Messages in this thread | | | Subject | Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y | From | Roland Dreier <> | Date | Thu, 14 Feb 2008 14:04:05 -0800 |
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> > The strange thing is that Ingo's patch to make cpu_clock() a NOP until > > after sched_init() didn't fix things for me...
> Very strange. I threw in an output line counter into the printk code() ... if I > disable the timestamps for the first 30 lines, then everything is good (so the > basic timestamping code does still work on ia64). But I would have thought > that Ingo's delay until sched_init() ought to be long enough too. Clearly I > need to figure out exactly what needs to be initialized to prevent the > hang/crash.
I guess sched_init() is too early... it does seem really strange to me, but I just double checked with Ingo's patch and it does indeed hang. The slow way to make progress is just to go through start_kernel() line-by-line and enable cpu_clock() at each stage, and see where it stops hanging. I'll give that a shot as a background process (my ia64 box takes quite a while to boot, so each test takes a long time but requires very little of my attention).
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