Configure the Unix user process and file limits.Check and perform steps from the following section: If the system is running Oracle database check that '/etc/security/nf', '/etc/profile' and '/etc/pam.d/login' files are modified according to Oracle Installation Guide for the installed version of Oracle. Increase the value for the "nproc" parameter in /etc/security/nf. $ ps -no-headers auxwwwm | awk '$2 = "-" ' | sort | uniq -c | sort -n You can run the below command to find the number of processes opened for every user and compare if that limit is exceeded with what defined in /etc/security/nf or /etc/security/limits.d/*. In order to check the use of processes against what is allowed for the user, check the output of ulimit -u for the limit set to the particular user, and compare with the number of processes the user is runing. Note that in case of a memory leak the first application to segfault is not neccesarilly the one causing the memory leak. This would show up as applications segfaulting. Check with sar whether all memory was used or whether a large number of processes was spawned.Ī lack of system resources may cause some of the system daemons to die.A unique value less than kernel.pid_max must be available. There is not an available ID to assign to the new process.The system ran out of memory and new processes were unable to start because they could not allocate memory.The system was not able to create new processes, because of the limits set for nproc in /etc/security/nf.There is a misbehaving service or process running, consuming more resources than expected.There can be various reasons for processes not being able to fork: Note 353529.1: Requirements for Installing Oracle 9iR2 64-bit on RHEL 4 x86-64 (AMD64/EM64T).Note 339510.1: Requirements for Installing Oracle 10gR2 RDBMS on RHEL 4 on AMD64/EM64T.Such an article should be in Oracle Metalink, for example: Use Oracle Installation Guide for your version of Oracle for this and complete the section related to changes in /etc/security/nf and other files. Double check, if the modifications required was done on your system.
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Oracle Installation Guide usually requires some modifications in /etc/security/nf, /etc/profile and other files related to the numbers of processes. There could be an Oracle database running on the server. Setting nproc in /etc/security/nf has no effect in Red Hat Enterprise Linux 6 In RHEL6, also check /etc/security/limits.d/nf. Kernel.pid_max must be larger than the total number of simultaneous threads and processes.
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Nov 24 12:59:14 localhost multipathd: fork failed: Resource temporarily unavailable Similar fork failed: Resource temporarily unavailable error are logged by other processes also: Nov 24 12:59:14 localhost multipathd: fork failed: Resource temporarily unavailable
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The following errors are observed in /var/log/messages: Nov 24 19:08:51 localhost sshd: error: fork: Resource temporarily unavailable Nov 24 19:14:46 localhost sshd2: Disconnecting: fork failed: Resource temporarily unavailable Nov 24 19:06:04 localhost sshd2: Disconnecting: fork failed: Resource temporarily unavailable The following errors are seen in /var/log/secure: Nov 24 19:01:45 localhost sshd2: fatal: setresuid 20054: Resource temporarily unavailable