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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
<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:
<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
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