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Date:   Fri, 24 Nov 2017 17:29:20 +0100
From:   Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
To:     Christian König <christian.koenig@....com>,
        Michel Dänzer <michel.daenzer@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Dave Airlie <airlied@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: Regression in TTM driver w/Linus' master


On 11/24/17 4:35 PM, Christian König wrote:
> Am 24.11.2017 um 16:17 schrieb Tobias Klausmann:
>>
>> On 11/24/17 3:54 PM, Daniel Vetter wrote:
>>> On Thu, Nov 23, 2017 at 03:24:38PM +0100, Tobias Klausmann wrote:
>>>> On 11/23/17 2:58 AM, Dave Airlie wrote:
>>>>> On 23 November 2017 at 11:17, Laura Abbott <labbott@...hat.com> 
>>>>> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> Fedora QA testing reported a panic when booting up VMs
>>>>>> using qmeu vga drivers
>>>>>> (https://paste.fedoraproject.org/paste/498yRWTCJv2LKIrmj4EliQ)
>>>>>>
>>>>>> [   30.108507] ------------[ cut here ]------------
>>>>>> [   30.108920] kernel BUG at ./include/linux/gfp.h:408!
>>>>>> [   30.109356] invalid opcode: 0000 [#1] SMP
>>>>>> [   30.109700] Modules linked in: fuse nf_conntrack_netbios_ns
>>>>>> nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT 
>>>>>> nf_reject_ipv6
>>>>>> xt_conntrack devlink ip_set nfnetlink ebtable_nat ebtable_broute 
>>>>>> bridge
>>>>>> ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 
>>>>>> ip6table_mangle
>>>>>> ip6table_raw ip6table_security iptable_nat nf_conntrack_ipv4 
>>>>>> nf_defrag_ipv4
>>>>>> nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw
>>>>>> iptable_security ebtable_filter ebtables ip6table_filter ip6_tables
>>>>>> snd_hda_codec_generic kvm_intel kvm snd_hda_intel snd_hda_codec 
>>>>>> irqbypass
>>>>>> ppdev snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm 
>>>>>> bochs_drm ttm
>>>>>> joydev drm_kms_helper virtio_balloon snd_timer snd parport_pc drm 
>>>>>> soundcore
>>>>>> parport i2c_piix4 nls_utf8 isofs squashfs zstd_decompress xxhash 
>>>>>> 8021q garp
>>>>>> mrp stp llc virtio_net
>>>>>> [   30.115605]  virtio_console virtio_scsi crct10dif_pclmul 
>>>>>> crc32_pclmul
>>>>>> crc32c_intel ghash_clmulni_intel serio_raw virtio_pci virtio_ring 
>>>>>> virtio
>>>>>> ata_generic pata_acpi qemu_fw_cfg sunrpc scsi_transport_iscsi loop
>>>>>> [   30.117425] CPU: 0 PID: 1347 Comm: gnome-shell Not tainted
>>>>>> 4.15.0-0.rc0.git6.1.fc28.x86_64 #1
>>>>>> [   30.118141] Hardware name: QEMU Standard PC (i440FX + PIIX, 
>>>>>> 1996), BIOS
>>>>>> 1.10.2-2.fc27 04/01/2014
>>>>>> [   30.118866] task: ffff923a77e03380 task.stack: ffffa78182228000
>>>>>> [   30.119366] RIP: 0010:__alloc_pages_nodemask+0x35e/0x430
>>>>>> [   30.119810] RSP: 0000:ffffa7818222bba8 EFLAGS: 00010202
>>>>>> [   30.120250] RAX: 0000000000000001 RBX: 00000000014382c6 RCX:
>>>>>> 0000000000000006
>>>>>> [   30.120840] RDX: 0000000000000000 RSI: 0000000000000009 RDI:
>>>>>> 0000000000000000
>>>>>> [   30.121443] RBP: ffff923a760d6000 R08: 0000000000000000 R09:
>>>>>> 0000000000000006
>>>>>> [   30.122039] R10: 0000000000000040 R11: 0000000000000300 R12:
