[bug #25614] Floating-point exception in grub-install

[David Abrahams]

URL:
  <http://savannah.gnu.org/bugs/?25614>

                 Summary: Floating-point exception in grub-install
                 Project: GNU GRUB
            Submitted by: bewst
            Submitted on: Tue 17 Feb 2009 07:49:12 PM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: svn-1996
         Reproducibility: Every Time
         Planned Release: 

    _______________________________________________________

Details:

This is with my attempted port to ubuntu package; I haven't tried the raw
source.

<pre>
Starting program: /usr/sbin/grub-setup --directory=/boot/grub
--device-map=/boot/grub/device.map '(hd0)'

Program received signal SIGFPE, Arithmetic exception.
0x000000000040642c in grub_divmod64 (n=<value optimized out>, d=0,
r=0x7fffeb27c8a0) at /home/dave/src/grub2/grub2-1.97+svn1996/kern/misc.c:609
(gdb) bt
#0  0x000000000040642c in grub_divmod64 (n=<value optimized out>, d=0,
r=0x7fffeb27c8a0) at /home/dave/src/grub2/grub2-1.97+svn1996/kern/misc.c:609
#1  0x000000000041a28a in grub_raid_read (disk=<value optimized out>,
sector=<value optimized out>, size=8, buf=0x26140a0 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/raid.c:228
#2  0x0000000000405272 in grub_disk_read (disk=0x2550180, sector=30728448,
offset=0, size=4096, buf=0x25fff60 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/kern/disk.c:418
#3  0x000000000041b1ea in grub_lvm_read (disk=<value optimized out>,
sector=30728064, size=4096, buf=0x25fff60 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/lvm.c:187
#4  0x0000000000405272 in grub_disk_read (disk=0x254f760, sector=30728064,
offset=0, size=4096, buf=0x7fffeb27ca30 "") at
/home/dave/src/grub2/grub2-1.97+svn1996/kern/disk.c:418
#5  0x000000000041ae8e in grub_mdraid_detect (disk=0x254f760,
array=0x7fffeb27da50) at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/mdraid_linux.c:174
#6  0x000000000041abc3 in hook (name=<value optimized out>) at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/raid.c:618
#7  0x0000000000404e07 in iterate_disk (disk_name=0x3a9c2 <Address 0x3a9c2
out of bounds>) at /home/dave/src/grub2/grub2-1.97+svn1996/kern/device.c:90
#8  0x000000000041b045 in grub_lvm_iterate (hook=0x7fffeb27dc38) at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/lvm.c:53
#9  0x0000000000404f16 in grub_disk_dev_iterate (hook=0x7fffeb27dc38) at
/home/dave/src/grub2/grub2-1.97+svn1996/kern/disk.c:209
#10 0x0000000000404c4d in grub_device_iterate (hook=<value optimized out>) at
/home/dave/src/grub2/grub2-1.97+svn1996/kern/device.c:135
#11 0x000000000041aab4 in grub_raid_scan_device (head_only=<value optimized
out>) at /home/dave/src/grub2/grub2-1.97+svn1996/disk/raid.c:641
#12 0x000000000041c14d in grub_fini_all () at grub_setup_init.c:73
#13 0x000000000040272f in main (argc=<value optimized out>,
argv=0x7fffeb27ddf8) at
/home/dave/src/grub2/grub2-1.97+svn1996/util/i386/pc/grub-setup.c:740
(gdb) p d
$1 = 0
#1  0x000000000041a28a in grub_raid_read (disk=<value optimized out>,
sector=<value optimized out>, size=8, buf=0x26140a0 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/raid.c:228
(gdb) p array->total_devs
$2 = 0
(gdb) p array
$3 = (struct grub_raid_array *) 0x254f460
(gdb) p *array
$4 = {number = 39125504, level = 0, layout = 39084544, total_devs = 0,
chunk_size = 128, disk_size = 9767296, index = 4, uuid_len = 16, uuid =
0x2546100 "T\002", name = 0x254f5b0 "raid6-root", nr_devs = 8, device =
{0x254fab0, 0x254fc70, 0x254fe30, 0x254ff20, 0x2546250, 0x2546180, 0x254f670,
0x254f760, 0x0 <repeats 24 times>}, next = 0x150}
#2  0x0000000000405272 in grub_disk_read (disk=0x2550180, sector=30728448,
offset=0, size=4096, buf=0x25fff60 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/kern/disk.c:418
#1  0x000000000041a28a in grub_raid_read (disk=<value optimized out>,
sector=<value optimized out>, size=8, buf=0x26140a0 "`\005 \177") at
/home/dave/src/grub2/grub2-1.97+svn1996/disk/raid.c:228
(gdb) 
</pre>

It's worth noting that this is a RAID6 array.  The code as I read it appears
to think it's RAID0.

<pre>
sudo /usr/sbin/grub-setup -v --directory=/boot/grub
--device-map=/boot/grub/device.map '(hd0)'
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd1 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd2 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd3 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd4 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd5 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd6 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd7 is 976773168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: the size of hd8 is 488397168
grub-setup: info: changing current directory to /dev
grub-setup: info: changing current directory to snd
grub-setup: info: changing current directory to block
grub-setup: info: changing current directory to char
grub-setup: info: changing current directory to shm
grub-setup: info: changing current directory to pts
grub-setup: info: changing current directory to net
grub-setup: info: changing current directory to raid6
grub-setup: info: getting the size of /boot/grub/boot.img
grub-setup: info: reading /boot/grub/boot.img
grub-setup: info: getting the size of /boot/grub/boot.img
grub-setup: info: getting the size of /boot/grub/core.img
grub-setup: info: reading /boot/grub/core.img
grub-setup: info: getting the size of /boot/grub/core.img
grub-setup: info: the size of hd0 is 976773168
grub-setup: info: setting the root device to `md0'
grub-setup: info: dos partition is -2, bsd partition is -2
grub-setup: info: will embed the core image at sector 0x1
Floating point exception
</pre>






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