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[[!tag open_issue_gnumach]]

`/dev/hd2` is 2 GiB in size (backed by LVM), unformatted.

    # mkfs.ext2 -o hurd /dev/hd2
    mke2fs 1.41.7 (29-June-2009)
    hd2 count 1
    re-open, hd2 count 2
    ext2fs_check_if_mount: Can't check if filesystem is mounted due to missing mtab file while determining whether /dev/hd2 is mounted.
    re-open, hd2 count 3
    re-open, hd2 count 4
    re-open, hd2 count 5
    Filesystem label=
    OS type: Hurd
    Block size=4096 (log=2)
    Fragment size=4096 (log=2)
    131072 inodes, 524288 blocks
    26214 blocks (5.00%) reserved for the super user
    First data block=0
    Maximum filesystem blocks=536870912
    16 block groups
    32768 blocks per group, 32768 fragments per group
    8192 inodes per group
    Superblock backups stored on blocks: 
            32768, 98304, 163840, 229376, 294912
    
    Assertion `copy->size <= PAGE_SIZE' failed in file "../gnumach-1-branch-Xen-branch/xen/block.c", line 536
    Kernel Breakpoint trap, eip 0x20020a77
    Stopped at  0x20020a76: int     $3
    db> trace
    0x20020a76(2006abc1,2006ba03,2006782c,218,2e2be8d4)
    0x20020ace(2006ba03,2006782c,218,2e3629a0,32000)
    0x2003e9d5(2de04764,2e2be0b8,12,0,3fff80)
    0x200476e6(2de5ad54,2e2db010,2e30a9a0,2de3a854,2de5ad44)
    0x20021ed4(2de5ad44,2e2bb2e0,2e2bb2a0,0,0)
    0x2005309d(129b8f0,3,38,28,e)
    0x20006838(129b8f0,3,38,28,e)
    >>>>> user space <<<<<


    $ addr2line -i -f -e /boot/gnumach-xen 0x20020a76 0x20020ace 0x2003e9d5 0x200476e6 0x20021ed4 0x2005309d 0x20006838
    Debugger
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/../gnumach-1-branch-Xen-branch/kern/debug.c:105
    Assert
    ??:0
    device_write
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/../gnumach-1-branch-Xen-branch/xen/block.c:537
    _Xdevice_write
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/device/device.server.c:253
    ipc_kobject_server
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/../gnumach-1-branch-Xen-branch/kern/ipc_kobject.c:201
    mach_msg_trap
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/../gnumach-1-branch-Xen-branch/ipc/mach_msg.c:1367
    mach_call_call
    /home/tschwinge/tmp/gnumach/gnumach-1-branch-Xen-branch.build/../gnumach-1-branch-Xen-branch/i386/i386/locore.S:1083