>>>>>> ffff923a729273c0
>>>>>> [   30.122629] R13: 0000000000000000 R14: 0000000000000000 R15:
>>>>>> ffff923a7483d400
>>>>>> [   30.123223] FS:  00007fe48da7dac0(0000) GS:ffff923a7cc00000(0000)
>>>>>> knlGS:0000000000000000
>>>>>> [   30.123896] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>> [   30.124373] CR2: 00007fe457b73000 CR3: 0000000078313000 CR4:
>>>>>> 00000000000006f0
>>>>>> [   30.124968] Call Trace:
>>>>>> [   30.125186]  ttm_pool_populate+0x19b/0x400 [ttm]
>>>>>> [   30.125578]  ttm_bo_vm_fault+0x325/0x570 [ttm]
>>>>>> [   30.125964]  __do_fault+0x19/0x11e
>>>>>> [   30.126255]  __handle_mm_fault+0xcd3/0x1260
>>>>>> [   30.126609]  handle_mm_fault+0x14c/0x310
>>>>>> [   30.126947]  __do_page_fault+0x28c/0x530
>>>>>> [   30.127282]  do_page_fault+0x32/0x270
>>>>>> [   30.127593]  async_page_fault+0x22/0x30
>>>>>> [   30.127922] RIP: 0033:0x7fe48aae39a8
>>>>>> [   30.128225] RSP: 002b:00007ffc21c4d928 EFLAGS: 00010206
>>>>>> [   30.128664] RAX: 00007fe457b73000 RBX: 000055cd4c1041a0 RCX:
>>>>>> 00007fe457b73040
>>>>>> [   30.129259] RDX: 0000000000300000 RSI: 0000000000000000 RDI:
>>>>>> 00007fe457b73000
>>>>>> [   30.129855] RBP: 0000000000000300 R08: 000000000000000c R09:
>>>>>> 0000000100000000
>>>>>> [   30.130457] R10: 0000000000000001 R11: 0000000000000246 R12:
>>>>>> 000055cd4c1041a0
>>>>>> [   30.131054] R13: 000055cd4bdfe990 R14: 000055cd4c104110 R15:
>>>>>> 0000000000000400
>>>>>> [   30.131648] Code: 11 01 00 0f 84 a9 00 00 00 65 ff 0d 6d cc dd 
>>>>>> 44 e9 0f
>>>>>> ff ff ff 40 80 cd 80 e9 99 fe ff ff 48 89 c7 e8 e7 f6 01 00 e9 b7 
>>>>>> fe ff ff
>>>>>> <0f> 0b 0f ff e9 40 fd ff ff 65 48 8b 04 25 80 d5 00 00 8b 40 4c
>>>>>> [   30.133245] RIP: __alloc_pages_nodemask+0x35e/0x430 RSP: 
>>>>>> ffffa7818222bba8
>>>>>> [   30.133836] ---[ end trace d4f1deb60784f40a ]---
>>>>>>
>>>>>> This is based off of Linus' master branch at
>>>>>> c8a0739b185d11d6e2ca7ad9f5835841d1cfc765
>>>>>> Configs are at
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/commit/?h=rawhide&id=0be14662c54f49b4e640868b9d67df18d39edff0 
>>>>>>
>>>>>>
>>>>> Looks like a TTM regression due to:
>>>>>
>>>>> 0284f1ead87463bc17cf5e81a24fc65c052486f3
>>>>> drm/ttm: add transparent huge page support for cached allocations v2
>>>>>
>>>>> If the driver requests dma32 pages, we can end up trying to alloc 
>>>>> huge
>>>>> dma32 pages which triggers the oops. The bochs driver always requests
>>>>> dma32 here.
>>>>>
>>>>> I'll send a rough patch once I boot it.
>>>>>
>>>>> Dave.
>>>>
>>>> Hi Dave,
>>>>
>>>> fyi only: It looks like this is not the only regression in this 
>>>> cycle with
>>>> ttm, novueau seems to suffer as well [1].
>>> Adding ttm folks. Might be useful if we have an entry for ttm in
>>> MAINTAINERS ...
>>> -Daniel
>>
>>
>> A bit more of investigation for the nouveau regression: This only 
>> show when Transparent Hugepages (CONFIG_TRANSPARENT_HUGEPAGE) are 
>> enable. Thanks Dave for pointing me to that!
>
> Yeah, sorry for that. I missed to handle the DMA32 case with 
> transparent huge page support.
>
> Dave already came up with a fix which should be already submitted.
>
> Christian.


