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[Freeipmi-users] ipmiconsole sending unsollicited break


From: Fabien Wernli
Subject: [Freeipmi-users] ipmiconsole sending unsollicited break
Date: Fri, 29 Mar 2013 11:04:34 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Hi,

We just encountered a serious problem when switching from ipmitool to
ipmiconsole: on at least two out of several hundred hosts, multiple
'SysRq' breaks were sent just after the sol session establishment, resulting
in one server reset, and one power off.
Here's some relevant snippets from one server:

--
server24:/var/log/messages
--------------------------
Mar 28 14:30:41 server24 kernel: SysRq : HELP : loglevel0-8 reBoot Crashdump 
tErm Full kIll thaw-filesystems(J) saK showMem Nice powerOff showPc unRaw Sync 
showTasks Unmount shoWcpus
Mar 28 14:36:03 server24 kernel: SysRq : HELP : loglevel0-8 reBoot 
CrashdumptErm Full kIll thaw-filesystems(J) saK showMem Nice powerOff showPc 
unRaw Sync showTasks Unmount shoWcpus
Mar 28 14:36:04 server24 kernel: SysRq : Changing Loglevel
Mar 28 14:36:04 server24 kernel: SysRq : HELP : loglevel0-8 reBoot Crashdump 
tErm Full kIll thaw-filesystems(J) saK showMem Nice powerOff showPc unRaw Sync 
showTasks Unmount shoWcpus
Mar 28 14:36:06 server24 kernel: SysRq : Power Off
Mar 28 14:36:06 server24 kernel: SysRq : HELP : loglevel0-8 reBoot Crashdump 
tErm Full kIll thaw-filesystems(J) saK showMem Nice powerOff showPc unRaw Sync 
showTasks Unmount shoWcpus

server24:[on the ipmiconsole]
-----------------------------
[-- Console down -- Thu Mar 28 14:30:25 2013]
[-- Console up -- Thu Mar 28 14:30:28 2013]
2013-03-28T14:30:29+01:00  [SOL established]
2013-03-28T14:30:29+01:00  ¥ 0O Qw¥ATIMÏ
[ ... lots of garbage ... ]
2013-03-28T14:30:36+01:00  Ìoçiî iîcorrect
2013-03-28T14:30:36+01:00
2013-03-28T14:30:36+01:00  Scientific Linux SL release 5.1 (Boron)
2013-03-28T14:30:36+01:00  Kernel 2.6.18-164.9.1.el5 on an x86_64
2013-03-28T14:30:36+01:00
2013-03-28T14:30:37+01:00  server24 login: ø¼ø>§2øDsaÃaÇ¢søJ0q2
[ ... lots of garbage until 14:36:06 (time of the SysRq : Power Off)... ]
2013-03-28T14:48:17+01:00  [SOL established]
2013-03-28T15:17:25+01:00  CP: C3 RN50 200m/200e DDR1 BIOS
--

The first two lines on the console show the switch from 'ipmitool
sol' to 'ipmiconsole'.
The last line is text from the POST/BIOS startup and evidence of the boot
process (someone switched the server back on using a finger).
Note there is no '[generate break]' message on the console, nor any evidence
of SysRq, although the kernel logged it.

Any insight would be greatly appreciated as to the how and why. Currently
we're considering disabling the dangerous SysRq keys in the kernels, at the
cost of useful functionality. The switch to freeipmi was motivated by a
memory leak in ipmitool sol.

Cheers




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