Message-ID: <CADnq5_OtdUvOUPpq1aUoxtgpt6a4h598019SNhe+9ZWUaANYqg@mail.gmail.com>
Date: Tue, 24 Sep 2024 10:22:18 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Arthur Marsh <arthur.marsh@...ernode.on.net>, Xinhui.Pan@....com, airlied@...il.com, 
	alexander.deucher@....com, amd-gfx@...ts.freedesktop.org, 
	christian.koenig@....com, daniel@...ll.ch, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, wuhoipok@...il.com, iommu@...ts.linux.dev, 
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: radeon ARUBA NULL pointer dereference

On Tue, Sep 24, 2024 at 8:43 AM Thomas Zimmermann <tzimmermann@...e.de> wrote:
>
>
>
> Am 24.09.24 um 14:20 schrieb Thomas Zimmermann:
> > (cc: DMA and x86 folks)
> >
> > Hi
> >
> > Am 24.09.24 um 04:08 schrieb Arthur Marsh:
> >> Using current Linus git head kernel, I was able to save the dmesg
> >> output:
> >>
> >> [   17.218724] [drm] radeon kernel modesetting enabled.
> >> [   17.218778] radeon 0000:00:01.0: vgaarb: deactivate vga console
> >> [   17.219509] Console: switching to colour dummy device 80x25
> >> [   17.219700] [drm] initializing kernel modesetting (ARUBA
> >> 0x1002:0x990C 0x1002:0x0123 0x00).
> >> [   17.219773] ATOM BIOS: 113
> >> [   17.219838] radeon 0000:00:01.0: VRAM: 768M 0x0000000000000000 -
> >> 0x000000002FFFFFFF (768M used)
> >> [   17.219841] radeon 0000:00:01.0: GTT: 1024M 0x0000000030000000 -
> >> 0x000000006FFFFFFF
> >> [   17.219844] [drm] Detected VRAM RAM=768M, BAR=256M
> >> [   17.219845] [drm] RAM width 64bits DDR
> >> [   17.219851] BUG: kernel NULL pointer dereference, address:
> >> 00000000000000a0
> >
> > This is 160 bytes behind NULL, which indicates a field within a struct.
> >
> >> [   17.219852] #PF: supervisor read access in kernel mode
> >> [   17.219853] #PF: error_code(0x0000) - not-present page
> >> [   17.219854] PGD 0 P4D 0
> >> [   17.219856] Oops: Oops: 0000 [#1] PREEMPT_RT SMP NOPTI
> >> [   17.219858] CPU: 0 UID: 0 PID: 451 Comm: udevd Not tainted 6.11.0+
> >> #6121
> >> [   17.219860] Hardware name: Gigabyte Technology Co., Ltd. To be
> >> filled by O.E.M./F2A78M-HD2, BIOS F2 05/28/2014
> >> [   17.219862] RIP: 0010:dma_get_required_mask+0x11/0x50
> >> [   17.219868] Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90
> >> 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 48 8b 87 68 02 00 00 48 85
> >> c0 74 11 <48> 8b 80 a0 00 00 00 48 85 c0 74 1f e9 ee ed 94 00 f6 87
> >> 2c 03 00
> >> [   17.219870] RSP: 0018:ffffa54bc13a7b00 EFLAGS: 00010202
> >> [   17.219871] RAX: 0000000000000000 RBX: 000000ffffffffff RCX:
> >> 0000000000000000
> >> [   17.219872] RDX: 0000000000000000 RSI: 0000000000000027 RDI:
> >> ffff976f44e720c8
> >> [   17.219873] RBP: ffff976f44e720c8 R08: 00000000ffffefff R09:
> >> ffffffffab2aab08
> >> [   17.219874] R10: 00000000fffff000 R11: 0000000000000002 R12:
> >> 0000000000000000
> >> [   17.219875] R13: ffff976f48a4aa30 R14: 0000000000000000 R15:
> >> 0000000000000028
> >> [   17.219876] FS:  00007f59a070d840(0000) GS:ffff97726f800000(0000)
> >> knlGS:0000000000000000
> >> [   17.219878] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> [   17.219879] CR2: 00000000000000a0 CR3: 00000001053b4000 CR4:
> >> 00000000000406f0
> >> [   17.219880] Call Trace:
> >> [   17.219881]  <TASK>
> >> [   17.219882]  ? __die_body.cold+0x19/0x1e
> >> [   17.219885]  ? page_fault_oops+0xa8/0x230
> >> [   17.219889]  ? search_module_extables+0x4f/0x90
> >> [   17.219891]  ? fixup_exception+0x36/0x2f0
> >> [   17.219894]  ? exc_page_fault+0x88/0x1b0
> >> [   17.219897]  ? asm_exc_page_fault+0x22/0x30
> >> [   17.219900]  ? dma_get_required_mask+0x11/0x50

