Stefan Farfeleder wrote:
> Imagine this scenario where CPU 0 inserts a knote kn1 (the marker) in
> knote_scan and CPU 1 kn2 in kqueue_enqueue:
>
> CPU 0 | CPU 1
> +---
> kn1->kn_tqe.tqe_next = NULL;
On Wed, Oct 09, 2002 at 04:07:45PM -0700, Terry Lambert wrote:
> Stefan Farfeleder wrote:
> > Is it just a warning or does it pose a real problem?
> >
> > I think the problem with the current code is that knote_{en,de}queue can
> > be executed in parallel (on another CPU, spl*() can't prevent tha
On 10 Oct, Stefan Farfeleder wrote:
> On Tue, Oct 08, 2002 at 09:26:29PM -0700, Don Lewis wrote:
>> On 8 Oct, Stefan Farfeleder wrote:
>> > However, WITNESS complains (only once) about this:
>> > lock order reversal
>> > 1st 0xc662140c kqueue mutex (kqueue mutex) @
>/freebsd/current/src/sys/ke
Stefan Farfeleder wrote:
> Is it just a warning or does it pose a real problem?
>
> I think the problem with the current code is that knote_{en,de}queue can
> be executed in parallel (on another CPU, spl*() can't prevent that, can
> it?) with kqueue_scan and that kq->kq_head thus can be corrupted
On Tue, Oct 08, 2002 at 09:26:29PM -0700, Don Lewis wrote:
> On 8 Oct, Stefan Farfeleder wrote:
> > On Mon, Oct 07, 2002 at 03:48:45AM -0700, Terry Lambert wrote:
>
> > Following the advice from the spl* man page I turned the spl* calls to a
> > mutex and was surprised to see it working. My SMP
On 8 Oct, Stefan Farfeleder wrote:
> On Mon, Oct 07, 2002 at 03:48:45AM -0700, Terry Lambert wrote:
> Following the advice from the spl* man page I turned the spl* calls to a
> mutex and was surprised to see it working. My SMP -current survived a 'make
> -j16 buildworld' with make using kqueue()
On Mon, Oct 07, 2002 at 03:48:45AM -0700, Terry Lambert wrote:
>
> *** OK, it's very hard to believe you didn't break into the
> *** debugger and manually call "pnaic" to get this to happen.
You're right, this is exactly what I did.
> I can't personally repeat the problem, so you're elected to
On Mon, 7 Oct 2002, Terry Lambert wrote:
> Stefan Farfeleder wrote:
> >
> > I'm confused why marker - if it was removed by TAILQ_REMOVE - hasn't
> > kn_tqe.tqe_next and kn_tqe.tqe_prev set to (void *)-1.
because that only happens if the debug code in queue.h is enabled, which
it is not..
>
Stefan Farfeleder wrote:
> On Sun, Oct 06, 2002 at 11:14:26PM -0700, Terry Lambert wrote:
> > Stefan: Did the patch fix it, or not?
>
> Sorry for the long delay. No, it did not. But I now have a rather
> interesting core dump. I inserted a KASSERT, so that the code looks like
> this:
>
> TAI
On Sun, Oct 06, 2002 at 11:14:26PM -0700, Terry Lambert wrote:
>
> Stefan: Did the patch fix it, or not?
Sorry for the long delay. No, it did not. But I now have a rather
interesting core dump. I inserted a KASSERT, so that the code looks like
this:
TAILQ_INSERT_TAIL(&kq->kq_head, &marker,
Terry Lambert wrote:
> Stefan Farfeleder wrote:
> > (kgdb) l *kqueue_scan+0x242
> > 0xc01a1212 is in kqueue_scan
> > (/freebsd/current/src/sys/kern/kern_event.c:716).
> > 713 TAILQ_INSERT_TAIL(&kq->kq_head, &marker, kn_tqe);
> > 714 while (count) {
> > 715
Stefan Farfeleder wrote:
> (kgdb) l *kqueue_scan+0x242
> 0xc01a1212 is in kqueue_scan
> (/freebsd/current/src/sys/kern/kern_event.c:716).
