NetBSD Problem Report #55843
From www@netbsd.org Sat Dec 5 08:33:24 2020
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Date: Sat, 5 Dec 2020 08:33:22 +0000 (UTC)
From: jbryn@students.wcpss.net
Reply-To: jbryn@students.wcpss.net
To: gnats-bugs@NetBSD.org
Subject: multimeda/ffmpeg4: SIGSEGV on ebml_parse and other routines on i386
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>Number: 55843
>Category: pkg
>Synopsis: multimeda/ffmpeg4: SIGSEGV on ebml_parse and other routines on i386
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: pkg-manager
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Dec 05 08:35:00 +0000 2020
>Originator: Jackson Bryn
>Release: NetBSD-current 9.99.76, pkgsrc/current 12/5/20
>Organization:
N/A
>Environment:
build.localdomain 9.99.76 NetBSD 9.99.76 (GENERIC) #0: Mon Nov 30 07:53:42 UTC 2020 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/i386/compile/GENERIC i386
>Description:
Tested on a Haswell in 32-bit mode.
Unsure what the exact situation is, but if I blank my CLFAGS additions to nothing but -pipe -fomit-frame-pointer, it works again.
Faulty CFLAGS additions:
CFLAGS += -O2 -pipe -march=bonnell -mtune=bonnell -mfpmath=sse -fomit-frame-pointer
Working CFLAGS additions:
CFLAGS += -pipe -fomit-frame-pointer
(Commenting out --disable-optimizations also seems to have no negative effects, by the way.)
>How-To-Repeat:
A simple method to reproduce is to copy a mp4 and an m4a to a matroska file.
>Fix:
It's best that we probably have ffmpeg4 override CFLAGS and optimizations on i386. I'm not sure if it happens on other arches.
(Contact us)
$NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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