How do we fix this?

On Tue, Jun 18, 2024 at 9:40 AM Acru <email address hidden> wrote:

> Hey,
> After disabling the kernel update via the update manager, it now got
> installed again, again resulting in a not working system.
> Isn't it possible to just completely remove this one version from the repo?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2068738
>
> Title:
>   AMD GPUs fail with null pointer dereference when IOMMU enabled,
>   leading to black screen
>
> Status in linux package in Ubuntu:
>   Fix Released
> Status in linux source package in Jammy:
>   Fix Committed
>
> Bug description:
>   BugLink: https://bugs.launchpad.net/bugs/2068738
>
>   [Impact]
>
>   On systems with AMD Picasso/Raven 2 GPU devices, when the IOMMU is
>   enabled, the system fails to boot correctly, and all users see is a
>   black screen.
>
>   This is caused by a null pointer dereference when enabling the IOMMU
>   after the device has been initialised. It should happen the other way
>   around.
>
>   AMD-Vi: AMD IOMMUv2 loaded and initialized
>   ...
>   amdgpu: Topology: Add APU node [0x15d8:0x1002]
>   kfd kfd: amdgpu: added device 1002:15d8
>   kfd kfd: amdgpu: Failed to resume IOMMU for device 1002:15d8
>   ...
>   amdgpu 0000:06:00.0: amdgpu: amdgpu_device_ip_init failed
>   amdgpu 0000:06:00.0: amdgpu: Fatal error during GPU init
>   amdgpu 0000:06:00.0: amdgpu: amdgpu: finishing device.
>   ...
>   BUG: kernel NULL pointer dereference, address: 000000000000013c
>   ...
>   CPU: 1 PID: 223 Comm: systemd-udevd Not tainted 5.15.0-112-generic
> #122-Ubuntu
>   ...
>   RIP: 0010:amdgpu_dm_fini+0x149/0x1f0 [amdgpu]
>   ...
>   Call Trace:
>    <TASK>
>    ? srso_return_thunk+0x5/0x10
>    ? show_trace_log_lvl+0x28e/0x2ea
>    ? show_trace_log_lvl+0x28e/0x2ea
>    ? dm_hw_fini+0x23/0x30 [amdgpu]
>    ? show_regs.part.0+0x23/0x29
>    ? __die_body.cold+0x8/0xd
>    ? __die+0x2b/0x37
>    ? page_fault_oops+0x13b/0x170
>    ? srso_return_thunk+0x5/0x10
>    ? do_user_addr_fault+0x321/0x670
>    ? srso_return_thunk+0x5/0x10
>    ? __free_pages_ok+0x34a/0x4f0
>    ? exc_page_fault+0x77/0x170
>    ? asm_exc_page_fault+0x27/0x30
>    ? amdgpu_dm_fini+0x149/0x1f0 [amdgpu]
>    dm_hw_fini+0x23/0x30 [amdgpu]
>    amdgpu_device_ip_fini_early.isra.0+0x278/0x312 [amdgpu]
>    amdgpu_device_fini_hw+0x156/0x208 [amdgpu]
>    amdgpu_driver_unload_kms+0x69/0x90 [amdgpu]
>    amdgpu_driver_load_kms.cold+0x81/0x107 [amdgpu]
>    amdgpu_pci_probe+0x1d1/0x290 [amdgpu]
>    local_pci_probe+0x4b/0x90
>    ? srso_return_thunk+0x5/0x10
>    pci_device_probe+0x119/0x200
>    really_probe+0x222/0x420
>    __driver_probe_device+0xe8/0x140
>    driver_probe_device+0x23/0xc0
>    __driver_attach+0xf7/0x1f0
>    ? __device_attach_driver+0x140/0x140
>    bus_for_each_dev+0x7f/0xd0
>    driver_attach+0x1e/0x30
>    bus_add_driver+0x148/0x220
>    ? srso_return_thunk+0x5/0x10
>    driver_register+0x95/0x100
>    __pci_register_driver+0x68/0x70
>    amdgpu_init+0x7c/0x1000 [amdgpu]
>    ? 0xffffffffc0e0b000
>    do_one_initcall+0x49/0x1e0
>    ? srso_return_thunk+0x5/0x10
>    ? kmem_cache_alloc_trace+0x19e/0x2e0
>    do_init_module+0x52/0x260
>    load_module+0xb45/0xbe0
>    __do_sys_finit_module+0xbf/0x120
>    __x64_sys_finit_module+0x18/0x20
>    x64_sys_call+0x1ac3/0x1fa0
>    do_syscall_64+0x56/0xb0
>   ...
