Date: Wed, 14 Dec 2016 11:49:26 -0800 From: "Steven G. Kargl" <kargl@troutmask.apl.washington.edu> To: freebsd-current@freebsd.org, markj@freebsd.org, kib@freebsd.org Subject: Revision 309657 to stack_machdep.c renders unbootable system Message-ID: <20161214194848.GA881@troutmask.apl.washington.edu>
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Well, after 3 days of bisection, I finally found the commit that renders my system unbootable. The system does not panic. It simply gets stuck in some state. Nonfunctional keyboard, so can't break into debugger. No serial console available. The verbose dmesg.boot for a working kernel from revision 309656 is at http://troutmask.apl.washington.edu/~kargl/freebsd/dmesg.309656.txt The kernel config file is at http://troutmask.apl.washington.edu/~kargl/freebsd/SPEW.txt In looking at /usr/src/UPDATING, there is no warning that one can create a boat anchor by upgrading to 309657. If compiling a kernel with 'options DDB' is no longer supported, this should be stated in UPDATING. Or, UPDATING should state that 'options DDB' requires 'options STACK'. Or, 'options DDB' should simply to the right thing and pull in whatever 'option STACK' does. -- Steve http://troutmask.apl.washington.edu/~kargl/ https://www.youtube.com/watch?v=6hwgPfCcpyQ
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