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Core was generated by python3.9: middlewared (zettarepl)

Description

Core was generated by `python3.9: middlewared (zettarepl)'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 _sleepq_remove (sq=0x800aa42c0, td=0x8078af000) at /truenas-releng/freenas/_BE/os/lib/libthr/thread/thr_sleepq.c:153
153 SLIST_REMOVE_HEAD(&sq->sq_freeq, sq_flink);
[Current thread is 1 (LWP 102089)]

This is from an enterprise user system and they are routinely having zettarepl problems as well as core dumps so this is probably a good system to try and figure out what's going on.

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Bug Clerk January 10, 2022 at 10:00 PM

Vladimir Vinogradenko January 10, 2022 at 9:51 PM

Reassigning to OS team — seems to be a crash in python or OS libraries.

Bug Clerk January 10, 2022 at 9:25 PM

Vladimir Vinogradenko January 10, 2022 at 9:20 PM

it crashes somewhere deep inside python or FreeBSD, I am not in the power to debug that. It is also not reproducible locally.

Limiting the number of simultaneously running replication seems a good idea. I can't imagine a case where running 15 replications in parallel would benefit performance. If the network is bandwidth-limited for a single connection, 5 parallel connections are usually enough to utilize its full capacity. The current default is "infinity", I propose to set it to 5 and consider this resolved.

Also I found out we are missing the UI for this option. I created an issue for 22.MM https://jira.ixsystems.com/browse/NAS-114241 should I target it to 13.0?

Bill O'Hanlon December 7, 2021 at 5:18 PM

We asked the customer to run the following command, per Vlad:
midclt call replication.config.update '{"max_parallel_replication_tasks": 1}'
 

That has prevented the crashes, so it is an adequate workaround in the short term.

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Katalon Platform

Created October 4, 2021 at 7:41 PM
Updated July 1, 2022 at 5:42 PM
Resolved January 10, 2022 at 10:15 PM

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