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Date: Mon, 20 Feb 1995 12:35:26 -0800
From: Bruce Evans <bde>
Message-Id: <199502202035.MAA06487@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/i386/isa icu.s
Sender: cvs-sys-owner@freebsd.org
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bde         95/02/20 12:35:25

  Modified:    sys/i386/isa icu.s
  Log:
  Fix restoring cpl in the swi_ast_phantom case.  The system sometimes
  returned to user mode without enabling ASTs.  The problem fixed itself
  at the next syscall or non-FPU trap, if any.  It hung the system for
  a test process that masked SIGFPE's and divided by zero.  The faulting
  division was returned to endlessly and this gave plently of opportunities
  for the swi_ast_phantom case to be reached; after it was reached the
  system hung because the ASTs for preemption and SIGINT handling were
  disabled.