Hi Christian,

no problem, rc1 isn't even released, so hitting bugs is expected! Yet 
Daves fix ("drm/ttm: don't attempt to use hugepages if dma32 requested 
(v2)" [1]) is not enough to fix the problem and a similiar backtrace to 
the one posted below in my first replay to this thread can be observed 
with Daves patch applied [2].


Greetings,

Tobias


[1] https://patchwork.freedesktop.org/patch/189812/

[2]:


[  171.559316] ------------[ cut here ]------------
[  171.559335] kernel BUG at mm/shmem.c:4334!
[  171.559342] invalid opcode: 0000 [#1] PREEMPT SMP
[  171.559344] Modules linked in: fuse rfcomm af_packet bnep uvcvideo 
rtsx_usb_ms arc4 memstick videobuf2_vmalloc videobuf2_memops 
videobuf2_v4l2 videodev videobuf2_core btusb btrtl btbcm msr 
nls_iso8859_1 nls_cp437 vfat fat joydev hid_multitouch 
snd_hda_codec_hdmi ath10k_pci ath10k_core ath iTCO_wdt 
iTCO_vendor_support mac80211 snd_hda_codec_realtek intel_rapl 
snd_hda_codec_generic cfg80211 r8169 mii x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul 
crc32_pclmul intel_wmi_thunderbolt crc32c_intel acer_wmi sparse_keymap 
ghash_clmulni_intel snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep 
pcbc wmi_bmof snd_pcm snd_timer aesni_intel snd aes_x86_64 crypto_simd 
glue_helper cryptd pcspkr soundcore mei_me i2c_i801 mei thermal shpchp 
idma64 hci_uart serdev btqca intel_pch_thermal
[  171.559401]  intel_lpss_pci btintel ucsi_acpi bluetooth typec_ucsi 
tps6598x ecdh_generic ac typec battery rfkill tpm_crb tpm_tis 
tpm_tis_core pinctrl_sunrisepoint intel_lpss_acpi pinctrl_intel 
intel_lpss tpm acpi_pad hid_generic usbhid rtsx_usb_sdmmc mmc_core 
rtsx_usb nouveau mxm_wmi ttm serio_raw i915 i2c_algo_bit drm_kms_helper 
syscopyarea sysfillrect xhci_pci sysimgblt fb_sys_fops xhci_hcd usbcore 
drm i2c_hid wmi video button sg efivarfs
[  171.559437] CPU: 4 PID: 131 Comm: kworker/u16:2 Tainted: G        
W        4.14.0-desktop-rc0-debug+ #4
[  171.559439] Hardware name: Acer Aspire VN7-593G/Pluto_KLS, BIOS V1.06 
07/05/2017
[  171.559445] Workqueue: ttm_swap ttm_shrink_work [ttm]
[  171.559448] task: ffff8f8c33b66400 task.stack: ffffa05fc1740000
[  171.559453] RIP: 0010:shmem_read_mapping_page_gfp+0x4c/0x50
[  171.559454] RSP: 0018:ffffa05fc1743d00 EFLAGS: 00010206
[  171.559457] RAX: ffff8f8c30f34580 RBX: ffff8f8bcec83400 RCX: 
fffff74489520f80
[  171.559459] RDX: 00000000014200ca RSI: 0000000000000000 RDI: 
ffff8f8c30f34360
[  171.559460] RBP: ffffa05fc1743d08 R08: 0000000000000000 R09: 
ffffffffffffffff
[  171.559462] R10: 0000000000000000 R11: 0000000000000001 R12: 
0000000000000000
[  171.559463] R13: ffff8f8c30f34580 R14: ffff8f8c323b7538 R15: 
ffff8f8c34ee7800
[  171.559465] FS:  0000000000000000(0000) GS:ffff8f8c3ed00000(0000) 
knlGS:0000000000000000
[  171.559467] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  171.559469] CR2: 00005583f0c37dc0 CR3: 00000001abc10004 CR4: 
00000000003606e0
[  171.559470] Call Trace:
[  171.559476]  ttm_tt_swapout+0x156/0x280 [ttm]
