lkml.org 
[lkml]   [2020]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes
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 <lkp@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 <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

\
 
 \ /
  Last update: 2020-08-27 10:07    [W:0.084 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site