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    SubjectRe: kernel BUG in iwl-agn-rs.c:2076, WAS: iwlagn + some accesspoint == hardlock
      Hi,

    short feedback:

    - recompiled kernel and config80211 as M
    - debug symbols included. Yet to try.
    - reboot
    Linux mypole 2.6.33.3 #22 SMP PREEMPT Thu May 13 12:52:22 CEST 2010 i686 GNU/Linux
    - renamed in-tree iwlagn and iwlcore, ran depmod -a, confirmed by looking into modules.dep
    - compat wireless compiled ok, modprobe fails w/:

    [ 23.665814] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
    [ 23.665817] iwlagn: Copyright(c) 2003-2010 Intel Corporation
    [ 23.665869] BUG: unable to handle kernel NULL pointer dereference at (null)
    [ 23.665934] IP: [<f8931b40>] iwl_alloc_all+0x20/0x50 [iwlcore]
    [ 23.665980] *pdpt = 0000000036448001 *pde = 0000000000000000
    [ 23.666019] Oops: 0002 [#1] PREEMPT SMP
    [ 23.666019] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/type
    [ 23.666019] Modules linked in: iwlagn(+) iwlcore mac80211 uhci_hcd e1000e cfg80211
    [ 23.666019]
    [ 23.666019] Pid: 356, comm: modprobe Not tainted 2.6.33.3 #22 7666B4G/7666B4G
    [ 23.666019] EIP: 0060:[<f8931b40>] EFLAGS: 00010282 CPU: 0
    [ 23.666019] EIP is at iwl_alloc_all+0x20/0x50 [iwlcore]
    [ 23.666019] EAX: 00000000 EBX: f8998f20 ECX: f61d0280 EDX: f88e1870
    [ 23.666019] ESI: f61d0280 EDI: f8998f20 EBP: 00000000 ESP: f64ede38
    [ 23.666019] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    [ 23.666019] Process modprobe (pid: 356, ti=f64ec000 task=f64b2030 task.ti=f64ec000)
    [ 23.666019] Stack:
    [ 23.666019] c114241c f64ede58 f752bc00 f89987c0 f897eed5 00000000 a1ffde9c f65affe0
    [ 23.666019] <0> 000033bf f606dbbc f7535b0c c16f06bd c16f03fc c134d180 f752bc00 f89987c0
    [ 23.666019] <0> f897ee90 00000000 c134d02b c134d851 f89987c0 f752bc00 f8997e9c f752bc5c
    [ 23.666019] Call Trace:
    [ 23.666019] [<c114241c>] ? sysfs_add_one+0x1c/0x140
    [ 23.666019] [<f897eed5>] ? iwl_pci_probe+0x45/0x9c0 [iwlagn]
    [ 23.666019] [<c16f06bd>] ? _raw_spin_lock+0xd/0x30
    [ 23.666019] [<c16f03fc>] ? _raw_spin_unlock+0xc/0x20
    [ 23.666019] [<c134d180>] ? pci_match_device+0xa0/0xc0
    [ 23.666019] [<f897ee90>] ? iwl_pci_probe+0x0/0x9c0 [iwlagn]
    [ 23.666019] [<c134d02b>] ? local_pci_probe+0xb/0x10
    [ 23.666019] [<c134d851>] ? pci_device_probe+0x61/0x80
    [ 23.666019] [<c1415dbb>] ? driver_probe_device+0x7b/0x170
    [ 23.666019] [<c134d180>] ? pci_match_device+0xa0/0xc0
    [ 23.666019] [<c16f0689>] ? _raw_spin_lock_irqsave+0x19/0x40
    [ 23.671155] [<c1415f29>] ? __driver_attach+0x79/0x80
    [ 23.671155] [<c1415eb0>] ? __driver_attach+0x0/0x80
    [ 23.671155] [<c1415622>] ? bus_for_each_dev+0x52/0x80
    [ 23.671155] [<c1415c56>] ? driver_attach+0x16/0x20
    [ 23.671155] [<c1415eb0>] ? __driver_attach+0x0/0x80
    [ 23.671155] [<c1414f1c>] ? bus_add_driver+0xcc/0x2b0
    [ 23.671155] [<c134d790>] ? pci_device_remove+0x0/0x40
    [ 23.671155] [<c14161c3>] ? driver_register+0x63/0x120
    [ 23.671155] [<f899e000>] ? iwl_init+0x0/0x6a [iwlagn]
    [ 23.671155] [<f899e000>] ? iwl_init+0x0/0x6a [iwlagn]
    [ 23.671155] [<c134da7d>] ? __pci_register_driver+0x3d/0xb0
    [ 23.671155] [<f899e04d>] ? iwl_init+0x4d/0x6a [iwlagn]
    [ 23.671155] [<c100112f>] ? do_one_initcall+0x2f/0x190
    [ 23.671155] [<c107ad54>] ? sys_init_module+0xb4/0x220
    [ 23.671155] [<c1002c8c>] ? sysenter_do_call+0x12/0x22
    [ 23.671155] Code: b6 00 00 00 00 8d bf 00 00 00 00 83 ec 10 89 5c 24 08 89 c3 b8 24 63 00 00 89 74 24 0c e8 59 fa fa ff 85 c0 89 c6 74 13 8b 40 30 <89> 30 89 f0 8b 5c 24 08 8b 74 24 0c 83 c4 10 c3 8b 03 c7 04 24
    [ 23.671155] EIP: [<f8931b40>] iwl_alloc_all+0x20/0x50 [iwlcore] SS:ESP 0068:f64ede38
    [ 23.671155] CR2: 0000000000000000
    [ 23.693150] ---[ end trace 2f287167f09b7fb3 ]---


    So, suspending test w/ compat-wireless drivers, doing w/ those in-tree w/ dbg symbols included and activated.

    Cheers,

    Nils



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