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bug report in parted 3.0 with WD2,5TB GPT

From: Valentin Schulte
Subject: bug report in parted 3.0 with WD2,5TB GPT
Date: Sun, 08 Jan 2012 22:24:26 +0100

sorry, if this is not the best way to report it, but i want to inform you about 
an issue that parted reported me.

--- report ---

GNU Parted 3.0
Using /dev/sdc
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                                
Error: Invalid argument during seek for read on /dev/sdc                  
Retry/Ignore/Cancel? i                                                    
Error: The backup GPT table is corrupt, but the primary appears OK, so that 
will be used.
OK/Cancel? OK                                                             
Backtrace has 8 calls on stack:
  8: /usr/lib/libparted.so.1(ped_assert+0x31) [0x7f61f43124e1]
  7: /usr/lib/libparted.so.1(+0x26550) [0x7f61f432a550]
  6: /usr/lib/libparted.so.1(ped_disk_new+0x75) [0x7f61f43189a5]
  5: parted() [0x406b89]
  4: parted(interactive_mode+0xf3) [0x40c653]
  3: parted(main+0xd9f) [0x408d4f]
  2: /lib/libc.so.6(__libc_start_main+0xfd) [0x7f61f3b2fbbd]
  1: parted() [0x405919]

You found a bug in GNU Parted! Here's what you have to do:

Don't panic! The bug has most likely not affected any of your data.
Help us to fix this bug by doing the following:

Check whether the bug has already been fixed by checking
the last version of GNU Parted that you can find at:


Please check this version prior to bug reporting.

If this has not been fixed yet or if you don't know how to check,
please visit the GNU Parted website:


for further information.

Your report should contain the version of this release (3.0)
along with the error message below, the output of

        parted DEVICE unit co print unit s print

and the following history of commands you entered.
Also include any additional information about your setup you
consider important.

Assertion (last_usable <= disk->dev->length) at gpt.c:727 in function 
_parse_header() failed.


--- report ---

--- dmesg ---

[ 8177.255843] scsi 11:0:0:0: Direct-Access     WDC WD25 EZRX-00MMMB0          
PQ: 0 ANSI: 2
[ 8177.256147] sd 11:0:0:0: Attached scsi generic sg3 type 0
[ 8177.257199] sd 11:0:0:0: [sdc] 588813872 512-byte logical blocks: (301 
GB/280 GiB)
[ 8177.259447] sd 11:0:0:0: [sdc] Write Protect is off
[ 8177.259450] sd 11:0:0:0: [sdc] Mode Sense: 38 00 00 00
[ 8177.259452] sd 11:0:0:0: [sdc] Assuming drive cache: write through
[ 8177.262572] sd 11:0:0:0: [sdc] Assuming drive cache: write through
[ 8177.280078]  sdc: unknown partition table
[ 8177.283200] sd 11:0:0:0: [sdc] Assuming drive cache: write through
[ 8177.283203] sd 11:0:0:0: [sdc] Attached SCSI disk

--- dmesg ---

"parted DEVICE unit co print unit s print" gives exactly the same result.
Disk is WD25EZRX (Western Digital 2,5TB) connected through USB.

I hope you can do something with that.
You can ask for more information if you want.
 Best regards,
   Valentin Schulte

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