/cc Bagas as well (see below). On úterý 19. září 2023 10:26:42 CEST Oleksandr Natalenko wrote: > /cc Matthew Wilcox and Andrew Morton because of folios (please see below). > > On sobota 2. září 2023 18:14:12 CEST Oleksandr Natalenko wrote: > > 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 > > Matthew, > > Andrzej asked me to try to revert commits 0b62af28f249, e0b72c14d8dc and > 1e0877d58b1e, and reverting those fixed the i915 crash for me. The > e0b72c14d8dc and 1e0877d58b1e commits look like just prerequisites, so I > assume 0b62af28f249 ("i915: convert shmem_sg_free_table() to use a > folio_batch") is the culprit here. > > Could you please check this? > > Our conversation with Andrzej is available at drm-intel GitLab [1]. > > Thanks. > > [1] https://gitlab.freedesktop.org/drm/intel/-/issues/9256
Bagas, would you mind adding this to the regression tracker please? Thanks. -- Oleksandr Natalenko (post-factum)
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