Re: [gcov_module_notifier] WARNING: CPU: 0 PID: 155 at mm/slab_common.c:996 kmalloc_slab+0x1f/0x79

[Peter Oberparleiter]

On 19.04.2018 04:58, Fengguang Wu wrote:
> FYI this happens in mainline kernel 4.17.0-rc1.
> It at least dates back to v4.5 .

This is likely the result of compiling the kernel with GCC 7 while
specifying that gcov-kernel should expect GCC <= 3.4 format data:

dmesg:
> (gcc version 7.3.0 (Debian 7.3.0-1)) #31 Mon Apr 16 23:17:50 CST 2018

.config:
> # CONFIG_GCOV_FORMAT_AUTODETECT is not set
> CONFIG_GCOV_FORMAT_3_4=y
> # CONFIG_GCOV_FORMAT_4_7 is not set

As such, it is an expected test failure. Assuming that this is a
randconfig test, my recommendation would be to blacklist
"CONFIG_GCOV_FORMAT_3_4=y" when using GCC >3.4.

-- 
Peter Oberparleiter
Linux on Z Development - IBM Germany