Re: 2b5d1c29f6c4 ("drm/nouveau/disp: PIOR DP uses GPIO for HPD, not PMGR AUX interrupts")

From: Takashi Iwai
Date: Wed Aug 09 2023 - 05:21:50 EST

On Tue, 08 Aug 2023 12:39:32 +0200,
Karol Herbst wrote:
>
> On Mon, Aug 7, 2023 at 5:05 PM Borislav Petkov <bp@xxxxxxxxx> wrote:
> >
> > On Mon, Aug 07, 2023 at 01:49:42PM +0200, Karol Herbst wrote:
> > > in what way does it stop? Just not progressing? That would be kinda
> > > concerning. Mind tracing with what arguments `nvkm_uevent_add` is
> > > called with and without that patch?
> >
> > Well, me dumping those args I guess made the box not freeze before
> > catching a #PF over serial. Does that help?
> >
> > ....
> > [ 3.410135] Unpacking initramfs...
> > [ 3.416319] software IO TLB: mapped [mem 0x00000000a877d000-0x00000000ac77d000] (64MB)
> > [ 3.418227] Initialise system trusted keyrings
> > [ 3.432273] workingset: timestamp_bits=56 max_order=22 bucket_order=0
> > [ 3.439006] ntfs: driver 2.1.32 [Flags: R/W].
> > [ 3.443368] fuse: init (API version 7.38)
> > [ 3.447601] 9p: Installing v9fs 9p2000 file system support
> > [ 3.453223] Key type asymmetric registered
> > [ 3.457332] Asymmetric key parser 'x509' registered
> > [ 3.462236] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
> > [ 3.475865] efifb: probing for efifb
> > [ 3.479458] efifb: framebuffer at 0xf9000000, using 1920k, total 1920k
> > [ 3.485969] efifb: mode is 800x600x32, linelength=3200, pages=1
> > [ 3.491872] efifb: scrolling: redraw
> > [ 3.495438] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
> > [ 3.502349] Console: switching to colour frame buffer device 100x37
> > [ 3.509564] fb0: EFI VGA frame buffer device
> > [ 3.514013] ACPI: \_PR_.CP00: Found 4 idle states
> > [ 3.518850] ACPI: \_PR_.CP01: Found 4 idle states
> > [ 3.523687] ACPI: \_PR_.CP02: Found 4 idle states
> > [ 3.528515] ACPI: \_PR_.CP03: Found 4 idle states
> > [ 3.533346] ACPI: \_PR_.CP04: Found 4 idle states
> > [ 3.538173] ACPI: \_PR_.CP05: Found 4 idle states
> > [ 3.543003] ACPI: \_PR_.CP06: Found 4 idle states
> > [ 3.544219] Freeing initrd memory: 8196K
> > [ 3.547844] ACPI: \_PR_.CP07: Found 4 idle states
> > [ 3.609542] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> > [ 3.616224] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> > [ 3.625552] serial 0000:00:16.3: enabling device (0000 -> 0003)
> > [ 3.633034] 0000:00:16.3: ttyS1 at I/O 0xf0a0 (irq = 17, base_baud = 115200) is a 16550A
> > [ 3.642451] Linux agpgart interface v0.103
> > [ 3.647141] ACPI: bus type drm_connector registered
> > [ 3.653261] Console: switching to colour dummy device 80x25
