NetBSD Problem Report #59161

From www@netbsd.org  Sun Mar  9 15:18:49 2025
Return-Path: <www@netbsd.org>
Received: from mail.netbsd.org (mail.netbsd.org [199.233.217.200])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256
	 client-signature RSA-PSS (2048 bits) client-digest SHA256)
	(Client CN "mail.NetBSD.org", Issuer "mail.NetBSD.org CA" (not verified))
	by mollari.NetBSD.org (Postfix) with ESMTPS id 02E151A9239
	for <gnats-bugs@gnats.NetBSD.org>; Sun,  9 Mar 2025 15:18:49 +0000 (UTC)
Message-Id: <20250309151847.500BC1A923C@mollari.NetBSD.org>
Date: Sun,  9 Mar 2025 15:18:47 +0000 (UTC)
From: thorpej@me.com
Reply-To: thorpej@me.com
To: gnats-bugs@NetBSD.org
Subject: lib/libc/gen/t_fpsetround test failures on Alpha
X-Send-Pr-Version: www-1.0

>Number:         59161
>Category:       port-alpha
>Synopsis:       lib/libc/gen/t_fpsetround test failures on Alpha
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-alpha-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 09 15:20:00 +0000 2025
>Originator:     Jason Thorpe
>Release:        NetBSD 10.1
>Organization:
RISCy Business
>Environment:
NetBSD avanti.ktnet 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/alpha/compile/GENERIC alpha

hw.model = AlphaStation 200 4/233
>Description:
avanti:thorpej 8$ ./t_fpsetround fpsetround_basic                              
t_fpsetround: WARNING: Running test cases without atf-run(1) is unsupported
t_fpsetround: WARNING: No isolation nor timeout control is being applied; you may get unexpected failures; see atf-test-case(4)
Illegal instruction 
avanti:thorpej 9$ ./t_fpsetround fpsetround_noftz 
t_fpsetround: WARNING: Running test cases without atf-run(1) is unsupported
t_fpsetround: WARNING: No isolation nor timeout control is being applied; you may get unexpected failures; see atf-test-case(4)
*** Check failed: /usr/src/tests/lib/libc/gen/t_fpsetround.c:174: machine runs flush-to-zero by default
*** Check failed: /usr/src/tests/lib/libc/gen/t_fpsetround.c:186: machine runs flush-to-zero after one fpsetround call
*** Check failed: /usr/src/tests/lib/libc/gen/t_fpsetround.c:192: machine runs flush-to-zero after two fpsetround calls
failed: 3 checks failed; see output for more details
avanti:thorpej 10$

This is almost certainly because this code doesn't properly integrate with the kernel's FP completion code, and fiddles with the FPCR directly.
>How-To-Repeat:
See above.
>Fix:
Consult the Alpha Architecture Reference Manual for all of the gory details.

Home	PR Database Search