From owner-freebsd-hackers@freebsd.org Wed Jan 24 02:54:04 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3A205EB5FCB for ; Wed, 24 Jan 2018 02:54:04 +0000 (UTC) (envelope-from darius@dons.net.au) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [150.101.137.131]) by mx1.freebsd.org (Postfix) with ESMTP id 5342D73B5E for ; Wed, 24 Jan 2018 02:54:02 +0000 (UTC) (envelope-from darius@dons.net.au) Received: from 124-169-232-53.dyn.iinet.net.au (HELO midget.dons.net.au) ([124.169.232.53]) by ipmail07.adl2.internode.on.net with ESMTP; 24 Jan 2018 13:23:54 +1030 Received: from midget.dons.net.au (localhost [127.0.0.1]) by midget.dons.net.au (8.15.1/8.14.9) with ESMTPS id w0O2rc2J033537 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Wed, 24 Jan 2018 13:23:49 +1030 (CST) (envelope-from darius@dons.net.au) Received: (from mailnull@localhost) by midget.dons.net.au (8.15.1/8.14.9/Submit) id w0O2nPD7030247 for ; Wed, 24 Jan 2018 13:19:25 +1030 (CST) (envelope-from darius@dons.net.au) X-Authentication-Warning: midget.dons.net.au: mailnull set sender to using -f Received: from [10.176.138.114] (ns.dons.net.au [10.0.2.1]) by ns.dons.net.au (envelope-sender ) (MIMEDefang) with ESMTP id w0O2nJPJ030244; Wed, 24 Jan 2018 13:19:25 +1030 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Subject: Re: examining Linux core file? From: "O'Connor, Daniel" In-Reply-To: Date: Wed, 24 Jan 2018 13:19:51 +1030 Cc: Konstantin Belousov , FreeBSD Hackers , Pedro Giffuni Content-Transfer-Encoding: quoted-printable Message-Id: <8ECC1C72-58D3-46D2-B577-22123C7A81DB@dons.net.au> References: <20180116095908.GQ1684@kib.kiev.ua> <32C3FADA-073C-4942-B12F-AEB7F345766E@dons.net.au> To: Chuck Tuffli X-Mailer: Apple Mail (2.3445.5.20) X-Spam-Score: -1 () No, score=-1.0 required=5.0 tests=ALL_TRUSTED, T_RP_MATCHES_RCVD autolearn=unavailable autolearn_force=no version=3.4.0 X-Scanned-By: MIMEDefang 2.75 on 10.0.2.1 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Jan 2018 02:54:04 -0000 > On 24 Jan 2018, at 11:15, Chuck Tuffli wrote: >>=20 >> Using ktrace / linux_kdump might help - or at least give some clues = as to where it's failing too. >=20 > The ktrace output is interesting. Is there any way to show the address > causing the segfault? Not AFAIK, because ktrace only knows about syscalls :( > dmesg shows: > pid 1123 (apt-get), uid 0: exited on signal 11 (core dumped) >=20 > ktrace shows: > ... > 1123 apt-get 1516724569.278210 CALL L64 = write(0x1,0x800644000,0x21) > 1123 apt-get 1516724569.284901 GIO L64 fd 1 wrote 33 bytes > "\rBuilding dependency tree... 50%\r" > 1123 apt-get 1516724569.291711 RET L64 write 33/0x21 > 1123 apt-get 1516724569.298353 CALL L64 = gettimeofday(0x7fffffffd410,0) > 1123 apt-get 1516724569.305308 RET L64 gettimeofday 0 > 1123 apt-get 1516724569.312174 PSIG L64 SIGSEGV SIG_DFL = code=3DSEGV_MAPERR > 1123 apt-get 1516724569.312183 NAMI L64 "apt-get.core" Looks pretty innocent.. :-/ -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C