ERROR => shmat(11698206,0x(nil),SHM_RND) (12: Cannot allocate memory)

[Former Member]

I am do a clean installation of NetWeaver 7.0 SR3. When it comes to the start instance phase, the WP could not be started. I have checked the dev_w0, there is an error says:

M  SHM_PRES_BUF

(addr: 7fb6acf8e000, size: 4400000)

I  *** ERROR => shmat(11698206,0x(nil),SHM_RND) (12: Cannot allocate memory) [shmux.c      1593]

M  *** ERROR => ThShMCreate: ShmCreate SHM_ROLL_AREA_KEY failed [thxxhead.c   2757]

M  *** ERROR => ThIPCInit: ThShMCreate [thxxhead.c   2172]

M  ***LOG R19=> ThInit, ThIPCInit ( TSKH-IPC-000001) [thxxhead.c   1567]

I have 4 GB RAM and 20GB swap space, so I think this is not due to memory bottle neck.

Can anyone help me on this? Thanks in advance!

Regards,

Roy Liu

[Former Member]

hi,

did you fix the issue at the end?

if so, how?

[isaias_freitas]

Hello,

Please set the parameter "rdisp/TRACE = 2" and start the system again.

Once the issue occurs, remove this parameter and attach to this thread:

1) The complete "DEFAULT.PFL" and "S01_DVEBMGS00_linux-7zr7" profiles;

2) The complete dev_w?? trace where you see the shared memory errors (similar to the entries posted at the opening of this thread).

Regards,

Isaías

PS: there is an option to attach files to the thread, so you do not need to copy/paste their entire content at the text box.

[Former Member]

hey Isaias,

this post is from 2013, so the problem is probaly not relevant right now.

[isaias_freitas]

Hello Adi,

I didn't see that the original post was from 2013...

I just saw the recent update .

Regards,

Isaías

[Former Member]

Hi all,

Thanks for all your answers.  I have though about OS level parameters, and tried to change shmmax and shmall  some times, but it did work. Currently, the two parameters are as follows:

cat /proc/sys/kernel/shmmax

18446744073709551615

cat /proc/sys/kernel/shmall

1152921504606846720

I have tried to restart the host a lot of times and also tried cleanipc, it seems not work

And the sappfpar  results are as follows:

================================================================================

==   Checking profile:     /usr/sap/S01/SYS/profile/S01_DVEBMGS00_linux-7zr7

================================================================================

***WARNING: Unexpected parameter: rslg/new_layout =9

***WARNING: Unexpected parameter: service/protectedwebmethods =SDEFAULT

***WARNING: Unexpected parameter: ssl/ssl_lib =/usr/sap/S01/DVEBMGS00/exe/libsapcrypto.so

Shared memory disposition overview

================================================================

Shared memory pools

Key:   10  Pool                        

            Size configured.....:   136000000 ( 129.7 MB)

            Size min. estimated.:   132565864 ( 126.4 MB)

            Advised Size........:   136000000 ( 129.7 MB)

Key:   40  Pool for database buffers   

            Size configured.....:   112000000 ( 106.8 MB)

            Size min. estimated.:   109175040 ( 104.1 MB)

            Advised Size........:   112000000 ( 106.8 MB)

Shared memories inside of pool 10

Key:       11  Size:      500000 (   0.5 MB) Factory calender buffer     

Key:       12  Size:     6000000 (   5.7 MB) TemSe Char-Code convert Buf.

Key:       13  Size:    60500000 (  57.7 MB) Alert Area                  

Key:       14  Size:     4400000 (   4.2 MB) Presentation buffer         

Key:       16  Size:       22400 (   0.0 MB) Semaphore activity monitoring

Key:       17  Size:    11142696 (  10.6 MB) Roll administration         

Shared memories inside of pool 40

Key:       42  Size:     7232992 (   6.9 MB) DB TTAB buffer              

Key:       43  Size:    32534392 (  31.0 MB) DB FTAB buffer              

Key:       44  Size:     7958392 (   7.6 MB) DB IREC buffer              

Key:       45  Size:     4886392 (   4.7 MB) DB short nametab buffer     

Key:       46  Size:       20480 (   0.0 MB) DB sync table               

Key:       47  Size:     3073024 (   2.9 MB) DB CUA buffer               

Key:       48  Size:      500000 (   0.5 MB) Number range buffer         

Key:       49  Size:     2968344 (   2.8 MB) Spool admin (SpoolWP+DiaWP) 

