linux-kernel - Re: mmotm 2009-09-09-22-56 uploaded

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Message-ID: <alpine.DEB.1.00.0909180237350.22490@chino.kir.corp.google.com>
Date:	Fri, 18 Sep 2009 02:38:09 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Suresh Jayaram <sureshjayaram@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Jin Dongming <jin.dongming@...css.fujitsu.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: mmotm 2009-09-09-22-56 uploaded

On Tue, 15 Sep 2009, David Rientjes wrote:

> > 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.
> 

Ingo reported this on 2.6.31-tip, so it doesn't actually appear to be 
related to mmotm.
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