Re: [Xen-devel] [PATCH v2] xen: Add acpu_sleep=s3_fake command-line option for testing

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.05.18 at 17:25, <george.dunlap@xxxxxxxxxx> wrote:
> With your code dump patch (sorry for the wrapping):
> 
> (XEN) *** DOUBLE FAULT ***
> (XEN) ----[ Xen-4.11-rc  x86_64  debug=y   Not tainted ]----
> (XEN) CPU:    0
> (XEN) RIP:    e008:[<ffff82d080378964>] handle_exception+0x9c/0xff
> (XEN) RFLAGS: 0000000000010006   CONTEXT: hypervisor
> (XEN) rax: ffffc900402040d8   rbx: 0000000000000000   rcx: 0000000000000003
> (XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000000000
> (XEN) rbp: 000036ffbfdfbf07   rsp: ffffc90040204000   r8:  0000000000000000
> (XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
> (XEN) r12: 0000000000000000   r13: 0000000000000000   r14: ffffc90040207fff
> (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 0000000000002660
> (XEN) cr3: 000000019200a000   cr2: ffffc90040203ff8
> (XEN) fsb: 00007f800083d700   gsb: ffff88003dc40000   gss: 0000000000000000
> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
> (XEN) Xen code around <ffff82d080378964> (handle_exception+0x9c/0xff):
> (XEN)  00 f3 90 0f ae e8 eb f9 <e8> 07 00 00 00 f3 90 0f ae e8 eb f9 83

So that's a CALL (in the RSB stashing loop), meaning presumably the
page right below RSP is not present (ballooned out?) or r/o. I'm afraid
we may have accumulated a rather deep stack already, making it
rather cumbersome to unwind all of that and find where badness
started.

Jan



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