Re: [uml-devel] Recent patches of note

[William Stearns <wstearns@pobox.com>]

Good afternoon, all,

On Mon, 20 Jun 2005, Jeff Dike wrote:

> On Thu, Jun 16, 2005 at 03:36:24PM -0700, Anthony Brock wrote:
>> Second, I'm once again enountering problems with launch the UML instance. It likes to hang at:
>>
>>
>> Checking that ptrace can change system call numbers...OK
>> Checking syscall emulation patch for ptrace...OK
>> Checking advanced syscall emulation patch for ptrace...OK
>> Checking if syscall restart handling in host can be skipped...OK
>> Checking for the skas3 patch in the host:
>>   - /proc/mm...found
>>   - PTRACE_FAULTINFO...found
>>   - PTRACE_LDT...found
>> Checking PROT_EXEC mmap in /tmp...OK
>
> I remembered what this was about.  Disable CONFIG_I8042, under -
> 	UML-specific options
> 	Input device support
> 	Hardware I/O ports
> 	i8042 PC Keyboard controller
>
> This is a UML bug which I haven't tracked down yet.

 	Just for reference, that's CONFIG_SERIO_I8042 on 2.6 kernels.
 	I disabled that on the kernel that was giving me the same hang 
point on x86_64 and....  same hang.  I turned off all the other hardware 
options in that menu (serial port, game port) and.... hmmm.  A kernel that 
was at least successfully building before is now:

   CC      arch/um/sys-x86_64/signal.o
arch/um/sys-x86_64/signal.c: In function 'setup_signal_stack_si':
arch/um/sys-x86_64/signal.c:171: error: invalid lvalue in assignment
make[1]: *** [arch/um/sys-x86_64/signal.o] Error 1
make: *** [arch/um/sys-x86_64] Error 2

 	The line in question is the ((unsigned char... :

         frame = (struct rt_sigframe __user *)
                 round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
         ((unsigned char *) frame) -= 128;

         if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
                 goto out;


 	I'm reasonably sure this showed up because I upgraded to fc4 at 
the end of last week - sorry about that.
 	.config attached.
 	Cheers,
 	- Bill

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William Stearns (wstearns@pobox.com).  Mason, Buildkernel, freedups, p0f,
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