Regressions on qemu-x86_64 with clang-20 and clang-nightly on the Linux next-20250407 and no console output.
The gcc-13 builds boot pass on qemu-x86_64.
First seen on the next-20250407. Bad: next-20250407 Good:next-20250404
* qemu-x86_64, boot - boot/clang-20-lkftconfig - boot/clang-20-lkftconfig-compat - boot/clang-nightly-lkftconfig
Regression Analysis: - New regression? Yes - Reproducibility? Yes
Boot regression: qemu_x86_64 clang-20, clang-nightly no console log Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Boot log <no console output>
Clang-20 versions: "name": "clang", "version": "20.1.2", "version_full": "Debian clang version 20.1.2 (++20250330123306+5ba194972878-1~exp1~20250330003423.94)"
Clang-nightly versions: "name": "clang", "version": "21.0.0", "version_full": "Debian clang version 21.0.0 (++20250402105505+c57b9c233a87-1~exp1~20250402225526.1363)"
qemu-system-x86: installed at version: 9.2.2+ds-1+b2
## Source * Kernel version: 6.15.0-rc1-next-20250407 * Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: 2bdde620f7f2bff2ff1cb7dc166859eaa0c78a7c * Git describe: 6.15.0-rc1-next-20250407 * Project details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/
## Test * Test log: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/tes... * Test details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/tes... * Test history: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/tes... * Test history: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/tes... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2vNpFdnHoEolEu77VmTYD... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2vNpFdnHoEolEu77VmTYD...
-- Linaro LKFT https://lkft.linaro.org
On Mon, 7 Apr 2025 at 17:15, Naresh Kamboju naresh.kamboju@linaro.org wrote:
Regressions on qemu-x86_64 with clang-20 and clang-nightly on the Linux next-20250407 and no console output.
The gcc-13 builds boot pass on qemu-x86_64.
First seen on the next-20250407. Bad: next-20250407 Good:next-20250404
- qemu-x86_64, boot
- boot/clang-20-lkftconfig
- boot/clang-20-lkftconfig-compat
- boot/clang-nightly-lkftconfig
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Boot regression: qemu_x86_64 clang-20, clang-nightly no console log Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Anders bisected this and found, # first bad commit: [cc34e658c6db493c1524077e95b42d478de58f2b] x86/boot: Move the early GDT/IDT setup code into startup/
Lore report link, - https://lore.kernel.org/all/CA+G9fYt4VVa3kUDR+ze05xM+fRmMBVfbBTsypUq5oOpAfuz...
- Naresh
On Mon, 7 Apr 2025 at 18:17, Naresh Kamboju naresh.kamboju@linaro.org wrote:
On Mon, 7 Apr 2025 at 17:15, Naresh Kamboju naresh.kamboju@linaro.org wrote:
Regressions on qemu-x86_64 with clang-20 and clang-nightly on the Linux next-20250407 and no console output.
The gcc-13 builds boot pass on qemu-x86_64.
First seen on the next-20250407. Bad: next-20250407 Good:next-20250404
- qemu-x86_64, boot
- boot/clang-20-lkftconfig
- boot/clang-20-lkftconfig-compat
- boot/clang-nightly-lkftconfig
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Boot regression: qemu_x86_64 clang-20, clang-nightly no console log Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Anders bisected this and found, # first bad commit: [cc34e658c6db493c1524077e95b42d478de58f2b] x86/boot: Move the early GDT/IDT setup code into startup/
Lore report link,
Thanks for the report. I'll look into this.
* Ard Biesheuvel ardb@kernel.org wrote:
On Mon, 7 Apr 2025 at 18:17, Naresh Kamboju naresh.kamboju@linaro.org wrote:
On Mon, 7 Apr 2025 at 17:15, Naresh Kamboju naresh.kamboju@linaro.org wrote:
Regressions on qemu-x86_64 with clang-20 and clang-nightly on the Linux next-20250407 and no console output.
The gcc-13 builds boot pass on qemu-x86_64.
First seen on the next-20250407. Bad: next-20250407 Good:next-20250404
- qemu-x86_64, boot
- boot/clang-20-lkftconfig
- boot/clang-20-lkftconfig-compat
- boot/clang-nightly-lkftconfig
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Boot regression: qemu_x86_64 clang-20, clang-nightly no console log Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Anders bisected this and found, # first bad commit: [cc34e658c6db493c1524077e95b42d478de58f2b] x86/boot: Move the early GDT/IDT setup code into startup/
Lore report link,
Thanks for the report. I'll look into this.
I've zapped cc34e658c6db from tip:x86/boot for the time being.
I have the same request as for the other patches applies, please split it up into ~3 patches for better bisectability and ease of review:
- first the mechanic movement of code, with very few changes (if the result builds & boots),
- then drop the RIP_REL_REF() uses in the second patch,
- and drop __head annotations in the third patch.
Thanks,
Ingo
-
Ard Biesheuvel -
Ingo Molnar -
Naresh Kamboju