System Environment ======= kernel repo: drm-intel kernel commit: drm-tip: 2017y-06m-23d-09h-09m-45s Regression? ======= Yes drm-tip: 2017y-06m-20d-08h-32m-41s is good. drm-tip: 2017y-06m-23d-09h-09m-45s is bad. Bug detailed description ======= The guest boot up with the latest drm-intel 4.9.0-rc4+ kernel with kernel panic, but can boot up with the drm-intel 4.8.0-rc2+. This is KVM GVT-d environment issue. Reproduce Steps ============== Kernel boot up with default grub with no problem. Kernel boot up with i915.enable_ppgtt=1 (aliasing ppgtt) with Oops, it will not crash boot cannot start X well. Expected Result ============= Kernel boot up successfully. Actual Result =========== Guest boot up with Oops. Analysis & Root Cause =========== [ 11.076861] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 11.077162] Bluetooth: BNEP filters: protocol multicast [ 11.077469] Bluetooth: BNEP socket layer initialized [ 13.720934] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready [ 13.937653] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready [ 14.904595] BUG: unable to handle kernel NULL pointer dereference at (null) [ 14.905159] IP: gen8_ppgtt_insert_3lvl+0x88/0x1a0 [i915] [ 14.905452] PGD 0 [ 14.905452] P4D 0 [ 14.905768] Oops: 0000 [#1] SMP [ 14.905942] Modules linked in: bnep snd_soc_skl snd_soc_skl_ipc snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_hda_codec_hdmi intel_rapl snd_soc_sst_match snd_hda_codec_realtek snd_soc_core snd_hda_codec_generic snd_compress snd_pcm_dmaengine ac97_bus x86_pkg_temp_thermal intel_powerclamp coretemp 8250_dw snd_hda_intel kvm_intel snd_hda_codec snd_hda_core crct10dif_pclmul input_leds crc32_pclmul snd_hwdep ghash_clmulni_intel pcbc snd_pcm aesni_intel hci_uart btusb iwlwifi snd_seq ir_lirc_codec aes_x86_64 btrtl btqca ir_rc6_decoder lirc_dev btbcm btintel bluetooth rc_rc6_mce crypto_simd glue_helper ecdh_generic cryptd ite_cir snd_seq_device rc_core snd_timer cfg80211 snd soundcore idma64 virt_dma mac_hid mei_me mei shpchp intel_lpss_pci intel_lpss_acpi intel_lpss acpi_pad acpi_als intel_pch_thermal [ 14.909690] kfifo_buf industrialio parport_pc ppdev lp parport autofs4 kvmgt vfio_mdev mdev vfio_iommu_type1 vfio kvm irqbypass hid_generic usbhid i915 i2c_algo_bit drm_kms_helper ahci syscopyarea e1000e sysfillrect sysimgblt sdhci_pci fb_sys_fops ptp pps_core sdhci libahci drm video pinctrl_sunrisepoint i2c_hid pinctrl_intel hid [ 14.911245] CPU: 3 PID: 903 Comm: Xorg Tainted: G U 4.12.0-rc7+ #1 [ 14.911634] Hardware name: /NUC6i5SYB, BIOS SYSKLi35.86A.0042.2016.0409.1246 04/09/2016 [ 14.912137] task: ffff95bf00ec3c00 task.stack: ffffb0bb4260c000 [ 14.912472] RIP: 0010:gen8_ppgtt_insert_3lvl+0x88/0x1a0 [i915] [ 14.912790] RSP: 0018:ffffb0bb4260fa10 EFLAGS: 00010293 [ 14.913072] RAX: 0000000482c09000 RBX: ffff95bf01fd4dc0 RCX: 0000000000000004 [ 