From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: pvgrub "Error 9: Unknown boot failure" booting
 Debian Jessie kernel (Was: Re: [PATCH v5 6/9] libxc: create unmapped initrd
 in domain builder if supported)
Date: Mon, 30 Nov 2015 16:56:20 +0000
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On Mon, 2015-11-30 at 16:25 +0000, Ian Campbell wrote:
> (d54) Pinning the boot page table pfn 4be3 / mfn 1bfd71/1bfd71
> (d54) pin_table: MFN 1bfd71
> (XEN) mm.c:2417:d54v0 Bad type (saw 1400000000000001 != exp 7000000000000000) for mfn 165b81 (pfn 4d81)

I added a "BUG_ON(*pt_pfn == 0x4d81);" to mini-os's new_pt_frame, which
after some messing with gdb to decode produced this stack trace:

716e7: arch_do_exit + 9 in section .text
66176: do_exit + 28 in section .text
6ff68: new_pt_frame + 134 in section .text
70401: need_pgt + 410 in section .text
706ec: do_map_frames + 284 in section .text
66e72: sbrk + 130 in section .text
7768e: _sbrk_r + 30 in section .text
74fa3: _malloc_r + 1219 in section .text
76f3f: _realloc_r + 511 in section .text
31035: unsafe_flush + 46 in section .text
38bc7: unxz + 480 in section .text
310fa: xc_dom_decompress_unsafe + 110 in section .text
38cec: xc_try_xz_decode + 45 in section .text
286ff: xc_dom_probe_bzimage_kernel + 891 in section .text
24613: xc_dom_find_loader + 89 in section .text
24d83: xc_dom_parse_image + 58 in section .text
19d06: kexec + 1012 in section .text
03c27: pv_boot + 97 in section .text
08e4b: boot_func + 52 in section .text
0ab16: run_script + 294 in section .text
10848: run_menu + 3133 in section .text
10fb2: cmain + 1444 in section .text
04447: main + 303 in section .text
66991: call_main + 581 in section .text
03423: thread_starter + 9 in section .text

I'm not quite sure what to make of this, in particular I don't see anything
in kexec.c which obviously looks after unmapping the heap or brk areas.

Ian.