[tipc-discussion] Gacks on, callbacks suppressed messages

[Duzan, G. D <Gar...@fi...>]

   When pushing TIPC a bit hard on some of our servers, I've recently had three of them issue clusters of "Gacks on" messages, with two of them also issuing "callbacks suppressed" messages. These had kernels from 5.10 to 6.2, so it doesn't seem like an issue with a particular kernel. Here is a sample dmesg fragment:

[Wed May 17 17:36:15 2023] __tipc_build_gap_ack_blks: 5 callbacks suppressed
[Wed May 17 17:36:15 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 291!
[Wed May 17 17:36:15 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 307!
[Wed May 17 17:36:15 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 227!
[Wed May 17 17:36:15 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 243!
[Wed May 17 17:36:15 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 259!
[Wed May 17 17:36:16 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 355!
[Wed May 17 17:36:16 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 259!
[Wed May 17 17:36:18 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 323!
[Wed May 17 17:36:18 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 515!
[Wed May 17 17:36:18 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 531!
[Wed May 17 17:36:21 2023] __tipc_build_gap_ack_blks: 121 callbacks suppressed
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 147!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 163!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 179!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 355!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 195!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 195!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 211!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4d75f5:eno1: 64, ql: 403!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 227!
[Wed May 17 17:36:21 2023] tipc: Gacks on 1866da4d3dd9:eth0-1866da4db43e:eno1: 64, ql: 243!

Does this point to a need for tuning, or some bug?

   Thanks.

Gary Duzan
IT Architect Senior
GT.M Core Team

T:  +1.484.302.3226
E:  gar...@fi...
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