[Qemu-devel] [Bug 818647] Re: Getting segmentation fault when trying to boot FreeBSD

[T. Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/818647

Title:
  Getting segmentation fault when trying to boot FreeBSD

Status in QEMU:
  Fix Released

Bug description:
  address@hidden:~/bin/qemu/qemu$ git log | head -1
  commit c886edfb851c0c590d4e77f058f2ec8ed95ad1b5

  address@hidden:~/o/freebsd/sys/boot/i386$ qemu-system-sparc64 --version
  QEMU emulator version 0.15.50, Copyright (c) 2003-2008 Fabrice Bellard

  address@hidden:~/o/freebsd/sys/boot/i386$ uname -a
  Linux wkoszek 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:05:41 UTC 2011 
i686 i686 i386 GNU/Linux

  Qemu built with default settings (./configure --prefix=<path> && make
  && make install)

  I run FreeBSD ISO image:
  /home/wkoszek/bin/qemu-dynamic/bin/qemu-system-sparc64 -m 1024 -cdrom 
~/Pulpit/iso/FreeBSD-7.4-RELEASE-sparc64-bootonly.iso -hda 
~/Pulpit/iso/freebsd_sparc64.qcow2 -nographic -boot d

  Configuration device id QEMU version 1 machine id 0
  kernel cmdline 
  CPUs: 1 x SUNW,UltraSPARC-IIi
  UUID: 00000000-0000-0000-0000-000000000000
  Welcome to OpenBIOS v1.0 built on Jul 20 2011 21:17
    Type 'help' for detailed information
  Trying cdrom:f...
  Not a bootable ELF image
  Loading a.out image...
  Loaded 7680 bytes
  entry point is 0x4000

  Jumping to entry point 0000000000004000 for type 0000000000000005...
  switching to new context: entry point 0x4000 stack 0x00000000ffe86b49
   
  >> FreeBSD/sparc64 boot block
     Boot path:   cdrom:f
     Boot loader: /boot/loader
  Consoles: Open Firmware console  

  Booting with sun4u support.
  Boot path set to cdrom:a

  FreeBSD/sparc64 bootstrap loader, Revision 1.0
  (address@hidden, Fri Feb 18 05:38:31 UTC 2011)
  bootpath="cdrom:a"
  Loading /boot/defaults/loader.conf 
  /boot/kernel/kernel data=0x8d1f48+0x82f88 syms=[0x8+0x88ec0+0x8+0x76966]
  |
  Unimplemented service milliseconds ([0] -- [1])
  Hit [Enter] to boot immediately, or any other key for command prompt.
  Unimplemented service milliseconds ([0] -- [1])
  Unimplemented service milliseconds ([0] -- [1])
  Unimplemented service milliseconds ([0] -- [1])
  Unimplemented service milliseconds ([0] -- [1])
  Unimplemented service milliseconds ([0] -- [1])
  Unimplemented service milliseconds ([0] -- [1])

  I press CTRL + C and I get out of the looped warning about
  "unimplemented service". Then I see:

  Type '?' for a list of commands, 'help' for more detailed help.
  OK boot
  jumping to kernel entry at 0xc0078000.
  BOOTUnhandled Exception 0x0000000000000034
  PC = 0x00000000c0637454 NPC = 0x00000000c0637458

  I wanted to start FreeBSD debugging here - I pressed 'CTRL+A c', I was
  dropped to the monitor.

  FRom the monitor I typed:

  Stopping execution
  QEMU 0.15.50 monitor - type 'help' for more information
  (qemu) x 0xc0078000
  00000000c0078000: Cannot access memory
  (qemu) x 0x00000000c0637454 
  00000000c0637454: Cannot access memory
  (qemu) x 0x00000000c0637458
  00000000c0637458: Cannot access memory
  (qemu) xp 0xc0078000
  Segmentation fault

  IMO it shouldn't have crashed.

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