On 22-Feb-01 The Hermit Hacker wrote:
>
> Okay, I have to pick up a NULL modem cable tomorrow and dive into this ...
> finally ...
>
> The various KTR_ that you mention below, these are kernel settings that I
> compile into the kernel?
Yes. You want this:
options KTR
options KTR_EXTEND
options KTR_COMPILE=0x1208
The mtx_quiet.patch is old and won't apply to current now I'm afraid.
> On Tue, 2 Jan 2001, John Baldwin wrote:
>
>>
>> On 02-Jan-01 The Hermit Hacker wrote:
>> >
>> > Over the past several months, as others have reported, I've been getting
>> > system hangs using 5.0-CURRENT w/ SMP ... I've got DDB enabled, but
>> > ctl-alt-esc doesn't break me to the debugger ...
>> >
>> > I'm not complaining about the hangs, if I was overly concerned, I'd run
>> > -STABLE, but I'm wondering how one goes about providing debug information
>> > on them other then through DDB?
>>
>> Not easily. :( If you can make the problem easily repeatable, then you can
>> try
>> turning on KTR in your kernel (see NOTES, you will need KTR_EXTEND), setting
>> up
>> a serial console that you log the output of, create a shell script that runs
>> the following commands:
>>
>> #!/bin/sh
>>
>> # Turn on KTR_INTR, KTR_PROC, and KTR_LOCK
>> sysctl -w debug.ktr_mask=0x1208
>> sysctl -w debug.ktr_verbose=2
>>
>> run_magic_command_that_hangs_my_machine
>>
>> and run the script. You probably want to run it over a tty or remote login
>> so
>> tthat the serial console output is just the logging (warning, it will be
>> very
>> verbose!). Also, you probably want to use
>> http://www.FreeBSD.org/~jhb/patches/mtx_quiet.patch to shut up most of the
>> irrelevant and cluttery mutex trace messages. Note that having this much
>> logging on will probably slow the machine to a crawl as well, so you may
>> have
>> to just start this up and go off and do something else until it hangs. :-/
>> Another alternative is to rig up a NMI debouncer and use it to break into
>> the
>> debugger. Then you can start poking around to see who owns sched_lock, etc.
>>
>> > Thanks ...
>>
>> --
>>
>> John Baldwin <[EMAIL PROTECTED]> -- http://www.FreeBSD.org/~jhb/
>> PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
>> "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
>>
>
> Marc G. Fournier ICQ#7615664 IRC Nick:
> Scrappy
> Systems Administrator @ hub.org
> primary: [EMAIL PROTECTED] secondary:
> scrappy@{freebsd|postgresql}.org
>
--
John Baldwin <[EMAIL PROTECTED]> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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