Date: Mon, 20 Feb 1995 12:50:10 -0800 From: David Greenman <davidg@Root.COM> To: Bruce Evans <bde@freefall.cdrom.com> Cc: CVS-commiters@freefall.cdrom.com, cvs-sys@freefall.cdrom.com Subject: Re: cvs commit: src/sys/i386/isa icu.s Message-ID: <199502202050.MAA00171@corbin.Root.COM> In-Reply-To: Your message of "Mon, 20 Feb 95 12:35:26 PST." <199502202035.MAA06487@freefall.cdrom.com>
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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. Hmmm...this sounds like the same bug that is (was?) causing Larry McVoy's bw_tcp benchmark to 1) hang, and 2) after interrupting it the process would hang in the kernel bouncing between the low level AST processing and the upper layer TCP processing code. This didn't use to happen a few months ago - was something changed to cause this? -DG
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