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    SubjectRe: [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370
    Ingo Molnar wrote:
    > * Larry Finger <Larry.Finger@lwfinger.net> wrote:
    >
    >> Ingo Molnar wrote:
    >>> * Ian Schram <ischram@telenet.be> wrote:
    >>>
    >>>> I was looking at this out of interest, but I'm in no way familiar
    >>>> with the code.
    >>> thanks Ian for the patch, i'll test it.
    >>>
    >>> Note that it was whitespace damaged, find below a tidied up version of
    >>> the patch that i've applied to tip/out-of-tree.
    >>>
    >>> Ingo
    >> This patch may be needed to fix error handling in the hw_sim code, but
    >> I get the crash even with that code disabled. I'm currently bisecting
    >> to find the culprit.
    >
    > ok. I just reactivated CONFIG_MAC80211_HWSIM, applied Ian's fix and the
    > crash went away:
    >
    > calling iwl4965_init+0x0/0x6c
    > iwl4965: Intel(R) Wireless WiFi Link 4965AGN driver for Linux, 1.3.27kd
    > iwl4965: Copyright(c) 2003-2008 Intel Corporation
    > initcall iwl4965_init+0x0/0x6c returned 0 after 10 msecs
    > calling init_mac80211_hwsim+0x0/0x31c
    > mac80211_hwsim: Initializing radio 0
    > PM: Adding info for No Bus:hwsim0
    > PM: Adding info for No Bus:phy0
    > PM: Adding info for No Bus:wmaster0
    > phy0: Failed to select rate control algorithm
    > phy0: Failed to initialize rate control algorithm
    > PM: Removing info for No Bus:wmaster0
    > PM: Removing info for No Bus:phy0
    > mac80211_hwsim: ieee80211_register_hw failed (-2)
    > PM: Removing info for No Bus:hwsim0
    > initcall init_mac80211_hwsim+0x0/0x31c returned -2 after 58 msecs
    > initcall init_mac80211_hwsim+0x0/0x31c returned with error code -2
    > calling dmfe_init_module+0x0/0xea
    > dmfe: Davicom DM9xxx net driver, version 1.36.4 (2002-01-17)
    > initcall dmfe_init_module+0x0/0xea returned 0 after 5 msecs
    >
    > So at least as far as the init_mac80211_hwsim() deinit crash goes:
    >
    > Tested-by: Ingo Molnar <mingo@elte.hu>

    Yes, I'm chasing a distinct bug. The header for mine is

    Jul 21 12:19:37 larrylap kernel: kernel BUG at net/core/dev.c:1328!
    Jul 21 12:19:37 larrylap kernel: invalid opcode: 0000 [1] SMP
    Jul 21 12:19:37 larrylap kernel: CPU 0
    Jul 21 12:19:37 larrylap kernel: Modules linked in: af_packet rfkill_input nfs
    lockd nfs_acl sunrpc cpufreq_conservative cpu
    freq_userspace cpufreq_powersave powernow_k8 fuse loop dm_mod arc4 ecb
    crypto_blkcipher b43 firmware_class rfkill mac80211 c
    fg80211 snd_hda_intel snd_pcm snd_timer led_class snd k8temp input_polldev
    sr_mod soundcore button battery hwmon cdrom force
    deth ac serio_raw ssb snd_page_alloc sg ehci_hcd sd_mod ohci_hcd usbcore edd fan
    thermal processor ext3 mbcache jbd pata_amd
    ahci libata scsi_mod dock
    Jul 21 12:19:37 larrylap kernel: Pid: 2057, comm: b43 Not tainted
    2.6.26-Linus-git-05253-g14b395e #1
    Jul 21 12:19:37 larrylap kernel: RIP: 0010:[<ffffffff8039ec4d>]
    [<ffffffff8039ec4d>] __netif_schedule+0x12/0x75
    Jul 21 12:19:37 larrylap kernel: RSP: 0000:ffff8800b9ae1de0 EFLAGS: 00010246

    With an invalid opcode, mine is likely due to stack corruption.

    Larry


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