Re: [Bugme-new] [Bug 38462] New: USB<->serial (pl2303) 100% CPU usage loop in 2.6.39.2 (w/ bisection)

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Hi Libor et al.

Have you made any progress on this problem? 

Best,

~ Andy

On Wed, Jun 29, 2011 at 01:40:03PM -0700, Andrew Morton wrote:
> 
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> On Tue, 28 Jun 2011 15:37:08 GMT
> bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
> 
> > https://bugzilla.kernel.org/show_bug.cgi?id=38462
> > 
> >            Summary: USB<->serial (pl2303) 100% CPU usage loop in 2.6.39.2
> >                     (w/ bisection)
> >            Product: Drivers
> >            Version: 2.5
> >     Kernel Version: 2.6.39.2
> >           Platform: All
> >         OS/Version: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: high
> >           Priority: P1
> >          Component: USB
> >         AssignedTo: greg@xxxxxxxxx
> >         ReportedBy: akwatts@xxxxxxxxx
> >         Regression: Yes
> > 
> > 
> > Commit d14fc1a74e846d7851f24fc9519fe87dc12a1231 (introduced in 2.6.37.1) causes
> > userspace dialers (ppp+wvdial) to sometimes enter a 100% CPU utilization loop
> > on disconnect -> connect cycles with a pl2303-driven Trendnet (tu-s9)
> > USB-serial adapter and US Robotics external 56K modem.
> > 
> >   commit d14fc1a74e846d7851f24fc9519fe87dc12a1231
> >   Author: Libor Pechacek <lpechacek@xxxxxxx>
> >   Date:   Fri Jan 14 14:30:21 2011 +0100
> >   USB: serial: handle Data Carrier Detect changes
> > 
> > I have not been able to systematically reproduce except by
> > connect->disconnect->(turn modem off and back on)->connect.
> > 
> > The original bug report (bug #30072), which contains a lot more background
> > including an strace of the runaway process, seems to have fallen off the radar
> > screen because it stayed as INSUFFICIENT_DATA for too long (this was my fault).
> > 
> > This report reflects that the problem remains in the 2.6.39.x tree (tested
> > through 2.6.39.2)
> > 
> 
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