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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: Manuel Bouyer <>
Subject: Re: port-xen/46105: hypervisor-dependent(?) xen crash
Date: Mon, 27 Feb 2012 12:35:56 +0100

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 On Mon, Feb 27, 2012 at 01:25:01AM +0000, wrote:
 >      While creating NetBSD 6.0_BETA/i386 AMIs for Amazon EC2, 2 out of
 >      7 did not come up properly.  When I investigated more closely,
 >      both the ones which did not come up had a hypervisor version of
 >      3.1, while all the others were 3.4.
 >      Other details: the instances only had 1 vcpu, so MP should not
 >      be a factor.  The regions where the failures occurred (and
 >      are more likely, I guess, to have 3.1 hypervisors) were "us-west-1"
 >      and "ap-northeast-1".
 >      Here is the console log for one of the crashed instances:
 > [...]
 Hum, 6.0_BETA 201202250740Z boots fine for me on a NetBSD/amd64 domains0
 and 3.1.4 hypervisor. I tested both i386PAE and amd64 domUs.
 I fear it's one of the bugs we fixed with recursive table pages;
 if so it's going to be hard to work around.
 Do you know if it happens with all Amazon 3.1 hypervisors, or only
 some ?
 I guess there's no way to restricy a domain to some hypervisor versions
 on amazon ?
 Also, please apply the attached diff if you can reproduce this.
 It prints the tiny version of the hypervisor, which can help identifing bugs
 Manuel Bouyer <>
      NetBSD: 26 ans d'experience feront toujours la difference
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 Index: hypervisor.c
 RCS file: /cvsroot/src/sys/arch/xen/xen/hypervisor.c,v
 retrieving revision 1.61
 diff -u -p -u -r1.61 hypervisor.c
 --- hypervisor.c       17 Feb 2012 18:42:19 -0000      1.61
 +++ hypervisor.c       27 Feb 2012 11:34:09 -0000
 @@ -210,12 +210,15 @@ hypervisor_attach(device_t parent, devic
  #endif /* NPCI */
        union hypervisor_attach_cookie hac;
 +      char xen_extra_version[XEN_EXTRAVERSION_LEN];
        xen_version = HYPERVISOR_xen_version(XENVER_version, NULL);
 -      aprint_normal(": Xen version %d.%d\n", XEN_MAJOR(xen_version),
 -             XEN_MINOR(xen_version));
 +      memset(xen_extra_version, 0, sizeof(xen_extra_version));
 +      HYPERVISOR_xen_version(XENVER_extraversion, xen_extra_version);
 +      aprint_normal(": Xen version %d.%d%s\n", XEN_MAJOR(xen_version),
 +             XEN_MINOR(xen_version), xen_extra_version);

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