Hi, I upgraded to 2.6.35-rc2 today, and it suddenly started spewing these errors at me in the kernel log: iwl3945 0000:0c:00.0: Microcode SW error detected. Restarting 0x82000008. iwl3945 0000:0c:00.0: Loaded firmware version: 15.32.2.9 iwl3945 0000:0c:00.0: Start IWL Error Log Dump: iwl3945 0000:0c:00.0: Status: 0x0002A2E4, count: 1 iwl3945 0000:0c:00.0: Desc Time asrtPC blink2 ilink1 nmiPC Line iwl3945 0000:0c:00.0: SYSASSERT (#5) 4272998189 0x008B6 0x13756 0x0031C 0x00000 764 iwl3945 0000:0c:00.0: Start IWL Event Log Dump: display last 20 count iwl3945 0000:0c:00.0: 4272997361 0x00000000 0600 iwl3945 0000:0c:00.0: 4272997369 0x000000d9 0106 iwl3945 0000:0c:00.0: 4272997370 0x00000000 0302 iwl3945 0000:0c:00.0: 4272997436 0x00000000 0304 iwl3945 0000:0c:00.0: 4272997535 0x000000a2 0600 iwl3945 0000:0c:00.0: 4272997540 0x00000004 0631 iwl3945 0000:0c:00.0: 4272997552 0x55000190 0630 iwl3945 0000:0c:00.0: 4272997553 0x56017c78 0630 iwl3945 0000:0c:00.0: 4272997568 0x000000d9 0106 iwl3945 0000:0c:00.0: 4272997570 0x00000000 0302 iwl3945 0000:0c:00.0: 4272997632 0x00000000 0304 iwl3945 0000:0c:00.0: 4272997653 0x000000d9 0106 iwl3945 0000:0c:00.0: 4272997655 0x00000000 0302 iwl3945 0000:0c:00.0: 4272997695 0x000000d4 0303 iwl3945 0000:0c:00.0: 4272997763 0x000000d9 0106 iwl3945 0000:0c:00.0: 4272997765 0x00000000 0302 iwl3945 0000:0c:00.0: 4272997834 0x00000000 0304 iwl3945 0000:0c:00.0: 4272998136 0x44400080 0401 iwl3945 0000:0c:00.0: 4272998151 0x00000017 0452 iwl3945 0000:0c:00.0: 4272998190 0x00000100 0125 iwl3945 0000:0c:00.0: Error Reply type 0x000002FC cmd REPLY_SCAN_CMD (0x80) seq 0x4440 ser 0x00340000 iwl3945 0000:0c:00.0: Command REPLY_SCAN_CMD failed: FW Error iwl3945 0000:0c:00.0: Can't stop Rx DMA. and then several times before I tried to switch APs, and got: BUG: unable to handle kernel NULL pointer dereference at 000000ae IP: [<f82c6a5f>] iwl3945_request_scan+0x3d7/0x538 [iwl3945] *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP last sysfs file: /sys/devices/platform/regulatory.0/uevent Modules linked in: tun iwl3945 iwlcore mac80211 cfg80211 sha256_generic aes_i586 aes_generic cbc uinput binfmt_misc ppdev lp parport sco bridge stp llc bnep rfcomm l2cap bluetooth kvm_intel kvm cpufreq_userspace cpufreq_stats cpufreq_conservative cpufreq_powersave fuse dm_crypt dm_snapshot dm_mirror dm_region_hash dm_log ipv6 cpufreq_ondemand acpi_cpufreq freq_table mperf sbp2 loop snd_hda_codec_idt snd_hda_intel snd_hda_codec arc4 ecb snd_pcm_oss snd_mixer_oss snd_pcm joydev snd_seq_dummy pcmcia snd_seq_oss tpm_tis snd_seq_midi i2c_i801 snd_rawmidi snd_seq_midi_event yenta_socket dell_laptop pcmcia_rsrc dcdbas evdev snd_seq snd_timer snd_seq_device tpm processor pcmcia_core battery ac snd psmouse tpm_bios soundcore snd_page_alloc serio_raw ext3 jbd dm_mod i915 drm_kms_helper i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect drm i2c_core sd_mod ide_pci_generic piix ide_core ata_generic uhci_hcd tg3 intel_agp ata_piix ehci_hcd libphy ohci1394 ieee1394 usbcore thermal video output button agpgart [last unloaded: cfg80211] Pid: 3679, comm: iwl3945 Tainted: G W 2.6.35-rc2 #1 0TJ984/Latitude D420 EIP: 0060:[<f82c6a5f>] EFLAGS: 00010287 CPU: 0 EIP is at iwl3945_request_scan+0x3d7/0x538 [iwl3945] EAX: 000000ae EBX: f67d0b40 ECX: 00000000 EDX: 00000000 ESI: f61bf8f2 EDI: 00000001 EBP: f2de3f5c ESP: f2de3f00 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process