Re: Freeze on FPU exception with Athlon

[Markus Schoder <markus_schoder@yahoo.de>]

--- Linus Torvalds <torvalds@transmeta.com> wrote: > 

> If I'm right, the proper test-program should be
> something like
> 

Your test program is indeed sufficient to trigger the
freeze.  Unfortunately the patch does not make a
difference :(

My test program caused the exception (and the freeze)
unintendedly in the return statement since the
division was optimized away as Brian pointed out.

Some more data points:

SysRq is definitely not working after the freeze :(
Judging from the processor temperature after rebooting
the processor is very busy.

I know of another guy with the exact same CPU (Athlon
Thunderbird 900MHz) and mainboard (ABIT KT7-RAID) who
has the same problem.

I use gcc 2.95.2 to compile the kernel.

I couldn't so far find out where the problem was
introduced since the older 2.4.0-test kernels do not
support the HPT370.  I will recable the drive to the
primary controller and try again.

I will also try to compile a non AMD specific kernel
and see if that makes a difference.  If just this 40GB
drive would fsck faster :)

Note that cpuinfo shows model 4 whereas e.g. Brian had
model 2 if that means anything.

/proc/cpuinfo:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 4
model name      : AMD Athlon(tm) Processor
stepping        : 2
cpu MHz         : 900.000063
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
features        : fpu vme de pse tsc msr pae mce cx8
sep mtrr pge mca cmov pat pse36 mmx fxsr syscall
mmxext 3dnowext 3dnow
bogomips        : 1795.69


--
Markus


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