Issue #2927 has been reported by davshao.

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Bug #2927: e2a21467e1 Updates to show "4.7" and other changes to major headers 
should be temporarily suspended
http://bugs.dragonflybsd.org/issues/2927

* Author: davshao
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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commit 5d920ec6b97613f06aba4a09bfb91413b1fd93c3 Fix excessive ipiq recursion (2)
does not correct the problem I have observed on at least two machines that

make -j7 buildworld

locks up the machine.  (When using make buildworld I move /usr/obj/usr to start 
the build from scratch.)  On one machine there seems to be a reproducible lock 
up at

sh /usr/src/tools/install.sh -o root -g wheel -m 555  lto1 
/usr/obj/usr/src/ctools_x86_64_x86_64/usr/libexec/gcc50

Changes to major headers should be temporarily suspended until this problem is 
resolved, because I have observed that even

make quickworld

can fail to complete without lockup.  Someone using UFS as their filesystem may 
experience quite substantial filesystem corruption after a lockup.  By limiting 
changes to major headers, this gives the greatest chance of a successful make 
quickworld when this problem is finally resolved.






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