Shared memories outside of pools

Key:        1  Size:        2500 (   0.0 MB) System administration       

Key:        2  Size:     5944564 (   5.7 MB) Disp. administration tables 

Key:        3  Size:    66864000 (  63.8 MB) Disp. communication areas   

Key:        4  Size:      513448 (   0.5 MB) statistic area              

Key:        6  Size:   319488000 ( 304.7 MB) ABAP program buffer         

Key:        7  Size:       14838 (   0.0 MB) Update task administration  

Key:        8  Size:   268435556 ( 256.0 MB) Paging buffer               

Key:        9  Size:   268435556 ( 256.0 MB) Roll buffer                 

Key:       18  Size:     3670116 (   3.5 MB) Paging adminitration        

Key:       19  Size:    30000000 (  28.6 MB) Table-buffer                

Key:       30  Size:       20480 (   0.0 MB) Taskhandler runtime admin.  

Key:       31  Size:     9612000 (   9.2 MB) Dispatcher request queue    

Key:       33  Size:    10240000 (   9.8 MB) Table buffer, part.buffering

Key:       34  Size:    33554432 (  32.0 MB) Enqueue table               

Key:       41  Size:    25010000 (  23.9 MB) DB statistics buffer        

Key:       51  Size:    18000000 (  17.2 MB) Extended memory admin.      

Key:       52  Size:      180000 (   0.2 MB) Message Server buffer       

Key:       54  Size:     4202496 (   4.0 MB) Export/Import buffer        

Key:       55  Size:        8192 (   0.0 MB) Spool local printer+joblist 

Key:       57  Size:     1572864 (   1.5 MB) Profilparameter in shared mem

Key:       58  Size:        4096 (   0.0 MB) Enqueue ID for reset        

Key:       62  Size:    85983232 (  82.0 MB) Memory pipes                

Key:       63  Size:      409600 (   0.4 MB) ICMAN shared memory         

Key:       64  Size:     4202496 (   4.0 MB) Online Text Repository Buf. 

Key:       65  Size:     4202496 (   4.0 MB) Export/Import Shared Memory 

Key:       81  Size:       21760 (   0.0 MB) Security Audit Log          

Key:     1002  Size:      400000 (   0.4 MB) Performance monitoring V01.0

Key: 58900100  Size:        4096 (   0.0 MB) SCSA area                   

Nr of operating system shared memory segments: 30

Shared memory resource requirements estimated

================================================================

Total Nr of shared segments required.....:         30

System-imposed number of shared memories.:       1000

Shared memory segment size required min..:  319488000 ( 304.7 MB)

Currently available maximum segment size.: 5570035712 (5312.0 MB)

Swap space requirements estimated

================================================

Shared memory....................: 1343.7 MB

..in pool 10  126.4 MB,   97% used

..in pool 40  104.1 MB,   97% used

..not in pool: 1107.2 MB

Processes........................:  257.8 MB

Extended Memory .................: 4096.0 MB

------------------------------------------------

Total, minimum requirement.......: 5697.5 MB

Process local heaps, worst case..: 1907.3 MB

Total, worst case requirement....: 7604.8 MB

Errors detected..................:    0

Warnings detected................:    3

Thanks : )

Roy

[Former Member]

Hi,

So the issue is resolved.

Thanks for all your answers.  I have though about OS level parameters, and tried to change shmmax and shmall  some times, but it did work. Currently, the two parameters are as follows:

Thanks

Rishi Abrol

[Former Member]

My fault. That is a huge mistake....  I forgot type "NOT"   actually it did NOT work.....

the OS is SLES11 SP2

Roy

[jimguo]

Hi,

I suggest you try to set the parameters as below and see if it helps:

kernel.shmall = 8290304

kernel.shmmax = 3294967296

Thanks.

Jim

[AtulKumarJain]

Hi Roy,

Please stop the system clean the shared memory using ipc clean command , if possible reboot the host .

Then start the system , it should work , if still face issue please provide dev_w* dev_disp log.

Best Regards,

Atul

[Sriram2009]

Hi Roy

Just restart the system and then try again

Regards

Ram

[Former Member]

Hi,

can you please tell me the OS.

It looks that this issue is with the shared roll.

did you run below command and see if you get some error.

sappfpar check pf=<instance profile>

Can you please tell me the value of this parameter.

1. rdisp/ROLL_SHM

Thanks

Rishi Abrol

[jimguo]

Hi,

The error may be caused by OS level memory limit.

eg. kernel.shmall and kernel.shmmax in Linux.

Thanks.

Jim