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Date: Sat, 3 Feb 2024 00:23:33 -0600
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Subject: Re: [PATCH 6.1 000/219] 6.1.77-rc1 review
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org
Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org,
 torvalds@linux-foundation.org, akpm@linux-foundation.org,
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 mathias.nyman@linux.intel.com
References: <20240203035317.354186483@linuxfoundation.org>
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From: =?UTF-8?Q?Daniel_D=C3=ADaz?= <daniel.diaz@linaro.org>
In-Reply-To: <20240203035317.354186483@linuxfoundation.org>
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Hello!

On 02/02/24 10:02 p. m., Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 6.1.77 release.
> There are 219 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 Mon, 05 Feb 2024 03:51:47 +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-6.1.77-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-6.1.y
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h

We're seeing lots of build problems and warnings with Clang 17 and Clang nightly:

-----8<-----
   /builds/linux/drivers/usb/host/xhci.c:1684:37: error: variable 'slot_id' is uninitialized when used here [-Werror,-Wuninitialized]
    1684 |                         ret = xhci_check_maxpacket(xhci, slot_id,
         |                                                          ^~~~~~~
   /builds/linux/drivers/usb/host/xhci.c:1652:22: note: initialize the variable 'slot_id' to silence this warning
    1652 |         unsigned int slot_id, ep_index;
         |                             ^
         |                              = 0
   1 error generated.
   make[5]: *** [/builds/linux/scripts/Makefile.build:250: drivers/usb/host/xhci.o] Error 1
----->8-----

Bisection points to:

   commit 37ef029fe9a5639f12250f75f5d1594c6a11e181
   Author: Mathias Nyman <mathias.nyman@linux.intel.com>
   Date:   Fri Dec 1 17:06:47 2023 +0200

       xhci: fix possible null pointer deref during xhci urb enqueue
       
       [ Upstream commit e2e2aacf042f52854c92775b7800ba668e0bdfe4 ]

Reverting the patch makes the build pass.

The problem manifests as build error in i386 and x86_64, and as new warnings on Arm, Arm64, and RISC-V.

Some reproducers:

   tuxmake --runtime podman --target-arch arm --toolchain clang-17 --kconfig omap2plus_defconfig LLVM=1 LLVM_IAS=1
   tuxmake --runtime podman --target-arch x86_64 --toolchain clang-17 --kconfig x86_64_defconfig LLVM=1 LLVM_IAS=1

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


Greetings!

Daniel Díaz
daniel.diaz@linaro.org