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* problem with function_graph self-test?
@ 2009-06-16 18:26 Jake Edge
  2009-06-16 18:37 ` Steven Rostedt
  2009-06-18  3:24 ` Steven Rostedt
  0 siblings, 2 replies; 11+ messages in thread
From: Jake Edge @ 2009-06-16 18:26 UTC (permalink / raw)
  To: Steven Rostedt, linux-kernel; +Cc: Ingo Molnar

Hi Steve,

This has taken me a bit to track down ... I built a kernel from Linus's
git tree (as of this morning: commit
03347e2592078a90df818670fddf97a33eec70fb) and when i boot it, it locks
up hard giving me a cursor in the upper left (which seems to grow then
shrink once, if that tells anyone anything) and no other output ... i
started messing with kernel params (turning off quiet, rhgb, adding
boot_delay and, eventually figuring out i needed lpj as well) to try
and extract some info ... it seems to reliably fail in the
function_graph tracer self-test with a variety of messages (I
unfortunately don't have a serial console on the laptop that I am
using) ... two of the messages that I got (possibly from different
boots):

BUG: unable to handle kernel NULL pointer dereference at 00000048
BUG: Function graph tracer hang!

I can try and get more information, but I wanted to check first if you
already know about this ... somehow i'll either need to type faster :)
or reliably slow it down and take pictures, which I can do if you'd
like ...

obviously, for my purposes, i can turn off the selftests and/or the
function_graph tracer ...

jake

-- 
Jake Edge - LWN - jake@lwn.net - http://lwn.net

^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2009-06-19  0:32 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-06-16 18:26 problem with function_graph self-test? Jake Edge
2009-06-16 18:37 ` Steven Rostedt
2009-06-16 19:04   ` Jake Edge
2009-06-16 20:01     ` Steven Rostedt
2009-06-16 20:08       ` Frederic Weisbecker
2009-06-18  3:24 ` Steven Rostedt
2009-06-18  3:43   ` Jake Edge
2009-06-18  3:52     ` Steven Rostedt
2009-06-18  4:34     ` Steven Rostedt
2009-06-19  0:29   ` Jeremy Fitzhardinge
2009-06-19  0:32     ` Steven Rostedt

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