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[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]

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[[!tag open_issue_gnumach]]

Running GNU Mach in VirtualBox crashes during initialization.

IRC, freenode, #hurd, 2011-08-15

    <BlueT_> HowTo Reproduce: 1) Use `reboot` to reboot the system.  2) Once
      you see the Grub menu, turn off the debian hurd box.  3) Let the box boot
      normally, and wait for the error/crash/reboot. 4) The error/crash will
      happen twice and it's reboot automatically. The 3rd boot will success.

    <BlueT_> root@dhurd:/boot# addr2line -f -e gnumach-1.3.99-486-dbg-copy 0x106c93 0x1556a5 0x152c54
    <BlueT_> copyoutmsg
    <BlueT_> /home/buildd/build/chroot-sid/home/buildd/byhand/gnumach/build-dbg/../i386/i386/locore.S:1289
    <BlueT_> exec_load
    <BlueT_> /home/buildd/build/chroot-sid/home/buildd/byhand/gnumach/build-dbg/../kern/elf-load.c:80
    <BlueT_> user_bootstrap
    <BlueT_> /home/buildd/build/chroot-sid/home/buildd/byhand/gnumach/build-dbg/../kern/bootstrap.c:756

    i386/i386/locore.S:1289 is 

            movl    $USER_DS,%eax           /* use user data segment for accesses */
    =>      mov     %ax,%es

    State is

    cs: 0x8
    ds: 0x10
    es: 0x10
    fs: 0
    gs: 0
    ss: 0x10
    eax: 0x1f
    ecx: 0x8048000
    edx: 0x15fb7f
    ebx: 0x1001000
    esp: 0x75e47e08
    ebp: 0x75e47e6c
    esi: 0x1002000
    edi: 0x8048000
    eip: 0x106c93
    efl: 0x10206

    <youpi> oh, wait, it's not even the data access which poses problem
    <youpi> but the use of $USER_DS
    <youpi> ew
    <youpi> looks like a gdt initialization emulation issue in virtualbox...


    <BlueT_> just found that at the second crash, the address is different
    <BlueT_> 2nd time:
    <BlueT_> addr2line -f -e gnumach-1.3.99-486-dbg-copy 0x1068bd 0x152c74
    <BlueT_> _kret_popl_es
    <BlueT_> /home/buildd/build/chroot-sid/home/buildd/byhand/gnumach/build-dbg/../i386/i386/locore.S:527
    <BlueT_> user_bootstrap
    <BlueT_> /home/buildd/build/chroot-sid/home/buildd/byhand/gnumach/build-dbg/../kern/bootstrap.c:765

    i386/i386/locore.S:527 is:

    _return_from_kernel:
    _kret_popl_gs:
            popl    %gs                     /* restore segment registers */
    _kret_popl_fs:
            popl    %fs
    _kret_popl_es:
    =>      popl    %es
    _kret_popl_ds:

    cs: 0x8
    ds: 0x10
    es: 0x10
    fs: 0
    gs: 0
    ss: 0x10
    eax: 0x106c95
    ecx: 0x6aab096c
    edx: 0x106cec
    ebx: 0x75e47f04
    esp: 0x75e47f0c
    ebp: 0x75e47fac
    esi: 0x75e47f8c
    edi: 0x7fffff3c
    eip: 0x1068bd
    efl: 0x10216

    <youpi> looks again like a $USER_DS issue
    <youpi> what's interesting is that that one means that $USER_DS did load in
      %es fine at least once 
    <youpi> and it's the reload that fails