Control: found -1 6.12.63-1 Hi Alejandro,
[please keep the Debian bug address as well in the loop, so we have a track on progress and additionally an increased bus factoor] On Wed, Mar 11, 2026 at 12:03:52PM +0100, Alejandro Oliván Alvarez wrote: > On Wed, 2026-03-11 at 11:15 +0100, Salvatore Bonaccorso wrote: > > Control: tags -1 + moreinfo upstream > > > > Hi > > > > On Wed, Mar 11, 2026 at 11:02:42AM +0100, Alejandro Olivan Alvarez > > wrote: > > > Package: linux-image-6.12.73+deb13-amd64 > > > Version: 6.12.73-1 > > > Severity: normal > > > X-Debbugs-Cc: [email protected] > > > > > > Dear Maintainer, > > > > > > * What led up to the situation? > > > apt-get dist-upgrade > > > > > > * What exactly did you do (or not do) that was effective (or > > > ineffective)? > > > reboot to previous linux-image-6.12.41+deb13-amd64 makes > > > networking > > > work again. > > > > > > * What was the outcome of this action? > > > > > > Seems like TCP connections do not work beyond the first > > > connection. > > > For example, two apt-get update commands fail on the second > > > one: > > > > > > root@marcamalaga:~# uname -r > > > 6.12.73+deb13-amd64 > > > root@marcamalaga:~# date > > > Wed Mar 11 10:22:19 AM CET 2026 > > > root@marcamalaga:~# apt-get update > > > Get:1 http://security.debian.org/debian-security trixie-security > > > InRelease > > > [43.4 kB] > > > Hit:2 http://ftp.es.debian.org/debian trixie InRelease > > > Get:3 http://ftp.es.debian.org/debian trixie-updates InRelease > > > [47.3 kB] > > > Hit:4 https://www.deb-multimedia.org trixie InRelease > > > Fetched 90.7 kB in 1s (152 kB/s) > > > Reading package lists... Done > > > root@marcamalaga:~# > > > root@marcamalaga:~# date > > > Wed Mar 11 10:22:28 AM CET 2026 > > > root@marcamalaga:~# > > > root@marcamalaga:~# apt-get update > > > Hit:1 http://security.debian.org/debian-security trixie-security > > > InRelease > > > Hit:2 http://ftp.es.debian.org/debian trixie InRelease > > > Hit:3 http://ftp.es.debian.org/debian trixie-updates InRelease > > > Ign:4 https://www.deb-multimedia.org trixie InRelease > > > Ign:4 https://www.deb-multimedia.org trixie InRelease > > > Ign:4 https://www.deb-multimedia.org trixie InRelease > > > Err:4 https://www.deb-multimedia.org trixie InRelease > > > Cannot initiate the connection to www.deb-multimedia.org:443 > > > (2607:5300:120:e71::1). - connect (101: Network is unreachable) > > > Could not > > > connect to www.deb-multimedia.org:443 (158.69.254.113), connection > > > timed out > > > Cannot initiate the connection to www.deb-multimedia.org:443 > > > (2607:5300:120:e71::1). - connect (101: Network is unreachable) > > > Reading package lists... Done > > > W: Failed to fetch > > > https://www.deb-multimedia.org/dists/trixie/InRelease > > > Cannot initiate the connection to www.deb-multimedia.org:443 > > > (2607:5300:120:e71::1). - connect (101: Network is unreachable) > > > W: Some index files failed to download. They have been ignored, or > > > old ones > > > used instead. > > > root@marcamalaga:~# > > > > > > Similarly, for illustration, here two probes of an HTTP > > > stream, works > > > only once: > > > > > > administrator@marcamalaga:~$ uname -r > > > 6.12.73+deb13-amd64 > > > administrator@marcamalaga:~$ date > > > Wed Mar 11 10:19:23 AM CET 2026 > > > administrator@marcamalaga:~$ ffprobe > > > http://10.20.10.80:8130/malagafmmobile > > > ffprobe version 7.1.3 Copyright (c) 2007-2025 the FFmpeg developers > > > built with gcc 14 (Debian 14.2.0-19) > > > configuration: --disable-decoder=amrnb --disable-gnutls -- > > > disable-liblensfun > > > --disable-libopencv --disable-podpages --disable-sndio --disable- > > > stripping > > > --disable-omx --enable-avfilter --enable-chromaprint --enable- > > > frei0r --enable- > > > gcrypt --enable-gpl --enable-ladspa --enable-libaom --enable- > > > libaribb24 > > > --enable-libass --enable-libbluray --enable-libbs2b --enable- > > > libcaca --enable- > > > libcdio --enable-libcodec2 --enable-libdav1d --enable-libdavs2 -- > > > enable- > > > libdc1394 --enable-libdrm --enable-libdvdnav --enable-libdvdread -- > > > enable- > > > libfdk-aac --enable-libflite --enable-libfontconfig --enable- > > > libfreetype > > > --enable-libfribidi --enable-libgme --enable-libgsm --enable- > > > libharfbuzz > > > --enable-libiec61883 --enable-libilbc --enable-libjack --enable- > > > libjxl > > > --enable-libklvanc --enable-libkvazaar --enable-libmp3lame -- > > > enable-libmysofa > > > --enable-libopencore-amrnb --enable-libopencore-amrwb --enable- > > > libopenh264 > > > --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable- > > > libplacebo > > > --enable-libpulse --enable-librabbitmq --enable-librist --enable- > > > librsvg > > > --enable-librubberband --enable-libshine --enable-libsmbclient -- > > > enable- > > > libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt -- > > > enable-libsvtav1 > > > --enable-libtesseract --enable-libtheora --enable-libtwolame -- > > > enable- > > > libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable- > > > libvorbis > > > --enable-libvpx --enable-libwebp --enable-libwebp --enable-libx264 > > > --enable- > > > libx265 --enable-libxavs2 --enable-libxml2 --enable-libxvid -- > > > enable-libzimg > > > --enable-libzmq --enable-libzvbi --enable-lv2 --enable-nonfree -- > > > enable-openal > > > --enable-opencl --enable-opengl --enable-openssl --enable-postproc > > > --enable- > > > pthreads --enable-shared --enable-version3 -- > > > incdir=/usr/include/x86_64-linux- > > > gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr -- > > > toolchain=hardened > > > --enable-vaapi --enable-libvpl --cc=x86_64-linux-gnu-gcc -- > > > cxx=x86_64-linux- > > > gnu-g++ --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu > > > libavutil 59. 39.100 / 59. 39.100 > > > libavcodec 61. 19.101 / 61. 19.101 > > > libavformat 61. 7.100 / 61. 7.100 > > > libavdevice 61. 3.100 / 61. 3.100 > > > libavfilter 10. 4.100 / 10. 4.100 > > > libswscale 8. 3.100 / 8. 3.100 > > > libswresample 5. 3.100 / 5. 3.100 > > > libpostproc 58. 3.100 / 58. 3.100 > > > Input #0, mp3, from 'http://10.20.10.80:8130/malagafmmobile': > > > Metadata: > > > icy-br : 170 > > > icy-description : : Radio MARCA MA : > > > icy-genre : Sport Radio > > > icy-name : : Radio MARCA MA : > > > icy-pub : 1 > > > icy-url : www.radiomarca.com > > > StreamTitle : > > > Duration: N/A, start: 0.000000, bitrate: 191 kb/s > > > Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 191 > > > kb/s > > > administrator@marcamalaga:~$ > > > administrator@marcamalaga:~$ > > > administrator@marcamalaga:~$ date > > > Wed Mar 11 10:19:44 AM CET 2026 > > > administrator@marcamalaga:~$ ffprobe > > > http://10.20.10.80:8130/malagafmmobile > > > ffprobe version 7.1.3 Copyright (c) 2007-2025 the FFmpeg developers > > > built with gcc 14 (Debian 14.2.0-19) > > > configuration: --disable-decoder=amrnb --disable-gnutls -- > > > disable-liblensfun > > > --disable-libopencv --disable-podpages --disable-sndio --disable- > > > stripping > > > --disable-omx --enable-avfilter --enable-chromaprint --enable- > > > frei0r --enable- > > > gcrypt --enable-gpl --enable-ladspa --enable-libaom --enable- > > > libaribb24 > > > --enable-libass --enable-libbluray --enable-libbs2b --enable- > > > libcaca --enable- > > > libcdio --enable-libcodec2 --enable-libdav1d --enable-libdavs2 -- > > > enable- > > > libdc1394 --enable-libdrm --enable-libdvdnav --enable-libdvdread -- > > > enable- > > > libfdk-aac --enable-libflite --enable-libfontconfig --enable- > > > libfreetype > > > --enable-libfribidi --enable-libgme --enable-libgsm --enable- > > > libharfbuzz > > > --enable-libiec61883 --enable-libilbc --enable-libjack --enable- > > > libjxl > > > --enable-libklvanc --enable-libkvazaar --enable-libmp3lame -- > > > enable-libmysofa > > > --enable-libopencore-amrnb --enable-libopencore-amrwb --enable- > > > libopenh264 > > > --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable- > > > libplacebo > > > --enable-libpulse --enable-librabbitmq --enable-librist --enable- > > > librsvg > > > --enable-librubberband --enable-libshine --enable-libsmbclient -- > > > enable- > > > libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt -- > > > enable-libsvtav1 > > > --enable-libtesseract --enable-libtheora --enable-libtwolame -- > > > enable- > > > libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable- > > > libvorbis > > > --enable-libvpx --enable-libwebp --enable-libwebp --enable-libx264 > > > --enable- > > > libx265 --enable-libxavs2 --enable-libxml2 --enable-libxvid -- > > > enable-libzimg > > > --enable-libzmq --enable-libzvbi --enable-lv2 --enable-nonfree -- > > > enable-openal > > > --enable-opencl --enable-opengl --enable-openssl --enable-postproc > > > --enable- > > > pthreads --enable-shared --enable-version3 -- > > > incdir=/usr/include/x86_64-linux- > > > gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr -- > > > toolchain=hardened > > > --enable-vaapi --enable-libvpl --cc=x86_64-linux-gnu-gcc -- > > > cxx=x86_64-linux- > > > gnu-g++ --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu > > > libavutil 59. 39.100 / 59. 39.100 > > > libavcodec 61. 19.101 / 61. 19.101 > > > libavformat 61. 7.100 / 61. 7.100 > > > libavdevice 61. 3.100 / 61. 3.100 > > > libavfilter 10. 4.100 / 10. 4.100 > > > libswscale 8. 3.100 / 8. 3.100 > > > libswresample 5. 3.100 / 5. 3.100 > > > libpostproc 58. 3.100 / 58. 3.100 > > > [tcp @ 0x561036562fc0] Connection to tcp://10.20.10.80:8130 failed: > > > Connection > > > timed out > > > http://10.20.10.80:8130/malagafmmobile: Connection timed out > > > > > > The problem happens on VIRTUAL MACHINES (PROXMOX 9 guests) > > > using virtio > > > drivers. > > > I have experienced same behaviour on dist-upgraded Bookworm > > > VMs with > > > latest kernel. > > > All VMs worked as expected and are inproduction without any > > > issues > > > before dist-upgrading them. > > > Machines still not dist-upgraded work flawless. > > > The problem is fully consistent with kernel upgrade... just > > > reboot to > > > previous kernel to resume work. > > > > > > * What outcome did you expect instead? > > > Regular operation of the networking stack > > > > I suspect this then depends on the underlaying virtualisation, > > otherwise we would have I think more such reports. As you have a > > fairly straightforward reproducer, can you please bisect the changes > > between 6.12.41 and 6.12.73? (Ideally you test first the kernels > > inbetween up to 6.12.69-1 so we have a closer range, you can get > > other > > images earlier in the archive from the snapshots service. This should > > be done as first step, because there were a a couple of releases in > > Debian between 6.12.41-1 and 6.12.73-1). So assume you have 6.12.69-1 > > which is good, and 6.12.73-1 which is not anymore, bisecting would > > involve: > > > > git clone --single-branch -b linux-6.12.y > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git > > cd linux-stable > > git checkout v6.12.69 > > cp /boot/config-$(uname -r) .config > > yes '' | make localmodconfig > > make savedefconfig > > mv defconfig arch/x86/configs/my_defconfig > > > > # test 6.12.69 to ensure this is "good" > > make my_defconfig > > make -j $(nproc) bindeb-pkg > > ... install the resulting .deb package and confirm problem does > > not exist > > > > # test 6.12.73 to ensure this is "bad" > > git checkout v6.12.73 > > make my_defconfig > > make -j $(nproc) bindeb-pkg > > ... install the resulting .deb package and confirm the problem > > exists. > > > > With that confirmed, the bisection can start: > > > > git bisect start > > git bisect good v6.12.69 > > git bisect bad v6.12.73 > > > > 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, 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. > > > > Regards, > > Salvatore > > I think I've installed and repeated the tests on all remaining kernels > based on apt-cache policy from 6.12.41 to 6.12.69 (6.12.48, 6.12.57 and > 6.12.63) > > Both 6.12.48 and 6.12.57 worked normally, like 6.12.41 did. > The problem appears on 6.12.63 onwards. Ok that is great, that reduces the search range. I update the metadata for the bug. > Tests consistent and repeatible, it's the kernel. > I'll do my best to try to perform the 'bisect'. Thank you, if you have issues in any of the steps, let us know please. Regards, Salvatore
