Arnaldo/Andrea,
When I do this:
./ttcp_acme -c -l500 -r
I get a null pointer dereference in net/dccp/feat.c on line 427 which
is list_for_each_entry_safe.
Did some more testing and found it was because I had only CCID3
compiled as module and not CCID2. (i.e. bug occurs when
CONFIG_IP_DCCP_ACKVEC and CONFIG_IP_DCCP_CCID2 are not set).
If either of you too can fix that it'd be cool otherwise I'll add it
to my list of rainy day bugs....
void dccp_feat_clean(struct sock *sk)
{
struct dccp_sock *dp = dccp_sk(sk);
struct dccp_opt_pend *opt, *next;
list_for_each_entry_safe(opt, next, &dp->dccps_options.dccpo_pending,
dccpop_node) {
Feb 14 11:12:19 localhost kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000000
Feb 14 11:12:19 localhost kernel: printing eip:
Feb 14 11:12:19 localhost kernel: e0b9bac0
Feb 14 11:12:19 localhost kernel: *pde = 00000000
Feb 14 11:12:19 localhost kernel: Oops: 0000 [#1]
Feb 14 11:12:19 localhost kernel: PREEMPT
Feb 14 11:12:19 localhost kernel: Modules linked in: dccp lp af_packet
mousedev ide_generic usbhid snd_seq_dummy snd_seq_oss snd_seq_midi
snd_seq_midi_event snd_seq snd_mpu401 psmouse floppy parport_pc
parport pcspkr snd_via82xx snd_ac97_codec snd_ac97_bus rtc snd_pcm_oss
snd_mixer_oss 8139cp snd_pcm snd_timer snd_page_alloc snd_mpu401_uart
snd_rawmidi snd_seq_device snd soundcore i2c_viapro via_agp agpgart
i2c_core 8139too mii uhci_hcd usbcore ide_cd cdrom unix
Feb 14 11:12:19 localhost kernel: CPU: 0
Feb 14 11:12:19 localhost kernel: EIP:
0060:[pg0+545561280/1070253056] Not tainted VLI
Feb 14 11:12:19 localhost kernel: EFLAGS: 00010246 (2.6.16-rc2iandccp #1)
Feb 14 11:12:19 localhost kernel: EIP is at dccp_feat_clean+0xf/0xaa [dccp]
Feb 14 11:12:19 localhost kernel: eax: 00000000 ebx: 00000000 ecx:
dae16bb4 edx: 00000000
Feb 14 11:12:19 localhost kernel: esi: dae16808 edi: dae16808 ebp:
dacd3edc esp: dacd3ed0
Feb 14 11:12:19 localhost kernel: ds: 007b es: 007b ss: 0068
Feb 14 11:12:19 localhost kernel: Process ttcp_acme (pid: 3726,
threadinfo=dacd2000 task=dca94ab0)
Feb 14 11:12:19 localhost kernel: Stack: <0>dae16808 dae16808 fffffff4
dacd3efc e0b9d679 dae16808 00000000 dae16808
Feb 14 11:12:19 localhost kernel: 00000000 dae16808 dae16808
dacd3f10 c02218d0 dae16808 dae16808 dae16808
Feb 14 11:12:19 localhost kernel: dacd3f30 c025d29e dae16808
00044544 00000001 00000002 db10f96c 00000006
Feb 14 11:12:19 localhost kernel: Call Trace:
Feb 14 11:12:19 localhost kernel: [show_stack_log_lvl+170/181]
show_stack_log_lvl+0xaa/0xb5
Feb 14 11:12:19 localhost kernel: [show_registers+295/397]
show_registers+0x127/0x18d
Feb 14 11:12:19 localhost kernel: [die+321/441] die+0x141/0x1b9
Feb 14 11:12:19 localhost kernel: [do_page_fault+915/1229]
do_page_fault+0x393/0x4cd
Feb 14 11:12:19 localhost kernel: [error_code+79/84] error_code+0x4f/0x54
Feb 14 11:12:19 localhost kernel: [pg0+545568377/1070253056]
dccp_v4_destroy_sock+0xe7/0xee [dccp]
Feb 14 11:12:19 localhost kernel: [sk_common_release+21/147]
sk_common_release+0x15/0x93
Feb 14 11:12:19 localhost kernel: [inet_create+606/641] inet_create+0x25e/0x281
Feb 14 11:12:19 localhost kernel: [__sock_create+295/533]
__sock_create+0x127/0x215
Feb 14 11:12:19 localhost kernel: [sys_socket+23/63] sys_socket+0x17/0x3f
Feb 14 11:12:19 localhost kernel: [sys_socketcall+86/363]
sys_socketcall+0x56/0x16b
Feb 14 11:12:19 localhost kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Feb 14 11:12:19 localhost kernel: Code: 68 31 2e ba e0 68 95 39 ba e0
e8 69 b5 57 df 83 c4 10 8d 65 f4 31 c0 5b 5e 5f 5d c3 55 89 e5 57 8b
7d 08 56 53 8b 9f 78 03 00 00 <8b> 33 eb 46 8b 43 0c 85 c0 75 08 0f 0b
ad 01 dd 37 ba e0 50 e8
--
Ian McDonald
http://wand.net.nz/~iam4
WAND Network Research Group
Department of Computer Science
University of Waikato
New Zealand
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