Re: [Xen-devel] booting domU guest as pvh works in xen-4.11.1 but fails in 4.12

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Tue, 16 Apr 2019, Andrew Cooper wrote:

> From the log:
> 
> traps: modprobe[48] trap invalid opcode ip:7f797dc7bb95 sp:7ffe3099cdb8 erro
> r:0 in ld-2.29.so[7f797dc61000+21000]
> 
> 
> Can you disassemble ld-2.29.so and find out what that instruction is?  It is
> almost certainly a related factor.

I get lines like
[    1.384356] traps: modprobe[36] trap invalid opcode ip:7f57448af179 
sp:7fff8fc3a938 error:0 in ld-2.29.so[7f5744895000+20000]

I am guessing the right place to look in ld-2.29.so is 
0x7f57448af179-0x7f57448950000-20000 = 86873 in which case I get
(gdb) x/10i 86873
   0x15359 <_dl_close_worker+3593>:     mov    (%rsi,%rcx,8),%r8
   0x1535d <_dl_close_worker+3597>:     testb  $0x20,0x31d(%r8)
   0x15365 <_dl_close_worker+3605>:     jne    0x15375 
<_dl_close_worker+3621>
   0x15367 <_dl_close_worker+3607>:     cmp    %ecx,%edx
   0x15369 <_dl_close_worker+3609>:     je     0x15372 
<_dl_close_worker+3618>
   0x1536b <_dl_close_worker+3611>:     mov    %edx,%r9d
   0x1536e <_dl_close_worker+3614>:     mov    %r8,(%rsi,%r9,8)
   0x15372 <_dl_close_worker+3618>:     add    $0x1,%edx
   0x15375 <_dl_close_worker+3621>:     add    $0x1,%rcx
   0x15379 <_dl_close_worker+3625>:     cmp    %ecx,%eax

Some more lines like this are
[    1.571479] traps: modprobe[41] trap invalid opcode ip:7f3e3628d179 
sp:7ffc86abbe08 error:0 in ld-2.29.so[7f3e36273000+20000]
[    1.630562] traps: modprobe[43] trap invalid opcode ip:7f227b39a179 
sp:7ffdfd943198 error:0 in ld-2.29.so[7f227b380000+20000]
which all seem to get to the same place. Is this useful or am I looking in 
the wrong place?

        Michael Young

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