linux-kernel - how to debug watchdog reset problems

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Message-ID: <CANMsd02t5-ks-F5KtSrDfYxOVasLSN8vEuZR5vcj1_KVMDr5bQ@mail.gmail.com>
Date:	Fri, 10 Jul 2015 01:39:42 +0530
From:	Ryan <ryanphilips19@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: how to debug watchdog reset problems

Hello,

I am using a 3.10 kernel on a product. As soon as i get the shell
prompt is displayed - The serial console freezes indicating an
apparent hang
and watchdog does a hardware reset.

I wanted to check if there is a way of debugging such an issue. I know
that record saying "entering function" and "exiting function"
somewhere
in the memory which i could access after reset and then find out who
cause the freeze.

However, then i need to add such an instrumentation to the whole
kernel. which is very time consuming and a real pain.

Could anyone suggest a better way of debugging kernel freeze.

Thanks and Regards,
Ryan.
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