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    SubjectRe: 2.6.17-rc5-mm1
    > Martin, is the box still somewhat operational after such a crash? If yes 
    > then we could use my crash-tracer to see the kernel function call
    > history leading up to the crash:
    > just apply the patch, accept the offered Kconfig defaults and it will be
    > configured to do the trace-crashes thing. Reproduce the crash and save
    > /proc/latency_trace - it contains the execution history leading up to
    > the crash. (on the CPU that crashes) Should work on i386 and x86_64.
    > the trace is saved upon the first crash or lockdep assert that occurs on
    > the box. (but you'll have lockdep disabled, so it's the crash that
    > matters)
    > if the box dies after a crash then there's a possibility to print the
    > execution history to the serial console - but that takes around 10-15
    > minutes even on 115200 baud. If you want/need to do this then edit
    > kernel/latency.c and change "trace_print_at_crash = 0" to
    > "trace_print_at_crash = 1".
    > (btw., the tracer has another neat feature as well: if a kernel crashes
    > or triple faults (and reboots) early during bootup, then the tracer can
    > be configured to print all function calls to the serial console, via
    > early_printk() - right when the function calls happen. I debugged
    > numerous nasty boot-time bugs via this. To set it, change
    > "print_functions = 0" to "print_functions = 1" in kernel/latency.c.)

    Looks cool, but we'll have to beg the IBM guys to run it, I don't have
    access to that box anymore. Dumping to serial console would be cool,
    even if it's slow (the test boxes all have that logged).


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      Last update: 2006-06-01 01:32    [W:0.052 / U:12.020 seconds]
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