Linux guest shared folder traps

Maybe this is too much information by now, but here's the first oopses from another boot. Notice the sf_ functions at the top (or is that bottom?) of the stack?

[  396.744555] Oops: 0000 [#1] SMP 
[  396.745806] Modules linked in: vboxdrv ppdev autofs4 cpufreq_userspace cpufreq_powersave cpufreq_ondemand cpufreq_conservative cpufreq_stats freq_table sbs video output dock container sbshc iptable_filter ip_tables x_tables ipv6 deflate zlib_deflate twofish twofish_common camellia serpent blowfish des_generic cbc ecb aes_generic geode_aes blkcipher aes_i586 xcbc sha256_generic sha1_generic crypto_null af_key vboxvfs uinput sbp2 ieee1394 lp af_packet parport_pc parport evdev psmouse serio_raw pcspkr battery ac i2c_piix4 button vboxadd i2c_core dm_multipath ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_generic pata_acpi floppy ata_piix pcnet32 mii libata scsi_mod raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear md_mod dm_mirror dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit softcursor fuse
[  396.787536] 
[  396.788434] Pid: 5799, comm: hald-runner Not tainted (2.6.24-18-generic #1)
[  396.790881] EIP: 0060:[<c018e9c4>] EFLAGS: 00010002 CPU: 0
[  396.793048] EIP is at __kmalloc+0x64/0x110
[  396.794666] EAX: 00000000 EBX: 00140015 ECX: c04191d0 EDX: d0e24a00
[  396.796939] ESI: 00000286 EDI: c04191d0 EBP: c1206530 ESP: cd997d14
[  396.802071]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  396.804006] Process hald-runner (pid: 5799, ti=cd996000 task=ce155140 task.ti=cd996000)
[  396.806633] Stack: ce55d010 cedfde58 000000d0 cefeb308 00000003 00000011 ce55d020 d0e24a00 
[  396.811066]        cd997d38 ffffffff ffffffff d0e27a66 ce55d010 00000000 d0e2bba0 ceeab930 
[  396.815558]        cf850120 ce55d020 d0e25086 0000000c cd997e0c ce55d020 cf850120 d0e27a66 
[  396.820534] Call Trace:
[  396.825592]  [<d0e24a00>] sf_make_path+0x60/0x150 [vboxvfs]
[  396.828716]  [<d0e25086>] sf_path_from_dentry+0x136/0x150 [vboxvfs]
[  396.832214]  [<d0e238ac>] sf_lookup+0x4c/0x180 [vboxvfs]
[  396.835209]  [<c01a3dc4>] d_alloc+0x114/0x1a0
[  396.837977]  [<c01993d2>] do_lookup+0x122/0x1a0
[  396.840748]  [<c019b33d>] __link_path_walk+0x6fd/0xe10
[  396.843763]  [<c010879d>] enable_8259A_irq+0xd/0x50
[  396.849217]  [<c016a076>] handle_level_irq+0xb6/0xf0
[  396.852324]  [<c019ba95>] link_path_walk+0x45/0xc0
[  396.855047]  [<c0104266>] sys_sigreturn+0x106/0x180
[  396.857942]  [<c0146034>] do_gettimeofday+0x34/0xe0
[  396.860855]  [<c019bce7>] do_path_lookup+0x77/0x200
[  396.863660]  [<c019aa3a>] getname+0xaa/0xe0
[  396.866172]  [<c019c74b>] __user_walk_fd+0x3b/0x60
[  396.871634]  [<c0190607>] sys_faccessat+0x97/0x160
[  396.874600]  [<c0104266>] sys_sigreturn+0x106/0x180
[  396.877411]  [<c0146034>] do_gettimeofday+0x34/0xe0
[  396.880375]  [<c01906ef>] sys_access+0x1f/0x30
[  396.882659]  [<c01043c2>] sysenter_past_esp+0x6b/0xa9
[  396.884868]  =======================
[  396.886203] Code: 1f 84 00 00 00 00 00 89 c6 fa 0f 1f 84 00 00 00 00 00 90 64 a1 08 60 47 c0 8b 6c 87 70 8b 5d 00 85 db 0f 84 8a 00 00 00 8b 45 0c <8b> 04 83 89 45 00 89 f0 50 9d 0f 1f 84 00 00 00 00 00 66 83 7c 
[  396.905197] EIP: [<c018e9c4>] __kmalloc+0x64/0x110 SS:ESP 0068:cd997d14
[  396.908376] ---[ end trace 27e5b19da5630b59 ]---
[  397.031539] BUG: unable to handle kernel paging request at virtual address 00140015
[  397.036302] printing eip: c018e9c4 *pde = 00000000 
[  397.040437] Oops: 0000 [#2] SMP 
[  397.043877] Modules linked in: vboxdrv ppdev autofs4 cpufreq_userspace cpufreq_powersave cpufreq_ondemand cpufreq_conservative cpufreq_stats freq_table sbs video output dock container sbshc iptable_filter ip_tables x_tables ipv6 deflate zlib_deflate twofish twofish_common camellia serpent blowfish des_generic cbc ecb aes_generic geode_aes blkcipher aes_i586 xcbc sha256_generic sha1_generic crypto_null af_key vboxvfs uinput sbp2 ieee1394 lp af_packet parport_pc parport evdev psmouse serio_raw pcspkr battery ac i2c_piix4 button vboxadd i2c_core dm_multipath ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_generic pata_acpi floppy ata_piix pcnet32 mii libata scsi_mod raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear md_mod dm_mirror dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit softcursor fuse
