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

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

lists@xxxxxxxxxxxx writes:

> 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;
>

While I see that you're running linux-4.7 could you please double-check
that it has the following:

commit 55f1ea15216a5a14c96738bd5284100a00ffa9dc
Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date:   Tue May 31 11:23:43 2016 +0100

    efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps

?

-- 
  Vitaly

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