> > [ 3.659092] nouveau 0000:03:00.0: vgaarb: deactivate vga console
> > [ 3.665174] nouveau 0000:03:00.0: NVIDIA GT218 (0a8c00b1)
> > [ 3.784585] nouveau 0000:03:00.0: bios: version 70.18.83.00.08
> > [ 3.792244] nouveau 0000:03:00.0: fb: 512 MiB DDR3
> > [ 3.948786] nouveau 0000:03:00.0: DRM: VRAM: 512 MiB
> > [ 3.953755] nouveau 0000:03:00.0: DRM: GART: 1048576 MiB
> > [ 3.959073] nouveau 0000:03:00.0: DRM: TMDS table version 2.0
> > [ 3.964808] nouveau 0000:03:00.0: DRM: DCB version 4.0
> > [ 3.969938] nouveau 0000:03:00.0: DRM: DCB outp 00: 02000360 00000000
> > [ 3.976367] nouveau 0000:03:00.0: DRM: DCB outp 01: 02000362 00020010
> > [ 3.982792] nouveau 0000:03:00.0: DRM: DCB outp 02: 028003a6 0f220010
> > [ 3.989223] nouveau 0000:03:00.0: DRM: DCB outp 03: 01011380 00000000
> > [ 3.995647] nouveau 0000:03:00.0: DRM: DCB outp 04: 08011382 00020010
> > [ 4.002076] nouveau 0000:03:00.0: DRM: DCB outp 05: 088113c6 0f220010
> > [ 4.008511] nouveau 0000:03:00.0: DRM: DCB conn 00: 00101064
> > [ 4.014151] nouveau 0000:03:00.0: DRM: DCB conn 01: 00202165
> > [ 4.021710] nvkm_uevent_add: uevent: 0xffff888100242100, event: 0xffff8881022de1a0, id: 0x0, bits: 0x1, func: 0x0000000000000000
> > [ 4.033680] nvkm_uevent_add: uevent: 0xffff888100242300, event: 0xffff8881022de1a0, id: 0x0, bits: 0x1, func: 0x0000000000000000
> > [ 4.045429] nouveau 0000:03:00.0: DRM: MM: using COPY for buffer copies
> > [ 4.052059] stackdepot: allocating hash table of 1048576 entries via kvcalloc
> > [ 4.067191] nvkm_uevent_add: uevent: 0xffff888100242800, event: 0xffff888104b3e260, id: 0x0, bits: 0x1, func: 0x0000000000000000
> > [ 4.078936] nvkm_uevent_add: uevent: 0xffff888100242900, event: 0xffff888104b3e260, id: 0x1, bits: 0x1, func: 0x0000000000000000
> > [ 4.090514] nvkm_uevent_add: uevent: 0xffff888100242a00, event: 0xffff888102091f28, id: 0x1, bits: 0x3, func: 0xffffffff8177b700
> > [ 4.102118] tsc: Refined TSC clocksource calibration: 3591.345 MHz
> > [ 4.108342] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x33c4635c383, max_idle_ns: 440795314831 ns
> > [ 4.108401] nvkm_uevent_add: uevent: 0xffff8881020b6000, event: 0xffff888102091f28, id: 0xf, bits: 0x3, func: 0xffffffff8177b700
> > [ 4.129864] clocksource: Switched to clocksource tsc
> > [ 4.131478] [drm] Initialized nouveau 1.3.1 20120801 for 0000:03:00.0 on minor 0
> > [ 4.143806] BUG: kernel NULL pointer dereference, address: 0000000000000020
>
> ahh, that would have been good to know :) Mind figuring out what's
> exactly NULL inside nvif_object_mthd? Or rather what line
> `nvif_object_mthd+0x136` belongs to, then it should be easy to figure
> out what's wrong here.

