RE: BUG: sleeping function called from invalid context at mm/slub.c:1595 --- "hcitool cc" or "l2ping"

Marcel Holtmann
2009-05-05T19:14:29Z

Hi Bing,

> > > > > > > > > > I'm getting this error whenever I use "hcitool cc" or "l2ping
> > > > > > > xx:xx:xx:xx:xx:xx"
> > > > > > > > > command.
> > > > > > > > > >
> > > > > > > > > > Kernel: version 2.6.30-rc3 from bluetooth-testing tree
> > > > > > > > > > HCI Tool: version 3.20
> > > > > > > > > > Laptop: Lenovo X61s
> > > > > > > > >
> > > > > > > > > can you rebase the bluetooth-testing.git tree from a few hours ago and
> > > > > > > > > test again.
> > > > > > > >
> > > > > > > > "git log" shows the last commit was ad4751fcada51292bb2967748667b582281647d0.
> > > > > > > > Bluetooth: Fix errors and warnings in L2CAP reported by checkpatch.pl
> > > > > > > >
> > > > > > > > Is it the latest one?
> > > > > > >
> > > > > > > yes, that one is the latest. What happens if you revert:
> > > > > > >
> > > > > > > commit d97ebf3798fb5745953230e049011f5b20b7c6d9
> > > > > > > Author: Roger Quadros <ext-roger.quadros@nokia.com>
> > > > > > > Date: Thu Apr 23 14:50:54 2009 +0300
> > > > > > >
> > > > > > > Bluetooth: Ensure that HCI sysfs add/del is preempt safe
> > > > > > >
> > > > > > > Does this one introduces your problem?
> > > > > > >
> > > > > > > What is your kernel config and hardware you are running this one? Seems
> > > > > > > not everybody is seeing this one.
> > > > > > >
> > > > > > Reverting d97ebf3798fb5745953230e049011f5b20b7c6d9 doesn't help.
> > > > > >
> > > > > > Today I got a chance to test it with some old tags.
> > > > > >
> > > > > > Tags:
> > > > > > v2.6.29: no issue
> > > > > > v2.6.30-rc1: no issue
> > > > > > v2.6.30-rc2: BUG: sleeping function called from invalid context at mm/slub.c:1595
> > > > > > v2.6.30-rc3: BUG: sleeping function called from invalid context at mm/slub.c:1595
> > > > > >
> > > > > > It happens on my laptops, Lenovo X61s and Fujitsu Lifebook A6110, with both v2.6.30-rc2 and
> > > > > v2.6.30-rc3.
> > > > > >
> > > > > >
> > > > > > The followings are from my Lifebook A6110,
> > > > > > with blutooth-test git tag: v2.6.30-rc2 (commit 0882e8dd).
> > > > >
> > > > > so I really think this is a kernel issue and not a Bluetooth issue. Can
> > > > > clone Linus' tree from today. All the important Bluetooth fixes for
> > > > > 2.6.30 went in today.
> > > > >
> > > > > I did double check the flush_workqueue() and as far as I can tell we can
> > > > > sleep in that context. So for some reason we are in the wrong context. I
> > > > > really don't know why.
> > > >
> > > > OK. I'll clone Linus's tree and give it a try when I get a chance.
> > >
> > > I re-based bluetooth-testing.git against 2.6.30-rc4 and that is as
> > > recent as it gets right now.
> > >
> > > Regards
> > >
> > > Marcel
> > >
> >
> > Hi Marcel,
> >
> > Just tested the latest 2.6.30-rc4 code from bluetooth-testing.git
> > and Linus's linux-2.6.git
> >
> > This error still occurs in both git trees when I do an "hcitool cc" or l2ping:
> >
> > BUG: sleeping function called from invalid context at mm/slub.c:1595
>
> The patch you sent to Davide yesterday, actually fixed my problem as well.

good to know that this fixes your issue, too. Will queue this up from
upstream inclusion.

Regards

Marcel