error message about fork

[Suriya Wanna_1]

Hi everyone

I found the error message in syslog.log about fork , main focus message is list below.

Dec 21 09:49:58 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 09:59:39 cdgmrd2 su: - 3 firsthop-root
Dec 21 10:00:15 cdgmrd2 su: + 3 firsthop-root
Dec 21 10:00:06 cdgmrd2 su: - 3 firsthop-root
Dec 21 10:01:15 cdgmrd2 above message repeats 2 times
Dec 21 10:04:26 cdgmrd2 sshd[9246]: fatal: fork of unprivileged child failed
Dec 21 10:04:34 cdgmrd2 sshd[9248]: fatal: fork of unprivileged child failed
Dec 21 10:04:38 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:04:38 cdgmrd2 sshd[9252]: fatal: fork of unprivileged child failed
Dec 21 10:04:38 cdgmrd2 sshd[9255]: fatal: fork of unprivileged child failed
Dec 21 10:04:38 cdgmrd2 sshd[9257]: fatal: fork of unprivileged child failed
Dec 21 10:04:38 cdgmrd2 sshd[9259]: fatal: fork of unprivileged child failed
Dec 21 10:04:43 cdgmrd2 sshd[9261]: fatal: fork of unprivileged child failed
Dec 21 10:10:20 cdgmrd2 su: + 4 firsthop-root
Dec 21 10:13:08 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:19:57 cdgmrd2 sshd[9474]: fatal: fork of unprivileged child failed
Dec 21 10:13:59 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:21:25 cdgmrd2 sshd[9494]: error: openpty: Not enough space
Dec 21 10:21:25 cdgmrd2 sshd[9496]: error: session_pty_req: session 0 alloc failed
Dec 21 10:21:25 cdgmrd2 sshd[9496]: Disconnecting: fork failed: Not enough space
Dec 21 10:21:43 cdgmrd2 sshd[9501]: error: openpty: Not enough space
Dec 21 10:21:43 cdgmrd2 sshd[9503]: error: session_pty_req: session 0 alloc failed
Dec 21 10:21:43 cdgmrd2 sshd[9503]: Disconnecting: fork failed: Not enough space
Dec 21 10:22:28 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:22:46 cdgmrd2 su: - 1 firsthop-root
Dec 21 10:23:46 cdgmrd2 sshd[9525]: load_modules: can not open module /usr/lib/security/libpam_unix.1
Dec 21 10:24:10 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:24:00 cdgmrd2 sshd[9525]: load_modules: can not open module /usr/lib/security/libpam_unix.1
Dec 21 10:34:37 cdgmrd2 sshd[903]: error: fork: Not enough space
Dec 21 10:38:55 cdgmrd2 su: + 1 firsthop-root
Dec 21 10:36:31 cdgmrd2 sshd[903]: error: fork: Not enough space
Dec 21 10:39:37 cdgmrd2 sshd[9649]: fatal: fork of unprivileged child failed
Dec 21 10:36:55 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:41:16 cdgmrd2 above message repeats 2 times
Dec 21 10:47:58 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:50:51 cdgmrd2 sshd[9741]: error: openpty: Not enough space
Dec 21 10:50:31 cdgmrd2 prngd[2699]: Could not fork: Not enough space
Dec 21 10:50:51 cdgmrd2 sshd[9743]: error: session_pty_req: session 0 alloc failed
Dec 21 10:50:51 cdgmrd2 sshd[9743]: Disconnecting: fork failed: Not enough space
Dec 21 10:50:51 cdgmrd2 sshd[9743]: clnt_dg_create: out of memory
Dec 21 10:51:02 cdgmrd2 sshd[9748]: error: openpty: Not enough space
Dec 21 10:51:02 cdgmrd2 sshd[9750]: error: session_pty_req: session 0 alloc failed
Dec 21 10:51:02 cdgmrd2 sshd[9750]: Disconnecting: fork failed: Not enough space
Dec 21 10:51:02 cdgmrd2 sshd[9750]: clnt_dg_create: out of memory
Dec 21 10:51:21 cdgmrd2 sshd[9753]: error: openpty: Not enough space
Dec 21 10:51:21 cdgmrd2 sshd[9755]: error: session_pty_req: session 0 alloc failed
Dec 21 10:51:21 cdgmrd2 sshd[9755]: Disconnecting: fork failed: Not enough space
Dec 21 10:51:21 cdgmrd2 sshd[9755]: clnt_dg_create: out of memory
Dec 21 10:55:03 cdgmrd2 vmunix:
Dec 21 10:55:03 cdgmrd2 vmunix: Shutting down machine, please wait.

During this message happen i can not run any command ,when i type command it has message "fork failed: Not enough space" everytime.I have to reboot machine and after that it work fine but i want to know the cause of this problem.Does anyone have suggestion about this problem?

[Steven E. Protter]

Shalom Suryia,

You are out of memory.

swapinfo -tam

If allocated swap is all used up, get more memory.

If swap is very small, consider increasing it.

Check following kernel parameters:

nproc
nfile
maxuprc

SEP

[Arunvijai_4]

Can you try to get # swapinfo -tam as soon as you start getting these messages ? May be your memory is full?

-Arun

[Bill Hassell]

As mentioned, you are completely out of RAM *and* swap space. You need to double or triple the amount of swap space which can be done online with swapon. If you are also experiencing very slow performance, you also need to double or triple your RAM size.

[James R. Ferguson]

Hi:

Do a 'swapinfo -tam'. If you do not see a line marked "memory" in the first column, then you do not have pseudo-swap enabled. If not, change the kernel parameter 'swapmem_on' to one (1). This will cause 75% of you phyical memory to be counted for swap reservation purposes. You may find that your "can't fork (errno 12) errors vanish.

Regards!

...JRF...

[Kent Ostby]

Keep in mind that the general recommendation on hp-ux is for disk swap to equal 2x RAM.

Compare your swapinfo for disk swap to your RAM and adjust as needed.

[HGN]

Hi

I agree with others you need to increase your swap space

do a swapinfo -mat and see the swap & priotiy.

Rgds

HGN