09:00 <danielmeirdoron> hi, is it ok to post newb questions here?

09:04 <danielmeirdoron> i have a problem, I am using systemtap version 2.9/0.165, Debian version 2.9-2ubuntu2 (xenial), and I use the -o flag to send output to a named pipe (/tmp/tun), however as soon as the reader on the other side is closing its end, the whole stap goes down as if it was finished....why?

09:06 <danielmeirdoron> since my stap ko is gonna run a very long time, I don't want to have all data written to a file which will grow endlessly, so I though using a named pipe.

09:57 <danielmeirdoron> i have a problem, I am using systemtap version 2.9/0.165, Debian version 2.9-2ubuntu2 (xenial), and I use the -o flag to send output to a named pipe (/tmp/tun), however as soon as the reader on the other side is closing its end, the whole stap goes down as if it was finished....why? since my stap ko is gonna run a very long time, I don't want to have all data written to a file which will grow endlessly, so I though using a named pipe.

10:29 <danielmeirdoron> ok ,so I straced staprun, the problem is that when I close the reading end, it receives a SIGPIPE which by default causes process termination. so, apparently no support for output to pipes in Systemtap

12:18 <modem_> fche: hi

12:19 <modem_> did try this, (the cast with "kernel/") didn't worked neither, i found a workaround meanwhile

12:19 <modem_> i have no idee why i cannot cast to this module's structure

12:19 <modem_> i should give it a try again a bit later

12:19 <modem_> /tmp/stapqePMxL/stap_219d3326f306154964469ff308ff5723_3222_src.c:262:11: error: implicit declaration of function ‘page_to_virt’ [-Werror=implicit-function-declaration]

12:19 <modem_> i am running in a new problem today

12:20 <modem_> in some C embedded code i have no way to use page_to_virt() macro, i added a %{ #include <linux/mm.h> %} previously to that line where it is supposed to be declared

12:26 <modem_> ok i figured a workaround gain

12:26 <modem_> again

12:26 <modem_> but i have no idee why i cannot use this macro

12:26 <modem_> i upgraded to 3.0 meanwhile, not working

13:23 <lzap> hey guys, I am peeking into a ruby (Rails) app and it worked quite well but with newer version of the app, I am getting user string copy fault -14 at 000000000042f16c near identifier 'user_string_n'...

13:23 <lzap> tried --skip-badvars but it did not change a thing

13:33 <lzap> it goes like this:

13:33 <lzap> ERROR: user string copy fault -14 at 0000000001a9e310 [man error::fault] near identifier 'user_string_n' at /usr/share/systemtap/tapset/uconversions.stp:133:10

13:41 <lzap> wow I changed user_string to user_string_warn in /opt/rh/rh-ruby22/root/usr/share/systemtap/tapset/libruby.so.2.2.stp and it works

13:42 <lzap> I dont know what I am doing to be honest but it works

13:58 <drsmith> lzap: so are you getting a warning now?

13:59 <drsmith> normally I'd say your user string copy fault error was because that memory wasn't paged in yet, but I'm not sure that address looks valid

14:00 <drsmith> in theory, all you did by changing user_string to user_string_warn would be get a warning on a copy fault instead of an error

14:45 <lzap> drsmith: yeah it looks like it thanks