[bug #48685] update-grub triggers filesystem server panics

[Brent Baccala]

URL:
  <http://savannah.gnu.org/bugs/?48685>

                 Summary: update-grub triggers filesystem server panics
                 Project: The GNU Hurd
            Submitted by: baccala
            Submitted on: Wed 03 Aug 2016 07:01:57 AM GMT
                Category: Hurd
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Reproducibility: Every Time
              Size (loc): None
         Planned Release: None
                  Effort: 0.00
Wiki-like text discussion box: 

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Details:

I'm running Mach/Hurd in qemu/kvm, on a Linux 4.4.0 host (Ubuntu 16.04).  Mach
is 1.7+git20160607-486-dbg; the Hurd is from debian-hurd-20160325.

I always get panics when I run update-grub:


ext2fs: /dev/hd0s2: panic: main: device too small for superblock (1024 bytes)
/hurd/fatfs: Invalid number of bytes per sector
/hurd/crash: /hurd/iso9660fs --ro /dev/hd0s2(1432) crashed, signal {no:11,
code:1, error:1}, exception {1, code:1, subcode:241664}, PCs: {0x804aa5c,
0x11254fc, 0x11254fc, 0x10ccb10, 0x10ccb10}, killing task.


Here's what update-grub is reporting:


root@debian:~# update-grub
Generating grub configuration file ...
Warning: Requested serial terminal but GRUB_SERIAL_COMMAND is unspecified.
Default parameters will be used.
Found GNU Mach: /boot/gnumach-1.6-486.gz
Found GNU Mach: /boot/gnumach-1.7-486-dbg.gz
Found Hurd module: /hurd/ext2fs.static
Found Hurd module: /hurd/exec
done
root@debian:~#


/dev/hd0s2 is the extended partition:


Device                    Boot   Start     End Sectors  Size Id Type
debian-hurd-20160325.img1         2048 5787647 5785600  2.8G 83 Linux
debian-hurd-20160325.img2      5789694 6143999  354306  173M  5 Extended
debian-hurd-20160325.img5      5789696 6143999  354304  173M 82 Linux swap /
Solaris


Looks to me like it's doing something to the extended partition, which seems
strange, and then bad things happen.





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