Public bug reported: [Impact] Shows follow_pte() warning with nvidia dirver + 6.11 kernel.
Aug 09 09:20:42 ubuntu-202407-34200 kernel: WARNING: CPU: 0 PID: 2918 at include/linux/rwsem.h:80 follow_pte+0x220/0x230 [Fix] This occurs during suspend when a function from the NVIDIA 'nv_revoke_gpu_mappings_locked()' calls the kernel function 'unmap_mapping_range()', which eventually ends up calling 'follow_pte()'. The function 'follow_pte()' calls an assertion 'mmap_assert_locked' to check if the 'mmap_lock' has been taken. This assertion fails, and we see a warning call trace (no functional issue, just some output in dmesg). All of this happens in kernel versions v6.10 through v6.11. This is a kernel bug, not an NVIDIA driver bug, and has also been discussed here in the kernel mailing list : https://lore.kernel.org/linux-mm/[email protected]/T/#u There is a series of patches to address this issue and replace the follow_pte() https://lore.kernel.org/linux-mm/[email protected]/ We try to cherry pick the new functions and at the same time preserve the follow_pte() for compatiblity with the old drivers. b1b46751671b mm: fix follow_pfnmap API lockdep assert 75182022a043 mm/x86: support large pfn mappings cbea8536d933 mm/x86/pat: use the new follow_pfnmap API 6da8e9634bb7 mm: new follow_pfnmap API 6857be5fecae mm: introduce ARCH_SUPPORTS_HUGE_PFNMAP and special bits to pmd/pud [Test] 1. Boot up the machine with 6.11 kernel + nvidia driver 2. Do suspend/resume and check dmesg 3. There should be no nvidia call trace [Where problems could occur] Only this patch change the code that uses follow_pfnmap() to replace follow_pfn() cbea8536d933 ("mm/x86/pat: use the new follow_pfnmap API") The changes are 1x1 mappingable and should do the identical things. ** Affects: hwe-next Importance: Undecided Status: New ** Affects: linux-oem-6.11 (Ubuntu) Importance: Undecided Status: Invalid ** Affects: linux-oem-6.11 (Ubuntu Noble) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Tags: jira-somerville-371 jira-stella-147 oem-priority ** Also affects: linux-oem-6.11 (Ubuntu Noble) Importance: Undecided Status: New ** Changed in: linux-oem-6.11 (Ubuntu Noble) Status: New => In Progress ** Changed in: linux-oem-6.11 (Ubuntu Noble) Assignee: (unassigned) => AceLan Kao (acelankao) ** Changed in: linux-oem-6.11 (Ubuntu) Status: New => Invalid ** Tags added: jira-stella-147 oem-priority ** Tags added: jira-somerville-371 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2086668 Title: NVIDIA WANR_ON call trace right after power on or resumed on 6.11 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2086668/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
