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SubjectRe: Freeze on FPU exception with Athlon

--- Linus Torvalds <> 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.

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


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