 22 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
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.
|
 23 Mar 2022, Stefan Ritt, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
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
|
|
23 Mar 2022, Ivo Schulthess, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
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?
|
|
23 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
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.
|
|
24 Mar 2022, Stefan Ritt, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
> > ... instead of struggling with all your locks.
>
> it is better to have midas fully thread safe. ODB has been so for a long time,
|
|
24 Mar 2022, Konstantin Olchanski, Bug Fix, fix for event buffer corruption in bm_flush_cache()
|
> 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
|
|
25 May 2006, Konstantin Olchanski, Bug Fix, fix crash in xml odb load
|
There is a crash in odbedit when loading some xml odb files: a missing check for NULL pointer when
loading an array of strings and one of the array elements is blank. This check is present when loading
other string values. Here is the diff:
|
|
08 Jun 2006, Konstantin Olchanski, Bug Fix, fix compilation of musbstd.h, add it back to libmidas
|
I fixed the compilation of musbstd.h (it required -DHAVE_LIBUSB on Linux, but
nothing knew about defining it) and put musbstd.o back into libmidas (USB
support should be part of the standard base midas library). K.O. |
|
09 Jun 2006, Stefan Ritt, Bug Fix, fix compilation of musbstd.h, add it back to libmidas
|
> I fixed the compilation of musbstd.h (it required -DHAVE_LIBUSB on Linux, but
> nothing knew about defining it) and put musbstd.o back into libmidas (USB
> support should be part of the standard base midas library). K.O.
|
|
15 Aug 2022, Zaher Salman, Bug Report, firefox hangs due to mhistory
|
Firefox is hanging/becoming unresponsive due to javascript code. After stopping the script manually to get firefox back in control I have the following
message in the console
|
|
16 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
|
> Firefox is hanging/becoming unresponsive due to javascript code. After stopping the script manually to get firefox back in control I have the following
message in the console
>
|
|
16 Aug 2022, Zaher Salman, Bug Report, firefox hangs due to mhistory
|
> > Firefox is hanging/becoming unresponsive due to javascript code. After stopping the script manually to get firefox back in control I have the following
message in the console
> >
|
|
16 Aug 2022, Zaher Salman, Bug Report, firefox hangs due to mhistory
|
I found the bug. The problem is triggered by changing the firefox window. This calls a function that is supposed to change the size of the history plot
and it works well when the history plots are visible but not if the history plots are hidden in a javascript tab (not another firefox tab).
|
|
16 Aug 2022, Konstantin Olchanski, Bug Report, firefox hangs due to mhistory
|
> > > Firefox is hanging/becoming unresponsive due to javascript code.
>
> The URL (reachable only within PSI) is http://lem03.psi.ch:8081/?cmd=custom&page=Mudas
|
|
17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
|
The problem lies in your function mhistory_init_one() in Mudas.js:1965. You can only call "new MhistoryGraph(e)" with an element "e" which is something
like
|
|
17 Aug 2022, Zaher Salman, Bug Report, firefox hangs due to mhistory
|
> The problem lies in your function mhistory_init_one() in Mudas.js:1965. You can only call "new MhistoryGraph(e)" with an element "e" which is something
like
>
|
|
17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
|
> Some of my histories are placed in an IFrame object. I eventually realized that my code fails
> when it tries to resize a history which is placed in an invisible IFrame. I resolved the issue
> by making sure that I am resizing plots only if they are in a visible IFrame.
|
|
17 Aug 2022, Stefan Ritt, Bug Report, firefox hangs due to mhistory
|
> Some of my histories are placed in an IFrame object. I eventually realized that my code fails
> when it tries to resize a history which is placed in an invisible IFrame. I resolved the issue
> by making sure that I am resizing plots only if they are in a visible IFrame.
|
21 May 2024, Nikolay, Bug Report, experiment from midas/examples 
|
There are 2 bugs in midas/examples/experiment:
1) In fronted bank named "PRDC" is created for scaler event. But in analyzer
|
|
16 May 2023, Konstantin Olchanski, Bug Report, excessive logging of http requests
|
Our default configuration of apache httpd logs every request. MIDAS custom web pages can easily make a huge number of RPC calls creating a
huge log file and filling system disk to 100% capacity
|