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    SubjectRe: [PATCH 4.9 000/105] 4.9.55-stable review
    On Thu, Oct 12, 2017 at 11:18 PM, Andreas Radke
    <andreas.radke@mailbox.org> wrote:
    > Building the 4.9.x kernel package for Arch Linux 4.9.55 gives this IPv4 error here:
    >
    > Job for dhcpd4.service failed because the control process exited with error code.
    > See "systemctl status dhcpd4.service" and "journalctl -xe" for details.
    > root@server64:/root # systemctl status dhcpd4.service
    > ● dhcpd4.service - IPv4 DHCP server
    > Loaded: loaded (/usr/lib/systemd/system/dhcpd4.service; enabled; vendor preset: disabled)
    > Active: failed (Result: exit-code) since Thu 2017-10-12 17:09:38 CEST; 8s ago
    > Process: 638 ExecStart=/usr/bin/dhcpd -4 -q -user dhcp -cf /etc/dhcpd.conf -pf /run/dhcpd4.pid (code=exited, status=1/FAILURE)
    >
    > Okt 12 17:09:38 server64 dhcpd[638]: If you think you have received this message due to a bug rather
    > Okt 12 17:09:38 server64 dhcpd[638]: than a configuration issue please read the section on submitting
    > Okt 12 17:09:38 server64 dhcpd[638]: bugs on either our web page at www.isc.org or in the README file
    > Okt 12 17:09:38 server64 dhcpd[638]: before submitting a bug. These pages explain the proper
    > Okt 12 17:09:38 server64 dhcpd[638]: process and the information we find helpful for debugging.
    > Okt 12 17:09:38 server64 dhcpd[638]:
    > Okt 12 17:09:38 server64 dhcpd[638]: exiting.
    > Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Control process exited, code=exited status=1
    > Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Failed with result 'exit-code'.
    > Okt 12 17:09:38 server64 systemd[1]: Failed to start IPv4 DHCP server.
    >
    > journalctl -xe
    > Okt 12 17:09:37 server64 systemd[1]: Starting IPv4 DHCP server...
    > -- Subject: Unit dhcpd4.service has begun start-up
    > -- Defined-By: systemd
    > -- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
    > --
    > -- Unit dhcpd4.service has begun starting up.
    > Okt 12 17:09:38 server64 dhcpd[638]: Internet Systems Consortium DHCP Server 4.3.6
    > Okt 12 17:09:38 server64 dhcpd[638]: Copyright 2004-2017 Internet Systems Consortium.
    > Okt 12 17:09:38 server64 dhcpd[638]: All rights reserved.
    > Okt 12 17:09:38 server64 dhcpd[638]: For info, please visit https://www.isc.org/software/dhcp/
    > Okt 12 17:09:38 server64 dhcpd[638]: Source compiled to use binary-leases
    > Okt 12 17:09:38 server64 dhcpd[638]: Wrote 0 deleted host decls to leases file.
    > Okt 12 17:09:38 server64 dhcpd[638]: Wrote 0 new dynamic host decls to leases file.
    > Okt 12 17:09:38 server64 dhcpd[638]: Wrote 16 leases to leases file.
    > Okt 12 17:09:38 server64 dhcpd[638]: Can't install packet filter program: Cannot allocate memory
    > Okt 12 17:09:38 server64 dhcpd[638]:
    > Okt 12 17:09:38 server64 dhcpd[638]: If you think you have received this message due to a bug rather
    > Okt 12 17:09:38 server64 dhcpd[638]: than a configuration issue please read the section on submitting
    > Okt 12 17:09:38 server64 dhcpd[638]: bugs on either our web page at www.isc.org or in the README file
    > Okt 12 17:09:38 server64 dhcpd[638]: before submitting a bug. These pages explain the proper
    > Okt 12 17:09:38 server64 dhcpd[638]: process and the information we find helpful for debugging.
    > Okt 12 17:09:38 server64 dhcpd[638]:
    > Okt 12 17:09:38 server64 dhcpd[638]: exiting.
    > Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Control process exited, code=exited status=1
    > Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Failed with result 'exit-code'.
    > Okt 12 17:09:38 server64 systemd[1]: Failed to start IPv4 DHCP server.
    > -- Subject: Unit dhcpd4.service has failed
    pls try revert:
    commit 02f7e4101092b88e57c73171174976c8a72a3eba
    Author: Eric Dumazet <edumazet@google.com>
    Date: Mon Oct 2 12:20:51 2017 -0700

    socket, bpf: fix possible use after free

    which caused a obvious issue in __sk_attach_prog():
    atomic_set(&fp->refcnt, 0); <----

    if (!sk_filter_charge(sk, fp)) {
    kfree(fp);
    return -ENOMEM;
    }

    bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
    {
    if (!atomic_inc_not_zero(&fp->refcnt)) <----
    return false;

    if (!__sk_filter_charge(sk, fp)) {
    sk_filter_release(fp);
    return false;
    }

    >
    >
    > All works well with version 4.9.54 here. Holding back 4.9.55 for now.
    >
    > -Andy
    > Arch Linux

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