Date: Thu, 31 Mar 2016 19:38:24 -0700 From: "Lundberg, Johannes" <johannes@brilliantservice.co.jp> To: freebsd-hackers@freebsd.org Subject: Zero copy data transfer from Linuxulator to FreeBSD? Message-ID: <CAASDrVncEFU1tXxjEf3PuNSb8uLMbj_dZw9CbH1_79hk79TDDQ@mail.gmail.com>
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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:date:message-id:subject:from :to:content-transfer-encoding; bh=R2jE2RZ3Pi3IujN0GvHfVVdsNMGr29VRqCAw9KaoBIQ=; b=AAgcEyAVb/BtEixgXidl46lxAw8MZsm4NcuJSLNFpa3x4rhnJS9Hmo2D6HInGnYbUn fcMGGiF6mNPQcpIuj0OmDAi92QCmwG4gYDw7uEJ5AnqHcR8s9n6ffgcXRy5kKwzEZogB HXYq6UZ1NZQmUR2P2SdVEnzouxF7J0z5KMkqrwuX7kxxXQG8jMiqWSjlhUGXcLLgwGps l/u3UYGLlYIh0TWmMwSe9xp11PG7rRi8AzMEaNzeLew3Meq8xVa7UZj2brSPkrwe8sNF 1RRUzGQzmsvvqG+i78Kb2Muvz7VZ+g91Aj8bCfMWogfONByE0hJY6WSH2JCYogbWmXpt DsJg== X-Gm-Message-State: AD7BkJKZsnYuzdvUHSrM6WiH8IFExJIwZ1j+crQSoG9Vt4wqcmpOsUdjUsORNBgyRNRryCxcr9XKEGmTGUUJTg== MIME-Version: 1.0 X-Received: by 10.107.41.211 with SMTP id p202mr8644693iop.4.1459485919817; Thu, 31 Mar 2016 21:45:19 -0700 (PDT) Sender: jdavidlists@gmail.com Received: by 10.36.130.130 with HTTP; Thu, 31 Mar 2016 21:45:19 -0700 (PDT) Date: Fri, 1 Apr 2016 00:45:19 -0400 X-Google-Sender-Auth: l69pvbFhzeRFManpfDLdEDmTP2g Message-ID: <CABXB=RTHetL-mjehjSaTVT2ipLTQySE2Y8UCUQXcM7_hWV3g_Q@mail.gmail.com> Subject: Catching core files in read-only jails From: J David <j.david.lists@gmail.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Technical Discussions relating to FreeBSD <freebsd-hackers.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>; List-Post: <mailto:freebsd-hackers@freebsd.org> List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe> X-List-Received-Date: Fri, 01 Apr 2016 04:45:20 -0000 If an application is running on a production server in a read-only jail for security purposes, and it crashes occasionally due to some unknown bug, is there any way to catch a core file? Setting kern.corefile seems to still be relative to the jail. (Or, at least, no corefile is generated.) There are a lot of these processes and they don=E2=80=99t crash very often,= so leaving gdb attached isn=E2=80=99t really feasible either. (It=E2=80=99s b= een tried, but apparently requires a bit more luck than is currently in evidence.) Thusfar all attempts to get it to crash in a controlled/test environment have also been unsuccessful. Does anyone have any ideas for how to find out what=E2=80=99s causing the c= rash? Thanks for any advice!
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