juice kirjoitti 2018-11-06 14:30:
Lennart Poettering kirjoitti 2018-11-06 12:27:
On Di, 06.11.18 11:57, juice (ju...@swagman.org) wrote:
Hi,
During the past half year I have seen systemd dump core three times
due
to what I suspect a hashmap corruption or race.
Each time it looks a bit different and is triggered by different
things
but it somehow centers on hashmap operations.
What would be the prefered way to debug this? I cannot add huge
logging
as this is something that happens once in a blue moon and always in
different compute nodes.
Is there some way I could easily test it by increasing the chance of
such
corruption/race happening?
This looks very much like a memory corruption of some sorts and
valgrind should be the tool of choice to track that down.
Lennart
Thanks tor the prompt reply, Lennart.
I agree; using valgrind indeed was something already considered,
however I
suspect it might add some overhead in systemd operation?
I have been trying to start systemd under valgrind but seems it is not a
trivial
task to do. Moreover, no searching has revealed a general receipe for
doing that
other than the advice in systemd README's to compile with
-Dvalgrind=true option.
So, where could I find information on how to set up memory corruption
debug on
a live system for testing?
- juice -
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