Shutdown cleanup #98
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Shutdown cleanup #98
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added 4 commits
March 21, 2024 10:48
Once refcount reaches zero the conn data could be deallocated and then the refcond is not valid anymore. So always signal on this under the lock to avoid this race.
Do the cleanup of the connection thread in a callback function so we can cancel the thread using pthread_cancel().
The connection thread is detached so we cannot join it to wait for its compleation on shutdown. Use the conncount in server to keep track of when all connection threads have actually finished. To keep this safe we must wait to update this value until the thread has done all of its cleanup.
The conection threads are using the resources that are deallocated in the main diod thread. If they are not shut down cleanly before this deallocation we could get craches at shutdown due to this.
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Hi @bjornaxis - the fix is much appreciated! I hope to have time to review soon. I will have to refresh my memory on code I haven't looked at in a long time. Meanwhile, would you mind opening an issue on the crashes and provide any info you may have that would help me reproduce it? If you have any stack traces or other clues that would also be great to have. Note that CI being stuck is probably due to the ubuntu-18.04 runner not being available anymore on github (will fix). |
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Hi,
I have created issue #99 and tried to explain what is happening on a
higher level (and how to increase chances of provoking the error).
The errors I see is mostly asserts in liblsd/hash.c or normal segfaults.
Since this is a file-server and I access a lot of data to provoke it to
crash I am not sure if I can share any crash dumps since I do not know
what else could be in there (sorry).
/BA
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Hi,
We have had problems with diod crashing during shutdown and found out that there are races between thread shutdown and data deallocations.
I have made some patches here that I think solves it (at least we cannot trigger the crashes anymore).