FWIW, we've hit the bug on openSUSE Tumbleweed 6.4.8 kernel:
https://bugzilla.suse.com/show_bug.cgi?id=1214073
Confirmed that reverting the patch cured the issue.

FWIW, loading nouveau showed a refcount_t warning just before the NULL
dereference:

[ 163.237655] ACPI Warning: \_SB.PCI0.IXVE.IGPU._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20230331/nsarguments-61)
[ 163.237700] ACPI: \_SB_.PCI0.IXVE.IGPU: failed to evaluate _DSM
[ 163.237755] nouveau 0000:02:00.0: enabling device (0002 -> 0003)
[ 163.238089] ACPI: \_SB_.PCI0.LGPU: Enabled at IRQ 20
[ 163.249419] Console: switching to colour dummy device 80x25
[ 163.266174] nouveau 0000:02:00.0: vgaarb: deactivate vga console
[ 163.266307] nouveau 0000:02:00.0: NVIDIA MCP79/MCP7A (0ac180b1)
[ 163.287303] nouveau 0000:02:00.0: bios: version 62.79.40.00.01
[ 163.309529] nouveau 0000:02:00.0: fb: 256 MiB stolen system memory
[ 163.383121] nouveau 0000:02:00.0: DRM: VRAM: 256 MiB
[ 163.383132] nouveau 0000:02:00.0: DRM: GART: 1048576 MiB
[ 163.383138] nouveau 0000:02:00.0: DRM: TMDS table version 2.0
[ 163.383142] nouveau 0000:02:00.0: DRM: DCB version 4.0
[ 163.383145] nouveau 0000:02:00.0: DRM: DCB outp 00: 01000123 00010014
[ 163.383150] nouveau 0000:02:00.0: DRM: DCB outp 01: 02021232 00000010
[ 163.383154] nouveau 0000:02:00.0: DRM: DCB outp 02: 02021286 0f220010
[ 163.383158] nouveau 0000:02:00.0: DRM: DCB conn 00: 00000040
[ 163.383162] nouveau 0000:02:00.0: DRM: DCB conn 01: 0000a146
[ 163.385635] nouveau 0000:02:00.0: DRM: MM: using M2MF for buffer copies
[ 163.417977] ------------[ cut here ]------------
[ 163.417988] refcount_t: saturated; leaking memory.
[ 163.418012] WARNING: CPU: 1 PID: 2873 at lib/refcount.c:19 refcount_warn_saturate+0x9b/0x110
[ 163.418022] Modules linked in: nouveau(+) button mxm_wmi i2c_algo_bit drm_display_helper drm_ttm_helper xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_addrtype iptable_filter bpfilter br_netfilter bridge stp llc overlay ccm af_packet bnep btusb btrtl btbcm btintel btmtk bluetooth ecdh_generic uvcvideo rtl8xxxu videobuf2_vmalloc mac80211 uvc videobuf2_memops videobuf2_v4l2 videodev libarc4 videobuf2_common mc cfg80211 hid_appleir hid_apple bcm5974 apple_mfi_fastcharge iscsi_ibft iscsi_boot_sysfs joydev rfkill qrtr z3fold snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio coretemp snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec kvm_intel snd_hda_core applesmc snd_hwdep kvm snd_pcm irqbypass pcspkr acpi_cpufreq snd_timer binfmt_misc snd forcedeth soundcore squashfs nls_iso8859_1 loop nls_cp437 vfat fat i2c_nforce2 acpi_als industrialio_triggered_buffer kfifo_buf indu
strialio sbs sbshc apple_bl ac
[ 163.418129] tiny_power_button fuse efi_pstore configfs dmi_sysfs ip_tables x_tables hid_generic usbhid ttm video wmi cec ohci_pci ohci_hcd ehci_pci rc_core sr_mod ehci_hcd sha512_ssse3 cdrom usbcore nv_tco btrfs blake2b_generic libcrc32c xor raid6_pq sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua msr efivarfs [last unloaded: button]
[ 163.418177] CPU: 1 PID: 2873 Comm: modprobe Not tainted 6.4.8-1-default #1 openSUSE Tumbleweed 5f0d78911475bf45bbeef64510275b9fba2542b1
[ 163.418183] Hardware name: Apple Inc. MacBook5,1/Mac-F42D89C8, BIOS MB51.88Z.007D.B03.0904271443 04/27/09
[ 163.418187] RIP: 0010:refcount_warn_saturate+0x9b/0x110
