When formalising a reproducer for another noveau bug, simply switching between integrated and discrete GPUs a few times reproduces an oops in 3.8-rc1 [1,2].
Let me know if it helps to log it into bugs.freedesktop.org.
Thanks and Happy New Year! Daniel
--- [1]
while :; do bash -c "echo IGD
/sys/kernel/debug/vgaswitcheroo/switch"; bash -c "echo DIS /sys/kernel/debug/vgaswitcheroo/switch"; done
--- [2]
... VGA switcheroo: switched nouveau off nouveau [ DRM] suspending fbcon... nouveau [ DRM] suspending display... nouveau [ DRM] unpinning framebuffer(s)... nouveau [ DRM] evicting buffers... nouveau [ DRM] suspending client object trees... nouveau E[ PDISP][0000:01:00.0][0xc000917e][ffff8802647d8300] fini: 0xc0080088 nouveau E[ PDISP][0000:01:00.0][0xc000917e][ffff8802647d8300] failed suspend, -16 nouveau E[ DRM] 0xd1500000:0xd15c7e00 suspend failed with -16 nouveau E[ DRM] 0xdddddddd:0xd1500000 suspend failed with -16 nouveau E[ DRM] 0xffffffff:0xdddddddd suspend failed with -16 nouveau E[ DRM] 0xffffffff:0xffffffff suspend failed with -16 nouveau [ DRM] resuming display... VGA switcheroo: switched nouveau on nouveau [ DRM] re-enabling device... nouveau [ DRM] resuming client object trees... nouveau [ DRM] resuming display... BUG: unable to handle kernel paging request at ffff880364785ffc IP: [<ffffffffa01012b6>] evo_wait+0x46/0xa0 [nouveau] PGD 180d063 PUD 0 Oops: 0002 [#1] SMP Modules linked in: snd_hda_codec_hdmi joydev hid_apple bcm5974 coretemp kvm_intel kvm rfcomm ghash_clmulni_intel bnep b43 ssb uvcvideo smsc75xx usbnet snd_hda_codec_cirrus mii videobuf2_core i915 videobuf2_vmalloc videobuf2_memops applesmc input_polldev snd_hda_intel snd_hda_codec microcode bcma snd_hwdep lpc_ich mfd_core snd_pcm nouveau apple_gmux snd_timer ttm drm_kms_helper snd hwmon mxm_wmi snd_page_alloc apple_bl video nls_iso8859_1 CPU 5 Pid: 1627, comm: bash Not tainted 3.8.0-rc1-expert+ #55 Apple Inc. MacBookPro10,1/Mac-C3EC7CD22292981F RIP: 0010:[<ffffffffa01012b6>] [<ffffffffa01012b6>] evo_wait+0x46/0xa0 [nouveau] RSP: 0018:ffff88025eec1d38 EFLAGS: 00010246 RAX: 000000003fffffff RBX: ffff880264700708 RCX: ffff880263c03d20 RDX: ffff880264786000 RSI: 0000000000000000 RDI: ffffc9000c840000 RBP: ffff88025eec1d48 R08: 0000000000008000 R09: 0000000000000000 R10: 0000000000008000 R11: ffffc9000f5ffff8 R12: 000000004000001f R13: ffff880264986800 R14: ffff880263c1f000 R15: 0000000000000000 FS: 00007f1b7fea5700(0000) GS:ffff88026f340000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff880364785ffc CR3: 000000025fa77000 CR4: 00000000001407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process bash (pid: 1627, threadinfo ffff88025eec0000, task ffff88025f834680) Stack: ffff880264986800 ffff880264986c38 ffff88025eec1d68 ffffffffa0101bab ffff88025eec1d88 ffff88025ec5f900 ffff88025eec1d98 ffffffffa00eb003 ffff880264986c30 ffff880264986c38 ffff880264986800 ffff880263c1f000 Call Trace: [<ffffffffa0101bab>] nv50_display_init+0x2b/0x90 [nouveau] [<ffffffffa00eb003>] nouveau_display_init+0x43/0x110 [nouveau] [<ffffffffa00eba36>] nouveau_display_resume+0xe6/0x180 [nouveau] [<ffffffffa00db856>] nouveau_do_resume+0x106/0x120 [nouveau] [<ffffffffa00db8f8>] nouveau_pmops_resume+0x68/0x80 [nouveau] [<ffffffffa00dd298>] nouveau_switcheroo_set_state+0x98/0xc0 [nouveau] [<ffffffff812c0684>] vga_switchon+0x34/0x50 [<ffffffff812c0b18>] vga_switchto_stage1+0x38/0x40 [<ffffffff812c0ebb>] vga_switcheroo_debugfs_write+0x22b/0x380 [<ffffffff8110bcb2>] ? __alloc_fd+0x42/0x110 [<ffffffff810ef511>] ? filp_close+0x61/0x90 [<ffffffff810f14f3>] vfs_write+0xa3/0x160 [<ffffffff810f17fd>] sys_write+0x4d/0xa0 [<ffffffff81028689>] ? do_page_fault+0x9/0x10 [<ffffffff814c9a96>] system_call_fastpath+0x1a/0x1f Code: 30 c1 e8 02 48 8d 14 85 00 00 00 00 41 01 c4 41 81 fc f7 03 00 00 77 0d 48 8b 43 18 48 01 d0 5b 41 5c 5d c3 90 48 8b 53 18 31 f6 <c7> 04 82 00 00 00 20 31 d2 48 8b 3b 48 8b 07 48 8b 40 08 ff 50 RIP [<ffffffffa01012b6>] evo_wait+0x46/0xa0 [nouveau] RSP <ffff88025eec1d38> CR2: ffff880364785ffc