Bug 46331

I have run r600 piglit tests and the OOPS error screen showed up with this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
IP: [<ffffffffa01762f4>] radeon_ttm_bo_destroy+0x34/0xd0 [radeon]
PGD 108522067 PUD 123182067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP 
Modules linked in: asus_atk0110 usb_storage snd_hda_codec_hdmi radeon snd_hda_codec_realtek i2c_algo_bit snd_hda_intel snd_hda_codec snd_pcm coretemp aesni_intel aes_x86_64 r8169 hwmon drm_kms_helper ttm drm aes_generic xhci_hcd i2c_i801 mii ablk_helper cryptd video snd_page_alloc snd_timer snd ehci_hcd wmi
CPU 0 
Pid: 14945, comm: max-texture-siz Not tainted 3.6.0-rc2-00124-g6dab7ed #1 System manufacturer System Product Name/P8H67
RIP: 0010:[<ffffffffa01762f4>]  [<ffffffffa01762f4>] radeon_ttm_bo_destroy+0x34/0xd0 [radeon]
RSP: 0018:ffff8800d9fbfb18  EFLAGS: 00010282
RAX: ffff8802059c6800 RBX: ffff8802059c6848 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8802147f6ed8
RBP: ffff8802059c6800 R08: 0000000000000000 R09: ffff88021ec13f40
R10: ffffea00035a0540 R11: ffffffffa00bab18 R12: ffff8802147f6580
R13: ffff8802059c6848 R14: ffff8802059c6848 R15: ffff8802059c6888
FS:  00007f7fcdf95740(0000) GS:ffff88021ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 00000000d6db1000 CR4: 00000000000407f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process max-texture-siz (pid: 14945, threadinfo ffff8800d9fbe000, task ffff880215376600)
Stack:
 ffff8802059c688c 0000000000400480 ffff8802147f6580 ffffffffa007481d
 0000000000000001 0000000000000001 ffff8802147f65a0 ffff8802147f69a8
 ffff8802133f11f8 ffffffffa00758a4 0000000000000296 0000000000000003
Call Trace:
 [<ffffffffa007481d>] ? ttm_bo_release_list+0xad/0x100 [ttm]
 [<ffffffffa00758a4>] ? ttm_bo_release+0x194/0x230 [ttm]
 [<ffffffffa007597d>] ? ttm_bo_unref+0x3d/0x60 [ttm]
 [<ffffffffa007751c>] ? ttm_bo_init+0x2ac/0x3f0 [ttm]
 [<ffffffffa0176614>] ? radeon_bo_create+0x1f4/0x300 [radeon]
 [<ffffffffa01762c0>] ? radeon_bo_clear_va+0x50/0x50 [radeon]
 [<ffffffffa0187df4>] ? radeon_gem_object_create+0x64/0x110 [radeon]
 [<ffffffffa018816c>] ? radeon_gem_create_ioctl+0x6c/0x120 [radeon]
 [<ffffffffa00b011c>] ? drm_ioctl+0x40c/0x4c0 [drm]
 [<ffffffffa0188100>] ? radeon_gem_pwrite_ioctl+0x30/0x30 [radeon]
 [<ffffffff81028362>] ? do_page_fault+0x182/0x440
 [<ffffffff8110460f>] ? do_vfs_ioctl+0x8f/0x530
 [<ffffffff810be483>] ? vm_mmap_pgoff+0x73/0xa0
 [<ffffffff81104af9>] ? sys_ioctl+0x49/0x80
 [<ffffffff81473be2>] ? system_call_fastpath+0x16/0x1b
Code: 89 fb 48 89 6c 24 08 48 8d 6f b8 4c 89 64 24 10 48 8b bf c8 01 00 00 48 81 c7 d8 0e 00 00 e8 b4 aa 2f e1 48 8b 53 b8 48 8b 43 c0 <48> 89 42 08 48 89 10 48 8b bb c8 01 00 00 48 89 6b b8 48 89 6b 
RIP  [<ffffffffa01762f4>] radeon_ttm_bo_destroy+0x34/0xd0 [radeon]
 RSP <ffff8800d9fbfb18>
CR2: 0000000000000008
---[ end trace 61e9627de8e05172 ]---

The card is Radeon HD 5750, I'm using Mesa from git (8d1a9a9), libdrm is also from git.