[root@f24m ~]# grep SLUB_DEBUG /boot/config-4.8.0-0.rc1.git0.1.fc25.x86_64
CONFIG_SLUB_DEBUG=y
# CONFIG_SLUB_DEBUG_ON is not set

When I boot with slub_debug=1, I get this at boot time:

[    0.000000] slub_debug option '1' unknown. skipped

https://fedoraproject.org/wiki/KernelDebugStrategy says under Release section:

In addition, SLUB_DEBUG is enabled, but by default is inactive. You
need to boot with slub_debug=1 to make it perform its usual checks.

https://www.kernel.org/doc/Documentation/vm/slub.txt suggests multiple
possible options, but I'm not sure which one(s) make it boot
functionally like a debug kernel.



-- 
Chris Murphy
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