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Not always, but almost. Also there are two different cases of DCB_STATE_POLLING log entries, only those with "14, Bad address" error message are directly related to crashes, while those showing "104, Connection reset by peer" are showing more often, and not directly related to crashes. On the first maxscale nodes log I see nine crashes, seven of which are directly following "DCB_STATE_POLLING Bad Address", one seems unrelated, and one has a ten second delay between Bad Address and crash:
#1
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{"log":"2020-09-18 01:24:54 error : (974076) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-18T01:24:54.364117221Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 6. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-18T01:24:54.364191351Z"}
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#2
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{"log":"2020-09-18 01:26:09 error : (1390) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-18T01:26:09.119713151Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-18T01:26:09.12025142Z"}
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#3 - crash without DCB_STATE_POLLING failed: 14, Bad address
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-18T01:26:50.980079721Z"}
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#4
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{"log":"2020-09-19 01:37:20 error : (3428495) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:37:20.954614354Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:37:20.954344435Z"}
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#5
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{"log":"2020-09-19 01:37:57 error : (1778) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:37:57.428786922Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:37:57.428817716Z"}
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#6
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{"log":"2020-09-19 01:39:45 error : (751) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:39:45.523828761Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:39:45.531472865Z"}
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#7
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{"log":"2020-09-19 01:41:07 error : (3615) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:41:07.100807197Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:41:07.222915366Z"}
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#8 10 seconds between message and crash
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{"log":"2020-09-19 01:41:49 error : (280) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:41:49.439615283Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:41:59.230705607Z"}
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#9
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{"log":"2020-09-19 01:43:11 error : (2460) Write to Client DCB 10.10.130.24 in state DCB_STATE_POLLING failed: 14, Bad address\n","stream":"stdout","time":"2020-09-19T01:43:11.953636015Z"}
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{"log":"Fatal: MaxScale 2.4.12 received fatal signal 11. Commit ID: 7756d7c25708811b7a52b72156de752d6ac91a35 System name: Linux Release string: Ubuntu 18.04.5 LTS\n","stream":"stderr","time":"2020-09-19T01:43:11.953653404Z"}
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