> 713 TAILQ_INSERT_TAIL(&kq->kq_head, &marker, kn_tqe);
> 714 while (count) {
> 715 kn = TAILQ_FIRST(&kq->kq_head);
On Fri, Oct 04, 2002 at 04:33:17PM -0400, John Baldwin wrote:
I wrote:
> >> Fatal trap 12: page fault while in kernel mode
> >> cpuid = 0; lapic.id =
> >> fault virtual address = 0x8
> >> fault code = supervisor read, page not present
> >> instruction pointer = 0x8:0xc
* De: Poul-Henning Kamp <[EMAIL PROTECTED]> [ Data: 2002-10-04 ]
[ Subjecte: Re: Junior Kernel Hacker page updated... ]
> In message <[EMAIL PROTECTED]>, Stefan Farfeleder writes:
> >
>
> I have committed your patch, but left it #undef'ed until we g
In message <[EMAIL PROTECTED]>, Stefan Farfeleder writes:
>
I have committed your patch, but left it #undef'ed until we get
the kernel straightened out.
On behalf of the FreeBSD project I have to warn you that if you
persist in doing work of this kind over and over again, you will
eventually be
On 04-Oct-2002 Juli Mallett wrote:
> * De: Stefan Farfeleder <[EMAIL PROTECTED]> [ Data: 2002-10-04 ]
> [ Subjecte: Re: Junior Kernel Hacker page updated... ]
>> On Thu, Oct 03, 2002 at 04:41:46PM +0200, Poul-Henning Kamp wrote:
>> >
>> > Hi Stefan,
* De: Stefan Farfeleder <[EMAIL PROTECTED]> [ Data: 2002-10-04 ]
[ Subjecte: Re: Junior Kernel Hacker page updated... ]
> On Thu, Oct 03, 2002 at 04:41:46PM +0200, Poul-Henning Kamp wrote:
> >
> > Hi Stefan,
> >
> > I tried this patch and it paniced
On Thu, Oct 03, 2002 at 04:41:46PM +0200, Poul-Henning Kamp wrote:
>
> Hi Stefan,
>
> I tried this patch and it paniced my (almost-) current machine with
> a pagefault in the kqueue code: Bravo!
>
> I can see that there is some amount of #ifdef stuff in your patch,
The #ifdefs are already in
Hi Stefan,
I tried this patch and it paniced my (almost-) current machine with
a pagefault in the kqueue code: Bravo!
I can see that there is some amount of #ifdef stuff in your patch,
in light of that, would it be possible to make an #ifdef'ed version
of your patch which we could commit ?
Th
On Wed, 2002-10-02 at 14:40, Stefan Farfeleder wrote:
> On Sat, Sep 14, 2002 at 12:17:53PM +0200, Poul-Henning Kamp wrote:
> >
> > This is just to note that I have updated the JKH page with a lot of
new
> > stuff, so if your coding-pencil itches:
> >
> > http://people.freebsd.org/~phk/TODO/
>
> |M
On 2 Oct, Don Lewis wrote:
> On 2 Oct, Stefan Farfeleder wrote:
>
>> /freebsd/current/src/sys/vm/uma_core.c:1307: could sleep with "filedesc structure"
>locked from /freebsd/current/src/sys/kern/kern_event.c:959
>>
>> at me and freezes badly at some point (no breaking into ddb possible).
>> T
On 2 Oct, Stefan Farfeleder wrote:
> /freebsd/current/src/sys/vm/uma_core.c:1307: could sleep with "filedesc structure"
>locked from /freebsd/current/src/sys/kern/kern_event.c:959
>
> at me and freezes badly at some point (no breaking into ddb possible).
> This is totally repeatable. Is anybo
On Sat, Sep 14, 2002 at 12:17:53PM +0200, Poul-Henning Kamp wrote:
>
> This is just to note that I have updated the JKH page with a lot of new
> stuff, so if your coding-pencil itches:
>
> http://people.freebsd.org/~phk/TODO/
|Make -j improvement
|
|make(1) with -j option uses a select lo
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