Re: [PATCH 6.15 000/187] 6.15.8-rc1 review

[Naresh Kamboju <naresh.kamboju@linaro.org>]

On Tue, 22 Jul 2025 at 19:37, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> This is the start of the stable review cycle for the 6.15.8 release.
> There are 187 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Thu, 24 Jul 2025 13:43:10 +0000.
> Anything received after that time might be too late.
>
> The whole patch series can be found in one patch at:
>         https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.15.8-rc1.gz
> or in the git tree and branch at:
>         git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.15.y
> and the diffstat can be found below.
>
> thanks,
>
> greg k-h

Regressions while building allyesconfig build for arm64 and x86 with the
toolchain clang-nightly version 22.0.0.

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

Build regression: arm64 x86 mm ksm.c error variable 'output' is used
uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
Build regression: arm64 x86 samsung s5p_mfc_cmd_v6.c error variable
'h2r_args' is uninitialized when passed as a const pointer argument
here
Build regression: arm64 x86 mediatek mcu.c error variable 'hdr' is
uninitialized when passed as a const pointer argument here
Build regression: arm64 x86 broadcom phy_lcn.c error variable
'diq_start' is uninitialized when passed as a const pointer argument
here
Build regression: arm64 x86 usb cxacru.c error variable 'bp' is used
uninitialized whenever 'if' condition is false
Build regression: arm64 x86 drm dpu_plane.c error variable
'crtc_state' is used uninitialized whenever 'if' condition is false
Build regression: arm64 x86 drm amdgpu imu_v12_0.c error variable
'data' is uninitialized when used here

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

## Build log
mm/ksm.c:3674:11: error: variable 'output' is used uninitialized
whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
 3674 |         else if (ksm_advisor == KSM_ADVISOR_SCAN_TIME)
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c:45:7: error:
variable 'h2r_args' is uninitialized when passed as a const pointer
argument here [-Werror,-Wuninitialized-const-pointer]
   45 |                                         &h2r_args);
      |                                          ^~~~~~~~

drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c:133:7: error:
variable 'h2r_args' is uninitialized when passed as a const pointer
argument here [-Werror,-Wuninitialized-const-pointer]
  133 |                                         &h2r_args);
      |                                          ^~~~~~~~

drivers/media/platform/samsung/s5p-mfc/s5p_mfc_cmd_v6.c:148:7: error:
variable 'h2r_args' is uninitialized when passed as a const pointer
argument here [-Werror,-Wuninitialized-const-pointer]
  148 |                                         &h2r_args);
      |                                          ^~~~~~~~

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:3365:21: error:
variable 'hdr' is uninitialized when passed as a const pointer
argument here [-Werror,-Wuninitialized-const-pointer]
 3365 |         skb_put_data(skb, &hdr, sizeof(hdr));
      |                            ^~~

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:1875:21: error:
variable 'hdr' is uninitialized when passed as a const pointer
argument here [-Werror,-Wuninitialized-const-pointer]
 1875 |         skb_put_data(skb, &hdr, sizeof(hdr));
      |                            ^~~

drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c:2728:13:
error: variable 'diq_start' is uninitialized when passed as a const
pointer argument here [-Werror,-Wuninitialized-const-pointer]
 2728 |
&diq_start, 1, 16, 69);
      |                                                       ^~~~~~~~~

drivers/usb/atm/cxacru.c:1104:6: error: variable 'bp' is used
uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
 1104 |         if (instance->modem_type->boot_rom_patch) {
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c:1066:6: error: variable
'crtc_state' is used uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
 1066 |         if (plane_state->crtc)
      |             ^~~~~~~~~~~~~~~~~

drivers/gpu/drm/amd/amdgpu/imu_v12_0.c:374:30: error: variable 'data'
is uninitialized when used here [-Werror,-Wuninitialized]
  374 |                         program_imu_rlc_ram(adev, data, (const
u32)size);
      |                                                   ^~~~


## Source
* Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
* Git sha: 81bcc8b99854ba689a8c85fb1d39d5acdce0385a
* Git describe: v6.15.7-188-g81bcc8b99854
* Architectures: arm64 x86
* Toolchains: Debian clang version 22.0.0
(++20250721112855+43a829a7e894-1~exp1~20250721112913.1588)
* Kconfigs: allyesconfig

## Build
* Build log: https://regressions.linaro.org/lkft/linux-stable-rc-linux-6.15.y/v6.15.7-188-g81bcc8b99854/build/clang-nightly-allyesconfig/
* Build run:  https://regressions.linaro.org/lkft/linux-stable-rc-linux-6.15.y/v6.15.7-188-g81bcc8b99854/testruns/1699830/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/30EaSfe4S6Pi4zE2kv1TGQcGByr/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/30EaSfe4S6Pi4zE2kv1TGQcGByr/config

## Steps to reproduce
* tuxmake --runtime podman --target-arch arm64 --toolchain
clang-nightly --kconfig allyesconfig LLVM=1 LLVM_IAS=1


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