 14 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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Just post here a minimal script which produces the error, so that I can try myself.
... and make sure that you have the latest develop version of midas.
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14 Feb 2022, jago aartsen, Bug Fix, ODBINC/Sequencer Issue
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> Just post here a minimal script which produces the error, so that I can try myself.
>
> ... and make sure that you have the latest develop version of midas.
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14 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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> I noticed that "Jacob Thorne" in the forum had the same issue as us in Novemeber last
> year. Indeed we have not installed any later versions of MIDAS since then so we will
> double check we have the latest version.
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14 Feb 2022, jago aartsen, Bug Fix, ODBINC/Sequencer Issue
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> > I noticed that "Jacob Thorne" in the forum had the same issue as us in Novemeber last
> > year. Indeed we have not installed any later versions of MIDAS since then so we will
> > double check we have the latest version.
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15 Feb 2022, Stefan Ritt, Bug Fix, ODBINC/Sequencer Issue
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> But the error still persists. Is there another way to update which we are missing?
The bug was definitively fixed in this modification:
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15 Feb 2022, jago aartsen, Bug Fix, ODBINC/Sequencer Issue
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> > But the error still persists. Is there another way to update which we are missing?
>
> The bug was definitively fixed in this modification:
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16 Feb 2022, jago aartsen, Bug Fix, ODBINC/Sequencer Issue
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> > But the error still persists. Is there another way to update which we are missing?
>
> The bug was definitively fixed in this modification:
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 15 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd ipv6 bind should be fixed now
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Something changed after my initial implementation of ipv6 in mhttpd
and listening to ipv6 http/https connections was broken.
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22 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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multithreaded frontends have an unusual event buffer corruption if the write
cache is enabled. For a long time now I had to disable the write cache on
all multithreaded frontends in alpha-g, I was hitting this bug quite often.
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22 Mar 2022, Stefan Ritt, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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Thanks Konstantin for your detailed description.
I wonder why we never saw this problem at PSI. Here is the reason: In multil-threaded environments, we never call bm_send_event() directly
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23 Mar 2022, Ivo Schulthess, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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Thanks for the investigation. Back in 2020, we had some issues of losing data between the system buffer and the logger writing them to disk (https://daq00.triumf.ca/elog-midas/Midas/1966).
This was polled equipment but we had a multithreaded FE running at the same time. Could this be related to the same problem?
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23 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd ipv6 bind should be fixed now
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> Something changed after my initial implementation of ipv6 in mhttpd
> and listening to ipv6 http/https connections was broken.
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23 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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I confirm, there is no problem in single-threaded programs, and
there is no problem if all bm_send_event() and bm_flush_cache() are called
from the same thread.
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23 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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the mhttpd bug should be fixed now (branch feature/buffer_mutex).
simplest way to reproduce:
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24 Mar 2022, Stefan Ritt, Bug Fix, mhttpd bug fixed
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> 1st wget stops (by ctrl-C), socket is closed, mongoose frees it's mg_connection object
> (corresponding worker is still labouring, hmm... actually sleeping, and now has a stale nc pointer)
>
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24 Mar 2022, Stefan Ritt, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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> > ... instead of struggling with all your locks.
>
> it is better to have midas fully thread safe. ODB has been so for a long time,
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24 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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> > 1st wget stops (by ctrl-C), socket is closed, mongoose frees it's mg_connection object
> > (corresponding worker is still labouring, hmm... actually sleeping, and now has a stale nc pointer)
> >
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24 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
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> Thanks for the investigation. Back in 2020, we had some issues
> of losing data between the system buffer and the logger writing them
> to disk (https://daq00.triumf.ca/elog-midas/Midas/1966). This was polled equipment
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24 Mar 2022, Stefan Ritt, Bug Fix, mhttpd bug fixed
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I see, now I understand.
As for the browser cache problem: This Chrome extension is your friend:
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24 Mar 2022, Konstantin Olchanski, Bug Fix, mhttpd bug fixed
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> As for the browser cache problem: This Chrome extension is your friend ...
for google chrome, it is easy, open the javascript debugger (left-click "inspect"),
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