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Fri, 21 Dec 2018 02:54:36 -0800

On 12/19/18 12:55 AM, Aurelien Jarno wrote:
> On 2018-12-18 22:11, Aurelien Jarno wrote:
>> On 2018-12-18 21:34, Aurelien Jarno wrote:
>>> Hi,
>>>
>>> On 2018-12-18 15:15, Tim Ruehsen wrote:
>>>> Package: libc6-armhf-cross
>>>> Version: 2.28-2cross2
>>>> Severity: normal
>>>>
>>>> Dear Maintainer,
>>>>
>>>> currently strerror(-3) sets errno unexpectedly to ENOMEM (12).
>>>>
>>>> The expected errno value would be either EINVAL or not touching errno
>>>> at all.
>>>>
>>>> This behavior is relatively new and causes some CI cross builds to fail.
>>>> The failing test is a gnulib test (test-strerror.c).
>>>>
>>>
>>> I can reproduce the issue with libc6-armhf-cross 2.28-2cross2 and
>>> qemu-arm-static 1:3.1+dfsg-1, but not with the same binary on real
>>> hardware nor on qemu-user-static 1:2.12+dfsg-3+b1. I would therefore
>>> think it's a qemu bug.
>>
>> Hmm, I am wrong, I can actually reproduce it with qemu-user-static
>> version 1:2.12+dfsg-3+b1. But I can't reproduce it on real hardware.
> 
> It seems to have been caused by this upstream patch:
> 
> | commit 1294b1892e19d70e9e4dca0a2f3e39497f262a42
> | Author: Wilco Dijkstra <wdijk...@arm.com>
> | Date:   Thu Mar 15 17:57:03 2018 +0000
> | 
> |     Add support for sqrt asm redirects
> |     
> |     This patch series cleans up the many uses of  __ieee754_sqrt(f/l) in 
> GLIBC.
> |     The goal is to enable GCC to do the inlining, and if this fails call the
> |     __ieee754_sqrt function.  This is done by internally declaring sqrt 
> with asm
> |     redirects.  The compat symbols and sqrt wrappers need to disable the 
> redirect.
> |     The redirect is also disabled if there are already redirects defined 
> when
> |     using -ffinite-math-only.
> |     
> |     All math functions (but not math tests, non-library code and libnldbl) 
> are
> |     built with -fno-math-errno which means GCC will typically inline sqrt 
> as a
> |     single instruction.  This means targets are no longer forced to add a 
> special
> |     inline for sqrt.
> |     
> |             * include/math.h (sqrt): Declare with asm redirect.
> |             (sqrtf): Likewise.
> |             (sqrtl): Likewise.
> |             (sqrtf128): Likewise.
> |             * Makeconfig: Add -fno-math-errno for libc/libm, but build 
> testsuite,
> |             nonlib and libnldbl with -fmath-errno.
> |             * math/w_sqrt_compat.c: Define NO_MATH_REDIRECT.
> |             * math/w_sqrt_template.c: Likewise.
> |             * math/w_sqrtf_compat.c: Likewise.
> |             * math/w_sqrtl_compat.c: Likewise.
> |             * sysdeps/i386/fpu/w_sqrt.c: Likewise.
> |             * sysdeps/i386/fpu/w_sqrt_compat.c: Likewise.
> |             * sysdeps/generic/math-type-macros-float128.h: Remove math.h and
> |             complex.h.
> 
> And more precisely by building libc with -fno-math-errno.

Thanks for looking into it.

How is the proceeding ? Is there enough info to fix (or report upstream)
? If not, what has to be done ?

Regards, Tim


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