Hello. Since v6.5 kernel the following HW: * Lenovo T460s laptop with Skylake GT2 [HD Graphics 520] (rev 07) * Lenovo T490s laptop with WhiskeyLake-U GT2 [UHD Graphics 620] (rev 02) is affected by the following crash once KDE on either X11 or Wayland is started: i915 0000:00:02.0: enabling device (0006 -> 0007) i915 0000:00:02.0: vgaarb: deactivate vga console i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=mem i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/skl_dmc_ver1_27.bin (v1.27) [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 1 fbcon: i915drmfb (fb0) is primary device i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device … memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=674 'kwin_wayland' BUG: unable to handle page fault for address: ffffb422c2800000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 100000067 P4D 100000067 PUD 1001df067 PMD 10d1cf067 PTE 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 1 PID: 674 Comm: kwin_wayland Not tainted 6.5.0-pf1 #1 a6c58ff41a7b8bb16a19f5af9e0e9bce20f9f38d Hardware name: LENOVO 20FAS2BM0F/20FAS2BM0F, BIOS N1CET90W (1.58 ) 11/15/2022 RIP: 0010:gen8_ggtt_insert_entries+0xc2/0x140 [i915] … Call Trace: <TASK> intel_ggtt_bind_vma+0x3e/0x60 [i915 a83fdc6539431252dba13053979a8b680af86836] i915_vma_bind+0x216/0x4b0 [i915 a83fdc6539431252dba13053979a8b680af86836] i915_vma_pin_ww+0x405/0xa80 [i915 a83fdc6539431252dba13053979a8b680af86836] __i915_ggtt_pin+0x5a/0x130 [i915 a83fdc6539431252dba13053979a8b680af86836] i915_ggtt_pin+0x78/0x1f0 [i915 a83fdc6539431252dba13053979a8b680af86836] __intel_context_do_pin_ww+0x312/0x700 [i915 a83fdc6539431252dba13053979a8b680af86836] i915_gem_do_execbuffer+0xfc6/0x2720 [i915 a83fdc6539431252dba13053979a8b680af86836] i915_gem_execbuffer2_ioctl+0x111/0x260 [i915 a83fdc6539431252dba13053979a8b680af86836] drm_ioctl_kernel+0xca/0x170 drm_ioctl+0x30f/0x580 __x64_sys_ioctl+0x94/0xd0 do_syscall_64+0x5d/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 … note: kwin_wayland[674] exited with irqs disabled RIP seems to translate into this: $ scripts/faddr2line drivers/gpu/drm/i915/gt/intel_ggtt.o gen8_ggtt_insert_entries+0xc2 gen8_ggtt_insert_entries+0xc2/0x150: writeq at /home/pf/work/devel/own/pf-kernel/linux/./arch/x86/include/asm/io.h:99 (inlined by) gen8_set_pte at /home/pf/work/devel/own/pf-kernel/linux/drivers/gpu/drm/i915/gt/intel_ggtt.c:257 (inlined by) gen8_ggtt_insert_entries at /home/pf/work/devel/own/pf-kernel/linux/drivers/gpu/drm/i915/gt/intel_ggtt.c:300 Probably, recent PTE-related changes are relevant: $ git log --oneline --no-merges v6.4..v6.5 -- drivers/gpu/drm/i915/gt/intel_ggtt.c 3532e75dfadcf drm/i915/uc: perma-pin firmwares 4722e2ebe6f21 drm/i915/gt: Fix second parameter type of pre-gen8 pte_encode callbacks 9275277d53248 drm/i915: use pat_index instead of cache_level 5e352e32aec23 drm/i915: preparation for using PAT index 341ad0e8e2542 drm/i915/mtl: Add PTE encode function Also note Lenovo T14s laptop with TigerLake-LP GT2 [Iris Xe Graphics] (rev 01) is not affected by this issue. Full dmesg with DRM debug enabled is available in the bugreport I've reported earlier [1]. I'm sending this email to make the issue more visible. Please help. Thanks. [1] https://gitlab.freedesktop.org/drm/intel/-/issues/9256 -- Oleksandr Natalenko (post-factum)
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