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[Bug 1042933] kernel panic due to nmi caused by systemd-watchdog test
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Thu, 22 Jun 2017 12:45:51 +0000
  • Message-id: <bug-1042933-21960-lEi4TyhVD3@http.bugzilla.suse.com/>
http://bugzilla.suse.com/show_bug.cgi?id=1042933
http://bugzilla.suse.com/show_bug.cgi?id=1042933#c16

--- Comment #16 from Thomas Blume <thomas.blume@xxxxxxxx> ---
(In reply to Borislav Petkov from comment #15)

pr_err("%s: NMI raised\n", __func__);

//tblume: suppress NMI
return NMI_HANDLED;

so that we can see when it hits.

Ok, now I get this:

-->
teviot:~ # /systemd-testsuite/run/test-watchdog
Hardware watchdo[ 356.497530] hpwdt: tblume: reload variable is: 234
[ 356.497597] hpwdt: tblume: New timer passed in is 10 seconds
g 'HPE iLO2+ HW [ 356.499686] hpwdt: tblume: reload variable is: 78
Watchdog Timer',[ 356.499717] hpwdt: tblume: reload variable is: 78
version 0
Set [ 356.500778] hpwdt: tblume: reload variable is: 78
hardware watchdog to 10s.
Pinging...
[ 356.501780] hpwdt: tblume: reload variable is: 78
[ 357.745055] hpwdt: hpwdt_pretimeout: NMI raised
Pinging...
[ 361.502857] hpwdt: tblume: reload variable is: 78
Pinging...
Pinging...
[ 366.502937] hpwdt: tblume: reload variable is: 78
[ 371.504020] hpwdt: tblume: reload variable is: 78
[ 371.508413] systemd-journald[363]: Sent WATCHDOG=1 notification.
Pinging...
[ 376.505052] hpwdt: tblume: reload variable is: 78
--<

I also found that the NMI is only raised at the first test run after reboot.
Wen I repeat the test, there is no more NMI and the ping just succeeds - until
the next reboot.

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