Re: [Xen-devel] [PATCH] xend: disallow multiple destroy() call

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2013-02-17 at 05:07 +0000, Joe Jin wrote:
> Execute "xl-destroy" twice lead the dom0 panic:
> config file as below:

Thanks.

> kernel BUG at drivers/pci/access.c:423!
[...]
> BTW: xm-create work fine but xl-create trigger the panic as below:

Both the panic above and the warn+panic below seem like kernel bugs
which are simply exposed by xl rather than xl bugs as such. Presumably
xl just tickles things different to xm.

The dom0 kernel you are using is a bit dated and appears (from the
revision) to be rather heavily patched.

> > WARNING: at fs/proc/generic.c:850 remove_proc_entry+0x22d/0x240()
> > Hardware name: SUN FIRE X4370 M2 SERVER
> > remove_proc_entry: removing non-empty directory 'irq/536', leaking at least 
> > 'eth7'
[..]
> > BUG: unable to handle kernel NULL pointer dereference at 000000000000001c
> > IP: [<ffffffff812f6a76>] evtchn_from_irq+0x16/0x40

Wei recently posted a bug fix for an issue which looked a bit like this
last one. That was something do with error handling on allocation
failure though so I doubt it represents the actual root cause though.

Ian.


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