Hello,
Here is a description of my system :
Linux : 2.6.35-22-generic (on a ubuntu 10.04 LTS)
My wifi card is : 02:00.0 Network controller: Atheros Communications Inc.
AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
"dmesg" outputs about the wifi controller are :
Oct 10 17:28:49 kernel: [ 12.546288] ath9k 0000:02:00.0: PCI INT A -> GSI
17 (level, low) -> IRQ 17
Oct 10 17:28:49 kernel: [ 12.606040] HDA Intel 0000:00:1b.0: PCI INT A ->
GSI 16 (level, low) -> IRQ 16
Oct 10 17:28:49 kernel: [ 12.653486] phy0: Atheros AR9285 Rev:2
mem=0xf8e60000, irq=17
I am using an atheros Wifi Card in ad-hoc mode, I create my ad-hoc network
with two differents ways :
1. Thanks to the following commands :
ifconfig wlan2 down
iwconfig wlan2 mode Ad-Hoc
iwconfig wlan2 essid "Toto"
ifconfig wlan2 up
2. Thanks to the ubuntu network manager "Create a New Network" function's.
The way I use to create the network doesn't matter.
A few minutes after the AdHoc network is created, my system freeze. I have
got the following message in /var/log/kernel :
----------------- START OF MESSAGE ------------------
Oct 11 09:44:52 kernel: [ 840.290670] BUG: unable to handle kernel NULL
pointer dereference at 00000080
Oct 11 09:44:52 kernel: [ 840.290682] IP: [<c020cb7c>]
__kmalloc_track_caller+0x6c/0x170
Oct 11 09:44:52 kernel: [ 840.290697] *pde = 7e630067
Oct 11 09:44:52 kernel: [ 840.290703] Oops: 0000 [#1] SMP
Oct 11 09:44:52 kernel: [ 840.290709] last sysfs file:
/sys/devices/pci0000:00/0000:00:1e.0/0000:04:0b.0/local_cpus
Oct 11 09:44:52 kernel: [ 840.290716] Modules linked in: ipt_MASQUERADE
xt_state ipt_REJECT xt_tcpudp iptable_filter nf_nat_h323 nf_conntrack_h323
nf_nat_pptp nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_proto_gre
nf_nat_tftp nf_conntrack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc
nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp iptable_nat nf_nat
nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables
nls_iso8859_1 nls_cp437 vfat fat parport_pc ppdev snd_hda_codec_nvhdmi
binfmt_misc snd_hda_codec_realtek snd_hda_intel snd_hda_codec nvidia(P) arc4
snd_usb_audio ath9k snd_hwdep snd_usbmidi_lib snd_pcm ath9k_common
snd_seq_midi ath9k_hw joydev snd_rawmidi ath mac80211 snd_seq_midi_event
snd_seq snd_timer usbhid snd_seq_device cfg80211 uvcvideo intel_agp
usb_storage hid snd cdc_acm psmouse videodev v4l1_compat led_class serio_raw
coretemp xhci_hcd agpgart soundcore snd_page_alloc lp parport r8169 mii
Oct 11 09:44:52 kernel: [ 840.290822]
Oct 11 09:44:52 kernel: [ 840.290829] Pid: 757, comm: phy0 Tainted: P
2.6.35-22-generic #33-Ubuntu To be filled by O.E.M./To Be Filled By O.E.M.
Oct 11 09:44:52 kernel: [ 840.290837] EIP: 0060:[<c020cb7c>] EFLAGS:
00010002 CPU: 3
Oct 11 09:44:52 kernel: [ 840.290844] EIP is at
__kmalloc_track_caller+0x6c/0x170
Oct 11 09:44:52 kernel: [ 840.290849] EAX: c2705aec EBX: c07c6888 ECX:
c07c6888 EDX: 00000000
Oct 11 09:44:52 kernel: [ 840.290854] ESI: 000000d0 EDI: 00000080 EBP:
f3f6bebc ESP: f3f6be94
Oct 11 09:44:52 kernel: [ 840.290860] DS: 007b ES: 007b FS: 00d8 GS:
00e0 SS: 0068
Oct 11 09:44:52 kernel: [ 840.290866] Process phy0 (pid: 757, ti=f3f6a000
task=f3ec3f70 task.ti=f3f6a000)
Oct 11 09:44:52 kernel: [ 840.290870] Stack:
Oct 11 09:44:52 kernel: [ 840.290874] c2705a98 00000000 c04ece6e
c04eddf8 00000246 000000d0 000001c4 f35b5300
Oct 11 09:44:52 kernel: [ 840.290886] <0> 000000d0 000000ff f3f6bedc
c04ece98 c07c64d0 00000000 000000c0 f35b9000
Oct 11 09:44:52 kernel: [ 840.290900] <0> 00000000 f080d000 f3f6bef8
c04eddf8 ffffffff f080d000 f3dc8480 00000000
Oct 11 09:44:52 kernel: [ 840.290914] Call Trace:
Oct 11 09:44:52 kernel: [ 840.290924] [<c04ece6e>] ?
