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kern/51148: i386 install floppies no longer boot

>Number:         51148
>Category:       kern
>Synopsis:       i386 install floppies no longer boot
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 17 13:00:00 +0000 2016
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2016.

System: NetBSD
Architecture: i386
Machine: i386

The automated i386 tests on babylon5 are failing at the install stage,
hanging immediately after the kernel load.

The problem started with one of the following commits:

  2016. chs src/external/cddl/osnet/dev/dtrace/amd64/dtrace_isa.c 1.5
  2016. chs src/external/cddl/osnet/dev/dtrace/i386/dtrace_asm.S 1.4
  2016. chs src/external/cddl/osnet/dev/dtrace/i386/dtrace_isa.c 1.4
  2016. chs src/external/cddl/osnet/dist/uts/common/dtrace/dtrace.c 1.31
  2016. mlelstv src/doc/roadmaps/storage 1.14
  2016. maxv src/sys/arch/amd64/amd64/locore.S 1.91
  2016. maxv src/sys/arch/i386/i386/locore.S 1.123
  2016. maxv src/sys/arch/amd64/amd64/locore.S 1.92
  2016. maxv src/sys/arch/i386/i386/locore.S 1.124
  2016. maxv src/sys/arch/amd64/amd64/machdep.c 1.217
  2016. maxv src/sys/arch/i386/i386/machdep.c 1.755
  2016. maxv src/sys/arch/x86/x86/pmap.c 1.195
  2016. skrll src/sys/dev/ic/sl811hs.c 1.71
  2016. skrll src/sys/dev/ic/sl811hs.c 1.72
  2016. chs src/sys/arch/i386/include/asm.h 1.42

I can't auto-bisect it more closely because of build breakage.
For log data, see

It looks like the problem only affects installing from floppies and
not installing from a CD, based on some separate tests I did on my
own testbed.



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