From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/9338 Path: news.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: dynlink.c: bug in reclaim_gaps leading to segfault in __libc_exit_fini Date: Tue, 16 Feb 2016 17:02:09 -0500 Message-ID: <20160216220209.GA9349@brightrain.aerifal.cx> References: <20160216215550.GC9915@port70.net> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1455660149 27154 80.91.229.3 (16 Feb 2016 22:02:29 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 16 Feb 2016 22:02:29 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-9351-gllmg-musl=m.gmane.org@lists.openwall.com Tue Feb 16 23:02:25 2016 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1aVnhQ-0003pZ-GB for gllmg-musl@m.gmane.org; Tue, 16 Feb 2016 23:02:24 +0100 Original-Received: (qmail 15875 invoked by uid 550); 16 Feb 2016 22:02:22 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Original-Received: (qmail 15857 invoked from network); 16 Feb 2016 22:02:21 -0000 Content-Disposition: inline In-Reply-To: <20160216215550.GC9915@port70.net> User-Agent: Mutt/1.5.21 (2010-09-15) Original-Sender: Rich Felker Xref: news.gmane.org gmane.linux.lib.musl.general:9338 Archived-At: On Tue, Feb 16, 2016 at 10:55:50PM +0100, Szabolcs Nagy wrote: > * Hugues Bruant [2016-02-16 16:30:42 -0500]: > > Affects both 1.1.12 and 1.1.13 > > > > Tracked down with valgrind in Alpine Linux 3.3. > > > > The dmg tool build from https://github.com/aerofs/libdmg-hfsplus links to a > > handful shared libs. The following message is seen immediately at start: > > > > ==59== Invalid free() / delete / delete[] / realloc() > > ==59== at 0x4C92B0E: free (vg_replace_malloc.c:530) > > ==59== by 0x4056F68: reclaim_gaps (dynlink.c:488) > > ==59== by 0x405743D: map_library (dynlink.c:708) > > ==59== by 0x4057EF3: load_library (dynlink.c:1014) > > ==59== by 0x4058CA8: load_preload (dynlink.c:1112) > > ==59== by 0x4058CA8: __dls3 (dynlink.c:1581) > > ==59== by 0x405856A: __dls2 (dynlink.c:1383) > > ==59== by 0x405655E: ??? (in /lib/ld-musl-x86_64.so.1) > > ==59== by 0x3: ??? > > ==59== by 0xFFF000E3A: ??? > > ==59== by 0xFFF000E3E: ??? > > ==59== by 0xFFF000E44: ??? > > ==59== by 0xFFF000E86: ??? > > > > Afterwards, the program proceeds with no issue, until it exists, at which > > point a segfault is triggered when cleaning up shared libraries: > > > > this is not a bug. Well the crash is a bug, but it's not clear what the source of the bug is. > valgrind is not aware of dynamic linker internals, > you have to use a musl specific suppression file > to hide this message (but i dont know if anybody > wrote such thing for valgrind). Indeed, I'm not sure either. I've commented with some further ideas on the bug tracker. Rich