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Old 11-23-2011, 02:14 AM
Jonathan Nieder
 
Default Bug#649673: fails to boot - immediate oops

Hi,

cfr wrote:

> Kernel oops. Boot failed. Turned machine off at switch. Restarted
> choosing to boot the 2.6 kernel at the second prompt.
[...]
> I don't have access to a digital camera right now though I can try to
> get a shot with one if required. I don't have any idea how to use a
> serial or net console - or even what these are. If somebody points me to
> a document, I will try to figure it out, though.

Thanks! See [1].

A serial console would presumably require a USB-to-serial converter,
so that's likely to be more fussy[2].

[1] http://www.kernel.org/doc/Documentation/networking/netconsole.txt
[2] http://www.kernel.org/doc/Documentation/serial-console.txt



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Old 11-23-2011, 10:59 PM
Jonathan Nieder
 
Default Bug#649673: fails to boot - immediate oops

retitle 649673 [powerpc] immediate oops on boot (Kernel access of bad area, sig: 11)
severity 649673 important
quit

Clea F. Rees wrote:
> On 23 November 2011 03:14, Jonathan Nieder <jrnieder@gmail.com> wrote:
>> cfr wrote:

>>> Kernel oops. Boot failed. Turned machine off at switch. Restarted
>>> choosing to boot the 2.6 kernel at the second prompt.
[...]
> In the meantime, I took a picture when it went oops today. I was
> watching a bit more carefully this time. I get to the login screen and
> then I get the panic.

Perfect. Transcription, for reference (no usable instruction dump or
backtrace, alas):

| Oops: Kernel access of bad area, sig: 11 [#1]
| PowerMac
| Modules linked in: rfcomm(+) aes_generic cpufreq_stats cpufre
| ufreq_userspace binfmt_misc fuse xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_i
| e xt_state ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_b
| ag_ipv4 nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables nls_
| luetooth joydev ams appletouch arc4 input_polldev snd_aoa_codec_tas evdev b4
| 80211 ttm snd_aoa_i2sbus snd_pcm drm_kms_helper snd_page_alloc snd_seq snd_t
| nd_aoa_soundbus cfg80211 rfkill ext4 mbcache jbd2 crc16 sg sd_mod sr_mod crc
| echi_hcd scsi_mod firewire_ohci sungem firewire_core ssb usbcore sungem_phy
| : scsi_wait_scan]
| NIP: 00000000 LR: 00000000 CTR: 00000000
| REGS: f439bee0 TRAP: 0000 Not tainted (3.0.0-1-powerpc)
| MSR: 00000000 <> CR: 00000000 XER: 00000000
| TASK = e4c05130[5113] 'modprobe' THREAD: e4c38000
[...]
| Call Trace:
| Instruction dump:
| XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
| XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 60000000 XXXXXXXX XXXXXXXX
| Oops: nonrecoverable exception, sig: 9 [#2]
| PowerMac

> The attached is the best of the screenshots I
> took. I'm not sure why it says the kernel is 3.0.0-1? If that's what
> it is saying?

Yes, it says it is booted into a v3.0.y kernel. Maybe your bootloader
didn't notice the updated installed image.

> I take it the idea with the serial/net console to send the messages
> from the kernel during boot to another device which will record them
> instead of/as well as to the screen. So in the case of the net
> console, that would be another machine on the network?

Exactly.

Thanks again.
Jonathan



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Old 11-23-2011, 11:08 PM
Jonathan Nieder
 
Default Bug#649673: fails to boot - immediate oops

Clea F. Rees wrote:

> | TASK = e4c05130[5113] 'modprobe' THREAD: e4c38000

So, this good news. It means it might be possible to track down which
module is responsible for the oops by entering a minimal environment
and loading them with "modprobe" one at a time. See the "break"
parameter in the initramfs-tools(8) manual and [1] for hints.

> Yes, it says it is booted into a v3.0.y kernel. Maybe your bootloader
> didn't notice the updated installed image.

This part would still be good to figure out. The "printk_delay"
kernel commandline parameter might be helpful if the early messages
scroll past too quickly.

Thanks again for your help and patience.

Jonathan

[1] http://wiki.debian.org/InitramfsDebug



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Old 02-15-2012, 08:51 PM
Jonathan Nieder
 
Default Bug#649673: fails to boot - immediate oops

tags 649673 + moreinfo
# ??
found 649673 linux-2.6/3.1.1-1
quit

Hi,

Jonathan Nieder wrote:
> Clea F. Rees wrote:

>> | TASK = e4c05130[5113] 'modprobe' THREAD: e4c38000
>
> So, this good news. It means it might be possible to track down which
> module is responsible for the oops by entering a minimal environment
> and loading them with "modprobe" one at a time. See the "break"
> parameter in the initramfs-tools(8) manual and [1] for hints.

Ping. Did you get a chance to try this?

>> Yes, it says it is booted into a v3.0.y kernel. Maybe your bootloader
>> didn't notice the updated installed image.
>
> This part would still be good to figure out. The "printk_delay"
> kernel commandline parameter might be helpful if the early messages
> scroll past too quickly.

Finding out which kernel is booting would be interesting, too.

Happy new year,
Jonathan



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