https://bugs.freedesktop.org/show_bug.cgi?id=31052

Summary: drm radeon modesetting enabled hits Linux kernel BUG null pointer Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: critical Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: bitbytebit@gmail.com

I am using Linux 2.6.36 and a Radeon HD2600 PCIe card, has an RV630 GPU and is an ArcadeVGA card actually which has an altered BIOS to support Arcade Monitors. They are sold by a guy in the UK at the ultimarc.com website, that is where I bought it. I can load the normal radeon drm kernel module without modesetting, but with it I hit a bug in the kernel. I had to comment out the check for the ATI signature, which then it goes past that fine and detects the Atom bios information. Then in the TTM initialization of the memory it hits a null pointer. Here is the log below, I'm wondering what I should try to do to fix this and get this card working correctly with the radeon drm stuff for modesetting.

Thanks, Chris

01:00.0 VGA compatible controller: ATI Technologies Inc Device 958f (prog-if 00 [VGA controller]) Subsystem: ATI Technologies Inc Device 0502 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at d0000000 (64-bit, prefetchable) [size=256M] Memory at e0a00000 (64-bit, non-prefetchable) [size=64K] I/O ports at 1000 [size=256] [virtual] Expansion ROM at e0000000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information <?> Kernel driver in use: radeon

in atom.c I commented this out since it's not an official ATI atom bios version:

/*if (strncmp (CSTR(ATOM_ATI_MAGIC_PTR), ATOM_ATI_MAGIC, strlen(ATOM_ATI_MAGIC))) { printk(KERN_INFO "Invalid ATI magic.\n"); kfree(ctx); return NULL; }*/

[drm] Initialized drm 1.1.0 20060810 [drm] radeon kernel modesetting enabled. radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 radeon 0000:01:00.0: setting latency timer to 64 [drm] initializing kernel modesetting (RV630 0x1002:0x958F). [drm] register mmio base: 0xE0A00000 [drm] register mmio size: 65536 ATOM BIOS: 102 radeon 0000:01:00.0: VRAM: 512M 0x00000000 - 0x1FFFFFFF (512M used) radeon 0000:01:00.0: GTT: 512M 0x20000000 - 0x3FFFFFFF [drm] Detected VRAM RAM=512M, BAR=256M [drm] RAM width 128bits DDR [TTM] Zone kernel: Available graphics memory: 512964 kiB. [TTM] Initializing pool allocator. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffffa0a5d101>] ttm_bo_init_mm+0x81/0x120 [ttm] PGD 3f9d9067 PUD 3ef0d067 PMD 0 Oops: 0000 [#1] PREEMPT SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/block/sda/size CPU 0 Modules linked in: radeon(+) ttm drm_kms_helper drm agpgart hwmon i2c_algo_bit ipv6 nfsd snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ath9k mac80211 ath9k_common snd_hda_codec_atihdmi ath9k_hw snd_hda_codec_realtek ath snd_hda_intel snd_hda_codec cfg80211 rfkill snd_pcm hid_logitech rtc_cmos snd_timer led_class floppy rtc_core rtc_lib snd pcspkr soundcore snd_page_alloc tg3 libphy e1000 nfs lockd sunrpc jfs raid10 raid456 async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 dm_snapshot dm_crypt dm_mirror dm_region_hash dm_log dm_mod scsi_wait_scan sl811_hcd usbhid ohci_hcd uhci_hcd usb_storage ehci_hcd usbcore aic94xx libsas lpfc qla2xxx megaraid_sas megaraid_mbox megaraid_mm megaraid aacraid sx8 DAC960 cciss 3w_9xxx 3w_xxxx mptsas scsi_transport_sas mptfc scsi_transport_fc mptspi mptscsih mptbase atp870u dc395x qla1280 dmx3191d sym53c8xx gdth advansys initio BusLogic arcmsr aic7xxx aic79xx scsi_transport_spi sg pdc_adma sata_mv ahci libahci sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via sata_svw sata_sil24 sata_sil sata_promise pata_sis