[ 163.418192] Code: 01 01 e8 68 7b aa ff 0f 0b c3 cc cc cc cc 80 3d e6 e1 a8 01 00 75 a8 48 c7 c7 d0 ed 05 a4 c6 05 d6 e1 a8 01 01 e8 45 7b aa ff <0f> 0b c3 cc cc cc cc 80 3d c0 e1 a8 01 00 75 85 48 c7 c7 28 ee 05
[ 163.418196] RSP: 0018:ffffbae941613aa0 EFLAGS: 00010086
[ 163.418200] RAX: 0000000000000000 RBX: ffff951bc88c2000 RCX: 0000000000000027
[ 163.418204] RDX: ffff951cf81274c8 RSI: 0000000000000001 RDI: ffff951cf81274c0
[ 163.418207] RBP: 0000000000000246 R08: 0000000000000000 R09: ffffbae941613948
[ 163.418210] R10: 0000000000000003 R11: ffffffffa4958d48 R12: ffff951be0df3a58
[ 163.418213] R13: ffffbae941613ad8 R14: ffff951be0df3800 R15: 0000000000000000
[ 163.418216] FS: 00007f81c0247740(0000) GS:ffff951cf8100000(0000) knlGS:0000000000000000
[ 163.418220] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 163.418223] CR2: 00005653d818cd64 CR3: 000000012c72a000 CR4: 00000000000006e0
[ 163.418226] Call Trace:
[ 163.418231] <TASK>
[ 163.418234] ? refcount_warn_saturate+0x9b/0x110
[ 163.418238] ? __warn+0x81/0x130
[ 163.418248] ? refcount_warn_saturate+0x9b/0x110
[ 163.418252] ? report_bug+0x171/0x1a0
[ 163.418259] ? handle_bug+0x3c/0x80
[ 163.418264] ? exc_invalid_op+0x17/0x70
[ 163.418268] ? asm_exc_invalid_op+0x1a/0x20
[ 163.418275] ? refcount_warn_saturate+0x9b/0x110
[ 163.418279] drm_connector_list_iter_next+0x97/0xc0
[ 163.418289] drm_connector_register_all+0x3d/0xf0
[ 163.418296] drm_modeset_register_all+0x5f/0x80
[ 163.418302] drm_dev_register+0x114/0x240
[ 163.418307] nouveau_drm_probe+0x16a/0x280 [nouveau 7f21e95875a4a0137564007ae3277f6b641e9279]
[ 163.418713] local_pci_probe+0x45/0xa0
[ 163.418719] pci_device_probe+0xc7/0x230
[ 163.418726] really_probe+0x19e/0x3e0
[ 163.418730] ? __pfx___driver_attach+0x10/0x10
[ 163.418734] __driver_probe_device+0x78/0x160
[ 163.418737] driver_probe_device+0x1f/0x90
[ 163.418741] __driver_attach+0xd2/0x1c0
[ 163.418745] bus_for_each_dev+0x77/0xc0
[ 163.418751] bus_add_driver+0x116/0x220
[ 163.418757] driver_register+0x59/0x100
[ 163.418762] ? __pfx_nouveau_drm_init+0x10/0x10 [nouveau 7f21e95875a4a0137564007ae3277f6b641e9279]
[ 163.418999] do_one_initcall+0x4a/0x220
[ 163.418999] ? kmalloc_trace+0x2a/0xa0
[ 163.418999] do_init_module+0x60/0x240
[ 163.418999] __do_sys_init_module+0x17f/0x1b0
[ 163.418999] do_syscall_64+0x60/0x90
[ 163.418999] ? syscall_exit_to_user_mode+0x1b/0x40
[ 163.418999] ? do_syscall_64+0x6c/0x90
[ 163.418999] ? count_memcg_events.constprop.0+0x1a/0x30
[ 163.418999] ? handle_mm_fault+0x9e/0x350
[ 163.418999] ? do_user_addr_fault+0x179/0x640
[ 163.418999] ? exc_page_fault+0x71/0x160
[ 163.418999] entry_SYSCALL_64_after_hwframe+0x72/0xdc
[ 163.418999] RIP: 0033:0x7f81bfb19a5e
[ 163.418999] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 ca b8 af 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7a 03 0d 00 f7 d8 64 89 01 48
[ 163.418999] RSP: 002b:00007ffddb1760c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000af
[ 163.418999] RAX: ffffffffffffffda RBX: 0000560bc842df00 RCX: 00007f81bfb19a5e
[ 163.418999] RDX: 0000560bc8432900 RSI: 00000000006aef9b RDI: 00007f81bea94010
[ 163.418999] RBP: 0000560bc8432900 R08: 0000560bc8432c20 R09: 0000000000000000
[ 163.418999] R10: 0000000000012b71 R11: 0000000000000246 R12: 0000000000040000
[ 163.418999] R13: 0000000000000000 R14: 0000000000000009 R15: 0000560bc842d7b0
[ 163.418999] </TASK>
[ 163.418999] ---[ end trace 0000000000000000 ]---

The full dmesg is found in
https://bugzilla.suse.com/attachment.cgi?id=868688


thanks,

Takashi