Yes the version there in /proc/version is from uname -v. The version field in utsname is 64 characters fixed width. This leads to truncation with the longer version on the backport and the very long flags.
Yes the version there in /proc/version is from uname -v. The version field in utsname is 64 characters fixed width. This leads to truncation with the longer version on the backport and the very long flags.