iwl3945 (pid: 3679, ti=f2de2000 task=f2daeff0 task.ti=f2de2000) Stack: 0057eff0 0016ff00 000000ae 00000001 f2daeff0 f2de3f70 c129e97b 005f1930 <0> 00000000 00000000 00000058 c149db00 c149db00 c149db00 f61bf800 00000000 <0> 00000000 00000000 00000001 008000d8 f67d0b40 f67d10b8 f67d6778 f2de3f70 Call Trace: [<c129e97b>] ? schedule+0x6ee/0x797 [<f87945db>] ? iwl_bg_start_internal_scan+0x84/0xa1 [iwlcore] [<c103f794>] ? worker_thread+0x15d/0x1e1 [<f8794557>] ? iwl_bg_start_internal_scan+0x0/0xa1 [iwlcore] [<c104285d>] ? autoremove_wake_function+0x0/0x2f [<c103f637>] ? worker_thread+0x0/0x1e1 [<c10424af>] ? kthread+0x5f/0x64 [<c1042450>] ? kthread+0x0/0x64 [<c1002c36>] ? kernel_thread_helper+0x6/0x10 Code: c8 b8 01 00 00 00 c7 45 c8 00 00 00 00 d3 e0 66 89 55 a6 88 45 b0 83 e8 02 88 45 a9 e9 c3 00 00 00 8b 55 c4 8b 44 90 20 89 45 ac <39> 38 0f 85 ae 00 00 00 66 8b 48 06 89 fa 88 4e 01 89 d8 0f b6 EIP: [<f82c6a5f>] iwl3945_request_scan+0x3d7/0x538 [iwl3945] SS:ESP 0068:f2de3f00 CR2: 00000000000000ae ---[ end trace 8058ad57766ccf7c ]--- Going back to 2.6.34-rc6, no problems there.
We recently pushed some fixes for this issue upstream but they did not make it into 2.6.35-rc2 - they will be in rc3. Could you try with the latest linux-2.6?
On Fri, Jun 11, 2010 at 06:46:59PM +0000, bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=16176 > We recently pushed some fixes for this issue upstream but they did not make > it > into 2.6.35-rc2 - they will be in rc3. Could you try with the latest > linux-2.6? I tried -rc3, and it was much, much worse, but in a different way. Basically, holding up TCP connections for more than a few seconds at a time was completely impossible. I could not even get through the captive portal here; everything would just hang randomly. (Tried N browsers and telnet.) /* Steinar */
Created attachment 26785 [details] more internal scan debug The commit I refer to in comment #1 is in rc3 and should take care of the BUG you encounter. You mention that things are behaving in a different way - are you still seeing the same errors? The fix I pointed out does not address the SYSASSERT. On a closer look that SYSASSERT is the hardware telling the driver that it is not legal to scan on channel zero. This is its regulatory enforcement. To look into this further I'd like to see some scan and also some general debugging. Please ensure your driver is compiled with debug support (CONFIG_IWLWIFI_DEBUG) and then load the module with debug flags as follows: modprobe iwl3945 debug=0x43fff I attach an additional debug patch that will get us a little more data if you are able to get it included in your driver that will be great.
OK, well, I guess I have bad news :-) I didn't have time to check this last week, and now I've traveled back from the US to Switzerland again. I don't see these problems anymore — the oopses were fixed already in 2.6.35-rc3, but the TCP problems are nowhere to be seen. Of course, if this really was a regulatory domain problem, I'd probably have to travel back to the US and the offending APs to reproduce... IPv6 routing is now, on the other hand, completely broken (I can only ping stuff on my local network, nothing that has to go through a default route), but I take it this is not iwl3945's fault. IOW, this is now unreproducible for me, so if nobody else steps forward with the same problems, I guess the bug has to be closed.
