id summary reporter owner description type status component version resolution keywords cc guest host 8825 Virtual machines hang if PAE enabled Tom Francart "After an upgrade from Virtualbox 3.2 to 4.0.6, Windows guests hung shortly after starting up. This happened both for Windows 7 (at the point where the moving windows startup logo should have appeared) and for Windows XP (after showing the desktop). This problem went away when I disabled ""Enable PAE/NX"" Host is Ubuntu Natty (all packages up to date on 2 May, kernel 2.6.38-8-generic-pae) {{{ The following error message was shown in the system logs: [ 3897.461643] BUG: unable to handle kernel NULL pointer dereference at (null) [ 3897.461651] IP: [] 0xf8ca4303 [ 3897.461657] *pdpt = 0000000026fc6001 *pde = 0000000000000000 [ 3897.461659] Oops: 0000 [#3] SMP [ 3897.461661] last sysfs file: /sys/devices/virtual/net/vboxnet0/statistics/collisions [ 3897.461664] Modules linked in: vboxnetadp vboxnetflt vboxdrv hidp aesni_intel cryptd aes_i586 aes_generic binfmt_misc rfcomm sco bnep l2cap dm_crypt vesafb nvidia(P) snd_hda_codec_hdmi arc4 snd_hda_codec_idt snd_hda_intel iwlagn snd_hda_codec snd_hwdep snd_pcm iwlcore pcmcia snd_seq_midi mac80211 dell_wmi ppdev sparse_keymap snd_rawmidi snd_seq_midi_event snd_seq dell_laptop usbhid dcdbas btusb uvcvideo bluetooth snd_timer hid snd_seq_device videodev yenta_socket pcmcia_rsrc pcmcia_core cfg80211 psmouse snd parport_pc serio_raw intel_ips soundcore snd_page_alloc lp parport ahci firewire_ohci libahci e1000e video firewire_core crc_itu_t sdhci_pci sdhci [ 3897.461691] [ 3897.461693] Pid: 7755, comm: VirtualBox Tainted: P D 2.6.38-8-generic-pae #42-Ubuntu Dell Inc. Latitude E6510/0N5KHN [ 3897.461697] EIP: 0060:[] EFLAGS: 00010246 CPU: 1 [ 3897.461700] EIP is at 0xf8ca4303 [ 3897.461701] EAX: 00000000 EBX: e0afbdec ECX: c0103124 EDX: 00000000 [ 3897.461702] ESI: 00000001 EDI: 0000280a EBP: e0afbdcc ESP: e0afbda4 [ 3897.461703] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 3897.461705] Process VirtualBox (pid: 7755, ti=e0afa000 task=e6f98000 task.ti=e0afa000) [ 3897.461706] Stack: [ 3897.461707] fa6ba000 e0afbdc0 e0afbe0c f8cbe327 fa69f000 e0afbdec ffffffff 00000000 [ 3897.461711] 00000004 fa6ba000 e0afbe0c f8c7cbc6 e0afbdec fa6ba000 00000000 00000000 [ 3897.461714] e0afbe24 c1042325 00a09c4e 00000000 00989680 e7b99900 00000000 00327000 [ 3897.461718] Call Trace: [ 3897.461730] [] ? update_cfs_load+0x135/0x290 [ 3897.461736] [] ? enqueue_entity+0x18f/0x2c0 [ 3897.461743] [] ? check_preempt_curr+0x65/0x90 [ 3897.461746] [] ? try_to_wake_up+0x223/0x3c0 [ 3897.461761] [] ? supdrvIOCtlFast+0x99/0xb0 [vboxdrv] [ 3897.461768] [] ? VBoxDrvLinuxIOCtl+0x41/0x1c0 [vboxdrv] [ 3897.461772] [] ? do_futex+0x7a/0x230 [ 3897.461778] [] ? VBoxDrvLinuxIOCtl+0x0/0x1c0 [vboxdrv] [ 3897.461782] [] ? do_vfs_ioctl+0x7b/0x2e0 [ 3897.461784] [] ? sys_ioctl+0x87/0x90 [ 3897.461787] [] ? sysenter_do_call+0x12/0x28 [ 3897.461788] Code: 00 74 a7 eb 9e 8d 76 00 55 89 e5 53 83 ec 24 8b 55 0c 8b 5d 08 8b 82 dc 36 00 00 85 c0 89 45 f4 74 1d 8b 55 10 83 e2 03 8d 14 d0 <8b> 02 8b 52 04 89 03 89 d8 89 53 04 83 c4 24 5b 5d c2 04 00 8d [ 3897.461808] EIP: [] 0xf8ca4303 SS:ESP 0068:e0afbda4 [ 3897.461812] CR2: 0000000000000000 [ 3897.461814] ---[ end trace 24309d039bef3ab4 ]--- }}} " defect closed other VirtualBox 4.0.6 duplicate Windows Linux