Do not set `slub_debug=FZ` / `slub_debug=ZF`?

[adrelanos]

Quote:

# Enable SLUB redzoning and sanity checking (slow; requires CONFIG_SLUB_DEBUG=y above).
slub_debug=ZF

It results in an ominous kernel warning message.

[    0.587254] **********************************************************
[    0.587257] **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
[    0.587257] **                                                      **  
[    0.587257] ** This system shows unhashed kernel memory addresses   **  
[    0.587258] ** via the console, logs, and other interfaces. This    **  
[    0.587258] ** might reduce the security of your system.            **  
[    0.587258] **                                                      **  
[    0.587258] ** If you see this message and you are not debugging    **  
[    0.587259] ** the kernel, report this immediately to your system   **  
[    0.587259] ** administrator!                                       **  
[    0.587259] **                                                      **  
[    0.587259] **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **  
[    0.587260] **********************************************************

After removing slub_debug=FZ from the kernel command line, this warning no longer showed up in journal.

[kees]

This is expected and unfortunate since v5.14. It is, however, fixed in v6.17 with commit torvalds/linux@de1c831.