DragonFly kernel List (threaded) for 2007-08
Re: URGENT: [diagnostic] cache_lock: blocked on 0xda5265a8 ""
Matthew Dillon wrote:
:cache block thing is the only thing showing up in dmesg when processes
I dont see any disk hangs (no wchan's are in the bio subsystem). You
may have found a namecache deadlock but I can't track it down without
a kernel core and it sounds like you need physical access to do one
safely, unless you have a remote power cycler on the box too.
What you could try, however, is to write the contents of /dev/mem to a file. If that succeeds, maybe there are chances that we can construct a more-or-less-working kernel core. Remote access running kgdb might be a better solution (i.e. let Matt login and run kgdb on the live system).
So maybe try this (huge result):
dd if=/dev/mem of=filename bs=1M
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