[  397.096760] 
[  397.097657] Pid: 5832, comm: khelper Tainted: G      D (2.6.24-18-generic #1)
[  397.100231] EIP: 0060:[<c018e9c4>] EFLAGS: 00010002 CPU: 0
[  397.102326] EIP is at __kmalloc+0x64/0x110
[  397.107277] EAX: 00000000 EBX: 00140015 ECX: c04191d0 EDX: c01c227a
[  397.109766] ESI: 00000286 EDI: c04191d0 EBP: c1206530 ESP: cd881d94
[  397.112024]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[  397.114111] Process khelper (pid: 5832, ti=cd880000 task=cdf285c0 task.ti=cd880000)
[  397.116690] Stack: c018fca2 c0195ded 000000d0 cf2a8b20 cf2a8a00 00000000 ce9adc00 c01c227a 
[  397.121244]        000000e0 cd99c000 c012103d c10abfe0 cf2a8a00 c5600000 00000001 cd881f8c 
[  397.125778]        cf2a8b00 00000000 00000000 c03f5480 c55ff000 00000000 00000000 c03f5480 
[  397.133373] Call Trace:
[  397.135139]  [<c018fca2>] get_unused_fd_flags+0x52/0xd0
[  397.137272]  [<c0195ded>] kernel_read+0x3d/0x60
[  397.139630]  [<c01c227a>] load_elf_binary+0x183a/0x1cc0
[  397.141688]  [<c012103d>] kunmap_atomic+0x3d/0xb0
[  397.143759]  [<c01730d0>] __alloc_pages+0x60/0x3a0
[  397.145645]  [<c0181706>] find_mergeable_anon_vma+0x36/0xc0
[  397.149283]  [<c01838fc>] anon_vma_prepare+0x5c/0xe0
[  397.151219]  [<c012103d>] kunmap_atomic+0x3d/0xb0
[  397.156250]  [<c017dbf7>] handle_mm_fault+0x387/0x730
[  397.158229]  [<c01919d5>] do_sync_read+0xd5/0x120
[  397.160222]  [<c01a7e23>] mntput_no_expire+0x13/0x70
[  397.162252]  [<c012103d>] kunmap_atomic+0x3d/0xb0
[  397.164300]  [<c012103d>] kunmap_atomic+0x3d/0xb0
[  397.166269]  [<c017beea>] follow_page+0x10a/0x1b0
[  397.168371]  [<c017e079>] get_user_pages+0xd9/0x300
[  397.170432]  [<c019589b>] get_arg_page+0x4b/0xb0
[  397.172404]  [<c01c0a40>] load_elf_binary+0x0/0x1cc0
[  397.174390]  [<c0195b6a>] search_binary_handler+0x9a/0x1e0
[  397.179445]  [<c019776d>] do_execve+0x19d/0x1d0
[  397.181391]  [<c0102aef>] sys_execve+0x2f/0x80
[  397.183274]  [<c0104442>] syscall_call+0x7/0xb
[  397.185295]  [<c012007b>] __is_prefetch+0x9b/0x240
[  397.187269]  [<c01200d8>] __is_prefetch+0xf8/0x240
[  397.189292]  [<c010896c>] kernel_execve+0x1c/0x30
[  397.191266]  [<c013cce9>] ____call_usermodehelper+0x149/0x160
[  397.193553]  [<c013cba0>] ____call_usermodehelper+0x0/0x160
[  397.195770]  [<c0105677>] kernel_thread_helper+0x7/0x10
[  397.197930]  =======================
[  397.201726] Code: 1f 84 00 00 00 00 00 89 c6 fa 0f 1f 84 00 00 00 00 00 90 64 a1 08 60 47 c0 8b 6c 87 70 8b 5d 00 85 db 0f 84 8a 00 00 00 8b 45 0c <8b> 04 83 89 45 00 89 f0 50 9d 0f 1f 84 00 00 00 00 00 66 83 7c 
[  397.218331] EIP: [<c018e9c4>] __kmalloc+0x64/0x110 SS:ESP 0068:cd881d94
[  397.221152] ---[ end trace 27e5b19da5630b59 ]---

I have found at times that if I boot into single user mode, then do a few things (which really is probably just letting some time pass) then exit and let the boot continue into multi-user mode, things will work just fine.

Actually these backtraces don't help very much. Even the one from the first comment is an invalid access from kmalloc. This function was indeed called by sf_make_path() but kmalloc raises an invalid access only if there is something really wrong in the kernel structures. So currently no idea.

brian, is this problem still relevant?

Replying to frank:

brian, is this problem still relevant?

I guess not given that I just booted a Hardy guest that mounted both /usr and /home as vboxsf filesystems.

Hopefully thing "ping" means you are going through (my other) open tickets to get resolution as well. :-)

Note that there are currently about 1040 bugs open...

Ouch.