It took me some hours to set up a vm and working around a few bugs (eg. bug 935585), but finally I got the mainline kernel working.
[ 1096.823058] BUG: unable to handle kernel NULL pointer dereference at (null) [ 1096.823064] IP: [< (null)>] (null) [ 1096.823067] PGD 17c37067 PUD 929e067 PMD 0 [ 1096.823069] Oops: 0010 [#1] SMP [ 1096.823072] Modules linked in: arc4 md4 nls_utf8 cifs fscache nf_conntrack_ipv6 nf_defrag_ipv6 xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack vboxvideo(OF) drm ip6table_filter ip6_tables iptable_filter ip_tables x_tables bnep rfcomm bluetooth lp snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device joydev snd_timer hid_generic psmouse usbhid snd ppdev hid serio_raw soundcore parport_pc i2c_piix4 parport microcode mac_hid e1000 [ 1096.823092] CPU 0 [ 1096.823096] Pid: 7375, comm: mount.cifs Tainted: GF O 3.8.0-030800rc2-generic #201301022235 innotek GmbH VirtualBox/VirtualBox [ 1096.823098] RIP: 0010:[<0000000000000000>] [< (null)>] (null) [ 1096.823100] RSP: 0018:ffff88000929dc70 EFLAGS: 00010246 [ 1096.823101] RAX: ffffffffa02a56c0 RBX: ffff88000d559e40 RCX: 0000000000000000 [ 1096.823102] RDX: 0000000000000000 RSI: ffff88000d559e40 RDI: ffff880007142350 [ 1096.823103] RBP: ffff88000929dc98 R08: ffff88001fc17380 R09: ffffc90000000000 [ 1096.823104] R10: ffffffffa02818b5 R11: 0000000007e44712 R12: ffff88000d5599c0 [ 1096.823105] R13: ffff88001b6c2651 R14: ffff88001b6c2640 R15: ffff8800071423f8 [ 1096.823109] FS: 00007fd220cfe740(0000) GS:ffff88001fc00000(0000) knlGS:0000000000000000 [ 1096.823110] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 1096.823111] CR2: 0000000000000000 CR3: 0000000003d19000 CR4: 00000000000006f0 [ 1096.823114] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1096.823120] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 1096.823122] Process mount.cifs (pid: 7375, threadinfo ffff88000929c000, task ffff880000ff2e40) [ 1096.823122] Stack: [ 1096.823157] ffffffff811a266d ffff88000d5599c0 ffff88001b6c2651 ffff88001b6c2640 [ 1096.823160] 0000000000000000 ffff88000929dcc8 ffffffff811a2ad8 ffff88001b6c2651 [ 1096.823162] 01ff88000d5599c0 ffff88001b6c2651 ffff88000d5599c0 ffff88000929dd08 [ 1096.823164] Call Trace: [ 1096.823169] [<ffffffff811a266d>] ? lookup_real+0x1d/0x60 [ 1096.823171] [<ffffffff811a2ad8>] __lookup_hash+0x38/0x50 [ 1096.823174] [<ffffffff811a6b7e>] lookup_one_len+0xce/0x120 [ 1096.823181] [<ffffffffa026d7e1>] cifs_get_root+0x111/0x190 [cifs] [ 1096.823186] [<ffffffffa026d9e2>] cifs_do_mount+0x182/0x270 [cifs] [ 1096.823189] [<ffffffff8119c623>] mount_fs+0x43/0x1b0 [ 1096.823191] [<ffffffff811b73d6>] vfs_kern_mount+0x76/0x120 [ 1096.823193] [<ffffffff811b8851>] do_new_mount+0xb1/0x1e0 [ 1096.823195] [<ffffffff811ba066>] do_mount+0x1b6/0x1f0 [ 1096.823197] [<ffffffff811ba130>] sys_mount+0x90/0xe0 [ 1096.823200] [<ffffffff816f14dd>] system_call_fastpath+0x1a/0x1f [ 1096.823201] Code: Bad RIP value. [ 1096.823205] RIP [< (null)>] (null) [ 1096.823206] RSP <ffff88000929dc70> [ 1096.823207] CR2: 0000000000000000 [ 1096.823210] ---[ end trace 44c55e75aa8302d1 ]---
It took me some hours to set up a vm and working around a few bugs (eg. bug 935585), but finally I got the mainline kernel working.
