Messages in this thread | | | Date | Tue, 16 Jun 2009 12:26:03 -0600 | From | Jake Edge <> | Subject | problem with function_graph self-test? |
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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
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