the code review in question is at https://chromium-review.googlesource.com/c/466306

Looking at 466306 there are 4-7 mailing lists CC'd on the change. I wonder if each of those is receiving a separate message.

That's the theory. I've asked awdf to attach a screenshot of the To: lines of the emails to see if that's visible there.

Adding hiesel@ and bumping priority and milestone.

And here are the recipients of some of those emails received at 15:43 - see screenshot

Deleted: to-lines.png 139 KB

	to-lines.png 139 KB View Download

(seems to be the same set of recipients just in a different order)

Yep. One other question: are you subscribed to ntp-dev@, feature-media-reviews@, and/or sync-reviews@?

We certainly shouldn't be sending multiple emails to each recipient. If we are, that needs to be fixed asap. But there's also a reasonable chance that we're only sending one email, but you're receiving it up to five times via five different routes:
1) to you as the uploader
2) to you as awdf+watch@
3) to you via sync-reviews@
4) to you via ntp-dev+reviews@
5) to you via feature-media-reviews@

I don't think I am subscribed to any of those three (how would I tell for sure?)

I thought this is the same problem as gerrit 2.13? But that was fixed in https://gerrit-review.googlesource.com/#/c/99178/ but never added in master since they are planning on doing the fix a different way for 2.14+.

I think https://bugs.chromium.org/p/gerrit/issues/detail?id=5956 is proibably the same issue as this but since this hasn't happened to me directly I can't confirm.

awdf: you can tell if you're subscribed by visiting the Google Groups page for the group (e.g. https://groups.google.com/a/chromium.org/forum/#!forum/sync-reviews) and seeing if it says you're subscribed.

Can confirm I am not a member of sync-reviews, ntp-dev, or feature-media-reviews mailing lists.

I've added a test case to Gerrit to check the scenario you described, but I need to look further as those tests went as expected (only one email sent out in each case): https://gerrit-review.googlesource.com/c/103252/

Did the duplicate emails you got all have the same message ID?

How do I tell what message ID the emails have?

I don't think I'm the only one with code reviews affected by this issue.

Searching my inbox for 'gerrit' brought up these two reviews with 48 and 63 emails respectively, many of them identical:
https://chromium-review.googlesource.com/472428
https://chromium-review.googlesource.com/472548

(emails sent to my awdf+watch@chromium.org account since I'm watching areas they changed)

Thanks for linking those changes.

This problem originates in how the chromium client adds CCs. Instead of adding them as a batch in one operation, they are added individually over several minutes. This is what generates these emails.

This problem is tracked in  Issue 710028 .

Logan, could you please move this to chromium and mark it is a duplicate of 710028? I am lacking permissions to do so.

Moved issue gerrit:5931 to now be  issue chromium:711745 .