From: Aaron Cornelius <Aaron.Cornelius@dornerworks.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: Xen 4.7 crash
Date: Wed, 1 Jun 2016 20:45:06 +0000 [thread overview]
Message-ID: <2D1D4CC433A3D1448C10AC5545A3471DF1378C9B@Quimby.dw.local> (raw)
In-Reply-To: <f57269b4-8f74-f4fb-f222-be8697991ceb@citrix.com>
> -----Original Message-----
> From: Andrew Cooper [mailto:amc96@hermes.cam.ac.uk] On Behalf Of
> Andrew Cooper
> Sent: Wednesday, June 1, 2016 4:01 PM
> To: Aaron Cornelius <Aaron.Cornelius@dornerworks.com>; Xen-devel <xen-
> devel@lists.xenproject.org>
> Subject: Re: [Xen-devel] Xen 4.7 crash
>
> On 01/06/2016 20:54, Aaron Cornelius wrote:
> > I am doing some work with Xen 4.7 on the cubietruck (ARM32). I've
> noticed some strange behavior after I create/destroy enough domains and
> put together a script to do the add/remove for me. For this particular test I
> am creating a small mini-os (Mirage) domain with 32MB of RAM, deleting it,
> creating the new one, and so on.
> >
> > After running this for a while, I get the following error (with version
> 8478c9409a2c6726208e8dbc9f3e455b76725a33):
> >
> > (d846) Virtual -> physical offset = 3fc00000
> > (d846) Checking DTB at 023ff000...
> > (d846) [32;1mMirageOS booting...[0m
> > (d846) Initialising console ... done.
> > (d846) gnttab_stubs.c: initialised mini-os gntmap
> > (d846) allocate_ondemand(1, 1) returning 2300000
> > (d846) allocate_ondemand(1, 1) returning 2301000
> > (XEN) grant_table.c:3288:d0v1 Grant release (0) ref:(9) flags:(2)
> > dom:(0)
> > (XEN) grant_table.c:3288:d0v1 Grant release (1) ref:(11) flags:(2)
> > dom:(0)
> > (XEN) p2m.c: dom1101: VMID pool exhausted
> > (XEN) CPU0: Unexpected Trap: Data Abort <snip>
> >
> > I'm not 100% sure, from the "VMID pool exhausted" message it would
> appear that the p2m_init() function failed to allocate a VM ID, which caused
> domain creation to fail, and the NULL pointer dereference when trying to
> clean up the not-fully-created domain.
> >
> > However, since I only have 1 domain active at a time, I'm not sure why I
> should run out of VM IDs.
>
> Sounds like a VMID resource leak. Check to see whether it is freed properly
> in domain_destroy().
>
> ~Andrew
That would be my assumption. But as far as I can tell, arch_domain_destroy() calls pwm_teardown() which calls p2m_free_vmid(), and none of the functionality related to freeing a VM ID appears to have changed in years.
- Aaron
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next prev parent reply other threads:[~2016-06-01 20:48 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 19:54 Xen 4.7 crash Aaron Cornelius
2016-06-01 20:00 ` Andrew Cooper
2016-06-01 20:45 ` Aaron Cornelius [this message]
2016-06-01 21:24 ` Andrew Cooper
2016-06-01 22:18 ` Julien Grall
2016-06-01 22:26 ` Andrew Cooper
2016-06-01 21:35 ` Andrew Cooper
2016-06-01 22:24 ` Julien Grall
2016-06-01 22:31 ` Andrew Cooper
2016-06-02 8:47 ` Jan Beulich
2016-06-02 8:53 ` Andrew Cooper
2016-06-02 9:07 ` Jan Beulich
2016-06-01 22:35 ` Julien Grall
2016-06-02 1:32 ` Aaron Cornelius
2016-06-02 8:49 ` Jan Beulich
2016-06-02 9:07 ` Julien Grall
2016-06-06 13:58 ` Aaron Cornelius
2016-06-06 14:05 ` Julien Grall
2016-06-06 14:19 ` Wei Liu
2016-06-06 15:02 ` Aaron Cornelius
2016-06-07 9:53 ` Ian Jackson
2016-06-07 13:40 ` Aaron Cornelius
2016-06-07 15:13 ` Aaron Cornelius
2016-06-09 11:14 ` Ian Jackson
2016-06-14 13:11 ` Aaron Cornelius
2016-06-14 13:15 ` Wei Liu
2016-06-14 13:26 ` Aaron Cornelius
2016-06-14 13:38 ` Aaron Cornelius
2016-06-14 13:47 ` Wei Liu
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