Hi,

in today's -next I see: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff810e3990>] pagevec_move_tail+0x30/0x30 PGD 1bf4fc067 PUD 1bf4f0067 PMD 0 Oops: 0000 [#1] SMP CPU 0 Modules linked in: pl2303 usbserial microcode

Pid: 4260, comm: X Not tainted 3.4.0-rc2-next-20120410_64+ #1683 To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M. RIP: 0010:[<ffffffff810e3990>] [<ffffffff810e3990>] pagevec_move_tail+0x30/0x30 RSP: 0018:ffff8801bf7f1ca0 EFLAGS: 00010202 RAX: ffff8801c1502b60 RBX: 0000000000000008 RCX: ffff8801c286a000 RDX: 0000000000000000 RSI: 0000000000000819 RDI: 0000000000000000 RBP: ffff8801bf7f1cc8 R08: 0000000000000001 R09: ffff8801bf7f1fd8 R10: ffff8801bf7f1fd8 R11: ffff880000000000 R12: ffff8801bf6cbe00 R13: 0000000000000008 R14: ffff8801bfdf6138 R15: ffff8801c2def000 FS: 00007fd1d3d9f880(0000) GS:ffff8801cbc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001bff5b000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process X (pid: 4260, threadinfo ffff8801bf7f0000, task ffff8801c28ea640) Stack: ffffffff81345290 ffff8801bf7f1cc8 ffff8801bf6cbe00 0000000000000000 ffff8801c286a000 ffff8801bf7f1cf8 ffffffff813486fd ffff8801bf7f1cf8 ffff8801bf6cbe00 ffff8801c286a000 000000000000000a ffff8801bf7f1d18 Call Trace: [<ffffffff81345290>] ? i915_gem_object_put_pages_gtt+0x90/0x180 [<ffffffff813486fd>] i915_gem_object_unbind+0xad/0x1e0 [<ffffffff8134884a>] i915_gem_free_object_tail+0x1a/0xd0 [<ffffffff8134b391>] i915_gem_free_object+0x51/0x60 [<ffffffff8131faa5>] drm_gem_object_free+0x25/0x40 [<ffffffff81320120>] drm_gem_handle_delete+0xf0/0x120 [<ffffffff813203a3>] drm_gem_close_ioctl+0x23/0x30 [<ffffffff8131e20c>] drm_ioctl+0x43c/0x510 [<ffffffff81086472>] ? enqueue_hrtimer+0x22/0x50 [<ffffffff81320380>] ? drm_gem_destroy+0x50/0x50 [<ffffffff81086e9f>] ? hrtimer_start_range_ns+0xf/0x20 [<ffffffff811325d7>] do_vfs_ioctl+0x97/0x580 [<ffffffff81121ead>] ? vfs_read+0xfd/0x180 [<ffffffff81132b0a>] sys_ioctl+0x4a/0x80 [<ffffffff816359e2>] system_call_fastpath+0x16/0x1b Code: 32 0e 81 48 89 e5 48 83 ec 10 48 8d 55 fc c7 45 fc 00 00 00 00 e8 e1 fe ff ff 48 63 45 fc 65 48 01 04 25 b0 e3 00 00 c9 c3 66 90 <48> f7 07 00 c 0f RIP [<ffffffff810e3990>] pagevec_move_tail+0x30/0x30 RSP <ffff8801bf7f1ca0> CR2: 0000000000000000

This is G33: 00:02.0 VGA compatible controller [0300]: Intel Corporation 82G33/G31 Express Integrated Graphics Controller [8086:29c2] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Intel Corporation 82G33/G31 Express Integrated Graphics Controller [8086:29c2] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 42 Region 0: Memory at feb80000 (32-bit, non-prefetchable) [size=512K] Region 1: I/O ports at ec00 [size=8] Region 2: Memory at d0000000 (32-bit, prefetchable) [size=256M] Region 3: Memory at fea00000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Address: fee0300c Data: 4179 Capabilities: [d0] Power Management version 2 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: i915 00: 86 80 c2 29 07 04 90 00 02 00 00 03 00 00 00 00 10: 00 00 b8 fe 01 ec 00 00 08 00 00 d0 00 00 a0 fe 20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 c2 29 30: 00 00 00 00 90 00 00 00 00 00 00 00 05 01 00 00 40: 09 00 0b 01 00 00 00 00 01 00 00 00 00 00 00 00 50: 00 00 30 02 c9 03 00 00 00 00 00 00 00 00 80 af 60: 00 00 02 02 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 05 d0 01 00 0c 30 e0 fe 79 41 00 00 00 00 00 00 a0: 11 11 00 00 00 00 06 03 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 01 00 22 00 00 00 00 00 00 00 00 00 00 01 02 00 e0: 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 f0: 10 00 00 00 00 00 00 00 90 0f 03 00 e4 e0 5b af

thanks,