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