Revision 309657 to stack_machdep.c renders unbootable system
Mark Johnston
markj at freebsd.org
Wed Dec 14 20:08:06 UTC 2016
On Wed, Dec 14, 2016 at 11:49:26AM -0800, Steven G. Kargl wrote:
> 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.
It is supported though - the point of that change was to fix a problem
that occurred when DDB is configured but STACK isn't. While testing I
tried every combination of the two options, and I just tried and
successfully booted a kernel with DDB and !STACK.
Does the kernel boot successfully if STACK is added to your
configuration?
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