On Tue, Oct 24, 2023 at 11:09:10PM +0200, Salvatore Bonaccorso wrote: > Hi Timo, > > On Tue, Oct 24, 2023 at 11:14:32PM +0300, Timo Lindfors wrote: > > Package: src:linux > > Version: 6.1.55-1 > > Severity: normal > > > > Steps to reproduce: > > 1) Install Debian 12 as a virtual machine using virt-manager, choose qxl > > graphics card. You only need basic installation without wayland or X. > > 2) Login from the console and save thë following to reproduce.bash: > > > > #!/bin/bash > > > > chvt 3 > > for j in $(seq 80); do > > echo "$(date) starting round $j" > > if [ "$(journalctl --boot | grep "failed to allocate VRAM BO")" != "" ]; > > then > > echo "bug was reproduced after $j tries" > > exit 1 > > fi > > for i in $(seq 100); do > > dmesg > /dev/tty3 > > done > > done > > > > echo "bug could not be reproduced" > > exit 0 > > > > > > 3) Run chmod a+x reproduce.bash > > 4) Run ./reproduce.bash and wait for up to 20 minutes. > > > > Expected results: > > 4) The system prints a steady flow of text without kernel error messages > > > > Actual messages: > > 4) At some point the text stops flowing and the script prints "bug was > > reproduced". If you run "journalctl --boot" you see > > > > kernel: [TTM] Buffer eviction failed > > kernel: qxl 0000:00:02.0: object_init failed for (3149824, 0x00000001) > > kernel: [drm:qxl_alloc_bo_reserved [qxl]] *ERROR* failed to allocate VRAM BO > > > > > > > > More info: > > 1) The bug does not occur if I downgrade the kernel to > > linux-image-5.10.0-26-amd64_5.10.197-1_amd64.deb from Debian 11. > > 2) I used the following test_linux.bash to bisect this issue against > > upstream source: > > > > #!/bin/bash > > set -x > > > > gitversion="$(git describe HEAD|sed 's@^v@@')" > > > > git checkout drivers/gpu/drm/ttm/ttm_bo.c include/drm/ttm/ttm_bo_api.h > > git show bec771b5e0901f4b0bc861bcb58056de5151ae3a | patch -p1 > > # Build > > cp ~/kernel.config .config > > # cp /boot/config-$(uname -r) .config > > # scripts/config --enable LOCALVERSION_AUTO > > # scripts/config --disable DEBUG_INFO > > # scripts/config --disable SYSTEM_TRUSTED_KEYRING > > # scripts/config --set-str SYSTEM_TRUSTED_KEYS '' > > # scripts/config --disable STACKPROTECTOR_STRONG > > make olddefconfig > > # make localmodconfig > > make -j$(nproc --all) bindeb-pkg > > rc="$?" > > if [ "$rc" != "0" ]; then > > exit 125 > > fi > > git checkout drivers/gpu/drm/ttm/ttm_bo.c include/drm/ttm/ttm_bo_api.h > > > > package="$(ls --sort=time ../linux-image-*_amd64.deb|head -n1)" > > version=$(echo $package | cut -d_ -f1|cut -d- -f3-) > > > > if [ "$gitversion" != "$version" ]; then > > echo "Build produced version $gitversion but got $version, ignoring" > > #exit 255 > > fi > > > > # Deploy > > scp $package target:a.deb > > ssh target sudo apt install ./a.deb > > ssh target rm -f a.deb > > ssh target ./grub_set_default_version.bash $version > > ssh target sudo shutdown -r now > > sleep 40 > > > > detected_version=$(ssh target uname -r) > > if [ "$detected_version" != "$version" ]; then > > echo "Booted to $detected_version but expected $version" > > exit 255 > > fi > > > > # Test > > exec ssh target sudo ./reproduce.bash > > > > > > Bisect printed the following log: > > > > git bisect start > > # bad: [ed29c2691188cf7ea2a46d40b891836c2bd1a4f5] drm/i915: Fix userptr so we do not have to worry about obj->mm.lock, v7. > > git bisect bad ed29c2691188cf7ea2a46d40b891836c2bd1a4f5 > > # bad: [762949bb1da78941b25e63f7e952af037eee15a9] drm: fix drm_mode_create_blob comment > > git bisect bad 762949bb1da78941b25e63f7e952af037eee15a9 > > # bad: [e40f97ef12772f8eb04b6a155baa1e0e2e8f3ecc] drm/gma500: Drop DRM_GMA600 config option > > git bisect bad e40f97ef12772f8eb04b6a155baa1e0e2e8f3ecc > > # bad: [5a838e5d5825c85556011478abde708251cc0776] drm/qxl: simplify qxl_fence_wait > > git bisect bad 5a838e5d5825c85556011478abde708251cc0776 > > # bad: [d2b6f8a179194de0ffc4886ffc2c4358d86047b8] Merge tag 'xfs-5.13-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux > > git bisect bad d2b6f8a179194de0ffc4886ffc2c4358d86047b8 > > # bad: [68a32ba14177d4a21c4a9a941cf1d7aea86d436f] Merge tag 'drm-next-2021-04-28' of git://anongit.freedesktop.org/drm/drm > > git bisect bad 68a32ba14177d4a21c4a9a941cf1d7aea86d436f > > # bad: [0698b13403788a646073fcd9b2294f2dce0ce429] drm/amdgpu: skip PP_MP1_STATE_UNLOAD