Re: Xen 4.7.0 boot PANIC on kernel 4.7.0-4 + UEFI ?

[lists@ssl-mail.com]

On Wed, Jul 27, 2016, at 11:36 AM, lists@ssl-mail.com wrote:
> On Wed, Jul 27, 2016, at 11:28 AM, Andrew Cooper wrote:
> > > I'm not sure if that's good enough.
> > 
> > Sadly not.  The debug symbols need to be specific to the exact binary
> > you booted.
> > 
> > Any change in the compilation will result in the translation being
> > useless.  What addr2line is doing is saying "which specific bit of
> > source code did the compiler/linker end up putting at $X".
> 
> Got it.  Weird that they don't put the .debuginfo rpms in there.  While I was searching around kernel bug reports over at the distro there's lots of posts telling people to debug.  Not sure then how you do it without the debug symbols.
> 
> Guess you have to build your own kernel.

I got my hands on a 'matched set'

	rpm -qa kernel-default\*
		kernel-default-4.7.0-5.1.x86_64
		kernel-default-devel-4.7.0-5.1.x86_64
		kernel-default-debuginfo-4.7.0-5.1.x86_64

reboot to Xen, still crashes

		(XEN) [2016-07-28 00:13:18] ----[ Xen-4.7.0_08-452  x86_64  debug=n  Tainted:    C ]----
		(XEN) [2016-07-28 00:13:18] CPU:    0
>>>		(XEN) [2016-07-28 00:13:18] RIP:    e033:[<ffffffff81f63eb0>]
		(XEN) [2016-07-28 00:13:18] RFLAGS: 0000000000000246   EM: 1   CONTEXT: pv guest (d0v0)
		(XEN) [2016-07-28 00:13:18] rax: 0000000000000000   rbx: 0000000000000000   rcx: 000000016f144000
		(XEN) [2016-07-28 00:13:18] rdx: 0000000100000000   rsi: 000000016f144000   rdi: fffffffffffff000
		(XEN) [2016-07-28 00:13:18] rbp: 0000000001000000   rsp: ffffffff81e03e50   r8:  ffffffff81efb0c0
		(XEN) [2016-07-28 00:13:18] r9:  0000000000000000   r10: 0000000000000000   r11: 0000000100000000
		(XEN) [2016-07-28 00:13:18] r12: 0000000000000000   r13: 0000000000000000   r14: ffffffff81e03f28
		(XEN) [2016-07-28 00:13:18] r15: 0000000000000000   cr0: 0000000080050033   cr4: 00000000001526e0
		(XEN) [2016-07-28 00:13:18] cr3: 0000000841e06000   cr2: 0000000000000018
		(XEN) [2016-07-28 00:13:18] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
		(XEN) [2016-07-28 00:13:18] Guest stack trace from rsp=ffffffff81e03e50:

check ar the RIP addr

	addr2line -e /usr/lib/debug/boot/vmlinux-4.7.0-5-default.debug ffffffff81f63eb0
		/usr/src/debug/kernel-default-4.7.0/linux-4.7/linux-obj/../arch/x86/platform/efi/efi.c:123

in source

	@ https://github.com/torvalds/linux/blob/v4.7/arch/x86/platform/efi/efi.c

		...
		void __init efi_find_mirror(void)
		{
			efi_memory_desc_t *md;
			u64 mirror_size = 0, total_size = 0;

			for_each_efi_memory_desc(md) {
				unsigned long long start = md->phys_addr;
123				unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;

				total_size += size;
				if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
					memblock_mark_mirror(start, size);
					mirror_size += size;
				}
			}
			if (mirror_size)
				pr_info("Memory: %lldM/%lldM mirrored memory\n",
					mirror_size>>20, total_size>>20);
		}
		...

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