[lttng-dev] lttng-sessiond: ht-cleanup.c:92: thread_ht_cleanup: Assertion `pollfd == ht_cleanup_pipe[0]' failed.

David Goulet dgoulet at efficios.com
Thu Apr 3 10:32:16 EDT 2014

On 20 Mar (13:54:55), Gerlando Falauto wrote:
> Hi,
> I'm trying to bring lttng-tools up to date, but I get the following message:
> lttng-sessiond: ht-cleanup.c:92: thread_ht_cleanup: Assertion `pollfd ==
> ht_cleanup_pipe[0]' failed.
> I noticed this was already filed as a bug:
> http://redmine.dorsal.polymtl.ca/issues/747
> I tried implementing the solution proposed on the comment:
> >We should add a check to see if the revent is 0 at the beginning of
> >the loop, and continue to the next loop iteration if it is the case.
> But this doesn't seem to help.
> Any suggestion?

Sorry for the delay!

An approach here to debug this would be to first compile with -O0 to
remove any optimization from the compiler (simply add this to CFLAGS in

Then, have some printf() that prints the revents + pollfd at each
iteration and see why revents == 0 is not enough.

As stated in the bug report, poll() will make the loop iterate over all
fd thus this assert() is a bit hardcore considering that we didn't check
if an event was triggered before.

Please if you work on that, update the ticket so we can track the
progress! :)


> Thank you,
> Gerlando
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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