Re: [stable:linux-4.19.y 984/6017] ld.lld: error: drivers/usb/dwc2/platform.o: contains a compressed section, but zlib is not available

From: Nick Desaulniers <ndesaulniers@google.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: oe-kbuild-all@lists.linux.dev,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	John Keeping <john@metanate.com>,
	llvm@lists.linux.dev,  kernel test robot <lkp@intel.com>
Subject: Re: [stable:linux-4.19.y 984/6017] ld.lld: error: drivers/usb/dwc2/platform.o: contains a compressed section, but zlib is not available
Date: Thu, 25 May 2023 14:21:24 -0700	[thread overview]
Message-ID: <CAKwvOd=QY_QNWP2+nofvowbCD66noajsY8q1xe-MamV_gF3TPA@mail.gmail.com> (raw)
In-Reply-To: <202305251508.iFEInYVW-lkp@intel.com>

On Thu, May 25, 2023 at 12:44 AM kernel test robot <lkp@intel.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.19.y
> head:   3f57fb8b1bd06b277556601133823bec370d723f
> commit: c964b1bbf179a163084b1ec8ad094b8c8dce28c8 [984/6017] usb: dwc2: hcd_queue: Fix use of floating point literal
> config: x86_64-randconfig-x093-20230524
> compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
> reproduce (this is a W=1 build):
>         mkdir -p ~/bin
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=c964b1bbf179a163084b1ec8ad094b8c8dce28c8
>         git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>         git fetch --no-tags stable linux-4.19.y
>         git checkout c964b1bbf179a163084b1ec8ad094b8c8dce28c8
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/usb/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202305251508.iFEInYVW-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available

Hmmm...that's surprising to see on 4.19.  I didn't add support for
compressed debug info until:

commit 10e68b02c861 ("Makefile: support compressed debug info")

which landed in v5.8-rc1 and AFAIK was never backported.

I wasn't able to reproduce this with ToT LLVM (clang-17); I wonder if
this is an issue with clang-14?

Just tried and could not reproduce.  Has this issue been seen elsewhere?

Ah, we have

https://lore.kernel.org/llvm/?q=contains+a+compressed+section%2C+but+zlib+is+not+available
https://lore.kernel.org/llvm/20230404161735.GA1703291@dev-arch.thelio-3990X/

So since 10e68b02c861 is in v5.8-rc1, then for 4.14, 4.19, and 5.4 we
probably want a stable-only patch for -gz=none.

GCC didn't support -gz=none until 5.1, so that might be an issue for
older branches of stable which might still support older GCC versions.
4.19.y still supports gcc 4.6.

```

diff --git a/Makefile b/Makefile
index 71416fde7348..e6754300021c 100644
--- a/Makefile
+++ b/Makefile
@@ -756,6 +756,7 @@ KBUILD_AFLAGS       += -g
 else
 KBUILD_AFLAGS  += -Wa,-gdwarf-2
 endif
+KBUILD_CFLAGS  += $(call cc-option, -gz=none)
 endif

 ifdef CONFIG_DEBUG_INFO_DWARF4
```

Godbolt only binutils v2.27+, but 4.19 supported v2.20+ (so I can't
check --compress-debug-sections=none assembler support quickly).


>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
>    ld.lld: error: drivers/usb/dwc2/core_intr.o: contains a compressed section, but zlib is not available
> >> ld.lld: error: drivers/usb/dwc2/platform.o: contains a compressed section, but zlib is not available
>    ld.lld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki



-- 
Thanks,
~Nick Desaulniers
