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+[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!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