linux-kernel - clang-nightly: ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

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Message-ID: <CA+G9fYuQHeGicnEx1d=XBC0p1LCsndi5q0p86V7pCZ02d8Fv_w@mail.gmail.com>
Date: Wed, 2 Apr 2025 17:51:48 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: clang-built-linux <llvm@...ts.linux.dev>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, 
	linux-s390@...r.kernel.org, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, samba-technical@...ts.samba.org, 
	linux-cifs@...r.kernel.org
Cc: Steve French <sfrench@...ba.org>, bharathsm@...rosoft.com, 
	Linus Torvalds <torvalds@...ux-foundation.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Nathan Chancellor <nathan@...nel.org>, Shyam Prasad N <sprasad@...rosoft.com>
Subject: clang-nightly: ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

Regressions on arm, powerpc, s390 defconfig builds failed with
toolchain clang-nightly on the mainline master branch.

First seen on the v6.14-12245-g91e5bfe317d8
 Good: v6.14-11270-g08733088b566
 Bad: v6.14-12245-g91e5bfe317d8

Regressions found on arm:
  - build/clang-nightly-nhk8815_defconfig

Regressions found on powerpc:
  - build/clang-nightly-lkftconfig-lto-full
  - build/clang-nightly-ppc64e_defconfig
  - build/clang-nightly-lkftconfig-lto-thing
  - build/clang-nightly-defconfig
  - build/clang-nightly-lkftconfig-hardening

Regressions found on s390:
  - build/clang-nightly-lkftconfig-lto-thing
  - build/clang-nightly-lkftconfig-lto-full
  - build/clang-nightly-defconfig
  - build/clang-nightly-lkftconfig-hardening


Regression Analysis:
 - New regression? Yes
 - Reproducibility? Yes

Build regression: arm powerpc s390 modpost "wcslen" fs smb client
cifs.ko undefined

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Build log

ERROR: modpost: "wcslen" [fs/smb/client/cifs.ko] undefined!

## Source
* Kernel version: 6.14.0
* Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
* Git sha: 91e5bfe317d8f8471fbaa3e70cf66cae1314a516
* Git describe: v6.14-12245-g91e5bfe317d8
* Project details:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.14-12245-g91e5bfe317d8/
* Arcitures: arm, powerpc, s390
* Toolchains: clang-nightly

## Build
* Build log: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.14-12245-g91e5bfe317d8/testrun/27856145/suite/build/test/clang-nightly-nhk8815_defconfig/log
* Build history:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.14-12245-g91e5bfe317d8/testrun/27856145/suite/build/test/clang-nightly-nhk8815_defconfig/history/
* Build details:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.14-12245-g91e5bfe317d8/testrun/27856145/suite/build/test/clang-nightly-nhk8815_defconfig/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2v9EdO7KHQCCZBICM0MvpaTUbLm/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2v9EdO7KHQCCZBICM0MvpaTUbLm/config

## Steps to reproduce
 - tuxmake --runtime podman --target-arch arm --toolchain
clang-nightly --kconfig nhk8815_defconfig LLVM=1 LLVM_IAS=1
 - tuxmake --runtime podman --target-arch powerpc --toolchain
clang-nightly --kconfig defconfig LLVM=1 LLVM_IAS=0
LD=powerpc64le-linux-gnu-ld
 - tuxmake --runtime podman --target-arch s390 --toolchain
clang-nightly --kconfig defconfig LLVM_IAS=1

--
Linaro LKFT
https://lkft.linaro.org