System crash due to semaphore 5

[Former Member]

Hi friends,

System crash due to semaphore 5 customer is facing this issue past so many months

can any one help on this.

[Reagan]

Hello

What is the release and patch level of the kernel ?

Check these SAP notes

981088 - System crash due to semaphore 5 deadlock

1754001 - DP: Work processes block on semaphore 5

1875389 - Deadlock on semaphore 5

The error happens at workprocess/dispatcher communication which is most likely a buggy kernel.

Update the kernel and see whether it fixes.

Regards

RB

[Former Member]

Hi,

(I) Since this phenomenon is always the result of a work process termination, all necessary precautions should be taken to prevent a process from terminating. For example, you can set the parameter rdisp/softcancel_sequence to 5,-1 (refer also to the parameter documentation in transaction RZ11) to ensure that a work process whose current action is to be canceled is not terminated by a signal.
However, this problem is solved with kernel patch 79 (Release 7.00); as a result, if you use a kernel with a higher patch level, you no longer have to set this parameter.

(II) Set the profile parameter
rdisp/cpic_snc_delete to 1
in the affected instance profiles.

(III) Apply a current kernel patch (you must apply at least the kernel patch mentioned in Note 1409275).

Generally, if this problem occurs, you must upgrade to a current kernel patch and set the parameter rdisp/cpic_snc_delete to 1.

Note:981088

BR,

Prabhakar

[Former Member]

Hi,

As an initial start please check the below note.

1875389 - Deadlock on semaphore 5

Please provide more details like when does this issue happens. What is the kernel release.

Can you please past the dev_w0,dev_icm logs .

Thanks

Rishi Abrol