at android.content.CursorLoader.deliverResult(CursorLoader.java:47)                 03-04  E AndroidRuntime:        at android.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:274)
 E AndroidRuntime:        at android.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:97) 
 E AndroidRuntime:        at android.os.AsyncTask.finish(AsyncTask.java:771)
 E AndroidRuntime:        at android.os.AsyncTask.-$$Nest$mfinish(Unknown Source:0)
 E AndroidRuntime:        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)
 E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:201)
 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:288)
 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:7937)
 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:854)

[–] [email protected] 0 points 8 months ago (1 children)

They're on a platform I don't recognise.

[–] [email protected] 0 points 8 months ago

I'm guessing that a non-Lemmy server doesn't provide some optional fields that Lemmy servers always provide, or that it provides some unexpected but valid data points in the API. The API docs aren't exactly very detailed, so I wouldn't be surprised if LJD assumed some optional field to always be present (because on every post on Lemmy that has been the case).

I took a look at the JSON Lemmy generates and it seems perfectly fine. Unfortunately, Sync is obfuscated so I can't get a clue at what object is malformed in the database to see what could be causing this.

[–] [email protected] 0 points 8 months ago* (last edited 8 months ago) (2 children)

It's not lemmy.world, there's a bad post that is crashing sync for users across instances. It's a sync bug.

It was reported here https://midwest.social/post/9381826 but the comments in that will now crash sync too.

[–] [email protected] 0 points 8 months ago

Thanks. I couldn't figure out why my Sync was crashing all day

[–] [email protected] 0 points 8 months ago (2 children)

Ah. So it's just coincidence that lemmy.world updated to 0.19 today too?

[–] [email protected] 0 points 8 months ago

I've been running .19 on my instance for a while now and recently upgraded to .19.3 and haven't had any crashing on Sync.

[–] [email protected] 0 points 8 months ago

Yes, sh.itjust.works updated Friday and I hadn't encountered anything until now