14.913453] RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000482c0a000 [ 14.913834] RBP: ffffb0bb4260fa30 R08: 0000000000000000 R09: 0000000000000083 [ 14.914214] R10: 0000000000000001 R11: 0000000000000004 R12: 0000000000000000 [ 14.914595] R13: ffff95befc7db7b0 R14: ffff95beff04ea80 R15: 0000000000000001 [ 14.914976] FS: 00007f508a859a00(0000) GS:ffff95bf16d80000(0000) knlGS:0000000000000000 [ 14.915408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 14.915715] CR2: 0000000000000000 CR3: 0000000482104000 CR4: 00000000003406e0 [ 14.916098] Call Trace: [ 14.916251] aliasing_gtt_bind_vma+0xeb/0x150 [i915] [ 14.916541] i915_vma_bind+0x63/0xc0 [i915] [ 14.916790] __i915_vma_do_pin+0x2d6/0x3b0 [i915] [ 14.917064] eb_lookup_vmas+0x457/0x7e0 [i915] [ 14.917313] ? __pm_runtime_resume+0x5b/0x80 [ 14.917560] i915_gem_do_execbuffer+0x4ad/0xec0 [i915] [ 14.917844] ? shmem_write_end+0x4b/0x240 [ 14.918063] ? pagecache_write_end+0x13/0x20 [ 14.918310] ? i915_gem_object_pwrite_gtt+0xc9/0x150 [i915] [ 14.918616] ? __kmalloc_node+0x1ef/0x2a0 [ 14.918848] i915_gem_execbuffer2+0xa0/0x1b0 [i915] [ 14.919139] drm_ioctl+0x201/0x490 [drm] [ 14.919372] ? i915_gem_execbuffer+0x2b0/0x2b0 [i915] [ 14.919651] do_vfs_ioctl+0xa1/0x5d0 [ 14.919848] ? handle_mm_fault+0xf3/0x210 [ 14.920068] ? __do_page_fault+0x265/0x4e0 [ 14.920290] SyS_ioctl+0x79/0x90 [ 14.920470] entry_SYSCALL_64_fastpath+0x1e/0xa9 [ 14.920720] RIP: 0033:0x7f50886b5357 [ 14.920916] RSP: 002b:00007ffd01bd6bc8 EFLAGS: 00003246 ORIG_RAX: 0000000000000010 [ 14.921320] RAX: ffffffffffffffda RBX: 00007f508a7c0460 RCX: 00007f50886b5357 [ 14.921702] RDX: 00007ffd01bd6c70 RSI: 0000000040406469 RDI: 000000000000000a [ 14.922083] RBP: 00000000fffffe00 R08: 00007ffd01bd6cc0 R09: 0000000000000001 [ 14.922464] R10: 00007f508897d2c8 R11: 0000000000003246 R12: 00000000ffff8001 [ 14.922846] R13: 000055e204fae410 R14: 00007f508a7c0000 R15: 00007f508a7c0004 [ 14.923226] Code: 89 f4 41 89 cb 48 01 c7 45 85 d2 74 14 41 83 fa 03 41 b8 83 00 00 00 41 b9 13 00 00 00 4d 0f 45 c8 4d 8b 85 48 05 00 00 48 63 c9 <49> 8b 1c f0 48 8b 4c cb 10 4c 8b 01 65 4c 8b 14 25 40 d4 00 00 [ 14.924256] RIP: gen8_ppgtt_insert_3lvl+0x88/0x1a0 [i915] RSP: ffffb0bb4260fa10 [ 14.924651] CR2: 0000000000000000 [ 14.930894] ---[ end trace b1c744137a0a5140 ]---
Created attachment 132489 [details] dmesg.log Attach the dmesg log.
commit 17369ba08c065967b7b8c48253f20b73acc0b9f5 Author: Chuanxiao Dong <chuanxiao.dong@intel.com> Date: Fri Jul 7 17:50:59 2017 +0800 drm/i915: Fix the kernel panic when using aliasing ppgtt The ppgtt should be get directly from i915_address_space *vm instead of vma->vm. v2: - add one more fix for bxt. (Chris) Fixes: 4a234c5fae16 ("drm/i915: pass the vma to insert_entries") Bugzilla:https://bugs.freedesktop.org/show_bug.cgi?id=101713 Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
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