Thanks for reporting and sorry for the trouble you're experiencing!

Can you please estimate how many bookmarks you've got? Can you provide more details about how they are duplicated? Do all or most bookmarks have exactly one duplicate? Do they have multiple?

Please also attach a screenshot for chrome://sync-internals.

It is always with this account.
400 roughly total.
At least 4 duplicates existed for each.
It will keep duplicating until chrome sync hits ‘throttled’.

This past couple days it went up over 16,000.
I exported my bookmarks. Reset my sync data online. Deleted all bookmarks using extensions as chrome was now crashing. Deleted all bookmarks from my phone, Chrome wasn’t crashing. I imported my export of bookmarks. Used extensions to sort and remove duplicate/dead bookmarks. Reenabled sync on phone and pc. No issues so far.

I have to experience with chromes internal syncing processes. I can usually narrow down an issue like this but I can’t see any common thing that I have done to make this happen?

Sorry, didn’t screenshot any sync-Internal’s this time. Bookmarks was throttled and well over 16,000 and counting before I did the above.

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Thanks for following up. A few more questions:
1. Are those duplicates within the same parent folder? Or do you have "parallel" bookmark trees?

2. Do you use bookmark folders? Have you renamed folders?

3. Have you installed any extension that interacts with bookmarks?

Thanks!

1. Duplicates where in every folder except for mobile bookmarks.

2. I use bookmark folders. When I had 16,000 bookmarks I had around 8,000 folders as well. I change and rename things all the time.

3. I hadn’t installed any extensions that interact with bookmarks until I had duplicates. I use SuperSorter to clear out duplicates.

Thanks! Here's one possible explanation:
1. If you rename a folder after a restart of the browser, within ~10 seconds, we'll do it before sync has started.
2. When sync starts, it associates local bookmarks with remote bookmarks. For folders, the matching is done based on name.
3. This means an early rename can cause a duplicate subtree.

Another similar scenario is turning sync off and on again. If you rename a folder while sync is off, you'd run into the same issue.

This is a design flaw of the current implementation for bookmarks sync. We are working on a better replacement, tracked in https://bugs.chromium.org/p/chromium/issues/detail?id=889819.

If my hypothesis above matches your case, I'd close this bug and would ask you to wait a few months until we polish and roll out the new implementation (although it probably won't immediately change the behavior for the case where you disable sync and reenable it).

I have experienced all of this but I think it most resembles the association gone wrong. Seems like a thing where it might be checking a serial number vs what the folder/bookmark is named.

I'll follow the update coming.

Oh, no. I won't. I need permission.

started again

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