From: Joe Birch <jbirch04@sbcglobal.net>
To: Linuxppc-embedded@ozlabs.org
Subject: user thread will occassionally get a mysterious floating point exception
Date: Wed, 30 Nov 2005 14:02:35 -0800 (PST) [thread overview]
Message-ID: <20051130220235.18496.qmail@web81002.mail.mud.yahoo.com> (raw)
user thread cores occassionally because of a floating
point exception
when the exception occurs it usually happens on
multiple threads, even across different processes
and they all have the same fpscr values.
As far as I can tell none of the applications are even
enabling the fp exceptions in the fpscr.
If fact the coredump shows the fp operation to be just
a 64bit move like lfd.
some details:
2.4.20 (I know i have to go to 2.6 i just can't
right now)
~300 threads
cpu : 8270
core clock : 450 MHz
CPM clock : 300 MHz
bus clock : 100 MHz
revision : 32.19 (pvr 8082 2013)
bogomips : 299.82
The various fpscr that have occurred:
0x6002c2ed 0110 0000 0000 0010 1100 0010 1110 1101
0xec1642e6 1110 1100 0001 0110 0100 0010 1110 0110
0x7649e0ea 0111 0110 0100 1001 1110 0000 1110 1010
0x6009c7ba 0110 0000 0000 1001 1100 0111 1011 1010
0xf30c346f 1111 0011 0000 1100 0011 0100 0110 1111
0xe833f39d 1110 1000 0011 0011 1111 0011 1001 1101
0xfdb3e1e3 1111 1101 1011 0011 1110 0001 1110 0011
I've put in debug to dump the thread_struct when the
exception occurs hoping to find a corruption of the
floating point registers but they look OK.
Any help is greatly appreciated
Joe
reply other threads:[~2005-11-30 22:02 UTC|newest]
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