On Tue, 2015-12-01 at 14:47 -0800, Cong Wang wrote:
> On Tue, Dec 1, 2015 at 2:33 PM, Eric Dumazet wrote:
> > Hmm... it looks like we have a much more serious bug :
> >
> > qdisc_lookup() calls qdisc_match_from_root(dev->qdisc, handle) without
> > proper lock being held, so we might actually crash
On Tue, Dec 1, 2015 at 2:33 PM, Eric Dumazet wrote:
> Hmm... it looks like we have a much more serious bug :
>
> qdisc_lookup() calls qdisc_match_from_root(dev->qdisc, handle) without
> proper lock being held, so we might actually crash the host,
> if qdisc_tree_decrease_qlen() happens at the time
On Tue, Dec 1, 2015 at 12:06 PM, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 11:17 -0800, Cong Wang wrote:
>> On Tue, Dec 1, 2015 at 11:09 AM, Eric Dumazet wrote:
>> > On Tue, 2015-12-01 at 10:43 -0800, Cong Wang wrote:
>> >
>> >> This smells hacky... Another way to fix this is to hold the qdisc
On Tue, 2015-12-01 at 12:06 -0800, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 11:17 -0800, Cong Wang wrote:
> > On Tue, Dec 1, 2015 at 11:09 AM, Eric Dumazet
> > wrote:
> > > On Tue, 2015-12-01 at 10:43 -0800, Cong Wang wrote:
> > >
> > >> This smells hacky... Another way to fix this is to hold
On Tue, 2015-12-01 at 11:17 -0800, Cong Wang wrote:
> On Tue, Dec 1, 2015 at 11:09 AM, Eric Dumazet wrote:
> > On Tue, 2015-12-01 at 10:43 -0800, Cong Wang wrote:
> >
> >> This smells hacky... Another way to fix this is to hold the qdisc tree
> >> lock in mq_dump(), since it is not a hot path (com
On Tue, Dec 1, 2015 at 11:09 AM, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 10:43 -0800, Cong Wang wrote:
>
>> This smells hacky... Another way to fix this is to hold the qdisc tree
>> lock in mq_dump(), since it is not a hot path (comparing with
>> enqueue/dequeue)?
>
> Really ? Which qdisc tree
I can't be 100% sure but after running transmission for over an hour
without any problems I'd say this fix worked. I'll keep it running for a
while so if it suddently freezes again I'll report it, but I hope it
won't be the case.
Daniele
On Tue, Dec 01, 2015 at 06:15:37AM -0800, Eric Dumazet wrot
On Tue, 2015-12-01 at 10:43 -0800, Cong Wang wrote:
> This smells hacky... Another way to fix this is to hold the qdisc tree
> lock in mq_dump(), since it is not a hot path (comparing with
> enqueue/dequeue)?
Really ? Which qdisc tree lock will protect you exactly ???
Whole point of MQ is that e
On Tue, Dec 1, 2015 at 8:34 AM, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 17:13 +0100, PaX Team wrote:
>> On 1 Dec 2015 at 6:10, Eric Dumazet wrote:
>>
>> > On Tue, 2015-12-01 at 06:06 -0800, Eric Dumazet wrote:
>> > > On Tue, 2015-12-01 at 12:19 +0100, Daniele Fucini wrote:
>> > > > Thanks for
On Tue, 2015-12-01 at 17:13 +0100, PaX Team wrote:
> On 1 Dec 2015 at 6:10, Eric Dumazet wrote:
>
> > On Tue, 2015-12-01 at 06:06 -0800, Eric Dumazet wrote:
> > > On Tue, 2015-12-01 at 12:19 +0100, Daniele Fucini wrote:
> > > > Thanks for the reply. Here's the output of `tc qdisc show`:
> > > > ht
On 1 Dec 2015 at 6:10, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 06:06 -0800, Eric Dumazet wrote:
> > On Tue, 2015-12-01 at 12:19 +0100, Daniele Fucini wrote:
> > > Thanks for the reply. Here's the output of `tc qdisc show`:
> > > https://gist.github.com/1847102c8fe08f63e9e7
>
> > Hmm... I do n
> > On Mon, Nov 30, 2015 at 08:50:29PM -0800, Cong Wang wrote:
> > > On Mon, Nov 30, 2015 at 5:00 PM, Daniele Fucini wrote:
> > > > Hello,
> > > >
> > > > I'm using a Grsecurity patched kernel (version 4.2.6-201511282239) and
> > > &
On Tue, 2015-12-01 at 06:06 -0800, Eric Dumazet wrote:
> On Tue, 2015-12-01 at 12:19 +0100, Daniele Fucini wrote:
> > Thanks for the reply. Here's the output of `tc qdisc show`:
> > https://gist.github.com/1847102c8fe08f63e9e7
> Hmm... I do not think we ever took care of MQ in
> qdisc_tree_decreas
2015 at 5:00 PM, Daniele Fucini wrote:
> > > Hello,
> > >
> > > I'm using a Grsecurity patched kernel (version 4.2.6-201511282239) and
> > > I'm getting system freezes due to PaX detecting a size overflow in
> > > function qdisc_tree_de
ecurity patched kernel (version 4.2.6-201511282239) and
> > I'm getting system freezes due to PaX detecting a size overflow in
> > function qdisc_tree_decrease_qlen net/sched/sch_api.c:769 whenever I use
> > Transmission BitTorrent client.
> >
> > On t
On Mon, Nov 30, 2015 at 5:00 PM, Daniele Fucini wrote:
> Hello,
>
> I'm using a Grsecurity patched kernel (version 4.2.6-201511282239) and
> I'm getting system freezes due to PaX detecting a size overflow in
> function qdisc_tree_decrease_qlen net/sched/sch_api.c:769 when
Hello,
I'm using a Grsecurity patched kernel (version 4.2.6-201511282239) and
I'm getting system freezes due to PaX detecting a size overflow in
function qdisc_tree_decrease_qlen net/sched/sch_api.c:769 whenever I use
Transmission BitTorrent client.
On the Grsecurity forum I was
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