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Date:   Thu, 23 Nov 2017 15:24:38 +0100
From:   Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
To:     Dave Airlie <airlied@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Regression in TTM driver w/Linus' master


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].

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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