(In reply to comment #4) > IPv6 routing is now, on the other hand, completely broken (I can only ping > stuff on my local network, nothing that has to go through a default route), > but > I take it this is not iwl3945's fault. You may want to try http://git.kernel.org/?p=linux/kernel/git/iwlwifi/iwlwifi-2.6.git;a=commit;h=4d23e4e5eb50431426facf192354ad2506e2dd40 which fixes a multicast issue in iwl3945.
(In reply to comment #4) > I don't see > these problems anymore — the oopses were fixed already in 2.6.35-rc3, but the > TCP problems are nowhere to be seen. Of course, if this really was a > regulatory > domain problem, I'd probably have to travel back to the US and the offending > APs to reproduce... > ... > IOW, this is now unreproducible for me, so if nobody else steps forward with > the same problems, I guess the bug has to be closed.
Exactly from the moment where I built NetworkManager 0.8.9997 and replaced 0.8.4 with it, I have a lot of the below in dmesg/syslog, and scanning Wifi networks doesn't seem to work. I might have not built or set up NetworkManager entirely correct (even though everything else than scanning seems to work fine), but I am wondering how another version of NetworkManager can cause the iwl3945 Microcode SW error to happen? I am running Ubuntu 11.04 2.6.38-8-generic #42-Ubuntu. [ 5420.614860] iwl3945 0000:04:00.0: Microcode SW error detected. Restarting 0x82000008. [ 5420.614872] iwl3945 0000:04:00.0: Loaded firmware version: 15.32.2.9 [ 5420.614908] iwl3945 0000:04:00.0: Start IWL Error Log Dump: [ 5420.614914] iwl3945 0000:04:00.0: Status: 0x0002A2E4, count: 1 [ 5420.614919] iwl3945 0000:04:00.0: Desc Time asrtPC blink2 ilink1 nmiPC Line [ 5420.615153] iwl3945 0000:04:00.0: SYSASSERT (0x5) 2932061891 0x008B6 0x13756 0x0031C 0x00000 764 [ 5420.615156] [ 5420.615289] iwl3945 0000:04:00.0: Start IWL Event Log Dump: display last 20 count [ 5420.615334] iwl3945 0000:04:00.0: 2932060759 0x00000006 0463 [ 5420.615360] iwl3945 0000:04:00.0: 2932060760 0x00000006 0462 [ 5420.615385] iwl3945 0000:04:00.0: 2932060795 0x00000000 0201 [ 5420.615411] iwl3945 0000:04:00.0: 2932060806 0x0000001c 0206 [ 5420.615437] iwl3945 0000:04:00.0: 2932060808 0x00400001 0204 [ 5420.615462] iwl3945 0000:04:00.0: 2932060812 0x00400001 0219 [ 5420.615488] iwl3945 0000:04:00.0: 2932060813 0x00020041 0211 [ 5420.615513] iwl3945 0000:04:00.0: 2932060818 0x00000000 0212 [ 5420.615539] iwl3945 0000:04:00.0: 2932061149 0x00000000 0215 [ 5420.615565] iwl3945 0000:04:00.0: 2932061223 0x00400008 0220 [ 5420.615590] iwl3945 0000:04:00.0: 2932061238 0x00000000 0301 [ 5420.615616] iwl3945 0000:04:00.0: 2932061507 0x000000d4 0303 [ 5420.615641] iwl3945 0000:04:00.0: 2932061834 0x442d0080 0401 [ 5420.615667] iwl3945 0000:04:00.0: 2932061848 0x00000017 0452 [ 5420.615692] iwl3945 0000:04:00.0: 2932061853 0x00103b6e 0450 [ 5420.615717] iwl3945 0000:04:00.0: 2932061859 0x00103b6e 0450 [ 5420.615743] iwl3945 0000:04:00.0: 2932061864 0x00103b6e 0450 [ 5420.615769] iwl3945 0000:04:00.0: 2932061869 0x00103b6e 0450 [ 5420.615794] iwl3945 0000:04:00.0: 2932061874 0x00103b6e 0450 [ 5420.615820] iwl3945 0000:04:00.0: 2932061893 0x00000100 0125 [ 5420.615848] iwl3945 0000:04:00.0: Error Reply type 0x000002FC cmd REPLY_SCAN_CMD (0x80) seq 0x442D ser 0x00340000 [ 5420.620278] iwl3945 0000:04:00.0: Can't stop Rx DMA.