Messages in this thread | | | Date | Mon, 21 Jul 2008 14:43:34 -0500 | From | Larry Finger <> | Subject | Re: [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370 |
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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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