How are Linux kernel bugs being tracked?

What an hour of Googling bring out that **mainstream** Linux kernel bugs are being logged in two distinct systems: Mailing list ------------ > This is the Linux kernel development discussion and bug reporting > mailing list. The mailing list is archived by a number of services, *e.g.* - Gmane - lkml - MARC - Mail archive - Indiana Bugzilla -------- > This is the Kernel Tracker system (based on Bugzilla) for posting bugs > against the mainline Linux kernels (not distribution kernels). Distributions, *e.g.* Ubuntu have their own bug tracker which may be set to track upstream bugs. I wonder that, - Are the bugs reported on the either of the services synced back to the other? - Assuming that the mailing list and the bugzilla are not mirrors of each other (*i.e.* those are independent and bugs are *not* synced), how do Linux developers coordinate between the bugs reported across services? - Isn't it inconvenient to refer to the bugs reported to mailing list later on due to not having any bug ID? (I understand that one can refer by a mailing archive URL, however doesn't look professional IMO) - Should a new bug be reported to any one of the services or both?