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Hi Jonathan,</div>
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<br>
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I was indeed missing the /dev/shm mountpoint. After creating it everything now works as expected. Thanks!</div>
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<br>
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Regards</div>
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<p class="x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px;"><b><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:gray">Moritz Pflanzer</span></b><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:gray"><br>
Software Development Engineer<br>
</span><u><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:rgb(0,130,191)"><br>
</span></u><span style=""><img class="EmojiInsert" id="OWAPstImg328303" alt="cid:image001.png@01D3BF6E.185110B0" style="width:2.0833in; height:0.6458in" width="200" height="62" data-outlook-trace="F:1|T:1" src="cid:e1282fbe-17ea-4858-81f0-4c24ae9c31c7"></span><u><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:rgb(0,130,191)"></span></u></p>
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Räffelstrasse 28</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0; margin-bottom:0"><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:gray">8045 Zürich<b><br>
</b><b>E: </b><a href="mailto:moritz.pflanzer@hexagon.com" class="OWAAutoLink"><span style="color:rgb(0,111,201)">moritz.pflanzer@hexagon.com</span></a><b></b></span><span style=""><a href="mailto:carolin.siebert@hexagon.com" target="_blank" rel="noopener noreferrer"><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:rgb(5,99,193)"></span></a></span><b><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:gray"><br>
W: </span></b><span style=""><a href="http://www.hexagongeosystems.com" target="_blank" rel="noopener noreferrer"><span style="font-size:10pt; font-family:"Arial",sans-serif,serif,"EmojiFont"; color:rgb(5,99,193)">http://www.hexagongeosystems.com</span></a></span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com><br>
<b>Sent:</b> 04 August 2020 15:09<br>
<b>To:</b> PFLANZER Moritz <moritz.pflanzer@hexagon.com><br>
<b>Cc:</b> lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org><br>
<b>Subject:</b> Re: [lttng-dev] Help needed: No UST events recorded</font>
<div> </div>
</div>
<div class="BodyFragment"><font size="2"><span style="font-size:11pt;">
<div class="PlainText">This email is not from Hexagon’s Office 365 instance. Please be careful while clicking links, opening attachments, or replying to this email.<br>
<br>
<br>
Hi Moritz,<br>
<br>
>From the lttng-sessiond log:<br>
<br>
PERROR - 08:04:45.465478146 [575/575]: Failed to open wait shm at /lttng-ust-wait-8: Function not implemented (in get_wait_shm() at shm.c:98)<br>
DEBUG1 - 08:04:45.465496345 [575/575]: Failing to get the wait shm fd (in get_wait_shm() at shm.c:143)<br>
Error: Failed to notify applications or create the wait shared memory.<br>
Execution continues but there might be problems for already<br>
running applications that wishes to register.<br>
<br>
On the app side we see that the app never register:<br>
<br>
libust[694/694]: Error: Error opening shm /lttng-ust-wait-8-0 (in get_wait_shm() at lttng-ust-comm.c:1241)<br>
libust[694/694]: Warning: Unable to get map shm for local apps. Disabling LTTng-UST per-user tracing. (in setup_local_apps() at lttng-ust-comm.c:523)<br>
<br>
<br>
Does the /dev/shm mount point exist?<br>
Does your kernel support shared memory/tmpfs?<br>
<br>
Cheers<br>
<br>
On Tue, Aug 04, 2020 at 08:15:08AM +0000, PFLANZER Moritz wrote:<br>
> Hi Jonathan,<br>
><br>
> Apologies that I forgot to mention which version of LTTng I'm using. I didn't build from master but downloaded the latest release archives for LTTng 2.12 "(Ta) Meilleure". "lttng --version" reports a corresponding "lttng (LTTng Trace Control) 2.12.1 - (Ta)
Meilleure"<br>
><br>
> Please find the console log here: <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2FPVzqrPvr&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923510073&sdata=kpJmnfbLdWJXCElVkR7tcdSuVy%2FLeeZw9xaLnI3mHXY%3D&reserved=0">
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2FPVzqrPvr&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923510073&sdata=kpJmnfbLdWJXCElVkR7tcdSuVy%2FLeeZw9xaLnI3mHXY%3D&reserved=0</a><br>
> and the lttng-sessiond.log here: <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2Fg3aXAcQg&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923520068&sdata=hN4mc9XXz%2FBQQSm0NpjS94CHDanmESE6n9Jn5T4TVDQ%3D&reserved=0">
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpastebin.com%2Fg3aXAcQg&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923520068&sdata=hN4mc9XXz%2FBQQSm0NpjS94CHDanmESE6n9Jn5T4TVDQ%3D&reserved=0</a><br>
