Re: [iPAQ] Scheduler bug

On Fri 10 Nov, Nick Bane wrote:
> Hi Jim,
>
> Further to my comments re "scheduler bug". Here is a pertinent fragment. It
> starts with my Login and ends with the start of a large burst of kernel
> complaint. It really does look like a kernel scheduler something. All I did
> to cause the fault was to wait for a few minutes.

Jim, just to back nick up on this, I have exactly the same problem (using the
2.44 versions of the files).

For some reason I haven't yet determined (error -3 when decompressing X
demonstration is reported) my X stuff doesn't startup (due to complaints
about binfmt-0000 module not being found) and this reveals the apparent
scheduler bug Nick describes. We just checked and I essentially get exactly
the same output, by simpy resetting the machine and waiting for a few mins.
 
The pertinent bits seem to be:
Handhelds Linux v0.16 (none) ttyS0

(none) login: h3600_flite_power: pwr=0 brightness=0 sizeof(req)=4
Scheduling in interrupt
kernel BUG at sched.c:698!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
*pgd = c015c001, *pmd = c015c001, *pte = c000308b, *ppte = c000300a
Internal error: Oops: 0
CPU: 0
pc : [<c001b6c0>] lr : [<c0026a38>]
sp : c1ff5d40 ip : c1ff5cfc fp : c1ff5d50
r10: 00000001 r9 : c0128eac r8 : 00000000
r7 : 000000c8 r6 : c0147d8c r5 : c1ff4000 r4 : 00000000
r3 : 00000000 r2 : 20000093 r1 : 20000093 r0 : 00000001
Flags: nZCv IRQs off FIQs on Mode SVC_32 Segment kernel
Control: C1D1D17D Table: C1D1D17D DAC: 0000001D
Process kapmd (pid: 2, stackpage=c1ff5000)
Stack:
c1ff5d20: c0026a38 c001b6c0 60000093 ffffffff
c1ff5d40: 0000eb28 c1ff5d7c c1ff5d54 c0023b58 c001b688 0000eb28 c1ff5d80 c0147d8c
<snip about 300K of stack trace and multiple repeats of the above until it
gives up with>

Aiee, killing interrupt handler
Kernel panic: Attempted to kill the idle task!
In interrupt handler - not syncing

I'm happy to do tests if you have clues as to what might be going wrong.
Neither or us are kernel gurus.

Wookey

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