[Bug 32481] oops at boot (squashfs ??)

[Jerome Lacoste]

Public bug reported:
https://launchpad.net/malone/bugs/32481

Affects: linux-source-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
[4295026.313000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[4295026.313000]  printing eip:
[4295026.313000] 402e919f
[4295026.313000] *pde = 00000000
[4295026.313000] Oops: 0002 [#1]
[4295026.313000] PREEMPT
[4295026.313000] Modules linked in: dm_mod md_mod pcmcia snd_maestro3 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd yenta_socket rsrc_nonstatic pcmcia_core soundcore joydev tsdev nvidia rtc intel_agp parport_pc parport floppy pcspkr shpchp af_packet psmouse serio_raw agpgart pci_hotplug evdev e100 mii squashfs unionfs loop nls_cp437 isofs ohci1394 ieee1394 uhci_hcd usbcore ide_generic ide_cd cdrom ide_disk piix generic thermal processor fan capability commoncap vga16fb cfbcopyarea vgastate cfbimgblt cfbfillrect fbcon tileblit font bitblit softcursor
[4295026.313000] CPU:    0
[4295026.313000] EIP:    0060:[<402e919f>]    Tainted: P      VLI
[4295026.313000] EFLAGS: 00010002   (2.6.15-15-386)
[4295026.313000] EIP is at __down+0x5f/0x120
[4295026.313000] eax: 420c7cf0   ebx: 420c6000   ecx: 420c6000   edx: 00000000
[4295026.313000] esi: 4fbf0324   edi: 00000206   ebp: 4fbf032c   esp: 420c7ce0
[4295026.313000] ds: 007b   es: 007b   ss: 0068
[4295026.313000] Process readahead-list (pid: 4446, threadinfo=420c6000 task=420a9590)
[4295026.313000] Stack: 420a9590 00000001 420a9590 40118270 4fbf032c 00000000 420c6000 00093c24
[4295026.313000]        00000000 00000000 402e7b2f 420c6000 4fbf0240 509b8b7b 4fbf0324 4fbf034c
[4295026.313000]        4fbf0240 420c6000 4c884888 403e1ab4 420c6000 420c6000 4be5f094 4c884888
[4295026.313000] Call Trace:
[4295026.313000]  [<40118270>] default_wake_function+0x0/0x20
[4295026.313000]  [<402e7b2f>] __down_failed+0x7/0xc
[4295026.313000]  [<509b8b7b>] .text.lock.inode+0xaf/0x174 [squashfs]
[4295026.313000]  [<509b707f>] squashfs_readpage+0x13f/0x540 [squashfs]
[4295026.313000]  [<4017701d>] dput+0x10d/0x2c0
[4295026.313000]  [<4017c88c>] mntput_no_expire+0x1c/0x90
[4295026.313000]  [<4016e00b>] __link_path_walk+0xe2b/0xfd0
[4295026.313000]  [<4017701d>] dput+0x10d/0x2c0
[4295026.313000]  [<4017c88c>] mntput_no_expire+0x1c/0x90
[4295026.313000]  [<509c3a8d>] inode_permission+0x11d/0x1d0 [unionfs]
[4295026.313000]  [<401d9f75>] radix_tree_node_alloc+0x15/0x60
[4295026.313000]  [<401da23f>] radix_tree_insert+0xff/0x140
[4295026.313000]  [<4013edd6>] add_to_page_cache+0x46/0xb0
[4295026.313000]  [<401464ec>] read_pages+0xac/0x130
[4295026.313000]  [<40143c4e>] __alloc_pages+0x4e/0x2e0
[4295026.313000]  [<401466e1>] __do_page_cache_readahead+0x171/0x1d0
[4295026.313000]  [<40146783>] force_page_cache_readahead+0x43/0xa0
[4295026.313000]  [<4013fe69>] do_readahead+0x39/0x40
[4295026.313000]  [<4013fee6>] sys_readahead+0x76/0x90
[4295026.313000]  [<4010302b>] sysenter_past_esp+0x54/0x79
[4295026.313000] Code: 0c 70 82 11 40 c7 02 02 00 00 00 9c 5f fa ff 40 14 8d 6e 08 83 4c 24 04 01 8b 55 04 8d 44 24 10 89 45 04 89 6c 24 10 89 54 24 14 <89> 02 8b 46 04 8d 50 01 89 56 04 01 06 0f 98 c0 84 c0 75 7e c7
[4295026.313000]  <6>note: readahead-list[4446] exited with preempt_count 1