><br>
> Thanks,<br>
> Moritz<br>
><br>
><br>
><br>
> Moritz Pflanzer<br>
> Software Development Engineer<br>
><br>
> [cid:image001.png@01D3BF6E.185110B0]<br>
><br>
> Räffelstrasse 28<br>
><br>
> 8045 Zürich<br>
> E: moritz.pflanzer@hexagon.com<mailto:moritz.pflanzer@hexagon.com><mailto:carolin.siebert@hexagon.com><br>
> W: <a href="http://www.hexagongeosystems.com/">http://www.hexagongeosystems.com/</a><br>
><br>
> ________________________________<br>
> From: Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com><br>
> Sent: 03 August 2020 17:31<br>
> To: PFLANZER Moritz <moritz.pflanzer@hexagon.com><br>
> Cc: lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org><br>
> Subject: Re: [lttng-dev] Help needed: No UST events recorded<br>
><br>
> This email is not from Hexagon’s Office 365 instance. Please be careful while clicking links, opening attachments, or replying to this email.<br>
><br>
><br>
> Hi Moritz<br>
><br>
> What is your version of lttng-tools?<br>
><br>
> lttng --version<br>
><br>
> Please run the `hello` executable using the LTTNG_UST_DEBUG env variable, while<br>
> tracing, and provide the output.<br>
><br>
> pkill lttng-sessiond<br>
> lttng-sessiond -b -vvv --verbose-consumer 2> /tmp/lttng-sessiond.log<br>
> lttng create<br>
> lttng enable-event -u -a<br>
> lttng start<br>
> LTTNG_UST_DEBUG=y ./hello<br>
> lttng stop<br>
> lttng destroy<br>
> pkill lttng-sessiond<br>
><br>
> Please also provide the /tmp/lttng-sessiond.log file via pastebin.<br>
><br>
> I suspect that if you cross-compiled lttng-ust from the master branch that<br>
> lttng-tools is not using the same version, resulting in the application not<br>
> being able to register to the lttng-sessiond.<br>
><br>
> Cheers<br>
><br>
> On Mon, Aug 03, 2020 at 09:35:25AM +0000, PFLANZER Moritz via lttng-dev wrote:<br>
> > Hi all!<br>
> ><br>
> > I'm struggling to get userspace tracing working on an aarch64 platform (busybox on top of Linux 5.4.24 kernel). I followed the guidelines in the docs and am currently using this example program for testing:
<a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flttng%2Flttng-ust%2Ftree%2Fmaster%2Fdoc%2Fexamples%2Fhello-static-lib&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923520068&sdata=nbgcpqyriJ1kERRFLum2sH91yXi28hhfeN9lQ3OyfOc%3D&reserved=0">
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flttng%2Flttng-ust%2Ftree%2Fmaster%2Fdoc%2Fexamples%2Fhello-static-lib&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923520068&sdata=nbgcpqyriJ1kERRFLum2sH91yXi28hhfeN9lQ3OyfOc%3D&reserved=0</a><br>
> > I cross-compiled lttng-ust and that example, but when I run the following commands on the platform no traces are recorded. If I use the same example on my x86 machine everything works as expected. (And kernelspace tracing is working on that aarch64 system.)<br>
> ><br>
> > Any hints where I could start investigating the issue are welcome.<br>
> ><br>
> > Regards,<br>
> > Moritz<br>
> ><br>
> > ~ # pwd<br>
> > /root<br>
> > ~ # lttng create<br>
> > Spawning a session daemon<br>
> > Session auto-20200720-174509 created.<br>
> > Traces will be written in /root/lttng-traces/auto-20200720-174509<br>
> > ~ # lttng enable-event -au<br>
> > All UST events are enabled in channel channel0<br>
> > ~ # lttng start<br>
> > Tracing started for session auto-20200720-174509<br>
> > ~ # ./hello<br>
> > Hello, World!<br>
> > Tracing... done.<br>
> > ~ # lttng destroy<br>
> > Session auto-20200720-174509 destroyed<br>
> > ~ # ll<br>
> > total 40<br>
> > -rwxr-xr-x 1 root root 39280 Jul 20 17:44 hello*<br>
> ><br>
> ><br>
> ><br>
> > Moritz Pflanzer<br>
> > Software Development Engineer<br>
> ><br>
> > [cid:image001.png@01D3BF6E.185110B0]<br>
> ><br>
> > Räffelstrasse 28<br>
> ><br>
> > 8045 Zürich<br>
> > E: moritz.pflanzer@hexagon.com<mailto:moritz.pflanzer@hexagon.com><mailto:carolin.siebert@hexagon.com><br>
> > W: <a href="http://www.hexagongeosystems.com/">http://www.hexagongeosystems.com/</a><br>
><br>
><br>
><br>
> > _______________________________________________<br>
> > lttng-dev mailing list<br>
> > lttng-dev@lists.lttng.org<br>
> > <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.lttng.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Flttng-dev&data=02%7C01%7C%7C9bc88da99a1646d66d4408d83877ab9f%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637321433923520068&sdata=ci4daouTRyY%2BWzSjqVhrmjn11lhYHKs6lcR6kvqr370%3D&reserved=0">
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><br>
><br>
> --<br>
> Jonathan Rajotte-Julien<br>
> EfficiOS<br>
<br>
<br>
<br>
--<br>
Jonathan Rajotte-Julien<br>
EfficiOS<br>
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