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    SubjectRe: [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370

    * 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>

    Ingo


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