Linux SYSRQ help message shows up when enabling SoL function

Troubleshooting

Problem

While using Serial over LAN (SoL) on System x3550 M4, user may get Linux system SYSRQ help menu printed out. For example: [SoL Session operational. Use approximately? for help] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)

Resolving The Problem

Source

RETAIN tip: H205212

Symptom

While using Serial over LAN (SoL) on System x3550 M4, user may get Linux system SYSRQ help menu printed out.

For example:

	[SoL Session operational. Use approximately? for help] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)

Affected configurations

The system may be any of the following IBM servers:

System x3550 M4, type 7914, any model
iDataPlex dx360 M4 server, type 7912, any model

This tip is not software specific.

This tip is not option specific.

The following system firmware level(s) are affected:

IMM v1.00 (build ID 26K)

The system has the symptom described above.

Solution

This behavior has been corrected in Integrated Management Module (IMM) firmware.

The file is available by selecting the appropriate Product group, System, Product name, Product machine type, and operating system on IBM Support's Fix Central web page, at the following URL:

http://www.ibm.com/support/fixcentral

Additional information

This message can safely be ignored.

Users may get a harmless SYSRQ menu printout in the SoL console. They cannot operate any items in that menu by pressing the keys in the message. The SoL console is still functional.

Document Location

Worldwide

Operating System

System x:Operating system independent / None

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Tips

Linux SYSRQ help message shows up when enabling SoL function - IBM System x