Hi Andrea, I hit thg BUG 2 time during 5 booting. I applied khugepaged: fix pte_unmap for highpte x86_32 based on 2.6.38-rc1. === CUT_HERE == Jan 21 00:13:48 barrios-desktop kernel: [ 31.563110] mapcount 0 page_mapcount 1 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563137] ------------[ cut here ]------------ Jan 21 00:13:48 barrios-desktop kernel: [ 31.563158] kernel BUG at mm/huge_memory.c:1350! Jan 21 00:13:48 barrios-desktop kernel: [ 31.563166] invalid opcode: 0000 [#1] SMP Jan 21 00:13:48 barrios-desktop kernel: [ 31.563176] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/boot_vga Jan 21 00:13:48 barrios-desktop kernel: [ 31.563186] Modules linked in: binfmt_misc nfsd nouveau lockd snd_hda_codec_realtek snd_hda_intel snd_hda_codec nfs_acl kvm_intel auth_rpcgss fbcon snd_hwdep tileblit snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy sunrpc snd_seq_oss kvm ttm font bitblit snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq softcursor drm_kms_helper drm exportfs snd_timer snd_seq_device snd psmouse intel_agp ppdev serio_raw parport_pc intel_gtt lp parport soundcore snd_page_alloc agpgart i2c_algo_bit video joydev ahci usbhid hid sky2 libahci pata_jmicron Jan 21 00:13:48 barrios-desktop kernel: [ 31.563331] Jan 21 00:13:48 barrios-desktop kernel: [ 31.563337] Pid: 1135, comm: Xorg Not tainted 2.6.38-rc1+ #2 965P-DS3/965P-DS3 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563348] EIP: 0060:[] EFLAGS: 00013297 CPU: 0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563361] EIP is at split_huge_page+0x63d/0x6f0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563368] EAX: 00000001 EBX: f6dbd000 ECX: c07aa974 EDX: f6dbd000 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563376] ESI: eed17b9c EDI: b3800000 EBP: ee5c9c28 ESP: ee5c9bc8 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563384] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563393] Process Xorg (pid: 1135, ti=ee5c8000 task=ee59a5e0 task.ti=ee5c8000) Jan 21 00:13:48 barrios-desktop kernel: [ 31.563401] Stack: Jan 21 00:13:48 barrios-desktop kernel: [ 31.563405] c0712ec4 00000000 00000001 c01f590f eef9a4b0 f3ab9c00 eed17ba0 ee5c9c38 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563427] c01f6a1d eed17bac ee5c9c40 00000000 00000100 f6dbd000 f6dbd008 00000001 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563448] eed17bac 00000000 00000000 f3ab9c44 c01fd826 f6dbd000 00000001 00000001 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563469] Call Trace: Jan 21 00:13:48 barrios-desktop kernel: [ 31.563479] [] ? __page_lock_anon_vma+0x4f/0x70 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563488] [] ? page_referenced+0x22d/0x300 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563497] [] ? get_swap_page+0xc6/0xe0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563507] [] add_to_swap+0x52/0x70 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563516] [] shrink_page_list+0x37f/0x760 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563525] [] ? update_isolated_counts+0x14d/0x180 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563534] [] shrink_inactive_list+0x13b/0x3c0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563543] [] shrink_zone+0x32b/0x560 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563554] [] ? _raw_spin_lock+0xd/0x10 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563562] [] do_try_to_free_pages+0x82/0x410 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563571] [] try_to_free_pages+0x81/0xf0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563581] [] __alloc_pages_nodemask+0x365/0x700 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563590] [] ? anon_vma_prepare+0x1e/0x140 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563598] [] do_huge_pmd_anonymous_page+0x10b/0x310 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563609] [] ? __free_pages+0x35/0x40 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563617] [] handle_mm_fault+0x17b/0x200 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563627] [] do_page_fault+0x111/0x450 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563635] [] ? sys_mmap_pgoff+0x79/0x1e0 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563644] [] ? do_page_fault+0x0/0x450 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563653] [] error_code+0x67/0x70 Jan 21 00:13:48 barrios-desktop kernel: [ 31.563659] Code: fe 0f 0b eb fe 0f 0b eb fe 8b 43 08 c7 04 24 c4 2e 71 c0 83 c0 01 89 44 24 08 8b 45 cc 89 44 24 04 e8 86 f6 3a 00 e9 2e fb ff ff <0f> 0b eb fe 8b 10 81 e2 00 00 00 01 0f 84 57 fb ff ff f3 90 eb Jan 21 00:13:48 barrios-desktop kernel: [ 31.563785] EIP: [] split_huge_page+0x63d/0x6f0 SS:ESP 0068:ee5c9bc8 J -- Kind regards, Minchan Kim