On Thu, Aug 27, 2020 at 11:52:50AM +0800, kernel test robot wrote: > > First bad commit (maybe != root cause): > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > master > head: 15bc20c6af4ceee97a1f90b43c0e386643c071b4 > commit: 5fb8ef25803ef33e2eb60b626435828b937bed75 crypto: chacha - move > existing library code into lib/crypto > date: 9 months ago > config: i386-randconfig-r015-20200827 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 > reproduce (this is a W=1 build): > git checkout 5fb8ef25803ef33e2eb60b626435828b937bed75 > # save the attached .config to linux build tree > make W=1 ARCH=i386 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <l...@intel.com> > > All warnings (new ones prefixed by >>): > > lib/crypto/chacha.c: In function 'chacha_permute': > >> lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger > >> than 1024 bytes [-Wframe-larger-than=] > 65 | } > | ^
This doesn't happen with a normal configuration. To recreate this warning, you need to enable both GCOV_KERNEL and UBSAN. This is the minimal gcc command-line to recreate it: gcc -Wframe-larger-than=1024 -fprofile-arcs -fsanitize=object-size -c -O2 chacha.c If you take away either profile-arcs or sanitize=object-size then the problem goes away. Any suggestions? Thanks, -- Email: Herbert Xu <herb...@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
