The 2.6.9-22.ELsmp kernel crashes on X11 exit when using the i915 driver to drive this Intel 915G video chip. The 2.6.9-22.EL (non-smp) kernel, and 2.6.9-11.EL (both UP and SMP) do not exhibit the problem. Oct 6 11:25:38 nathan kernel: [drm] Initialized i915 1.1.0 20040405 on minor 0: Oct 6 11:25:38 nathan kernel: mtrr: base(0xe0020000) is not aligned on a size(0x800000) boundary Oct 6 11:25:39 nathan kernel: ------------[ cut here ]------------ Oct 6 11:25:39 nathan kernel: kernel BUG at arch/i386/mm/pageattr.c:155! Oct 6 11:25:39 nathan kernel: invalid operand: 0000 [#1] Oct 6 11:25:39 nathan kernel: SMP Oct 6 11:25:39 nathan kernel: Modules linked in: i915 parport_pc lp parport autofs4 i2c_dev i2c_core nfs lockd sunrpc dm_mirror dm_mod button battery ac md5 ipv6 joydev uhci_hcd ehci_hcd snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore tg3 floppy ext3 jbd ata_piix libata sd_mod scsi_mod Oct 6 11:25:39 nathan kernel: CPU: 0 Oct 6 11:25:39 nathan kernel: EIP: 0060:[<c011bbd1>] Not tainted VLI Oct 6 11:25:39 nathan kernel: EFLAGS: 00210002 (2.6.9-22.ELsmp) Oct 6 11:25:39 nathan kernel: EIP is at __change_page_attr+0x332/0x400 Oct 6 11:25:39 nathan kernel: eax: 00000080 ebx: 00000080 ecx: 00000000 edx: 00000000 Oct 6 11:25:39 nathan kernel: esi: 00000163 edi: 80000000 ebp: c0007d88 esp: c1b08db0 Oct 6 11:25:39 nathan kernel: ds: 007b es: 007b ss: 0068 Oct 6 11:25:39 nathan kernel: Process X (pid: 1824, threadinfo=c1b08000 task=f6a607b0) Oct 6 11:25:39 nathan kernel: Stack: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Oct 6 11:25:39 nathan kernel: 00000000 00000000 c1000000 c10000e0 f63ff000 00000163 80000000 c16c7fe0 Oct 6 11:25:39 nathan kernel: 00000001 80000000 00000010 c1020000 c16c7fe0 00000000 00000000 00000001 Oct 6 11:25:39 nathan kernel: Call Trace: Oct 6 11:25:39 nathan kernel: [<c011bccc>] change_page_attr+0x2d/0x50 Oct 6 11:25:39 nathan kernel: [<c020d974>] unmap_page_from_agp+0x17/0x24 Oct 6 11:25:39 nathan kernel: [<c020e707>] agp_generic_destroy_page+0x21/0x44 Oct 6 11:25:39 nathan kernel: [<c020daa5>] agp_free_memory+0x62/0x82 Oct 6 11:25:39 nathan kernel: [<c020ccac>] agp_remove_all_memory+0x12/0x16 Oct 6 11:25:39 nathan kernel: [<c020ccde>] agp_remove_controller+0x2e/0x5e Oct 6 11:25:39 nathan kernel: [<c020d044>] agp_release+0x61/0x9e Oct 6 11:25:39 nathan kernel: [<c015a8fe>] __fput+0x55/0x100 Oct 6 11:25:39 nathan kernel: [<c0159545>] filp_close+0x59/0x5f Oct 6 11:25:39 nathan kernel: [<c01235cf>] put_files_struct+0x57/0xc0 Oct 6 11:25:39 nathan kernel: [<c01241e5>] do_exit+0x227/0x3de Oct 6 11:25:39 nathan kernel: [<c0124487>] sys_exit_group+0x0/0xd Oct 6 11:25:39 nathan kernel: [<c012c56b>] get_signal_to_deliver+0x350/0x378 Oct 6 11:25:39 nathan kernel: [<c0105ba4>] do_signal+0x55/0xd9 Oct 6 11:25:39 nathan kernel: [<c0169fc5>] __pollwait+0x0/0x95 Oct 6 11:25:39 nathan kernel: [<c016a808>] sys_select+0x430/0x43a Oct 6 11:25:39 nathan kernel: [<c0105c50>] do_notify_resume+0x28/0x38 Oct 6 11:25:39 nathan kernel: [<c02d111a>] work_notifysig+0x13/0x15 Oct 6 11:25:39 nathan kernel: Code: 89 f0 09 da 89 54 24 44 09 c8 8b 4c 24 44 89 44 24 40 8b 5c 24 40 8b 07 8b 57 04 f0 0f c7 0f 75 f5 8b 44 24 2c f0 ff 48 04 eb 08 <0f> 0b 9b 00 d5 26 2e c0 a1 8c 04 32 c0 a8 08 0f 84 af 00 00 00 Oct 6 11:25:39 nathan kernel: <0>Fatal exception: panic in 5 seconds