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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 27/07/16 17:21, lists@xxxxxxxxxxxx wrote:
> [    0.000000] DMI: Supermicro X10SAT/X10SAT, BIOS 3.0 05/26/2015
> [    0.000000] Hypervisor detected: Xen
> [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
> [    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
> [    0.000000] e820: last_pfn = 0x16f144 max_arch_pfn = 0x400000000
> [    0.000000] MTRR: Disabled
> [    0.000000] x86/PAT: MTRRs disabled, skipping PAT initialization too.
> [    0.000000] x86/PAT: Configuration [0-7]: WB  WT  UC- UC  WC  WP  UC  UC  
> [    0.000000] e820: last_pfn = 0x9e891 max_arch_pfn = 0x400000000
> (XEN) [2016-07-27 16:08:38] d0v0: unhandled page fault (ec=0000)
> (XEN) [2016-07-27 16:08:38] Pagetable walk from 0000000000000018:
> (XEN) [2016-07-27 16:08:38]  L4[0x000] = 0000000000000000 ffffffffffffffff
> (XEN) [2016-07-27 16:08:38] domain_crash_sync called from entry.S: fault at 
> ffff82d08022ca4a entry.o#create_bounce_frame+0x137/0x146
> (XEN) [2016-07-27 16:08:38] Domain 0 (vcpu#0) crashed on cpu#0:
> (XEN) [2016-07-27 16:08:38] ----[ Xen-4.7.0_08-452  x86_64  debug=n  Tainted: 
>    C ]----
> (XEN) [2016-07-27 16:08:38] CPU:    0
> (XEN) [2016-07-27 16:08:38] RIP:    e033:[<ffffffff81f6374c>]
> (XEN) [2016-07-27 16:08:38] RFLAGS: 0000000000000246   EM: 1   CONTEXT: pv 
> guest (d0v0)
> (XEN) [2016-07-27 16:08:38] rax: 0000000000000000   rbx: 0000000000000000   
> rcx: 0000000100000000
> (XEN) [2016-07-27 16:08:38] rdx: 000000016f144000   rsi: ffffffff81efb2c0   
> rdi: 000000016f144000
> (XEN) [2016-07-27 16:08:38] rbp: 0000000000000000   rsp: ffffffff81e03e50   
> r8:  0000000000000200
> (XEN) [2016-07-27 16:08:38] r9:  0000000000000000   r10: 0000000000007ff0   
> r11: 0000000000000067
> (XEN) [2016-07-27 16:08:38] r12: 0000000000000000   r13: ffffffff81e03f28   
> r14: 0000000000000000
> (XEN) [2016-07-27 16:08:38] r15: 0000000000000000   cr0: 0000000080050033   
> cr4: 00000000001526e0
> (XEN) [2016-07-27 16:08:38] cr3: 0000000841e06000   cr2: 0000000000000018
> (XEN) [2016-07-27 16:08:38] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 
> e02b   cs: e033
> (XEN) [2016-07-27 16:08:38] Guest stack trace from rsp=ffffffff81e03e50:
> (XEN) [2016-07-27 16:08:38]    0000000100000000 0000000000000067 
> 0000000000000000 ffffffff81f6374c
> (XEN) [2016-07-27 16:08:38]    000000010000e030 0000000000010046 
> ffffffff81e03e98 000000000000e02b
> (XEN) [2016-07-27 16:08:38]    ffffffff820e2ce0 0000000001000000 
> 0000000001290000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    ffffffff81e03f28 ffffffff81f4d940 
> ffffffff8118b419 ffffffff00000010
> (XEN) [2016-07-27 16:08:38]    ffffffff81e03f28 ffffffff81e03ee0 
> 000000000000001a 0000000000000000
> (XEN) [2016-07-27 16:08:38]    ffffffffffffffff 0000000000000000 
> ffffffff81fe9920 0000000000000000
> (XEN) [2016-07-27 16:08:38]    0000000000000000 0000000000000000 
> ffffffff81f42b92 ffffffff81ff62e0
> (XEN) [2016-07-27 16:08:38]    ffffffff81e03f68 ffffffff81e03f64 
> 0000000000000000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    ffffffff81f486b1 000306c300000000 
> 0000000100100800 0300000100000032
> (XEN) [2016-07-27 16:08:38]    0000000000000005 0000000000000000 
> 0000000000000000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    0000000000000000 0000000000000000 
> 0000000000000000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    0000000000000000 0000000000000000 
> 0000000000000000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    0000000000000000 0000000000000000 
> 0000000000000000 0000000000000000
> (XEN) [2016-07-27 16:08:38]    0000000000000000 0000000000000000 
> 0f00000060c0c748 ccccccccccccc305
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38]    cccccccccccccccc cccccccccccccccc 
> cccccccccccccccc cccccccccccccccc
> (XEN) [2016-07-27 16:08:38] Hardware Dom0 crashed: 'noreboot' set - not 
> rebooting.

This looks suspiciously like the issue which was fixed by c/s
d6b186c1e2d852a92c43f090d0d8fad4704d51ef "x86/xen: avoid m2p lookup when
setting early page table entries", but that fix is present in Linux 4.7.0

Can you check to see whether the commit is included in your kernel?

Failing that, can you find out exactly where the kernel crashed?  You
need to manually decode ffffffff81f6374c with the debug symbols.

~Andrew

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