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

[lists@xxxxxxxxxxxx]

On Wed, Jul 27, 2016, at 11:36 AM, lists@xxxxxxxxxxxx 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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