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Date: Tue, 15 Sep 2009 15:39:58 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
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To: Suresh Jayaram <sureshjayaram@gmail.com>
cc: Andrew Morton <akpm@linux-foundation.org>, mm-commits@vger.kernel.org,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@elte.hu>,
       Jin Dongming <jin.dongming@np.css.fujitsu.com>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>
Subject: Re: mmotm 2009-09-09-22-56 uploaded
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On Tue, 15 Sep 2009, Suresh Jayaram wrote:

> >  [ I notice Thomas has since provided patches for this problem, so I'll
> >   check if it solves this issue on T60p. ]
> >

Thomas' patches in timers/core do fix this issue, so no revert will be 
necessary in linux-next when the next -mm is released.

> Sep 15 15:29:36 jay-t60p kernel: BUG: unable to handle kernel NULL
> pointer dereference at (null)
> Sep 15 15:29:36 jay-t60p kernel: IP: [<ffffffff81178954>]
> bitmap_scnprintf+0x5a/0xae
> Sep 15 15:29:36 jay-t60p kernel: PGD 0
> Sep 15 15:29:36 jay-t60p kernel: Oops: 0000 [#1] SMP
> Sep 15 15:29:36 jay-t60p kernel: last sysfs file:
> /sys/devices/pci0000:00/0000:00:01.0/local_cpus
> Sep 15 15:29:36 jay-t60p kernel: CPU 1
> Sep 15 15:29:36 jay-t60p kernel: Modules linked in: bnep sco nfsd
> exportfs rfcomm l2cap crc16 snd_pcm_oss snd_mixer_oss snd_seq
> binfmt_misc snd_seq_device nfs lockd nfs_acl auth_rpcgss sunrpc ipv6
> cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq
> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack
> nf_defrag_ipv4 ip_tables x_tables bridge stp tun fuse loop dm_mod
> snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep rtc_cmos
> pcmcia btusb snd_pcm snd_timer snd ppdev thinkpad_acpi rtc_core
> i2c_i801 yenta_socket iTCO_wdt nsc_ircc usbhid ide_cd_mod video
> rsrc_nonstatic pl2303 bluetooth hid soundcore parport_pc led_class
> output rtc_lib ac battery button intel_agp i2c_core pcmcia_core pcspkr
> usbserial iTCO_vendor_support irda e1000e cdrom snd_page_alloc parport
> sg rfkill joydev uinput crc_ccitt uhci_hcd ehci_hcd sd_mod crc_t10dif
> usbcore edd ext3 mbcache jbd fan ide_pci_generic ata_generic ata_piix
> pata_acpi ahci libata scsi_mod piix ide_core thermal processor
> thermal_sys hwmon
> Sep 15 15:29:36 jay-t60p kernel: Pid: 2478, comm: irqbalance Not
> tainted 2.6.31-rc9-mm1-0.1-default #7 20088JQ
> Sep 15 15:29:36 jay-t60p kernel: RIP: 0010:[<ffffffff81178954>]
> [<ffffffff81178954>] bitmap_scnprintf+0x5a/0xae
> Sep 15 15:29:36 jay-t60p kernel: RSP: 0018:ffff880037a81e38  EFLAGS: 00010246
> Sep 15 15:29:36 jay-t60p kernel: RAX: 0000000000000000 RBX:
> 0000000000000000 RCX: 0000000000000000
> Sep 15 15:29:36 jay-t60p kernel: RDX: 0000000000000002 RSI:
> 0000000000000ffe RDI: 0000000000000000
> Sep 15 15:29:36 jay-t60p kernel: RBP: ffff880037a81e68 R08:
> 0000000000000005 R09: 0000000000000001
> Sep 15 15:29:36 jay-t60p kernel: R10: ffffffff813c1cd3 R11:
> 0000000000000001 R12: 0000000000000000
> Sep 15 15:29:36 jay-t60p kernel: R13: 0000000000000000 R14:
> 0000000000000ffe R15: ffff88007bbe3000
> Sep 15 15:29:36 jay-t60p kernel: FS:  00007f605bee46f0(0000)
> GS:ffff880005f00000(0000) knlGS:0000000000000000
> Sep 15 15:29:36 jay-t60p kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
> 000000008005003b
> Sep 15 15:29:36 jay-t60p kernel: CR2: 0000000000000000 CR3:
> 000000007acf8000 CR4: 00000000000006e0
> Sep 15 15:29:36 jay-t60p kernel: DR0: 0000000000000000 DR1:
> 0000000000000000 DR2: 0000000000000000
> Sep 15 15:29:36 jay-t60p kernel: DR3: 0000000000000000 DR6:
> 00000000ffff0ff0 DR7: 0000000000000400
> Sep 15 15:29:36 jay-t60p kernel: Process irqbalance (pid: 2478,
> threadinfo ffff880037a80000, task ffff8800376d8280)
> Sep 15 15:29:37 jay-t60p rpc.statd[2588]: statd running as root. chown
> /var/lib/nfs/sm to choose different user
> Sep 15 15:29:37 jay-t60p sm-notify[2596]: Already notifying clients; Exiting!
> Sep 15 15:29:36 jay-t60p modem-manager: Loaded plugin MBM
> Sep 15 15:29:36 jay-t60p kernel: Stack:
> Sep 15 15:29:37 jay-t60p kernel:  ffffffff8152b7d0 ffff88007bbe3000
> ffffffff8154a6a8 ffff88007c7aa2d8
> Sep 15 15:29:37 jay-t60p kernel: <0> ffffffff81556620 ffff880037a81f48
> ffff880037a81e88 ffffffff81186937
> Sep 15 15:29:37 jay-t60p kernel: <0> ffff88007c7aa2d8 fffffffffffffffb
> ffff880037a81ea8 ffffffff811fbff6
> Sep 15 15:29:37 jay-t60p kernel: Call Trace:
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff81186937>] local_cpus_show+0x36/0x49
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff811fbff6>] dev_attr_show+0x20/0x44
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff81121741>]
> sysfs_read_file+0xb2/0x131
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff810ce07c>] vfs_read+0xb1/0x187
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff810ce216>] sys_read+0x47/0x70
> Sep 15 15:29:37 jay-t60p modem-manager: Loaded plugin Sierra
> Sep 15 15:29:37 jay-t60p kernel:  [<ffffffff8100b9eb>]
> system_call_fastpath+0x16/0x1b

Looks like a bootstrap issue since is appears as though `local_cpus' is 
being read by some initscript on your T60p and mine doesn't suffer from 
the same problem (it isn't read at all on mine).

CONFIG_DEBUG_PER_CPU_MAPS should be able to diagnose it when you get back 
from traveling.
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