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    SubjectRe: ipc,sem: sysv semaphore scalability
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    Hi Davidlohr,

    On Sat, Mar 30, 2013 at 9:08 AM, Davidlohr Bueso <davidlohr.bueso@hp.com> wrote:
    > Not sure which one liner you refer to, but, if you haven't already done
    > so, please try with these fixes (queued in linux-next):
    >
    > http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=a9cead0347283f3e72a39e7b76a3cc479b048e51
    > http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=4db64b89525ac357cba754c3120065adddd9ec31
    >
    > I've been trying to reproduce your twilight zone problem on five
    > different machines now without any luck. Is there anything you're doing
    > to trigger the issue? Does the machine boot ok and then do weird things,
    > say after X starts, open some program, etc?

    I was missing a9cead0, thanks. What I usually do is starting a
    standard session, which looks like this:

    init-+-5*[agetty]
    |-bash---startx---xinit-+-X---2*[{X}]
    | `-dwm---sh---sleep
    |-bash---chromium-+-chromium
    | |-chromium-+-chromium
    | | `-2*[{chromium}]
    |
    |-chromium-sandbo---chromium---chromium---4*[chromium---4*[{chromium}]]
    | `-65*[{chromium}]
    |-crond
    |-dbus-daemon
    |-klogd
    |-syslogd
    |-tmux-+-alsamixer
    | |-bash---bash
    | |-bash
    | |-htop
    | `-newsbeuter---{newsbeuter}
    |-udevd
    |-urxvtd-+-bash---pstree
    | `-bash---tmux
    `-wpa_supplicant

    Then I start building a random package and the problems start. They
    may also happen without compiling but this seems to trigger the bug
    quite quickly. Anyway, some progress here, I hope: dmesg seems to be
    willing to reveal some secrets (using some pastebin service since this
    is pretty big):

    https://gist.github.com/anonymous/5275120

    Thanks.


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