Pid: 11692, comm: modprobe Not tainted 2.6.36 #1 0A68h/HP xw4400 Workstation RIP: 0010:[<ffffffffa0a5d101>] [<ffffffffa0a5d101>] ttm_bo_init_mm+0x81/0x120 [ttm] RSP: 0018:ffff88003da67b68 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff88003eed8510 RCX: ffff88003d8691d0 RDX: 0000000000000000 RSI: 0000000000020000 RDI: ffff88003eed85c8 RBP: ffff88003da67ba8 R08: 0000000000000000 R09: ffff88003d8691c0 R10: 0000000000000000 R11: dead000000200200 R12: 0000000000000002 R13: 0000000000000002 R14: ffff88003eed85a0 R15: ffff88003eed85c8 FS: 00007fd7b2a50700(0000) GS:ffff880001600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000000 CR3: 000000003da64000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process modprobe (pid: 11692, threadinfo ffff88003da66000, task ffff88003fa88310) Stack: ffff880000000000 0000000000020000 000000000041001d ffff88003eed8000 <0> ffff88003eed8510 00000000fffffff4 000000000041001d 0000000000000000 <0> ffff88003da67be8 ffffffffa0aa1786 ffff88003da67be8 ffff88003eed8000 Call Trace: [<ffffffffa0aa1786>] radeon_ttm_init+0x116/0x440 [radeon] [<ffffffffa0aa243e>] radeon_bo_init+0x7e/0x90 [radeon] [<ffffffffa0ae77fd>] r600_init+0xfd/0x2f0 [radeon] [<ffffffffa0a8b4c2>] radeon_device_init+0x332/0x490 [radeon] [<ffffffffa0a8cd32>] radeon_driver_load_kms+0xa2/0x180 [radeon] [<ffffffffa0a1ffb0>] drm_get_pci_dev+0x180/0x2a0 [drm] [<ffffffffa0b1480e>] radeon_pci_probe+0x10/0x271 [radeon] [<ffffffff8122b132>] local_pci_probe+0x12/0x20 [<ffffffff8122bac0>] pci_device_probe+0x80/0xb0 [<ffffffff812a6dfa>] ? driver_sysfs_add+0x7a/0xb0 [<ffffffff812a6f3d>] driver_probe_device+0x8d/0x1a0 [<ffffffff812a7050>] ? __driver_attach+0x0/0xa0 [<ffffffff812a70e3>] __driver_attach+0x93/0xa0 [<ffffffff812a7050>] ? __driver_attach+0x0/0xa0 [<ffffffff812a6648>] bus_for_each_dev+0x68/0x90 [<ffffffff812a6d79>] driver_attach+0x19/0x20 [<ffffffff812a5f28>] bus_add_driver+0x1d8/0x270 [<ffffffffa0b4b000>] ? radeon_init+0x0/0xc1 [radeon] [<ffffffff812a73d8>] driver_register+0x78/0x140 [<ffffffffa0b4b000>] ? radeon_init+0x0/0xc1 [radeon] [<ffffffff8122bd71>] __pci_register_driver+0x51/0xd0 [<ffffffffa0b4b000>] ? radeon_init+0x0/0xc1 [radeon] [<ffffffffa0a2019f>] drm_pci_init+0xcf/0xe0 [drm] [<ffffffffa0b4b000>] ? radeon_init+0x0/0xc1 [radeon] [<ffffffffa0a18953>] drm_init+0x53/0x70 [drm] [<ffffffffa0b4b0bf>] radeon_init+0xbf/0xc1 [radeon] [<ffffffff810001de>] do_one_initcall+0x3e/0x170 [<ffffffff8106a912>] sys_init_module+0xb2/0x200 [<ffffffff810023ab>] system_call_fastpath+0x16/0x1b Code: ff 50 10 89 c2 85 c0 75 59 49 89 5e 28 45 85 e4 74 22 48 83 7d c8 00 0f 84 8b 00 00 00 49 8b 46 50 48 8b 75 c8 89 55 c0 4c 89 ff <ff> 10 8b 55 c0 85 c0 75 46 4b 8d 4c ed 00 48 c1 e1 03 48 8d 04 RIP [<ffffffffa0a5d101>] ttm_bo_init_mm+0x81/0x120 [ttm] RSP <ffff88003da67b68> CR2: 0000000000000000 ---[ end trace 78952605cbb224d5 ]---