>    entry_SYSCALL_64_after_hwframe+0x67/0xd1
>
>   A workaround does exist. Users can set "nomodeset" or "amd_iommu=off"
>   to GRUB_CMDLINE_LINUX_DEFAULT, update-grub and reboot.
>
>   [Fix]
>
>   The regression was caused by the following commit that landed in
>   5.15.0-112-generic, and 5.15.150 upstream:
>
>   commit 3c7e53c0d4b43ffe6e7715414b5f2b3177881ecd ubuntu-jammy
>   Author: Yifan Zhang <email address hidden>
>   Date: Tue Sep 28 15:42:35 2021 +0800
>   Subject: drm/amdgpu: init iommu after amdkfd device init
>   Link:
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/commit/?id=3c7e53c0d4b43ffe6e7715414b5f2b3177881ecd
>
>   The fix is to revert this patch, as it was not suppose to be
>   backported to 5.15 stable.
>
>   The mailing list discussion with AMD developers is:
>
>   https://<email address hidden>/
>
>   The fix hasn't been acknowledged by Greg KH or Sasha Levin yet, so
>   sending as a Ubuntu SAUCE patch. If the upstream status changes, we
>   can NAK and resend.
>
>   [Testcase]
>
>   You need a system with an AMD Picasso/Raven 2 device. It will likely
>   be an APU, and not a discrete graphics card, but any AMD Picasso/Raven
>   2 device is affected.
>
>   Install the kernel and boot. Make sure full modesetting is enabled.
>
>   There is a test kernel available in the ppa below:
>
>   https://launchpad.net/~mruffell/+archive/ubuntu/lp2068738-test
>
>   If you install the test kernel, your system should boot successfully.
>
>   [Where problems could occur]
>
>   We are reverting a problematic patch and going back to how it was
>   before 5.15.0-112-generic. This should not cause any issues for users.
>
>   If a regression were to occur, users can set "nomodeset" or
>   "amd_iommu=off" to GRUB_CMDLINE_LINUX_DEFAULT and reboot, or pin their
>   kernel to a working one.
>
>   The impact of a regression would be high, as users displays could be
>   blank.
>
>   [Other Info]
>
>   User reports:
>   https://forums.linuxmint.com/viewtopic.php?t=421484
>   https://forums.linuxmint.com/viewtopic.php?t=421441
>
> https://www.reddit.com/r/Ubuntu/comments/1d9uviz/had_to_purge_kernel_5150112_could_not_boot/
>
> https://www.reddit.com/r/linuxmint/comments/1d9w6c9/kernel_5150112_boot_failure/
>   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2068735
>   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2068793
>   https://bugs.launchpad.net/bugs/2068812
>
>   As bizarre as it is, this commit was actually originally included in
>   5.15-rc5:
>
>   commit 714d9e4574d54596973ee3b0624ee4a16264d700
>   Author: Yifan Zhang <email address hidden>
>   Date: Tue Sep 28 15:42:35 2021 +0800
>   Subject: drm/amdgpu: init iommu after amdkfd device init
>   Link:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=714d9e4574d54596973ee3b0624ee4a16264d700
>
>   It seems to have caused issues back then too, and was removed in the
>   following fixups, in 5.16-rc1:
>
>   commit 93cec184788b0cf3926bc1f7b47fed74ba87990c
>   Author: James Zhu <email address hidden>
>   Date:   Tue Nov 2 21:33:50 2021 -0400
>   Subject: drm/amdgpu: remove duplicated kfd_resume_iommu
>   Link:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93cec184788b0cf3926bc1f7b47fed74ba87990c
>
>   commit 9f4f2c1a35248f56b2a9c1c004e0aaff3609b15d
>   Author: shaoyunl <email address hidden>
>   Date:   Fri Nov 5 12:34:14 2021 -0400
>   Subject: drm/amd/amdgpu: fix the kfd pre_reset sequence in sriov
>   Link:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f4f2c1a35248f56b2a9c1c004e0aaff3609b15d
>
>   I'm not exactly in favor of rewriting history twice, so I think we
>   should just revert the upstream stable patch and move on.
>
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>
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