Re: Hang with isync

["Manoj Sharma" <manoj.shar@gmail.com>]

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The hang has trigerred watchdog timer exception. It points that there is
problem somewhere but don't know what is it.
Even with 2.4, it does not happen regularly. It occurs once in a while and
not reproducable.

On 9/20/06, Liu Dave-r63238 <DaveLiu@freescale.com> wrote:
>
>  First, you must make sure if it really happen at watchdog timer
> exception.
> if it is, you need select one suitable way to fix it.
> Second, I don't believe the sync-isync instructions make it happen.
> you can try the 2.6, I don't know if 2.6 kernel can resolve your problem.
>
> -Dave
>
>  ------------------------------
>   Dave, watchdog timeout is around one second and no cpu activity for that
> long is something wrong. Is it ok to disable it to hide the problem lying
> somewhere else? Do you think it can be because of sync-isync
> instructions and moving to 2.6 might resolve it?
>
>
> On 9/20/06, Liu Dave-r63238 <DaveLiu@freescale.com> wrote:
> >
> >
> > No MSR is 00029030 and user mode bit is not set here.
> >
> > I had missed it in the prev mail:
> >
> > \x05NIP: C0005DA4 XER: 20000000 LR: C0004FE4 SP: C01F3000\x05 REGS: c01eff30
> > TRAP: 1020    Not tainted
> > MSR: 00029030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
> > TASK = c01f1080[0] 'swapper' Last syscall: 120
> > last math 00000000 last altivec 00000000
> > \x05PLB0: bear= 0x08000000 acr=   0xbb000000 besr=  0x00000000
> >
> > Dave>I notice that MSR and TRAP, MSR is 00029030- the critical interrupt
> > enable.
> > Dave>TRAP is 1020. --WatchDog timer exception is happening
> > Dave>You can disable the MSR[CE] bit to no critical exception or disable
> > the WD timer
> >
> >
> >
> > On 9/20/06, Linas Vepstas <linas@austin.ibm.com > wrote:
> > >
> > > On Thu, Sep 21, 2006 at 08:38:13AM +1000, Benjamin Herrenschmidt
> > > wrote:
> > > > On Wed, 2006-09-20 at 15:31 -0700, Manoj Sharma wrote:
> > > > > This is the stack trace.
> > > > >
> > > > > Registers:
> > > > > GPR00: 00069030
> > >
> > > This is the MSR and it has the user-mode bit set, which is surely
> > > wrong.
> > > This is not how one gets to user space.
> > >
> > > 00048000
> > >
> > > The MSR had this or'ed into it, which is setting the user-mode bit.
> > > Surely that's wrong.
> > >
> > > --linas
> > >
> >
> >
>

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