Re: getting core dump with grub2-mkconfig on systems with windows7 partitions?? (No windows menu entry?)

[Michael D. Setzer II]

On 9 Mar 2025 at 5:37, Michael D. Setzer II via user wrote:

To:             	Community support for Fedora users 

Date sent:      	Sun, 09 Mar 2025 05:37:13 +1000
Subject:        	Re: getting core dump with grub2-mkconfig on 
systems with windows7
    partitions??
Priority:       	normal
Send reply to:  	[e-mail],
    Community support for Fedora users 

From:           	"Michael D. Setzer II via users" 

Copies to:      	Camina Shell 
,
    "Michael D. Setzer II"
> On 8 Mar 2025 at 13:53, Camina Shell via users wrote:
>
> Subject:        	Re: getting core dump with grub2-mkconfig on 
> systems with windows7
>    partitions??
> To:             	[e-mail]
> Date sent:      	Sat, 08 Mar 2025 13:53:50 -0000
> Send reply to:  	Community support for Fedora users 
>
> From:           	Camina Shell via users 
>
> Copies to:      	Camina Shell 
> > Running os-prober on its own also reveals this seg fault.
> >
> > ❯ sudo os-prober
> > /dev/nvme2n1p1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
> > /usr/libexec/os-probes/50mounted-tests: line 186: 224295 Segmentation fault      (core dumped) grub2-mount "$partition" "$tmpmnt" 2> /dev/null
> > --
>
> Did a test with grub2-probe and it gives same Segmentation fault 
> on nfts partitions. Note book had 9 partitions.
>
> for a in $(cat /proc/partitions | grep sda. | cut -b26-40); do echo -n 
> /dev/$a" " ; grub2-probe -d /dev/$a; done
> /dev/sda1 Segmentation fault (core dumped)
> /dev/sda2 Segmentation fault (core dumped)
> /dev/sda3 Segmentation fault (core dumped)
> /dev/sda4 grub2-probe: error: cannot find a GRUB drive for 
> /dev/sda4.  Check your device.map.
> /dev/sda5 ext2
> /dev/sda6 grub2-probe: error: ../grub-core/kern/fs.c:123:unknown 
> filesystem.
> /dev/sda7 ext2
> /dev/sda8 ext2
> /dev/sda9 ext2
>
> Also, noticed /etc/filesystems and /proc/filesystems don't have ntfs??
>
> Partitions on this notebook.
>
> /dev/sda1            2048   39847935   39845888    19G 27 Hidden 
> NTFS WinRE
> /dev/sda2  *     39847936   40052735     204800   100M  7 
> HPFS/NTFS/exFAT
> /dev/sda3        40052736  379084799  339032064 161.7G  7 
> HPFS/NTFS/exFAT
> /dev/sda4       379084800 1953523711 1574438912 750.8G  5 
> Extended
> /dev/sda5       714633216  716730367    2097152     1G 83 Linux
> /dev/sda6       716732416  724756479    8024064   3.8G 82 Linux 
> swap / Solaris
> /dev/sda7       724758528  835887103  111128576    53G 83 Linux
> /dev/sda8       835889152 1953523711 1117634560 532.9G 83 
> Linux
> /dev/sda9       379086848  714631167  335544320   160G 83 Linux

Actually rebooted machine to check what windows option was 
showing, and found that there was no option to select windows 
from the grub2 menu??
Looking at grub.cfg found.
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

Then manually added this to have it have an option for windows?
The worked fine to boot the windows, but will require manually 
updating grub.cfg after running a grub2-mkconfig or other similar 
process.

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7" {
    insmod ntfs
    set root=(hd0,2)  # Modify this to match your Windows partition
    chainloader +1
}
### END /etc/grub.d/30_os-prober ###

Note both machines had Windows 7 from Acer installed, and don't 
seem to be be EFI setup, so just the regular ntldr setup.

Hadn't booted machine to Windows 7 for a long time, but had 
worked fine in past?
So, issue is bigger than an error message that does make a 
difference?

Thanks.
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> +------------------------------------------------------------+
>  Michael D. Setzer II - Computer Science Instructor (Retired)     
>  mailto:[e-mail]                            
>  mailto:[e-mail]
>  mailto:[e-mail]
>  Guam - Where America's Day Begins                        
>  G4L Disk Imaging Project maintainer 
>  http://sourceforge.net/projects/g4l/
> +------------------------------------------------------------+
>
> -- 
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+------------------------------------------------------------+
 Michael D. Setzer II - Computer Science Instructor (Retired)     
 mailto:[e-mail]                            
 mailto:[e-mail]
 mailto:[e-mail]
 Guam - Where America's Day Begins                        
 G4L Disk Imaging Project maintainer 
 http://sourceforge.net/projects/g4l/
+------------------------------------------------------------+