Jul 30 09:37:33 yurix kernel: [   20.968954] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
Jul 30 09:37:33 yurix kernel: [   21.211379] [drm] ring test on 0 succeeded in 15 usecs
Jul 30 09:37:33 yurix kernel: [   21.211590] [drm] ring test on 1 succeeded in 16 usecs
Jul 30 09:37:33 yurix kernel: [   21.211623] [drm] ring test on 2 succeeded in 15 usecs
Jul 30 09:37:33 yurix kernel: [   21.211633] [drm] ring test on 3 succeeded in 4 usecs
Jul 30 09:37:33 yurix kernel: [   21.211641] [drm] ring test on 4 succeeded in 3 usecs
Jul 30 09:37:33 yurix kernel: [   21.211647] [drm] ring test on 5 succeeded in 2 usecs
Jul 30 09:37:33 yurix kernel: [   21.211653] [drm] ring test on 6 succeeded in 2 usecs
Jul 30 09:37:33 yurix kernel: [   21.211661] [drm] ring test on 7 succeeded in 3 usecs
Jul 30 09:37:33 yurix kernel: [   21.211667] [drm] ring test on 8 succeeded in 2 usecs
Jul 30 09:37:33 yurix kernel: [   21.211694] [drm] ring test on 9 succeeded in 6 usecs
Jul 30 09:37:33 yurix kernel: [   21.211707] [drm] ring test on 10 succeeded in 6 usecs
Jul 30 09:37:34 yurix acpid: client 3138[0:0] has disconnected
Jul 30 09:37:34 yurix acpid: client connected from 3961[0:0]
Jul 30 09:37:34 yurix acpid: 1 client rule loaded
Jul 30 09:37:34 yurix kernel: [   21.394746] BUG: unable to handle kernel NULL pointer dereference at 0000000000000248
Jul 30 09:37:34 yurix kernel: [   21.394772] IP: [<ffffffffc01e5f22>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.394805] PGD 0 
Jul 30 09:37:34 yurix kernel: [   21.394812] Oops: 0000 [#1] SMP 
Jul 30 09:37:34 yurix kernel: [   21.394823] Modules linked in: drbg ansi_cprng ctr ccm bnep rtsx_usb_sdmmc rtsx_usb_ms memstick btusb btrtl btbcm btintel bluetooth hid_generic cypress_m8 usbserial rtsx_usb binfmt_misc nls_iso8859_1 arc4 joydev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp iwlmvm hid_multitouch snd_hda_codec_hdmi kvm_intel mac80211 kvm dell_wmi sparse_keymap dell_laptop irqbypass dcdbas dell_smm_hwmon crct10dif_pclmul crc32_pclmul iwlwifi cfg80211 dell_led aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_realtek cryptd snd_hda_codec_generic input_leds snd_soc_rt5640 serio_raw snd_soc_rl6231 snd_soc_ssm4567 snd_hda_intel snd_soc_core snd_hda_codec lpc_ich snd_seq_midi snd_hda_core snd_compress snd_seq_midi_event mei_me snd_hwdep ac97_bus mei snd_pcm_dmaengine snd_rawmidi shpchp snd_seq elan_i2c snd_seq_device snd_pcm snd_timer snd soundcore uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 dw_dmac videobuf2_core snd_soc_sst_acpi dw_dmac_core v4l2_common 8250_dw i2c_designware_platform dell_rbtn videodev i2c_designware_core spi_pxa2xx_platform acpi_pad mac_hid media ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_multiport xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables parport_pc ppdev x_tables lp parport autofs4 usbhid amdkfd amd_iommu_v2 i915 amdgpu psmouse ttm ahci i2c_algo_bit libahci drm_kms_helper syscopyarea r8169 sysfillrect sysimgblt mii fb_sys_fops drm wmi i2c_hid sdhci_acpi hid sdhci video fjes
Jul 30 09:37:34 yurix kernel: [   21.395353] CPU: 3 PID: 514 Comm: gfx Not tainted 4.4.0-31-generic #50-Ubuntu
Jul 30 09:37:34 yurix kernel: [   21.395371] Hardware name: Dell Inc. Inspiron 5548/0YDTG3, BIOS A06 10/12/2015
