Hi Herbert, I got the attached error report. This is due to CRYPTO_HASH2 is selected as m whereas security/keys/dh.c is compiled as y. Note CRYPTO_HASH is selected as y. dh.c requires shash. Kconfig for dh.c contains: config KEY_DH_OPERATIONS bool "Diffie-Hellman operations on retained keys" depends on KEYS select MPILIB select CRYPTO_HASH Shall I select CRYPTO_HASH2 instead or in addition to CRYPTO_HASH? Thanks. Ciao Stephan ---------- Weitergeleitete Nachricht ---------- Betreff: [linux-next:master 7274/8070] undefined reference to `crypto_alloc_shash' Datum: Donnerstag, 6. April 2017, 10:03:30 CEST Von: kbuild test robot <fengguang.wu@xxxxxxxxx> An: Stephan Mueller <smueller@xxxxxxxxxx> Kopie: kbuild-all@xxxxxx, David Howells <dhowells@xxxxxxxxxx> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: d203084e692ac2f656cf8c50449f8f90ca7875de commit: f1c316a3ab9d24df6022682422fe897492f2c0c8 [7274/8070] KEYS: add SP800-56A KDF support for DH config: x86_64-randconfig-s0-04061437 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout f1c316a3ab9d24df6022682422fe897492f2c0c8 # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): security/built-in.o: In function `__keyctl_dh_compute': >> (.text+0xa4f7): undefined reference to `crypto_alloc_shash' security/built-in.o: In function `__keyctl_dh_compute': >> (.text+0xa7b5): undefined reference to `crypto_shash_update' security/built-in.o: In function `__keyctl_dh_compute': (.text+0xa7ed): undefined reference to `crypto_shash_update' security/built-in.o: In function `__keyctl_dh_compute': >> (.text+0xa832): undefined reference to `crypto_shash_final' security/built-in.o: In function `__keyctl_dh_compute': (.text+0xa881): undefined reference to `crypto_shash_final' security/built-in.o: In function `__keyctl_dh_compute': >> (.text+0xa9bd): undefined reference to `crypto_destroy_tfm' --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -------------------------------------------------------------