In an environment running Galera Cluster with 6 MariaDB nodes, 1 arbitrator node, some replicas and a ProxySQL, after a network issue that triggered a state transfer on two nodes,
for some reason, almost all the transactions hang in:
- “starting” state on the commit statement or on "".
- "acquiring total order isolation" on the "KILL CONNECTION" statement (The "KILL CONNECTION" was requested by the ProxySQL)
We tried to restart the service but it hangs on stopping, ProxySQL detected this node as down and switched the traffic to another node.
By looking at the backtrace it seems that we have a kind of "pthread_cond_wait() deadlock" executed by lock.wait() on the enter() function on the commit monitor during the commit order critical section.
Unfortunately, we didn't find a way to reproduce the problem
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MDEV-30963 Assertion failure !lock.was_chosen_as_deadlock_victim in trx0trx.h:1065
I see that it has been previously claimed that this bug does not affect MariaDB Server 10.6 or later. Please clarify what should be done on merge to 10.6. If it is anything else than a null-merge (discarding the changes), we need to review and test the 10.6 version as well.
Am I right that this is basically yet another attempt at fixing
MDEV-23328?