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Re: port-xen/46105: hypervisor-dependent(?) xen crash

The following reply was made to PR port-xen/46105; it has been noted by GNATS.

From: Jeff Rizzo <>
To: Manuel Bouyer <>
Subject: Re: port-xen/46105: hypervisor-dependent(?) xen crash
Date: Mon, 27 Feb 2012 10:10:00 -0800

 OK, I fixed the patch (my fault, not yours), and got the teeny version
 info.  Once again, I got one 3.1 crash, and one without crash.  They
 both appear to be the same hypervisor version:
 From the one that didn't crash:
 hypervisor0 at mainbus0: Xen version 3.1.2-128.1.10.el5
 From the one that did:
 hypervisor0 at mainbus0: Xen version 3.1.2-128.1.10.el5
 Here's the crash log, in case it helps.
 Xen Minimal OS!
   start_info: 0xa01000(VA)
     nr_pages: 0x26700
   shared_inf: 0xbfd92000(MA)
      pt_base: 0xa04000(VA)
 nr_pt_frames: 0x9
     mfn_list: 0x967000(VA)
    mod_start: 0x0(VA)
      mod_len: 0
        flags: 0x0
     cmd_line:  root=/dev/sda1 ro 4
   stack:      0x946780-0x966780
 MM: Init
       _text: 0x0(VA)
      _etext: 0x61e65(VA)
    _erodata: 0x76000(VA)
      _edata: 0x7b6d4(VA)
 stack start: 0x946780(VA)
        _end: 0x966d34(VA)
   start_pfn: a10
     max_pfn: 26700
 Mapping memory range 0xc00000 - 0x26700000
 setting 0x0-0x76000 readonly
 skipped 0x1000
 MM: Initialise page allocator for b3e000(b3e000)-0(26700000)
 MM: done
 Demand map pfns at 26701000-36701000.
 Heap resides at 36702000-76702000.
 Initialising timer interface
 Initialising console ... done.
 gnttab_table mapped at 0x26701000.
 Initialising scheduler
 Thread "Idle": pointer: 0x36702008, stack: 0xbf0000
 Initialising xenbus
 Thread "xenstore": pointer: 0x36702478, stack: 0x26600000
 Dummy main: start_info=0x966880
 Thread "main": pointer: 0x367028e8, stack: 0x26610000
 "main" "root=/dev/sda1" "ro" "4"
 vbd 2049 is hd0
 ******************* BLKFRONT for device/vbd/2049 **********
 backend at /local/domain/0/backend/vbd/3319/2049
 Failed to read /local/domain/0/backend/vbd/3319/2049/feature-barrier.
 Failed to read /local/domain/0/backend/vbd/3319/2049/feature-flush-cache.
 2097152 sectors of 0 bytes
 vbd 2050 is hd1
 ******************* BLKFRONT for device/vbd/2050 **********
 backend at /local/domain/0/backend/vbd/3319/2050
 Failed to read /local/domain/0/backend/vbd/3319/2050/feature-barrier.
 Failed to read /local/domain/0/backend/vbd/3319/2050/feature-flush-cache.
 10485760 sectors of 0 bytes
 [H[J  Booting 'NetBSD AMI'
 root (hd0)
  Filesystem type is ext2fs, using whole disk
 kernel /boot/netbsd root=xbd1
 xc_dom_probe_bzimage_kernel: kernel is not a bzImage
 close blk: backend at /local/domain/0/backend/vbd/3319/2049
 close blk: backend at /local/domain/0/backend/vbd/3319/2050
 Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
     2006, 2007, 2008, 2009, 2010, 2011, 2012
     The NetBSD Foundation, Inc.  All rights reserved.
 Copyright (c) 1982, 1986, 1989, 1991, 1993
     The Regents of the University of California.  All rights reserved.
 NetBSD 6.0_BETA (EC2) #2: Mon Feb 27 09:34:05 PST 2012
 total memory = 615 MB
 avail memory = 596 MB
 mainbus0 (root)
 hypervisor0 at mainbus0: Xen version 3.1.2-128.1.10.el5
 vcpu0 at hypervisor0: Intel(R) Xeon(R) CPU           E5430  @ 2.66GHz,
 id 0x1067a
 xenbus0 at hypervisor0: Xen Virtual Bus Interface
 xencons0 at hypervisor0: Xen Virtual Console Driver
 npx0 at hypervisor0: using exception 16
 xennet0 at xenbus0 id 0: Xen Virtual Network Interface
 xennet0: MAC address 12:31:40:00:48:87
 xbd0 at xenbus0 id 2049: Xen Virtual Block Device Interface
 xbd1 at xenbus0 id 2050: Xen Virtual Block Device Interface
 balloon0 at xenbus0 id 0: Xen Balloon driver
 balloon0: current reservation: 629760 KiB
 xennet0: using RX copy mode
 balloon0: current reservation: 157440 pages => target: 157440 pages
 boot device: xbd1
 root on xbd1a dumps on xbd1b
 root file system type: ffs
 xpq_flush_queue: 3 entries (0 successful) on cpu0 (0)
 cpu0 (0):
   0x00000003ddc96000: 0x00000002d6379001
   0x00000003ddc96008: 0x00000002d6338001
   0x00000003ddc96010: 0x00000002d6337001
 panic: HYPERVISOR_mmu_update failed, ret: -22
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 eip c0136664 cs 9 eflags 282 cr2 36fc0000 ilevel 8
 Stopped in pid 1.1 (init) at    netbsd:breakpoint+0x4:  popl    %ebp
  at netbsd:breakpoint+0x4
 ea) at netbsd:vpanic+0x218
 at n
 t netbsd:xpq_flush_queue+0x188
 c96010,3) at netbsd:xpq_queue_tlb_flush+0x19
 tlbflush(ddc96010,3,d6337001,2,0,bfdfc000,0,3,0,0) at netbsd:tlbflush+0x1a
 ,ffffffff) at netbsd:cpu_load_pmap+0xfd
 fffff) at netbsd:pmap_load+0x1b0
 t netbsd:do_pmap_load+0x16
 copyout(c14f7800,7c8000,c0632200,0,c010006d,0,0,0,0,0) at
 ds          d8d20011
 es          c04c0011    copyright+0x35b91
 fs          31
 gs          d8d20011
 edi         d8d22a78
 esi         c04c5e74    copyright+0x3b9f4
 ebp         d8d22a0c
 ebx         104
 edx         ffffffff
 ecx         0
 eax         1
 eip         c0136664    breakpoint+0x4
 cs          9
 eflags      282
 esp         d8d22a0c
 ss          11
 netbsd:breakpoint+0x4:  popl    %ebp

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