I'm flagging this as Critical. It sounds like everyone agrees that the distro patch we're carrying is bad. I think it's possible that it's bad in quite a serious way, so we should investigate immediately without delay until we've understood the severity of this, especially because by carrying the distro patch we should be maintaining it. If it turns out to be benign then we can downgrade the bug importance.
I'm flagging this as Critical. It sounds like everyone agrees that the distro patch we're carrying is bad. I think it's possible that it's bad in quite a serious way, so we should investigate immediately without delay until we've understood the severity of this, especially because by carrying the distro patch we should be maintaining it. If it turns out to be benign then we can downgrade the bug importance.