linux-kernel - rasdaemon broke between v6.0 and v6.3?

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Message-ID: <ZLhzWoyRCWN0FmqE@agluck-desk3>
Date:   Wed, 19 Jul 2023 16:35:54 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     rostedt@...dmis.org, Aristeu Rozanski <aris@...vo.org>,
        linux-kernel@...r.kernel.org
Subject: rasdaemon broke between v6.0 and v6.3?

[resend as plain text - sorry for the earlier HTML]

An internal team is seeing tests that worked on v6.0 fail on v6.3. The problem is that
rasdaemon isn’t waking up to process the “mce_record” trace events.

Manually checking for them works:

root@...251:/sys/kernel/debug/tracing>systemctl stop rasdaemon
root@...251:/sys/kernel/debug/tracing>
root@...251:/sys/kernel/debug/tracing>
root@...251:/sys/kernel/debug/tracing>echo 1 > events/mce/mce_record/enable
root@...251:/sys/kernel/debug/tracing>
root@...251:/sys/kernel/debug/tracing>cat trace_pipe
           <...>-235     [000] .....   596.892583: mce_record: CPU: 0, MCGc/s: f000c15/0, MC13: 8c00004200800090, IPID: 0000000000000000, ADDR/MISC/SYND: 0000000123450000/08000a80c2982086/0000000000000000, RIP: 00:<0000000000000000>, TSC: 14120b051a1, PROCESSOR: 0:c06f1, TIME: 1689802780, SOCKET: 0, APIC: 0
     kworker/0:2-235     [000] .....   597.204343: mce_record: CPU: 0, MCGc/s: f000c15/0, MC255: 9c0000000000009f, IPID: 0000000000000000, ADDR/MISC/SYND: 0000000123450000/000000000000008c/0000000000000000, RIP: 00:<0000000000000000>, TSC: 0, PROCESSOR: 0:c06f1, TIME: 1689802781, SOCKET: 0, APIC: 0

So their tests are injecting errors, and the trace event is firing.

Is there some updated version of rasdaemon needed?

Some kernel CONFIG option problem?

-Tony