freeze on OMAP4460, timestamps jumping

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Hi,

We have a OMAP4460 based platform running Android Jellybean. We have
observed that OMAP can totally freeze at times, leading to watchdog
reboot.

There are two test cases which consistently reproduce the problem
- Running Camera Preview
- copying large files to eMMC.

Both of the above test cases involve heavy DMA. So, we are suspecting
that crash may be related to some DMA processing/logic.

After the watchdog reboot, last_kmsg consistently show two things
- A sudden jump in timestamps prior to crash
- Unhandled Fault in the kernel logs. The fault type can vary, but
it's mostly one of the following
   - Unhandled fault: imprecise external abort (0x1406)
   - Unhandled fault: external abort on non-linefetch (0x1008)

>From last_kmsg, the PC/LR is mostly at omap4_prm_inst_read_inst_reg
and omap4_pwrdm_read_pwrst respectively. Sometimes at other places
(e.g. sched_clock )

Can someone suggest what might be causing this?

Regards,
Kunal
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