Re: [Qemu-devel] Sparc32 bash problem solved

[Joerg Platte]

Am Samstag, 27. Mai 2006 21:30 schrieb Blue Swirl:
> For some reason, bash and strace didn't work inside Sparc32 system
> emulator. I finally found the reason by observing strange Linux behaviour
> relating to MMU no-fault mode. No fault mode seems to apply only to
> supervisor accesses, not user ones. The logic was not described like this
> in the manual, thank you very much.

How did you find it?

> Patched Qemu version can run several distro installers which crashed very
> early before. Bash and strace are okay.

Yes, booting a small system with udev works! qemu in graphical mode boots up 
to the login prompt. But unfortunately each character i tried to type in is 
corrupt. Hence, its not possible to log in. In console mode getty causes a 
kernel oops. But it works now much better than before. Many thanks!

regards,
Jörg


INIT: version 2.86 booting
Mounting a tmpfs over /dev...done.
Creating initial device nodes...done.
Activating swap.
System time was Mon May 27 22:12:09 UTC 1974.
Setting the System Clock using the Hardware Clock as reference...
System Clock set. System local time is now Mon May 27 22:12:12 UTC 1974.
Checking all file systems...
fsck 1.37 (21-Mar-2005)
WARNING: Your /etc/fstab does not contain the fsck passno
        field.  I will kludge around things for you, but you
        should fix your /etc/fstab file as soon as you can.

Setting kernel variables ...
... done.
Mounting local filesystems...
Cleaning /tmp /var/run /var/lock.
Starting hotplug subsystem:
   pci
cat: /sys/bus/pci/devices/*/class: No such file or directory
cat: /sys/bus/pci/devices/*/vendor: No such file or directory
cat: /sys/bus/pci/devices/*/device: No such file or directory
cat: /sys/bus/pci/devices/*/subsystem_vendor: No such file or directory
cat: /sys/bus/pci/devices/*/subsystem_device: No such file or directory
Bad PCI agent invocation
   pci      [success]
   usb
   usb      [success]
   isapnp
   isapnp   [success]
   ide
   ide      [success]
   input
   input    [success]
   scsi
modprobe: Can't open dependencies file /lib/modules/2.6.13-sam/modules.dep (No 
such file or directory)
     sd_mod: can't be loaded (for disk)
modprobe: Can't open dependencies file /lib/modules/2.6.13-sam/modules.dep (No 
such file or directory)
     sd_mod: can't be loaded (for disk)
modprobe: Can't open dependencies file /lib/modules/2.6.13-sam/modules.dep (No 
such file or directory)
     sr_mod: can't be loaded (for cdrom)
modprobe: Can't open dependencies file /lib/modules/2.6.13-sam/modules.dep (No 
such file or directory)
     sg: can't be loaded (for cdrom)
   scsi     [success]
done.

Setting the System Clock using the Hardware Clock as reference...
System Clock set. Local time: Mon May 27 22:12:19 UTC 1974

Initializing random number generator...done.
Setting audio parameters...none.
INIT: Entering runlevel: 2
 Unable to handle kernel NULL pointer dereference
tsk->{mm,active_mm}->context = 00000085
tsk->{mm,active_mm}->pgd = fc00bc00
              \|/ ____ \|/
              "@'/ ,. \`@"
              /_| \__/ |_\
                 \__U_/
getty(1041): Oops [#1]
PSR: 040000c4 PC: f01290f0 NPC: f01290f4 Y: 00000000    Not tainted
PC: <tty_wakeup+0x4/0x64>
%G: 00000002 f0036e18  00000001 044000e6  f0036dbc 00000000  fb820000 00000001
%O: ffffffff 00000000  00000000 fb821bf8  00000018 00000007  fb8217c0 f001bb5c
RPC: <__udelay+0x1c/0x24>
%L: ffd0d000 ffd01754  ffd01758 00000020  00000000 ffffffff  fb820000 80028668
%I: 00000000 00066400  fb821924 fb821c10  ff3b373b 00000001  fb821828 f0036e18
Caller[f0036e18]: tasklet_action+0x6c/0xb8
Caller[f0036acc]: __do_softirq+0xa0/0xc4
Caller[f0036b30]: do_softirq+0x40/0x54
Caller[f0005e0c]: t_sec_trap_start_interrupt+0x38/0x5c
Caller[f01096c4]: prom_nbputchar+0xa0/0xb0
Caller[f0109700]: prom_putchar+0x8/0x24
Caller[f0109f6c]: prom_write+0x2c/0x58
Caller[f0109fcc]: prom_printf+0x34/0x48
Caller[f011a298]: promcon_cursor+0xa0/0xdc
Caller[f0138fc8]: set_cursor+0x84/0xb0
Caller[f013c5c8]: con_flush_chars+0x3c/0x50
Caller[f013c3e0]: con_write+0x1c/0x2c
Caller[f012f578]: write_chan+0x228/0x268
Caller[f0129a88]: tty_write+0x16c/0x258
Caller[f006d130]: vfs_write+0xa8/0x11c
Caller[f006d238]: sys_write+0x30/0x64
Caller[f001b83c]: syscall_is_too_hard+0x34/0x40
Caller[00011cd8]: 0x11cd8
Instruction DUMP: 81c3e008  90023fe7  9de3bf98 <c20620b8> 80886020  12800006  
b2102001  b0062934  b4102001
Kernel panic - not syncing: Aiee, killing interrupt handler!
 <0>Rebooting in 10 seconds..<1>Unable to handle kernel NULL pointer 
dereference