From: Jan Kara <jack@suse.cz>
To: John Twideldum <twideldums_throwaway@gmx.at>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 3.12-rc5 and overwritten partition table
Date: Tue, 29 Oct 2013 21:12:15 +0100 [thread overview]
Message-ID: <20131029201215.GD9568@quack.suse.cz> (raw)
In-Reply-To: <trinity-ee0bd2b5-ce28-4895-8c2a-2f60f40e49f4-1383046621263@3capp-gmx-bs07>
On Tue 29-10-13 12:37:01, John Twideldum wrote:
> Hi...
>
> I have a shiny new Haswell notebook (Lenovo T440s), where with 3.11 processor power
> management didn't work, so I got 3.12-rc5 installed.
> Worked fine for a few days, then today it no longer boots and inspection yields...
>
> # dd if=/dev/sda count=1 |od -t c |tr -d " "
> 512 bytes (512 B) copied, 0.00115806 s, 442 kB/s
> 0000000 13.00000\nalsa:hw
> 0000020 C0D0\t99.00000\nal
> 0000040 sa:hwC0D3\t99.000
> 0000060 00\nbacklight:acp
> 0000100 i_video0\t73.0000
> 0000120 0\nbacklight:acpi
> 0000140 _video0-power\t10
> 0000160 0.00000\nbackligh
> 0000200 t:intel_backligh
> 0000220 t\t0.00000\nbackli
> 0000240 ght:intel_backli
> 0000260 ght-power\t0.0000
> 0000300 0\ncpu-consumptio
> 0000320 n\t0.00000\ncpu-wa
> 0000340 keups\t875.00000\n
> 0000360 disk-operations\t
> 0000400 0.00000\ndisk-ope
> 0000420 rations-hard\t0.0
> 0000440 0000\neth0-link-1
> 0000460 00\t0.00000\neth0-
> 0000500 link-1000\t0.0000
> 0000520 0\neth0-link-high
> 0000540 \t0.00000\neth0-pa
> 0000560 ckets\t0.00000\net
> 0000600 h0-powerunsave\t0
> 0000620 .00000\neth0-up\t0
> 0000640 .00000\ngpu-opera
> 0000660 tions\t134.00000\n
> 0000700radio:hci0\t100.0
> 00007200000\nradio:phy0\t
> 0000740100.00000\nradio:
> 0000760tpacpi_bluetooth
> 0001000
>
> :-(
>
> In order to figure out the reason for this, can you kernel guys maybe
> a) tell me what is that datastructure?
> b) can power management be buggy to cause this - I played with powertop tuneables
> approximately while this happened?
>
> ...and point me to a recovery tool/doc for finding the partitions again,
> "testdisk" tool only found 1 of 3, the least important one at the beginning of
> disk but not the rest :-(
You can always look for fs-specific magic numbers in the superblock. What
filesystems did you use?
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
prev parent reply other threads:[~2013-10-29 20:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-29 11:37 3.12-rc5 and overwritten partition table John Twideldum
2013-10-29 14:57 ` Aw: 3.12-rc5 and overwritten partition table - by powertop? John Twideldum
2013-10-29 20:10 ` Jan Kara
2013-10-29 21:58 ` John Twideldum
2013-10-29 22:20 ` Jan Kara
2013-10-29 22:32 ` John Twideldum
2014-01-21 3:08 ` Robert Hancock
2014-01-23 12:17 ` John Twideldum
2014-01-20 23:22 ` Stefan Agner
2013-10-29 20:12 ` Jan Kara [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20131029201215.GD9568@quack.suse.cz \
--to=jack@suse.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=twideldums_throwaway@gmx.at \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox