[Buildroot] [Bug 14916] New: build buildroot with glibc and linux kernel 5.4 will cause error: "FATAL: kernel too old"

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14916

            Bug ID: 14916
           Summary: build buildroot with glibc and linux kernel 5.4 will
                    cause error: "FATAL: kernel too old"
           Product: buildroot
           Version: 2022.02.3
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: tgeh23 at qq.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

Refer to this article for details: https://www.jianshu.com/p/55952ae88965

1. qemu start error
[ 3.405278] Run /sbin/init as init process
FATAL: kernel too old
[ 3.484534] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00007f00
[ 3.484974] CPU: 0 PID: 1 Comm: init Not tainted 5.4.195 #1

2. environment
host          arch    linux kernel       buildroot  glibc
ubuntu 20.04  x86_64  5.4.0-195/5.4.195  2022.02.3  2.34

3. error analysis
- buildroot set `BR2_TOOLCHAIN_HEADERS_AT_LEAST` to `5.4`
- but glibc's `--enable-kernel=X.Y.Z`
- buildroot missing `Z`

4. temporary solution
modify buildroot's .config `BR2_TOOLCHAIN_HEADERS_AT_LEAST` to `5.4.0`

5. recompile and start ok

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