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From: Anton Blanchard on 10 May 2010 19:10

Most distros turn the console verbosity down and that means a backtrace after
a panic never makes it to the console. I assume we haven't seen this because
a panic is often preceeded by an oops which will have called console_verbose.
There are however a lot of places we call panic directly, and they are
broken.

Use console_verbose like we do in the oops path to ensure a directly called
panic will print a backtrace.

Signed-off-by: Anton Blanchard <anton(a)samba.org>
---

Index: linux-2.6/kernel/panic.c
===================================================================
--- linux-2.6.orig/kernel/panic.c 2010-05-09 09:13:06.000000000 +1000
+++ linux-2.6/kernel/panic.c 2010-05-09 09:14:13.000000000 +1000
@@ -87,6 +87,7 @@ NORET_TYPE void panic(const char * fmt,
*/
preempt_disable();

+ console_verbose();
bust_spinlocks(1);
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
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