Re: Math errors

[Alistair Francis <alistair23@gmail.com>]

On Mon, Jan 6, 2020 at 5:29 PM Jim Wilson <jimw@sifive.com> wrote:
>
> On Thu, Jan 2, 2020 at 6:18 PM Alistair Francis <alistair23@gmail.com> wrote:
> > There are a handful of math tests that seem to fail, but if I manually
> > run the test a few times I will eventually get a pass. Any hints on
> > what to do there?
>
> There is a known bug in the RISC-V linux port where FP regs can leak
> across fork and exec.  This is normally not a fatal problem, except
> for some tests that assume that the FP exception flags are clear on
> program start.  This can be false if they were set in the parent
> process, which can cause some glibc math test failures.  This can
> result in failures that appear/disappear when run manually versus from
> the testsuite driver.  There are only about 5 tests that are affected.
> The bug was finally fixed about a year and a half after I first
> reported it.  That happened only a few months ago.  If you don't have
> a recent enough version of the linux kernel you may not have the fix.

Thanks for that Jim.

I have the latest 5.4.x kernel, I'm not sure if that has it or not.

I see a lot of math failures, so I'm not sure if it's the same issue.

Right now I have all of these failing:

    FAIL: math/atest-exp
    FAIL: math/atest-exp2
    FAIL: math/atest-sincos
    FAIL: math/test-double-cacos
    FAIL: math/test-double-cosh
    FAIL: math/test-double-fromfpx
    FAIL: math/test-double-islessgreater
    FAIL: math/test-double-iszero
    FAIL: math/test-double-jn
    FAIL: math/test-double-llrint
    FAIL: math/test-double-log1p
    FAIL: math/test-double-ufromfp
    UNSUPPORTED: math/test-fesetexcept-traps
    UNSUPPORTED: math/test-fexcept-traps
    FAIL: math/test-float-cabs
    FAIL: math/test-float-ilogb
    FAIL: math/test-float-isnormal
    FAIL: math/test-float-ldouble-div
    FAIL: math/test-float128-fmod
    FAIL: math/test-float128-iseqsig
    FAIL: math/test-float128-ufromfpx
    FAIL: math/test-float32-catan
    FAIL: math/test-float32-csinh
    FAIL: math/test-float32-float64x-add
    FAIL: math/test-float32-iszero
    FAIL: math/test-float32-jn
    FAIL: math/test-float32-significand
    FAIL: math/test-float32-sincos
    FAIL: math/test-float32-tanh
    FAIL: math/test-float32-yn
    FAIL: math/test-float32x-asinh
    FAIL: math/test-float32x-exp
    FAIL: math/test-float32x-log10
    FAIL: math/test-float32x-yn
    FAIL: math/test-float64-asinh
    FAIL: math/test-float64-canonicalize
    FAIL: math/test-float64-getpayload
    FAIL: math/test-float64-j1
    FAIL: math/test-float64-jn
    FAIL: math/test-float64x-cexp
    FAIL: math/test-float64x-ctanh
    FAIL: math/test-idouble-acos
    FAIL: math/test-idouble-catanh
    FAIL: math/test-idouble-copysign
    FAIL: math/test-idouble-csinh
    FAIL: math/test-idouble-erf
    FAIL: math/test-idouble-fminmag
    FAIL: math/test-idouble-hypot
    FAIL: math/test-idouble-lgamma
    FAIL: math/test-idouble-log1p
    FAIL: math/test-idouble-setpayload
    FAIL: math/test-ifloat-cacos
    FAIL: math/test-ifloat-cacosh
    FAIL: math/test-ifloat-casin
    FAIL: math/test-ifloat-erf
    FAIL: math/test-ifloat-llround
    FAIL: math/test-ifloat-pow
    FAIL: math/test-ifloat-setpayload
    FAIL: math/test-ifloat-sincos
    FAIL: math/test-ifloat-tan
    FAIL: math/test-ifloat-tgamma
    FAIL: math/test-ifloat128-ctan
    FAIL: math/test-ifloat128-j0
    FAIL: math/test-ifloat32-clog10
    FAIL: math/test-ifloat32-issignaling
    FAIL: math/test-ifloat32x-cpow
    FAIL: math/test-ifloat32x-fmaxmag
    FAIL: math/test-ifloat32x-j0
    FAIL: math/test-ifloat32x-remainder
    FAIL: math/test-ifloat64-cexp
    FAIL: math/test-ifloat64-floor
    FAIL: math/test-ifloat64-fmod
    FAIL: math/test-ifloat64-lrint
    FAIL: math/test-ifloat64-sincos
    FAIL: math/test-ildouble-lgamma
    FAIL: math/test-ldouble-exp
    FAIL: math/test-ldouble-fmod
    FAIL: math/test-ldouble-ilogb
    UNSUPPORTED: math/test-matherr
    UNSUPPORTED: math/test-matherr-2
    UNSUPPORTED: math/test-nearbyint-except-2

Alistair

>
> Jim