[  171.559482]  ttm_bo_swapout+0x217/0x260 [ttm]
[  171.559486]  ? serio_raw_write+0x50/0x100 [serio_raw]
[  171.559491]  ttm_shrink+0xab/0xe0 [ttm]
[  171.559496]  ttm_shrink_work+0x14/0x20 [ttm]
[  171.559499]  process_one_work+0x1e3/0x400
[  171.559501]  ? process_one_work+0x17c/0x400
[  171.559506]  worker_thread+0x30/0x3a0
[  171.559510]  kthread+0x152/0x170
[  171.559512]  ? process_one_work+0x400/0x400
[  171.559514]  ? kthread_create_worker_on_cpu+0x40/0x40
[  171.559518]  ret_from_fork+0x24/0x30
[  171.559523] Code: 8d 55 f8 6a 00 45 31 c9 b9 01 00 00 00 e8 6d f0 ff 
ff 85 c0 5a 59 74 04 48 98 c9 c3 48 8b 7d f8 e8 fa de fd ff 48 8b 45 f8 
c9 c3 <0f> 0b 66 90 55 48 89 e5 41 56 41 55 41 54 53 48 89 fb 48 83 ec
[  171.559567] RIP: shmem_read_mapping_page_gfp+0x4c/0x50 RSP: 
ffffa05fc1743d00
[  171.559570] ---[ end trace 3c2332c10029c3cd ]---
[  185.835630] swiotlb_tbl_map_single: 24 callbacks suppressed
[  185.835632] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 
bytes)
[  185.835635] swiotlb: coherent allocation failed for device 
0000:01:00.0 size=2097152
[  185.835637] CPU: 1 PID: 68 Comm: kworker/1:1 Tainted: G      D 
W        4.14.0-desktop-rc0-debug+ #4
[  185.835638] Hardware name: Acer Aspire VN7-593G/Pluto_KLS, BIOS V1.06 
07/05/2017
[  185.835642] Workqueue: pm pm_runtime_work
[  185.835644] Call Trace:
[  185.835648]  dump_stack+0x8e/0xcb
[  185.835650]  swiotlb_alloc_coherent+0xe4/0x160
[  185.835653]  x86_swiotlb_alloc_coherent+0x3e/0x50
[  185.835659]  ttm_dma_pool_get_pages+0x1e1/0x5d0 [ttm]
[  185.835664]  ttm_dma_populate+0x244/0x330 [ttm]
[  185.835692]  nouveau_ttm_tt_populate+0x142/0x1f0 [nouveau]
[  185.835695]  ttm_tt_bind+0x23/0x50 [ttm]
[  185.835698]  ttm_bo_handle_move_mem+0x570/0x5a0 [ttm]
[  185.835720]  ? gf119_disp_chan_uevent_fini+0x60/0x70 [nouveau]
[  185.835724]  ttm_bo_evict+0x146/0x340 [ttm]
[  185.835727]  ? retint_kernel+0x2d/0x2d
[  185.835732]  ttm_mem_evict_first+0x14c/0x1b0 [ttm]
[  185.835736]  ttm_bo_force_list_clean+0x68/0x130 [ttm]
[  185.835739]  ? pci_pm_runtime_resume+0xa0/0xa0
[  185.835741]  ttm_bo_evict_mm+0x21/0x50 [ttm]
[  185.835762]  nouveau_do_suspend+0x7c/0x2b0 [nouveau]
[  185.835780]  nouveau_pmops_runtime_suspend+0x54/0xc0 [nouveau]
[  185.835783]  pci_pm_runtime_suspend+0x5a/0x170
[  185.835785]  ? pci_pm_runtime_resume+0xa0/0xa0
[  185.835787]  __rpm_callback+0xb4/0x1e0
[  185.835789]  ? pci_pm_runtime_resume+0xa0/0xa0
[  185.835791]  rpm_callback+0x1f/0x80
[  185.835793]  ? pci_pm_runtime_resume+0xa0/0xa0
[  185.835795]  rpm_suspend+0x119/0x530
[  185.835797]  ? pm_runtime_work+0x19/0xc0
[  185.835799]  pm_runtime_work+0x76/0xc0
[  185.835802]  process_one_work+0x1e3/0x400
[  185.835803]  ? process_one_work+0x17c/0x400
[  185.835807]  worker_thread+0x30/0x3a0
[  185.835809]  kthread+0x152/0x170
[  185.835811]  ? process_one_work+0x400/0x400
[  185.835813]  ? kthread_create_worker_on_cpu+0x40/0x40
[  185.835815]  ret_from_fork+0x24/0x30

...

