Re: grub-probe gets a segfault

[Isaac M. Marcos]

El Friday 09 May 2008 16:26:28 Pavel Roskin escribió:
> On Fri, 2008-05-09 at 12:13 -0430, Isaac M. Marcos wrote:
> > > Neither could I :-(
> >
> > It does not happen in other two AMD64 machines here!!
> > Only on this one.
>
> That confirms my suspicion that the problem is not related to any x86_64
> issues.
>
> I checked the bug history more carefully, and I think that rlocn->offset
> may be correct.  92672 is 0x16a00, which is a nice rounded number.
>
> If q is out of bounds, it probably means that mda_size was less than
> 0x16a00.  Could you please print mda_size in the debugger?

Program received signal SIGSEGV, Segmentation fault.
0x0000000000421b7c in grub_lvm_scan_device (name=0x638210 "hd1,5") 
at /home/immf/grub2-1.96+20080429/disk/lvm.c:305
305     /home/immf/grub2-1.96+20080429/disk/lvm.c: No such file or directory.
        in /home/immf/grub2-1.96+20080429/disk/lvm.c
(gdb) print mda_size
$1 = 192512

not what you though :-(

>
> Also, pvck should display the metadata size.  Please run this:
>
> pvck /dev/sda6

$ sudo pvck /dev/sda6
  Device /dev/sda6 not found (or ignored by filtering).

But fdisk reports the disks:

$ sudo fdisk -l
Disco /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Disk identifier: 0x680c4421
Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/sda1   *           1          26      208813+  83  Linux
/dev/sda2              27         153     1020127+  83  Linux
/dev/sda3             154         231      626535   82  Linux swap / Solaris
/dev/sda4             232       14593   115362765    5  Extendida
/dev/sda5             232        3396    25422831   fd  Linux raid autodetect
/dev/sda6            3397        6561    25422831   fd  Linux raid autodetect
/dev/sda7            6562        9726    25422831   fd  Linux raid autodetect
/dev/sda8            9727       14593    39094146   8e  Linux LVM
[ some other disks ....]

> What's the metadata size?  It is the same as mda_size should by gdb?

It does not seem so!!


------------------ with cvs version -------------------------------
> That's how to check out GRUB from CVS:
> cvs -d :pserver:address@hidden:/cvsroot/grub co grub2
done
> To build it, use:
> ./configure
> make
done OK,

/_____________________________________
# ./grub-probe -t device /
Violación de segmento

# gdb ./grub-probe
GNU gdb 6.7.1-debian
Copyright (C) 2007 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) run -t device /
Starting program: /home/immf/DescargaFirefox/grub-cvs/grub2/grub-probe -t 
device /

Program received signal SIGSEGV, Segmentation fault.
grub_lvm_scan_device (name=0x62d1f0 "hd1,5") at disk/lvm.c:305
305       while (*q != ' ')
(gdb) print q
$1 = 0x780000 <Address 0x780000 out of bounds>
(gdb) print metadatabuf
$2 = <value optimized out>
(gdb) print rlocn->offset
No symbol "rlocn" in current context.
(gdb) print mda_size
$3 = <value optimized out>
(gdb)                         
_____________________________________________/
cvs version does not contain debug symbols?
Is this a useful "line of work"?

-- 
Isaac M. Marcos
GPG key 0xC9045C1B
5633 ECAF 44B1 8A5D 9371 DCDA 4620 A016 C904 5C1B

The only place success comes before work is in the dictionary.
VINCE LOMBARDI