__alloc_skb+0x2e/0x100
Oct 11 09:44:52 kernel: [ 840.290931] [<c04eddf8>] ? skb_copy+0x38/0x90
Oct 11 09:44:52 kernel: [ 840.290938] [<c04ece98>] ?
__alloc_skb+0x58/0x100
Oct 11 09:44:52 kernel: [ 840.290944] [<c04eddf8>] ? skb_copy+0x38/0x90
Oct 11 09:44:52 kernel: [ 840.290976] [<f8e3714d>] ?
ieee80211_rx_mgmt_probe_req+0xed/0x130 [mac80211]
Oct 11 09:44:52 kernel: [ 840.291004] [<f8e3810d>] ?
ieee80211_ibss_rx_queued_mgmt+0x3d/0xf0 [mac80211]
Oct 11 09:44:52 kernel: [ 840.291012] [<c04ec5c0>] ?
skb_dequeue+0x50/0x70
Oct 11 09:44:52 kernel: [ 840.291039] [<f8e38211>] ?
ieee80211_ibss_work+0x51/0xd0 [mac80211]
Oct 11 09:44:52 kernel: [ 840.291049] [<c0161a4e>] ?
run_workqueue+0x8e/0x150
Oct 11 09:44:52 kernel: [ 840.291075] [<f8e381c0>] ?
ieee80211_ibss_work+0x0/0xd0 [mac80211]
Oct 11 09:44:52 kernel: [ 840.291084] [<c0161b94>] ?
worker_thread+0x84/0xe0
Oct 11 09:44:52 kernel: [ 840.291092] [<c0165e10>] ?
autoremove_wake_function+0x0/0x50
Oct 11 09:44:52 kernel: [ 840.291099] [<c0161b10>] ?
worker_thread+0x0/0xe0
Oct 11 09:44:52 kernel: [ 840.291106] [<c01659e4>] ? kthread+0x74/0x80
Oct 11 09:44:52 kernel: [ 840.291112] [<c0165970>] ? kthread+0x0/0x80
Oct 11 09:44:52 kernel: [ 840.291120] [<c010363e>] ?
kernel_thread_helper+0x6/0x10
Oct 11 09:44:52 kernel: [ 840.291123] Code: ec 75 5c 9c 58 8d 74 26 00 89
45 e8 fa 90 8d 74 26 00 64 8b 15 54 e0 8b c0 8b 03 8d 04 02 8b 38 85 ff 0f
84 99 00 00 00 8b 53 10 <8b> 14 17 89 10 8b 45 e8 50 9d 8d 74 26 00 85 ff 75
2a 8b 0d e4
Oct 11 09:44:52 kernel: [ 840.291196] EIP: [<c020cb7c>]
__kmalloc_track_caller+0x6c/0x170 SS:ESP 0068:f3f6be94
Oct 11 09:44:52 kernel: [ 840.291206] CR2: 0000000000000080
Oct 11 09:44:52 kernel: [ 840.291212] ---[ end trace 34d01f410e93db66
]---
----------------- END OF MESSAGE ------------------
Of course this message is only the call trace of the wifi driver, all
process running on the system generate a call trace. I am almost certain
that the problem come from the WiFi in AdHoc mode, because if I disable this
feature my system never freeze !
I will try with a newer kernel, but I read all the changelog from the 2.6.35
to 3.0, and I haven't seen any fix about my problem, so I don't think this
bug was fixed...
Any help will be very appreciated,
Best regads,
Adrien BARRAL.
Robopec.
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