(a) Linux kernel guys think that a hardcoded timeout is a systemd bug.

    https://lkml.org/lkml/2014/3/23/42

(b) The systemd guys think that kernel module loading takes more than
    30 seconds is a kernel module's bug. But Linux kernel guys won't
    be able to fix it immediately. Also, solution by updating firmware
    won't be acceptable because there will be users who can't update
    firmware for some reason.

    http://lists.freedesktop.org/archives/systemd-
devel/2014-March/018007.html

    The systemd guys suggest that adding OPTIONS+="event_timeout=120"
    to udev rules might help, but I don't think it will help.

    https://lkml.org/lkml/2014/3/22/207

(c) The LVM guys added OPTIONS+="event_timeout=180" before
    commit 786235ee was merged into Linux kernel.

    http://www.redhat.com/archives/lvm-
devel/2013-September/msg00036.html

(d) I tried to rebuild systemd package with longer timeout but I was
    unable to build it without build failures. Therefore, I opened a
    bug report in order to ask for systemd package with longer
    timeout, but no response so far.

    https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1297248

Well, it is unlikely that this situation is solved within 7 days.
I think that applying the patch in comment #48 as a
"[trusty] UBUNTU: SAUCE:" patch is the safest choice for 14.04 LTS
kernel.

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https://bugs.launchpad.net/bugs/1276705

Title:
  Kernel 3.13 fail to boot with LSI SAS1068E (Dell SAS 6/iR)

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