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From:   richard clark <richard.xnu.clark@gmail.com>
Date:   Tue, 30 Jun 2020 16:34:17 +0800
Message-ID: <CAJNi4rNvzQ4Eqzxo-OokF+zfOvJ=kKUMUVGt8osji0mcaaxhkQ@mail.gmail.com>
Subject: External kmod build failed on KASAN-enabled kernel
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

The same kmod source code can be built on KASAN-disabled kernel
(5.7.0), but after enable it with CONFIG_KASAN=y, the kmod can't build
on the new installed KASAN-enabled kernel with below error message,
seems no relevant answers for this issue with google:

root@build-ws:/home/mm/slab# make

make -C /lib/modules/5.7.0/build M=/home/mm/slab modules

make[1]: Entering directory '/home/linux-5.7'

  CC [M]  /home/mm/slab/tap_slab.o

  MODPOST 1 modules

ERROR: modpost: "__asan_register_globals" [/home/mm/slab/tap_slab.ko] undefined!

ERROR: modpost: "__asan_unregister_globals"
[/home/mm/slab/tap_slab.ko] undefined!

ERROR: modpost: "__asan_load8_noabort" [/home/mm/slab/tap_slab.ko] undefined!

scripts/Makefile.modpost:94: recipe for target '__modpost' failed

make[2]: *** [__modpost] Error 1

Makefile:1642: recipe for target 'modules' failed

make[1]: *** [modules] Error 2

make[1]: Leaving directory '/home/linux-5.7'

Makefile:6: recipe for target 'default' failed

make: *** [default] Error 2
===
Regards,
Richard