>
>>
>>
>> Greetings,
>>
>> Tobias
>>
>>
>>>> Greetings,
>>>>
>>>> Tobias
>>>>
>>>>
>>>> [1]:
>>>>
>>>>
>>>> [  404.918139] ------------[ cut here ]------------
>>>> [  404.918147] kernel BUG at mm/shmem.c:4334!
>>>> [  404.918152] invalid opcode: 0000 [#2] PREEMPT SMP
>>>> [  404.918157] Modules linked in: rfcomm af_packet bnep uvcvideo
>>>> videobuf2_vmalloc videobuf2_memops rtsx_usb_ms videobuf2_v4l2 memstick
>>>> videodev videobuf2_core btusb btrtl btbcm arc4 msr snd_hda_codec_hdmi
>>>> snd_hda_codec_realtek snd_hda_codec_generic joydev nls_iso8859_1 
>>>> nls_cp437
>>>> hid_multitouch vfat fat iTCO_wdt iTCO_vendor_support intel_rapl
>>>> x86_pkg_temp_thermal intel_powerclamp ath10k_pci coretemp 
>>>> ath10k_core ath
>>>> kvm_intel mac80211 kvm irqbypass crct10dif_pclmul crc32_pclmul 
>>>> crc32c_intel
>>>> ghash_clmulni_intel r8169 mii snd_hda_intel pcbc cfg80211 
>>>> snd_hda_codec
>>>> wmi_bmof snd_hda_core snd_hwdep acer_wmi sparse_keymap snd_pcm
>>>> intel_wmi_thunderbolt aesni_intel snd_timer aes_x86_64 crypto_simd
>>>> glue_helper cryptd snd soundcore idma64 pcspkr i2c_i801 mei_me shpchp
>>>> intel_pch_thermal mei intel_lpss_pci ucsi_acpi
>>>> [  404.918239]  typec_ucsi thermal hci_uart serdev btqca tps6598x 
>>>> typec
>>>> btintel tpm_crb ac bluetooth tpm_tis intel_lpss_acpi tpm_tis_core
>>>> ecdh_generic battery pinctrl_sunrisepoint rfkill pinctrl_intel 
>>>> intel_lpss
>>>> tpm acpi_pad hid_generic usbhid rtsx_usb_sdmmc mmc_core rtsx_usb 
>>>> nouveau
>>>> mxm_wmi ttm serio_raw i915 i2c_algo_bit drm_kms_helper syscopyarea 
>>>> xhci_pci
>>>> sysfillrect sysimgblt fb_sys_fops xhci_hcd drm usbcore i2c_hid wmi 
>>>> video
>>>> button sg efivarfs
>>>> [  404.918289] CPU: 1 PID: 2739 Comm: Civ6 Tainted: G D
>>>> 4.14.0-desktop-rc0-debug+ #1
>>>> [  404.918295] Hardware name: Acer Aspire VN7-593G/Pluto_KLS, BIOS 
>>>> V1.06
>>>> 07/05/2017
>>>> [  404.918301] task: ffff9b3b49c7e280 task.stack: ffffb9a2035b4000
>>>> [  404.918308] RIP: 0010:shmem_read_mapping_page_gfp+0x4c/0x50
>>>> [  404.918313] RSP: 0018:ffffb9a2035b79c0 EFLAGS: 00010206
>>>> [  404.918317] RAX: ffff9b3b4dd17700 RBX: ffff9b3b759cb900 RCX:
>>>> ffffe4f10ac8b2c0
>>>> [  404.918322] RDX: 00000000014200ca RSI: 0000000000000000 RDI:
>>>> ffff9b3b4dd174e0
>>>> [  404.918327] RBP: ffffb9a2035b79c8 R08: 0000000000000000 R09:
>>>> ffffffffffffffff
>>>> [  404.918332] R10: 0000000000000000 R11: 0000000000000000 R12:
>>>> 0000000000000000
>>>> [  404.918337] R13: ffff9b3b4dd17700 R14: ffff9b3b7253eb38 R15:
>>>> ffff9b3b75341000
>>>> [  404.918343] FS:  00007fa952f69700(0000) GS:ffff9b3b7ec40000(0000)
>>>> knlGS:0000000000000000
