linux-kernel - net/xfrm/xfrm_policy.c:1286:8: error: variable 'dir' is uninitialized when used here [-Werror,-Wuninitialized]

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Message-ID: <CA+G9fYtemFfuhc7=eNyP3TezM9Euc8sFtHe4GDR4Z9XdHzXSJA@mail.gmail.com>
Date: Fri, 30 Aug 2024 12:15:10 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: clang-built-linux <llvm@...ts.linux.dev>, Netdev <netdev@...r.kernel.org>, 
	open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: Anders Roxell <anders.roxell@...aro.org>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>
Subject: net/xfrm/xfrm_policy.c:1286:8: error: variable 'dir' is uninitialized
 when used here [-Werror,-Wuninitialized]

The x86_64 defconfig builds failed on today's Linux next-20240829
due to following build warnings / errors.

Regressions:
* i386, build
  - clang-18-defconfig
  - clang-nightly-defconfig

* x86_64, build
  - clang-18-lkftconfig
  - clang-18-lkftconfig-compat
  - clang-18-lkftconfig-kcsan
  - clang-18-lkftconfig-no-kselftest-frag
  - clang-18-x86_64_defconfig
  - clang-nightly-lkftconfig
  - clang-nightly-lkftconfig-kselftest
  - clang-nightly-x86_64_defconfig
  - rustclang-nightly-lkftconfig-kselftest

first seen on next-20240829.
  Good: next-20240828
  BAD:  next-20240829

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

build log:
--------
net/xfrm/xfrm_policy.c:1286:8: error: variable 'dir' is uninitialized
when used here [-Werror,-Wuninitialized]
 1286 |                 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
      |                      ^~~
net/xfrm/xfrm_policy.c:1257:9: note: initialize the variable 'dir' to
silence this warning
 1257 |         int dir;
      |                ^
      |                 = 0
1 error generated.

Build Log links,
--------
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240829/testrun/24977652/suite/build/test/clang-18-lkftconfig/log

Build failed comparison:
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240829/testrun/24977652/suite/build/test/clang-18-lkftconfig/history/

metadata:
----
  git describe: next-20240829
  git repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git sha: b18bbfc14a38b5234e09c2adcf713e38063a7e6e
  kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2lKF49FRX1FB3IVv46cfZc30s9y/config
  build url: https://storage.tuxsuite.com/public/linaro/lkft/builds/2lKF49FRX1FB3IVv46cfZc30s9y/
  toolchain: clang-18 and clang-nightly
  config: defconfig

Steps to reproduce:
---------
 - tuxmake --runtime podman --target-arch x86_64 --toolchain clang-18
--kconfig defconfig LLVM=1 LLVM_IAS=1

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