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Message-ID: <20090616122603.6a628097@chukar> Date: Tue, 16 Jun 2009 12:26:03 -0600 From: Jake Edge <jake@....net> To: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org Cc: Ingo Molnar <mingo@...e.hu> Subject: problem with function_graph self-test? 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@....net - http://lwn.net -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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