When I switched from kernel 2.6.23 to kernel 2.6.24 I got this in my dmesg:
BUG: unable to handle kernel NULL pointer dereference at virtual
address 0000005c
printing eip: c01b30e9 *pde = 00000000
Oops: 0000 [#1] SMP
Pid: 5639, comm: nfsd Not tainted (2.6.24-gentoo-r3 #1)
EIP: 0060:[<c01b30e9>] EFLAGS: 00010286 CPU: 0
EIP is at max_item_size_node40+0xc/0x16
EAX: 00000000 EBX: 00000002 ECX: f613776c EDX: c01b87ac
ESI: c04ee640 EDI: c0486b45 EBP: f5ef8b9c ESP: f5ef8b20
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process nfsd (pid: 5639, ti=f5ef8000 task=f7cb2030 task.ti=f5ef8000)
Stack: c01b87b7 c01a1fe8 c01b2caa 00000002 c01b2636 0012be44 00000000 f5ef8c1c
f613776c 00016708 00000000 00000008 c04ee640 00000007 c01a4dd1 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Call Trace:
[<c01b87b7>] max_name_len_cde+0xb/0xf
[<c01a1fe8>] reiser4_max_filename_len+0x1e/0x1f
[<c01b2caa>] is_name_acceptable_common+0x8/0x12
[<c01b2636>] reiser4_lookup_name+0x29/0xf0
[<c01a4dd1>] plugin_set_field+0x2b/0x389
[<c01b2e57>] get_parent_common+0x50/0xc1
[<c01a099b>] reiser4_get_dentry_parent+0x1b/0x1d
[<c01fc87d>] reconnect_path+0xd2/0x1f3
[<c01a0ccd>] oid_next+0xe/0x29
[<c018c606>] jrelse+0xf/0x17
[<c01a2061>] init_inode_ordering+0x53/0x6e
[<c0190f21>] longterm_unlock_znode+0x9b/0x188
[<c01a1f2b>] reiser4_iget+0x295/0x2ce
[<c016791b>] d_alloc+0x15b/0x173
[<c0167c5e>] d_alloc_anon+0x56/0xd2
[<c01a8683>] wire_get_common+0x34/0x6b
[<c01a009f>] reiser4_get_dentry_fsdata+0x3a/0x57
[<c01a0a15>] reiser4_decode_fh+0x78/0x82
[<c01a0b41>] reiser4_fh_to_dentry+0x2a/0x31
[<c01fcaf8>] exportfs_decode_fh+0x66/0x1a2
[<c03eb5f5>] cache_check+0x59/0x3bb
[<c0202870>] exp_get_by_name+0x43/0x52
[<c03ec3f9>] sunrpc_cache_lookup+0x3e/0xf4
[<c03eb5f5>] cache_check+0x59/0x3bb
[<c012ba1f>] set_current_groups+0x108/0x143
[<c0204518>] nfsd_setuser+0x125/0x175
[<c01feee7>] nfsd_setuser_and_check_port+0x4f/0x57
[<c0202ade>] exp_find+0x5b/0x63
[<c0202b14>] rqst_exp_find+0x2e/0xa5
[<c01ff5ef>] fh_verify+0x1e8/0x47d
[<c01ff34e>] nfsd_acceptable+0x0/0xb9
[<c03e607d>] svc_sock_enqueue+0x241/0x28f
[<c01ffad4>] nfsd_access+0x1f/0xdf
[<c0205d37>] nfsd3_proc_access+0xa5/0xaf
[<c01fcde8>] nfsd_dispatch+0xd3/0x1a0
[<c03e8813>] svcauth_unix_set_client+0x133/0x160
[<c03e54aa>] svc_process+0x3be/0x670
[<c03e7349>] svc_recv+0x314/0x389
[<c011e40f>] sched_move_task+0xbf/0xc5
[<c01fd32e>] nfsd+0x171/0x27b
[<c01fd1bd>] nfsd+0x0/0x27b
[<c010403f>] kernel_thread_helper+0x7/0x10
=======================
Code: eb 04 66 8b 43 fa 5b 29 d0 0f b7 c0 c3 b8 01 00 00 00 c3 b8 01
00 00 00 c3 b8 01 00 00 00 c3 64 a1 00 c0 56 c0 8b 80 ec 04 00 00 <8b>
40 5c 8b 40 0c 83 e8 42 c3 53 8b 18 0f b7 48 04 8b 5b 28 6b
EIP: [<c01b30e9>] max_item_size_node40+0xc/0x16 SS:ESP 0068:f5ef8b20
---[ end trace cbbad9b099e5b9be ]---
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