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List: freedesktop-dbus
Subject: Re: dbus_connection_send_with_reply_and_block eats 100% CPU then eventually times out
From: Ralf Habacker <ralf () habacker ! de>
Date: 2015-01-31 13:49:02
Message-ID: 54CCDD4E.9060505 () habacker ! de
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Am 31.01.2015 um 13:08 schrieb Alex Brooks:
>
> Hi Ralf,
>
> Do you have a wlan0 on that computer?
>
no, wlp3s0 .. need to use -i i wlps3so
>
> (also note that the method in question (signalpoll) is new in
> wpa_supplicant v2.3).
>
-> updated
+ need to run as root
> On 31 Jan 2015 19:27, "Ralf Habacker" <ralf@habacker.de
> <mailto:ralf@habacker.de>> wrote:
>
>
> Am 31.01.2015 um 05:04 schrieb Alex Brooks:
> > Hi,
> >
> > I've been fighting for a long time with what now looks like a
> libdbus
> > bug.
> > I have a cut-down test program which calls a dbus method of
> > wpa_supplicant at 100Hz, it does this happily for several hours then
> > at some point the behaviour changes: any future calls sit at
> 100% CPU
> > for 25sec then time out.
>
who eat's the cpu
- dbus-daemon
- wpa_supplicant
- your client app
>
> > I don't think the problem is on the wpa_supplicant side: other
> clients
> > can simultaneously make this call without any problems, and
> restarting
> > the client fixes it.
>
you did a strace of the related processes ?
>
> > [I'm running at 100Hz because the faster I run this loop, the
> faster> it reproduces the problem. CPU load sits below 20% before
> I hit the
> > bug].
>
the test case contains
while ( true ) {
...
usleep(0.1 * 1e6);
}
which is 10H z
got it running as root
Ralf
>
> >
> > I posted details and a sample program as a Qt bug report (I'm using
> > the QDBus wrapper and thought it might be a Qt bug initially):
> > https://bugreports.qt.io/browse/QTBUG-43550
> >
> > Does anyone have any thoughts?
> I compiled the testcase on opensuse 13.1 x86_64 and did run:
>
> sudo ./signalpoll
> getNetDevObjectPath(wlan0)
> getNetDevObjectPath : GetInterface result: QDBusMessage(type=Error,
> service="", error name="fi.w1.wpa_supplicant1.InterfaceUnknown", error
> message="wpa_supplicant knows nothing about this interface.",
> signature="", contents=([]) )
> terminate called after throwing an instance of 'std::string'
>
> Regards
> Ralf m
>
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<br>
<div class="moz-cite-prefix">Am 31.01.2015 um 13:08 schrieb Alex
Brooks:<br>
</div>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<p dir="ltr">Hi Ralf, </p>
<p dir="ltr">Do you have a wlan0 on that computer? <br>
</p>
</blockquote>
no, wlp3s0 .. need to use -i i wlps3so
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<p dir="ltr">
(also note that the method in question (signalpoll) is new in
wpa_supplicant v2.3).</p>
</blockquote>
-> updated<br>
+ need to run as root<br>
<br>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<div class="gmail_quote">On 31 Jan 2015 19:27, "Ralf Habacker"
<<a moz-do-not-send="true" href="mailto:ralf@habacker.de">ralf@habacker.de</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Am 31.01.2015 um 05:04 schrieb Alex Brooks:<br>
> Hi,<br>
><br>
> I've been fighting for a long time with what now looks
like a libdbus<br>
> bug.<br>
> I have a cut-down test program which calls a dbus method
of<br>
> wpa_supplicant at 100Hz, it does this happily for several
hours then<br>
> at some point the behaviour changes: any future calls sit
at 100% CPU<br>
> for 25sec then time out.<br>
</blockquote>
</div>
</blockquote>
who eat's the cpu <br>
- dbus-daemon<br>
- wpa_supplicant <br>
- your client app<br>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
> I don't think the problem is on the wpa_supplicant side:
other clients<br>
> can simultaneously make this call without any problems,
and restarting<br>
> the client fixes it.<br>
</blockquote>
</div>
</blockquote>
you did a strace of the related processes ? <br>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
> [I'm running at 100Hz because the faster I run this loop,
the faster> it reproduces the problem. CPU load sits below
20% before I hit the<br>
> bug].<br>
</blockquote>
</div>
</blockquote>
the test case contains <br>
<br>
while ( true ) {<br>
...<br>
usleep(0.1 * 1e6);<br>
}<br>
<br>
which is 10H z<br>
<br>
got it running as root<br>
<br>
Ralf <br>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
><br>
> I posted details and a sample program as a Qt bug report
(I'm using<br>
> the QDBus wrapper and thought it might be a Qt bug
initially):<br>
> <a moz-do-not-send="true"
href="https://bugreports.qt.io/browse/QTBUG-43550"
target="_blank">https://bugreports.qt.io/browse/QTBUG-43550</a><br>
><br>
> Does anyone have any thoughts?<br>
I compiled the testcase on opensuse 13.1 x86_64 and did run:<br>
<br>
sudo ./signalpoll<br>
getNetDevObjectPath(wlan0)<br>
getNetDevObjectPath : GetInterface result:
QDBusMessage(type=Error,<br>
service="", error
name="fi.w1.wpa_supplicant1.InterfaceUnknown", error<br>
message="wpa_supplicant knows nothing about this interface.",<br>
signature="", contents=([]) )<br>
terminate called after throwing an instance of 'std::string'<br>
<br>
Regards<br>
Ralf m<br>
</blockquote>
</div>
</blockquote>
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
</blockquote>
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