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.