on aldebaran > > git bisect bad 0698b13403788a646073fcd9b2294f2dce0ce429 > > # bad: [e1a5e6a8c48bf99ea374fb3e535661cfe226bca4] drm/doc: Add RFC section > > git bisect bad e1a5e6a8c48bf99ea374fb3e535661cfe226bca4 > > # bad: [ed29c2691188cf7ea2a46d40b891836c2bd1a4f5] drm/i915: Fix userptr so we do not have to worry about obj->mm.lock, v7. > > git bisect bad ed29c2691188cf7ea2a46d40b891836c2bd1a4f5 > > # bad: [2c8ab3339e398bbbcb0980933e266b93bedaae52] drm/i915: Pin timeline map after first timeline pin, v4. > > git bisect bad 2c8ab3339e398bbbcb0980933e266b93bedaae52 > > # bad: [2eb8e1a69d9f8cc9c0a75e327f854957224ba421] drm/i915/gem: Drop relocation support on all new hardware (v6) > > git bisect bad 2eb8e1a69d9f8cc9c0a75e327f854957224ba421 > > # bad: [b5b6f6a610127b17f20c0ca03dd27beee4ddc2b2] drm/i915/gem: Drop legacy execbuffer support (v2) > > git bisect bad b5b6f6a610127b17f20c0ca03dd27beee4ddc2b2 > > # bad: [06debd6e1b28029e6e77c41e59a162868f377897] Merge tag 'drm-intel-next-2021-03-16' of git://anongit.freedesktop.org/drm/drm-intel into drm-next > > git bisect bad 06debd6e1b28029e6e77c41e59a162868f377897 > > # good: [e19eede54240d64b4baf9b0df4dfb8191f7ae48b] Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging > > git bisect good e19eede54240d64b4baf9b0df4dfb8191f7ae48b > > # good: [1e28eed17697bcf343c6743f0028cc3b5dd88bf0] Linux 5.12-rc3 > > git bisect good 1e28eed17697bcf343c6743f0028cc3b5dd88bf0 > > # bad: [6af70eb3b40edfc8bdf2373cdc2bcf9d5a20c8c7] drm/atmel-hlcdc: Rename custom plane state variable > > git bisect bad 6af70eb3b40edfc8bdf2373cdc2bcf9d5a20c8c7 > > # good: [4ca77c513537700d3fae69030879f781dde1904c] drm/qxl: release shadow on shutdown > > git bisect good 4ca77c513537700d3fae69030879f781dde1904c > > # bad: [4a11bd1e88af130f50a72e0f54391c1c7d268e03] drm/ast: Add constants for VGACRCB register bits > > git bisect bad 4a11bd1e88af130f50a72e0f54391c1c7d268e03 > > # bad: [5c209d8056b9763ce544ecd7dadb3782cdaf96ed] drm/gma500: psb_spank() doesn't need it's own file > > git bisect bad 5c209d8056b9763ce544ecd7dadb3782cdaf96ed > > # bad: [db0c6bd2c0c0dada8927cd46a7c34c316a3a6c04] drm/gem: Export drm_gem_vmap() and drm_gem_vunmap() > > git bisect bad db0c6bd2c0c0dada8927cd46a7c34c316a3a6c04 > > # bad: [f4a84e165e6d58606097dd07b5b78767a94b870c] drm/qxl: allocate dumb buffers in ram > > git bisect bad f4a84e165e6d58606097dd07b5b78767a94b870c > > # good: [a7709b9b89a67f3ead2d188b1d0c261059b1f291] drm/qxl: handle shadow in primary destroy > > git bisect good a7709b9b89a67f3ead2d188b1d0c261059b1f291 > > # bad: [5a838e5d5825c85556011478abde708251cc0776] drm/qxl: simplify qxl_fence_wait > > git bisect bad 5a838e5d5825c85556011478abde708251cc0776 > > # good: [5f6c871fe919999774e8535ea611a6f84ee43ee4] drm/qxl: properly free qxl releases > > git bisect good 5f6c871fe919999774e8535ea611a6f84ee43ee4 > > # first bad commit: [5a838e5d5825c85556011478abde708251cc0776] drm/qxl: simplify qxl_fence_wait > > > > I took a look at > > > > commit 5a838e5d5825c85556011478abde708251cc0776 (refs/bisect/bad) > > Author: Gerd Hoffmann <kraxel@xxxxxxxxxx> > > Date: Thu Feb 4 15:57:10 2021 +0100 > > > > drm/qxl: simplify qxl_fence_wait > > > > Now that we have the new release_event wait queue we can just > > use that in qxl_fence_wait() and simplify the code a lot. > > > > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> > > Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx> > > Link: http://patchwork.freedesktop.org/patch/msgid/20210204145712.1531203-10-kraxel@xxxxxxxxxx > > > > > > and noticed that the bug does not occur if I boot 6.1 kernel with this patch > > reverted (see attached file). > > Thanks for the excelent constructed report! I think it's best to > forward this directly to upstream including the people for the > bisected commit to get some idea. > > Can you reproduce the issue with 6.5.8-1 in unstable as well? > > If not, are you able to isolate an upstream fix which should be > backported to the 6.1.y series as well? > Thanks for the regression report. I'm adding it to regzbot: #regzbot ^introduced: 5a838e5d5825c8 #regzbot title: simplifying qxl_fence_wait() makes VRAM BO allocation fail #regzbot from: Timo Lindfors <timo.lindfors@xxxxxx> -- An old man doll... just what I always wanted! - Clara
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