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I see following info in logs:

May 20 03:53:10 server kernel: [18372.886560] mce_notify_irq: 5 callbacks suppressed
May 20 03:53:10 server kernel: [18372.886561] mce: [Hardware Error]: Machine check events logged
May 20 03:53:10 server kernel: [18372.886922] mce: [Hardware Error]: Machine check events logged
May 20 03:53:10 server kernel: [18372.889559] CPU1: Core temperature/speed normal
May 20 03:53:10 server kernel: [18372.889561] CPU7: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889562] CPU5: Core temperature/speed normal
May 20 03:53:10 server kernel: [18372.889563] CPU3: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889567] CPU5: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889568] CPU1: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889572] CPU6: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889574] CPU2: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889580] CPU4: Package temperature/speed normal
May 20 03:53:10 server kernel: [18372.889583] CPU0: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.861401] mce_notify_irq: 3 callbacks suppressed
May 20 03:58:10 server kernel: [18672.861406] mce: [Hardware Error]: Machine check events logged
May 20 03:58:10 server kernel: [18672.864387] CPU5: Core temperature/speed normal
May 20 03:58:10 server kernel: [18672.864389] CPU7: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864391] CPU3: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864393] CPU2: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864395] CPU6: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864396] CPU5: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864399] mce: [Hardware Error]: Machine check events logged
May 20 03:58:10 server kernel: [18672.864410] CPU4: Package temperature/speed normal
May 20 03:58:10 server kernel: [18672.864411] CPU0: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.830964] mce_notify_irq: 1 callbacks suppressed
May 20 04:03:10 server kernel: [18972.830965] mce: [Hardware Error]: Machine check events logged
May 20 04:03:10 server kernel: [18972.833189] CPU1: Core temperature/speed normal
May 20 04:03:10 server kernel: [18972.835207] CPU5: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.835208] CPU2: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.835210] CPU4: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.835211] CPU6: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.835227] CPU7: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.835229] CPU3: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.838204] CPU1: Package temperature/speed normal
May 20 04:03:10 server kernel: [18972.838291] CPU0: Package temperature/speed normal
May 20 04:03:44 server kernel: [19006.638788] CPU7: Core temperature/speed normal
May 20 04:03:44 server kernel: [19006.638789] CPU3: Core temperature/speed normal
May 20 04:08:10 server kernel: [19272.810036] CPU1: Core temperature/speed normal
May 20 04:08:10 server kernel: [19272.818054] CPU5: Core temperature/speed normal
May 20 04:08:10 server kernel: [19272.818060] CPU5: Package temperature/speed normal
May 20 04:08:51 server kernel: [19313.756605] CPU2: Core temperature/speed normal
May 20 04:08:51 server kernel: [19313.756607] CPU6: Core temperature/speed normal

Nothing else that would indicate root cause of the error is logged. /var/log/mcelog is empty.

How can I diagnose what's behind this error?

Whatever it is, it's unlikely to be cause by temperature, because in addition to messages about CPU temp above not showing anything unusual, I'm monitoring temperature with a Python script parsing output of sensors that raises monitoring alert if any temperature gets above high level.

OS: Debian 9.9 (stretch)

System: HP ProLiant DL180 G6

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