Re: [PATCH] ia64: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone_args

[John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>]

On 5/14/20 12:19 PM, Christian Brauner wrote:
> Scratch that. It's even worse. On ia64 it is _invalid_ to pass a NULL
> stack. That's at least what the glibc assembly assumes:
> 
> 	cmp.eq p6,p0=0,in0
> 	cmp.eq p7,p0=0,in1
> 	mov r8=EINVAL
> 	mov out0=in3		/* Flags are first syscall argument.	*/
> 	mov out1=in1		/* Stack address.			*/
> (p6)	br.cond.spnt.many __syscall_error	/* no NULL function pointers */
> (p7)	br.cond.spnt.many __syscall_error	/* no NULL stack pointers */
> 	;;
> 	mov out2=in2		/* Stack size.				*/
> 
> so newer systemd just works by accident on ia64 if at all correctly
> afaict.

Hmm, interesting. I really wasn't aware of that. Thanks for the heads-up.

I'll ask Michael whether he can come up for a solution for that problem.

Maybe that's also why systemd crashes.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
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