Jul 30 09:37:34 yurix kernel: [   21.395389] task: ffff88003f986e00 ti: ffff880444878000 task.ti: ffff880444878000
Jul 30 09:37:34 yurix kernel: [   21.395407] RIP: 0010:[<ffffffffc01e5f22>]  [<ffffffffc01e5f22>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.395442] RSP: 0018:ffff88044487bce0  EFLAGS: 00010246
Jul 30 09:37:34 yurix kernel: [   21.395455] RAX: 0000000000000000 RBX: ffff8804455d8000 RCX: ffff880448261400
Jul 30 09:37:34 yurix kernel: [   21.395473] RDX: 0000000000000000 RSI: ffff8804455dadc0 RDI: ffff880443c7e600
Jul 30 09:37:34 yurix kernel: [   21.395490] RBP: ffff88044487bdb0 R08: ffff880448261400 R09: 0000000000000000
Jul 30 09:37:34 yurix kernel: [   21.395508] R10: 00000000fffeefeb R11: 00000000000008bc R12: ffff8804455dadc0
Jul 30 09:37:34 yurix kernel: [   21.395525] R13: ffff880443c7e600 R14: ffff8804455d8838 R15: 0000000000000001
Jul 30 09:37:34 yurix kernel: [   21.395543] FS:  0000000000000000(0000) GS:ffff88045ecc0000(0000) knlGS:0000000000000000
Jul 30 09:37:34 yurix kernel: [   21.395563] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 30 09:37:34 yurix kernel: [   21.395577] CR2: 0000000000000248 CR3: 0000000001e0a000 CR4: 00000000003406e0
Jul 30 09:37:34 yurix kernel: [   21.395595] Stack:
Jul 30 09:37:34 yurix kernel: [   21.395601]  ffff88003f646c48 0000000000000000 ffff880448261400 0000000000000000
Jul 30 09:37:34 yurix kernel: [   21.395622]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
Jul 30 09:37:34 yurix kernel: [   21.395644]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
Jul 30 09:37:34 yurix kernel: [   21.395665] Call Trace:
Jul 30 09:37:34 yurix kernel: [   21.395683]  [<ffffffffc01e7d60>] amdgpu_ib_schedule+0x90/0x390 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.395713]  [<ffffffffc0224506>] amdgpu_sched_run_job+0x36/0x140 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.395742]  [<ffffffffc0223d1f>] amd_sched_main+0x23f/0x400 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.395760]  [<ffffffff810c3ca0>] ? wake_atomic_t_function+0x60/0x60
Jul 30 09:37:34 yurix kernel: [   21.395788]  [<ffffffffc0223ae0>] ? amd_sched_entity_wakeup+0x70/0x70 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.395807]  [<ffffffff810a0808>] kthread+0xd8/0xf0
Jul 30 09:37:34 yurix kernel: [   21.395820]  [<ffffffff810a0730>] ? kthread_create_on_node+0x1e0/0x1e0
Jul 30 09:37:34 yurix kernel: [   21.395838]  [<ffffffff8182decf>] ret_from_fork+0x3f/0x70
Jul 30 09:37:34 yurix kernel: [   21.395857]  [<ffffffff810a0730>] ? kthread_create_on_node+0x1e0/0x1e0
Jul 30 09:37:34 yurix kernel: [   21.395875] Code: c0 44 89 bc 85 48 ff ff ff 41 83 c7 01 44 39 bb 1c 09 00 00 76 4f 49 83 c6 10 4d 8b 6e f0 4d 85 ed 74 66 4c 89 ef e8 de 2e ff ff <8b> b8 48 02 00 00 48 8b b4 fd 50 ff ff ff 48 85 f6 74 b2 41 8b 
Jul 30 09:37:34 yurix kernel: [   21.395978] RIP  [<ffffffffc01e5f22>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
Jul 30 09:37:34 yurix kernel: [   21.396007]  RSP <ffff88044487bce0>
Jul 30 09:37:34 yurix kernel: [   21.396016] CR2: 0000000000000248
Jul 30 09:37:34 yurix kernel: [   21.402263] ---[ end trace 0cfcccb3fc2aeec8 ]---