Date: Thu, 3 Feb 2011 10:59:32 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Monthadar Al Jaberi <monthadar@gmail.com> Cc: FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org> Subject: Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE) Message-ID: <20110203105747.K80258@maildrop.int.zabbadoz.net> In-Reply-To: <AANLkTinY0AVSsEE5PZaJOqyuinsAN6wkUL9URAqYs0X4@mail.gmail.com> References: <AANLkTik8D_bLwcUKZdBT-kpkJdDXtPTLvAqfUe0cLoSz@mail.gmail.com> <4D484213.6050100@freebsd.org> <AANLkTikJKZLQVA5X2PQs0oT4iFsZYBw7K07kjQTc9iGD@mail.gmail.com> <4D486108.5060805@freebsd.org> <AANLkTi=mk2vfyXJBaK5mV2sBWEj0-RDZneLs%2BXq_c7sb@mail.gmail.com> <20110202164827.I80258@maildrop.int.zabbadoz.net> <4D4994CE.2090209@freebsd.org> <AANLkTimDZRefv57_nanxGUbHjP1wqeQ41iWHvpXogmvU@mail.gmail.com> <4D49AB29.7070909@freebsd.org> <AANLkTinONnLE9D=c57nQmGBFbWJgqJmeKiRViW3gga2a@mail.gmail.com> <20110203095019.N80258@maildrop.int.zabbadoz.net> <AANLkTinY0AVSsEE5PZaJOqyuinsAN6wkUL9URAqYs0X4@mail.gmail.com>
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On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:
>>>> I don't understand why you saw a CRED_TO_VNET of 0
>>>> I was under the impression that every process/thread in the system wou=
ld
>>>> be
>>>> on vnet0
>>>> in a vimage kernel.
>>>
>>> This is how my printf looks like:
>>> struct thread *td =3D curthread;
>>> struct vnet *v =3D TD_TO_VNET(td);
>>> struct ucred *cred =3D CRED_TO_VNET(td->ucred);
>>> struct vnet *td_vnet =3D td->td_vnet;
>>
>> here's your problem:
>>
>> strcut vnet *vnet =3D cred->cr_prison->pr_vnet;
>
> When I add CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); I get a panic =
too...
> But your suggestion works if I do like this:
> curthread->td_vnet =3D curthread->td_ucred->cr_prison->pr_vnet;
>
> CRED_TO_VNET(curthread->td_ucred) returns NULL
I wonder how you are building your module and if VIMAGE is properly
defined. If it's not that would explain a lot of things.
>>> printf("td=3D%p, td->td_vnet=3D%p, td->td_ucred=3D%p, TD_TO_VNET=3D%p,
>>> CRED_TO_VNET=3D%p\n", td, td_vnet, td->td_ucred, v, cred);
>>>
>>> I made a fast search in /usr/src for "td_vnet" and found it was
>>> assigned only in
>>> int fork1(td, flags, pages, procp):
>>> #ifdef VIMAGE
>>> =A0 =A0 =A0 =A0td2->td_vnet =3D NULL;
>>> =A0 =A0 =A0 =A0td2->td_vnet_lpush =3D NULL;
>>> #endif
>>
>> Nice try. =A0Want another search? =A0Hint: there is this in vnet.h:
>>
>> #define curvnet curthread->td_vnet
>>
>> And then you'll, again, find the CURVNET_SET_* macros.
>
> Thank you
Something you may find useful as well btw is:
http://people.freebsd.org/~bz/20100530-02.vnet.9.html
--=20
Bjoern A. Zeeb You have to have visions!
<ks> Going to jail sucks -- <bz> All my daemons like it!
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html
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