oops upon driver unload

During testing I got an OOPS with the brcmsmac (see attachment). I suspect mac80211 is using a driver callback after the module is removed (could be wrong here). The connection with the AP is dropped, and after 1 sec. the driver is unloaded using rmmod, which causes the driver to unregister from mac80211.

Any clues?

Gr. AvS

Mar 12 02:51:17 lb-bun-09 kernel: [575810.085726] ieee80211 phy0: FIF_BCN_PRBRES
P_PROMISC
Mar 12 02:52:34 lb-bun-09 kernel: [575886.855388] ieee80211 phy0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 0 (implement)
Mar 12 02:52:34 lb-bun-09 kernel: [575886.855933] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: false (implement)
Mar 12 02:52:34 lb-bun-09 kernel: [575886.855943] ieee80211 phy0: brcmsmac: brcms_ops_bss_info_changed: disassociated
Mar 12 02:52:34 lb-bun-09 kernel: [575886.855951] ieee80211 phy0: brcms_ops_bss_info_changed: arp filtering: enabled false, count 0 (implement)
Mar 12 02:52:34 lb-bun-09 kernel: [575886.855957] wlan3: deauthenticating from 98:fc:11:8e:94:58 by local choice (reason=3)
Mar 12 02:52:34 lb-bun-09 kernel: [575886.880401] cfg80211: All devices are disconnected, going to restore regulatory settings
Mar 12 02:52:34 lb-bun-09 kernel: [575886.880408] cfg80211: Restoring regulatory settings
Mar 12 02:52:34 lb-bun-09 kernel: [575886.880414] cfg80211: Calling CRDA to update world regulatory domain
Mar 12 02:52:34 lb-bun-09 kernel: [575886.887653] cfg80211: World regulatory domain updated:
Mar 12 02:52:34 lb-bun-09 kernel: [575886.909709] ieee80211 phy0: FIF_BCN_PRBRESP_PROMISC
Mar 12 02:52:35 lb-bun-09 kernel: [575888.181322] cfg80211: Found new beacon on frequency: 5240 MHz (Ch 48) on phy0
Mar 12 02:52:35 lb-bun-09 kernel: [575888.297978] cfg80211: Found new beacon on frequency: 5745 MHz (Ch 149) on phy0
Mar 12 02:52:35 lb-bun-09 kernel: [575888.443474] cfg80211: Found new beacon on frequency: 5765 MHz (Ch 153) on phy0
Mar 12 02:52:36 lb-bun-09 kernel: [575888.905711] ieee80211 phy0: FIF_BCN_PRBRESP_PROMISC
Mar 12 02:52:36 lb-bun-09 kernel: [575888.906010] wlan3: authenticate with 98:fc:11:8e:94:58
Mar 12 02:52:36 lb-bun-09 kernel: [575888.906057] wlan3: send auth to 98:fc:11:8e:94:58 (try 1/3)
Mar 12 02:52:36 lb-bun-09 kernel: [575888.906546] wlan3: authenticated
Mar 12 02:52:36 lb-bun-09 kernel: [575888.907688] wlan3: deauthenticating from 98:fc:11:8e:94:58 by local choice (reason=3)
Mar 12 02:52:36 lb-bun-09 kernel: [575888.909725] wlan3: associate with 98:fc:11:8e:94:58 (try 1/3)
Mar 12 02:52:36 lb-bun-09 kernel: [575889.108021] BUG: unable to handle kernel paging request at fb35e280
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] IP: [<fb35e280>] 0xfb35e27f
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] *pde = 2e77f067 *pte = 00000000 
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Oops: 0000 [#1] SMP 
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Modules linked in: aes_generic
 arc4 binfmt_misc psmouse snd_hda_codec_realtek snd_hda_intel snd_hda_codec serio_raw snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc usbhid hid i915 drm_kms_helper drm i2c_algo_bit floppy intel_agp r8169 intel_gtt mii video agpgart [last unloaded: bcma]
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] 
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Pid: 0, comm: swapper/0 Tainted: G        W  O 3.3.0-rc3-wl-testing-00002-g0e65d9a #1                  /DG41TY
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] EIP: 0060:[<fb35e280>] EFLAGS: 00010246 CPU: 0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] EIP is at 0xfb35e280
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] EAX: d7e61460 EBX: 000000bd ECX: 00000000 EDX: f540dfa0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] ESI: c17b4000 EDI: d7e61784 EBP: f540dfb4 ESP: f540df64
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Process swapper/0 (pid: 0, ti=f540c000 task=c16a1de0 task.ti=c169c000)
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Stack:
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  c103f0ea c1066109 00000000 f540df88 f5806e60 00000000 00000000 f540dfa0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  c17b4e10 c17b4c10 c17b4a10 d7e61460 fb35e280 c17b4810 00000100 f540dfa0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  f540dfa0 c169df10 00000004 00000141 f540dff8 c1037b9e f0f0f0f4 f0f0f0f0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Call Trace:
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c103f0ea>] ? run_timer_softirq+0x11a/0x2d0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c1066109>] ? rebalance_domains+0x89/0x150
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c1037b9e>] __do_softirq+0x9e/0x1b0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c1037b00>] ? irq_enter+0x70/0x70
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  <IRQ> 
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c10379dd>] ? irq_exit+0x9d/0xc0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c14b8869>] ? smp_apic_timer_interrupt+0x59/0x88
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c105da4e>] ? scheduler_ipi+0x4e/0xe0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c14b1e05>] ? apic_timer_interrupt+0x31/0x38
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c10700d8>] ? count_free_highmem_pages+0x28/0x70
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c1009dc8>] ? mwait_idle+0x88/0x180
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c1001d8e>] ? cpu_idle+0xae/0xf0
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c149cabd>] ? rest_init+0x5d/0x70
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c16f5853>] ? start_kernel+0x38a/0x390
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c16f52f3>] ? kernel_init+0x145/0x145
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002]  [<c16f5075>] ? i386_start_kernel+0x75/0x79
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] Code:  Bad EIP value.
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] EIP: [<fb35e280>] 0xfb35e280 SS:ESP 0068:f540df64
Mar 12 02:52:36 lb-bun-09 kernel: [575889.112002] CR2: 00000000fb35e280
Mar 12 02:55:00 lb-bun-09 kernel: [576032.619994] INFO: rcu_sched detected stall on CPU 0 (t=15000 jiffies)

What's the kernel version? I can't find your commit ("0e65d9a")

johannes

That's from our internal repository, but it is based on a 3.3-rc4 wireless-testing tree.

I am using nmcli for setting up connection with the AP and found that the connection is setup to be automatic. That is reason why the log shows auth attempt during module unload. It does not happen on each test run.

I will use debug suggestions from Stanislaw and try to get more information.

Gr. AvS

[snip]

Those options are useful to debug such problems:

CONFIG_DEBUG_OBJECTS=y
CONFIG_DEBUG_OBJECTS_FREE=y
CONFIG_DEBUG_OBJECTS_TIMERS=y
CONFIG_DEBUG_OBJECTS_WORK=y

Stanislaw

Thanks,

I will go and try that.

Gr. AvS