Control: tags -1 + moreinfo Hi Kevin,
On Thu, Oct 02, 2025 at 02:28:48PM +0300, Kevin Lumik wrote: > On Sat, 27 Sep 2025 16:09:08 +0200 Salvatore Bonaccorso > <[email protected]> wrote: > > - Can you temporarily test as well the upper kernels from unstable > > (6.16.8-1 right now, but soonish 6.16.9-1 as well) to see if the > > problem is triggerable there as well? > > I tested the upper kernels and was still able to reproduce the issue on > both 6.16.8-1 and 6.16.9-1. Ok thanks for doing so, have just updated as well the metadata to reflect that. > > Note: If we find the problem is prosent in 6.16.y then we need to find > > the breaking change between 6.1.y and 6.12.y. It might be asier here > > if we first make the range of potential upstream versions more narrow, > > so you might first do a "manual bisect" on Debian revisions (For that > > use the snapshot.debian.org service to retrieve linux-images uploaded > > to Debian. E.g. go down from 6.12 in "major version" steps until we > > have close enough range of broken/fixed upstream major versions. Then > > perform a normal bisect between the upstream versions. > > Using snapshot.debian.org I have determined that the breaking change was > introduced between 6.11.10 (tested 6.11.10-1) and 6.12 (tested 6.12.3-1 > and 6.12~rc6-1~exp1). > > Thank you for your assistance. Let me know what would be the next step. Okay so we have a good range to look at. The next steps would be to bisect the changes. Actually it would be good to first test 6.11 itself upstream. So the steps to do would be roughly the following, which needs compiling and testing a few kernels: git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git cd linux-stable git checkout v6.11 cp /boot/config-$(uname -r) .config yes '' | make localmodconfig make savedefconfig mv defconfig arch/x86/configs/my_defconfig # test 6.11 to ensure this is "good" make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm it successfully boots / problem does not exist # test 6.12-rc6 to ensure this is "bad" git checkout v6.12-rc6 make my_defconfig make -j $(nproc) bindeb-pkg ... install the resulting .deb package and confirm it fails to boot / problem exists With that confirmed, the bisection can start: git bisect start git bisect good v6.11 git bisect bad v6.12-rc6 In each bisection step git checks out a state between the oldest known-bad and the newest known-good commit. In each step test using: make my_defconfig make -j $(nproc) bindeb-pkg ... install, try to boot / verify if problem exists and if the problem is hit run: git bisect bad and if the problem doesn't trigger run: git bisect good . Please pay attention to always select the just built kernel for booting, it won't always be the default kernel picked up by grub. Iterate until git announces to have identified the first bad commit. Then provide the output of git bisect log In the course of the bisection you might have to uninstall previous kernels again to not exhaust the disk space in /boot. Also in the end uninstall all self-built kernels again. Hope this helps so far? Regards, Salvatore
