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Date: Fri, 20 Apr 2018 13:08:07 +0200 From: Peter Oberparleiter <oberpar@...ux.ibm.com> To: Fengguang Wu <fengguang.wu@...el.com> Cc: Arnd Bergmann <arnd@...db.de>, Riku Voipio <riku.voipio@...aro.org>, Frantisek Hrbata <fhrbata@...hat.com>, Masahiro Yamada <yamada.m@...panasonic.com>, linux-kernel@...r.kernel.org, lkp@...org Subject: Re: [gcov_module_notifier] WARNING: CPU: 0 PID: 155 at mm/slab_common.c:996 kmalloc_slab+0x1f/0x79 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
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