>>>> [  404.918348] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [  404.918353] CR2: 0000560940b5d000 CR3: 0000000193e94004 CR4:
>>>> 00000000003606e0
>>>> [  404.918358] Call Trace:
>>>> [  404.918365]  ttm_tt_swapout+0x156/0x280 [ttm]
>>>> [  404.918371]  ttm_bo_swapout+0x217/0x260 [ttm]
>>>> [  404.918379]  ttm_shrink+0xab/0xe0 [ttm]
>>>> [  404.918384] ttm_mem_global_alloc_zone.constprop.6+0xd1/0x140 [ttm]
>>>> [  404.918391]  ttm_mem_global_alloc+0x11/0x20 [ttm]
>>>> [  404.918397]  ttm_bo_init_reserved+0x47/0x4f0 [ttm]
>>>> [  404.918403]  ttm_bo_init+0x29/0xa0 [ttm]
>>>> [  404.918430]  ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
>>>> [  404.918454]  nouveau_bo_new+0x3f5/0x550 [nouveau]
>>>> [  404.918474]  ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
>>>> [  404.918495]  nouveau_gem_new+0x48/0x100 [nouveau]
>>>> [  404.918514]  nouveau_gem_ioctl_new+0x45/0xc0 [nouveau]
>>>> [  404.918532]  ? nouveau_gem_new+0x100/0x100 [nouveau]
>>>> [  404.918543]  drm_ioctl_kernel+0x58/0xb0 [drm]
>>>> [  404.918551]  drm_ioctl+0x315/0x3d0 [drm]
>>>> [  404.918568]  ? nouveau_gem_new+0x100/0x100 [nouveau]
>>>> [  404.918576]  ? trace_hardirqs_on+0xd/0x10
>>>> [  404.918595]  nouveau_drm_ioctl+0x6d/0xb0 [nouveau]
>>>> [  404.918601]  do_vfs_ioctl+0x8e/0x660
>>>> [  404.918605]  ? __fget+0x102/0x1f0
>>>> [  404.918609]  SyS_ioctl+0x74/0x80
>>>> [  404.918615]  entry_SYSCALL_64_fastpath+0x23/0x9a
>>>> [  404.918619] RIP: 0033:0x7fa96396d2f7
>>>> [  404.918622] RSP: 002b:00007fa952f43728 EFLAGS: 00000246 ORIG_RAX:
>>>> 0000000000000010
>>>> [  404.918628] RAX: ffffffffffffffda RBX: 00007fa93cad59c0 RCX:
>>>> 00007fa96396d2f7
>>>> [  404.918633] RDX: 00007fa952f43780 RSI: 00000000c0306480 RDI:
>>>> 0000000000000022
>>>> [  404.918638] RBP: 0000000000100000 R08: 0000000000000000 R09:
>>>> 0000000000000000
>>>> [  404.918643] R10: 00007fa852fa0260 R11: 0000000000000246 R12:
>>>> 00007fa91c053370
>>>> [  404.918648] R13: 0000000000100000 R14: 00007fa93e579a70 R15:
>>>> 00007fa8530a1aa0
>>>> [  404.918656] Code: 8d 55 f8 6a 00 45 31 c9 b9 01 00 00 00 e8 6d 
>>>> f0 ff ff
>>>> 85 c0 5a 59 74 04 48 98 c9 c3 48 8b 7d f8 e8 fa de fd ff 48 8b 45 
>>>> f8 c9 c3
>>>> <0f> 0b 66 90 55 48 89 e5 41 56 41 55 41 54 53 48 89 fb 48 83 ec
>>>> [  404.918698] RIP: shmem_read_mapping_page_gfp+0x4c/0x50 RSP:
>>>> ffffb9a2035b79c0
>>>> [  404.918711] ---[ end trace 53b254d8157cf0e7 ]---
>>>>
>>>>
>>>>
>>>>
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>>>> dri-devel@...ts.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>

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