From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org
X-Spam-Level: 
X-Spam-Status: No, score=-3.3 required=5.0 tests=MAILING_LIST_MULTI,
	RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,
	T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4
Received: (qmail 23761 invoked from network); 4 Jan 2024 14:48:26 -0000
Received: from second.openwall.net (193.110.157.125)
  by inbox.vuxu.org with ESMTPUTF8; 4 Jan 2024 14:48:26 -0000
Received: (qmail 22429 invoked by uid 550); 4 Jan 2024 14:47:06 -0000
Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm
Precedence: bulk
List-Post: <mailto:musl@lists.openwall.com>
List-Help: <mailto:musl-help@lists.openwall.com>
List-Unsubscribe: <mailto:musl-unsubscribe@lists.openwall.com>
List-Subscribe: <mailto:musl-subscribe@lists.openwall.com>
List-ID: <musl.lists.openwall.com>
Reply-To: musl@lists.openwall.com
Received: (qmail 22393 invoked from network); 4 Jan 2024 14:47:06 -0000
Date: Thu, 4 Jan 2024 15:48:11 +0100
From: Szabolcs Nagy <nsz@port70.net>
To: Cody Wetzel <codyawetzel@gmail.com>
Cc: Natanael Copa <ncopa@alpinelinux.org>, musl@lists.openwall.com,
	Markus Wichmann <nullplan@gmx.net>
Message-ID: <20240104144811.GO1427497@port70.net>
Mail-Followup-To: Cody Wetzel <codyawetzel@gmail.com>,
	Natanael Copa <ncopa@alpinelinux.org>, musl@lists.openwall.com,
	Markus Wichmann <nullplan@gmx.net>
References: <CAFj3ykfSQLcXxTKq3R=eWmgC9txKGmMwovkWGyXYgRQHRqyw9Q@mail.gmail.com>
 <ZYPv2tTu9NR5UCpL@voyager>
 <CAFj3ykeyNgBzPFuAwE8djgQcgiZ--JTNgOUaTN2ERErOcZMkCQ@mail.gmail.com>
 <20231221222513.799557a1@ncopa-desktop.lan>
 <CAFj3yke_pv=bzbfDeA07-dYORYzU_fLAdwbwQbOL-Q-w+hYkHQ@mail.gmail.com>
 <CAFj3ykcn8F0w-Wkki4eZQ6-vDiz4oo9ZjhMiM41KJa=PR11eZA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAFj3ykcn8F0w-Wkki4eZQ6-vDiz4oo9ZjhMiM41KJa=PR11eZA@mail.gmail.com>
Subject: Re: [musl] Segmentation fault musl 1.2.4

* Cody Wetzel <codyawetzel@gmail.com> [2024-01-03 11:20:29 -0600]:
> Hello musl team,
> 
> I tried getting a core dump but I'm not sure if I'm doing something wrong...
> 
> / # cat /proc/sys/kernel/core_pattern/tmp/core-%e-%s-%u-%g-%p-%t/ #
> apk upgrade busybox
> --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main
> --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/communityfetch
> https://dl-cdn.alpinelinux.org/alpine/v3.18/community/armv7/APKINDEX.tar.gzfetch
> https://dl-cdn.alpinelinux.org/alpine/v3.18/main/armv7/APKINDEX.tar.gzfetch
> https://dl-cdn.alpinelinux.org/alpine/v3.17/main/armv7/APKINDEX.tar.gzfetch
> https://dl-cdn.alpinelinux.org/alpine/v3.17/community/armv7/APKINDEX.tar.gz(1/3)
> Upgrading busybox (1.35.0-r29 -> 1.36.1-r5)Executing
> busybox-1.36.1-r5.post-upgrade(2/3) Upgrading busybox-binsh
> (1.35.0-r29 -> 1.36.1-r5)(3/3) Upgrading ssl_client (1.35.0-r29 ->
> 1.36.1-r5)Executing busybox-1.36.1-r5.triggerOK: 5 MiB in 15 packages/
> # apk upgrade musl
> --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main
> --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/community(1/1)
> Upgrading musl (1.2.3-r5 -> 1.2.4-r2)OK: 5 MiB in 15 packages/ # apk
> upgrade rust --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main
> --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/communitySegmentation
> fault/ # apk -hSegmentation fault/ # ls /tmp/core*Segmentation fault/
> # cd /tmp/tmp # lsSegmentation fault

i'd

# cp /lib/ld-musl-armhf.so.1 /tmp
# apk add gdb musl-dbg apk-tools-static

then upgrade musl using apk.static, then debug via

# /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args ls -l /tmp

or analyze a core dump, you can always install more debug tools
via apk.static and run commands using the old ld-musl-armhf.so.1

in gdb, you want to do

bt
disas $pc-40,+80
info reg
info proc map

as a starting point and post the results.

strace output can be useful too as well as readelf -aW of ld.so
depending on what is going on.