Also reported here:
https://gitlab.freedesktop.org/drm/amd/-/issues/3648

Alex

> >
> > This is not in the radeon driver but the DMA code. I'd say it's at
> > [1], as get_required_mask is 160 bytes within struct drm_map_ops. The
> > call to get_arch_dma_ops() probably returns NULL.
>
> And indeed, when I added
>
>      pr_warn("dev dma ops: 0x%p\n", pdev->dev.dma_ops);
>      pr_warn("arch dma ops: 0x%p\n", get_arch_dma_ops());
>
> to radeon_pci_probe(), I got
>
> [   22.325657] dev dma ops: 0x0000000000000000
> [   22.342921] arch dma ops: 0x0000000000000000
>
> as a result.
>
> Best regards
> Thomas
>
> >
> > Best regards
> > Thomas
> >
> > [1]
> > https://elixir.bootlin.com/linux/v6.11/source/kernel/dma/mapping.c#L523
> > [2]
> > https://elixir.bootlin.com/linux/v6.11/source/include/linux/dma-map-ops.h#L98
> >
> >> [   17.219902] dma_addressing_limited+0x6c/0xb0
> >> [   17.219905]  radeon_ttm_init+0x3f/0x210 [radeon]
> >> [   17.219977]  cayman_init+0x97/0x290 [radeon]
> >> [   17.220057]  radeon_device_init+0x5e9/0xb40 [radeon]
> >> [   17.220115]  radeon_driver_load_kms+0xb0/0x260 [radeon]
> >> [   17.220174]  radeon_pci_probe+0xff/0x170 [radeon]
> >> [   17.220231]  pci_device_probe+0xbe/0x1a0
> >> [   17.220234]  really_probe+0xde/0x350
> >> [   17.220237]  ? pm_runtime_barrier+0x61/0xb0
> >> [   17.220240]  ? __pfx___driver_attach+0x10/0x10
> >> [   17.220242]  __driver_probe_device+0x78/0x110
> >> [   17.220245]  driver_probe_device+0x2d/0xc0
> >> [   17.220247]  __driver_attach+0xc9/0x1c0
> >> [   17.220249]  bus_for_each_dev+0x6a/0xb0
> >> [   17.220251]  ? migrate_enable+0xbf/0xf0
> >> [   17.220254]  bus_add_driver+0x139/0x220
> >> [   17.220256]  driver_register+0x6e/0xc0
> >> [   17.220258]  ? __pfx_radeon_module_init+0x10/0x10 [radeon]
> >> [   17.220315]  do_one_initcall+0x42/0x210
> >> [   17.220318]  ? __kmalloc_cache_noprof+0x89/0x230
> >> [   17.220321]  do_init_module+0x60/0x210
> >> [   17.220324]  init_module_from_file+0x89/0xc0
> >> [   17.220326]  __x64_sys_finit_module+0x142/0x390
> >> [   17.220329]  do_syscall_64+0x47/0x110
> >> [   17.220331]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> >> [   17.220334] RIP: 0033:0x7f59a0625279
> >> [   17.220336] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
> >> 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24
> >> 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 77 6b 0d 00 f7 d8 64
> >> 89 01 48
> >> [   17.220337] RSP: 002b:00007ffd15ee7df8 EFLAGS: 00000246 ORIG_RAX:
> >> 0000000000000139
> >> [   17.220339] RAX: ffffffffffffffda RBX: 00005578ae660840 RCX:
> >> 00007f59a0625279
> >> [   17.220340] RDX: 0000000000000000 RSI: 00005578ae677fc0 RDI:
> >> 0000000000000011
> >> [   17.220341] RBP: 0000000000000000 R08: 00007f59a06fcb20 R09:
> >> 00005578ae640550
> >> [   17.220342] R10: 0000000000000040 R11: 0000000000000246 R12:
> >> 00005578ae677fc0
> >> [   17.220342] R13: 0000000000020000 R14: 00005578ae651750 R15:
> >> 0000000000000000
> >> [   17.220344]  </TASK>
> >> [   17.220345] Modules linked in: radeon(+) snd_hda_codec_hdmi
> >> snd_seq_midi snd_seq_midi_event snd_seq snd_hda_intel
> >> snd_intel_dspcfg snd_emu10k1 snd_hda_codec drm_ttm_helper ttm
> >> snd_util_mem drm_suballoc_helper snd_ac97_codec snd_hda_core
> >> drm_display_helper ac97_bus snd_rawmidi snd_hwdep snd_seq_device
> >> snd_pcm drm_kms_helper edac_mce_amd sha512_ssse3 sha512_generic
> >> k10temp sha256_ssse3 sha1_ssse3 drm aesni_intel snd_timer gf128mul
> >> crypto_simd cryptd acpi_cpufreq evdev pcspkr serio_raw emu10k1_gp
> >> gameport at24 regmap_i2c i2c_algo_bit snd video soundcore wmi button
> >> sp5100_tco ext4 crc32c_generic crc16 mbcache jbd2 uas usb_storage
> >> hid_generic usbhid hid sg sr_mod sd_mod cdrom ata_generic
> >> firewire_ohci crc32_pclmul crc32c_intel firewire_core crc_itu_t
> >> pata_atiixp i2c_piix4 i2c_smbus ahci r8169 libahci xhci_pci ohci_pci
> >> realtek libata mdio_devres ehci_pci ohci_hcd xhci_hcd scsi_mod
> >> ehci_hcd scsi_common usbcore libphy usb_common
> >> [   17.220388] CR2: 00000000000000a0
> >> [   17.220390] ---[ end trace 0000000000000000 ]---
> >>
> >> Happy to provide additional information and run tests.
> >>
> >> Regards,
> >>
> >> Arthur Marsh.
> >
>
> --
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
>

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