[ 1096.823058] BUG: unable to handle kernel NULL pointer dereference at (null) -generic #201301022235 innotek GmbH VirtualBox/ VirtualBox 000000000000000 0>] [< (null)>] (null) 29dc70 EFLAGS: 00010246 0(0000) GS:ffff88001fc0 0000(0000) knlGS:000000000 0000000 66d>] ? lookup_ real+0x1d/ 0x60 ad8>] __lookup_ hash+0x38/ 0x50 b7e>] lookup_ one_len+ 0xce/0x120 7e1>] cifs_get_ root+0x111/ 0x190 [cifs] 9e2>] cifs_do_ mount+0x182/ 0x270 [cifs] 623>] mount_fs+0x43/0x1b0 3d6>] vfs_kern_ mount+0x76/ 0x120 851>] do_new_ mount+0xb1/ 0x1e0 066>] do_mount+ 0x1b6/0x1f0 130>] sys_mount+0x90/0xe0 4dd>] system_ call_fastpath+ 0x1a/0x1f
[ 1096.823064] IP: [< (null)>] (null)
[ 1096.823067] PGD 17c37067 PUD 929e067 PMD 0
[ 1096.823069] Oops: 0010 [#1] SMP
[ 1096.823072] Modules linked in: arc4 md4 nls_utf8 cifs fscache nf_conntrack_ipv6 nf_defrag_ipv6 xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack vboxvideo(OF) drm ip6table_filter ip6_tables iptable_filter ip_tables x_tables bnep rfcomm bluetooth lp snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device joydev snd_timer hid_generic psmouse usbhid snd ppdev hid serio_raw soundcore parport_pc i2c_piix4 parport microcode mac_hid e1000
[ 1096.823092] CPU 0
[ 1096.823096] Pid: 7375, comm: mount.cifs Tainted: GF O 3.8.0-030800rc2
[ 1096.823098] RIP: 0010:[<
[ 1096.823100] RSP: 0018:ffff880009
[ 1096.823101] RAX: ffffffffa02a56c0 RBX: ffff88000d559e40 RCX: 0000000000000000
[ 1096.823102] RDX: 0000000000000000 RSI: ffff88000d559e40 RDI: ffff880007142350
[ 1096.823103] RBP: ffff88000929dc98 R08: ffff88001fc17380 R09: ffffc90000000000
[ 1096.823104] R10: ffffffffa02818b5 R11: 0000000007e44712 R12: ffff88000d5599c0
[ 1096.823105] R13: ffff88001b6c2651 R14: ffff88001b6c2640 R15: ffff8800071423f8
[ 1096.823109] FS: 00007fd220cfe74
[ 1096.823110] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1096.823111] CR2: 0000000000000000 CR3: 0000000003d19000 CR4: 00000000000006f0
[ 1096.823114] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1096.823120] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1096.823122] Process mount.cifs (pid: 7375, threadinfo ffff88000929c000, task ffff880000ff2e40)
[ 1096.823122] Stack:
[ 1096.823157] ffffffff811a266d ffff88000d5599c0 ffff88001b6c2651 ffff88001b6c2640
[ 1096.823160] 0000000000000000 ffff88000929dcc8 ffffffff811a2ad8 ffff88001b6c2651
[ 1096.823162] 01ff88000d5599c0 ffff88001b6c2651 ffff88000d5599c0 ffff88000929dd08
[ 1096.823164] Call Trace:
[ 1096.823169] [<ffffffff811a2
[ 1096.823171] [<ffffffff811a2
[ 1096.823174] [<ffffffff811a6
[ 1096.823181] [<ffffffffa026d
[ 1096.823186] [<ffffffffa026d
[ 1096.823189] [<ffffffff8119c
[ 1096.823191] [<ffffffff811b7
[ 1096.823193] [<ffffffff811b8
[ 1096.823195] [<ffffffff811ba
[ 1096.823197] [<ffffffff811ba
[ 1096.823200] [<ffffffff816f1
[ 1096.823201] Code: Bad RIP value.
[ 1096.823205] RIP [< (null)>] (null)
[ 1096.823206] RSP <ffff88000929dc70>
[ 1096.823207] CR2: 0000000000000000
[ 1096.823210] ---[ end trace 44c55e75aa8302d1 ]---