- Red Hat Enterprise Linux 4, 5, 6, 7 and 8
Getting the error below while trying to su or to login as a local user.
su: cannot set user id:Resource temporarily unavailable
This error is also observed when logging in as a user on the console and using the SSH.
/etc/security/limits.confand all files in
/etc/security/limits.d/for the current setting of the
- Extend the
nprocvalue. This can be done in
/etc/security/limits.confor in any file in a file in
<username> - nproc <limit number> e.g. testuser - nproc 10240
In Red Hat Enterprise Linux 6, there's a default setting in
/etc/security/limits.d/90-nproc.conf. Change the default limit for all users or add a new limit for the affected user.
# Default limit for number of user's processes to prevent # accidental fork bombs. # See rhbz #432903 for reasoning. * soft nproc 1024 testuser soft nproc 10240 <== add
- The user fails to log in because an
EAGAINerror occurs if the user's number of executing threads has reached the
nprocresource limit. Note: Despite the name, this is a limit on threads, not processes.
- This error may occur if user's
nproclimit is set to
- In Red Hat Enterprise Linux 6, this error occurs even if the limit is not explicitly set because the default configuration for all users is set in
/etc/security/limits.conffor the user.
Log in as this user and run
$ ulimit -u 120831
# cat /proc/sys/kernel/threads-max 241663
Look at the number of user processes(threads)
# ps -u testuser -L | wc -l 103
su: pam_keyinit(su-l:session): Unable to change UID to 24074 temporarily su: pam_keyinit(su-l:session): Unable to change UID to 24074 temporarily
strace -ttTvfo /tmp/su.strace su - testuser:
23318 10:35:59.758440 setgid(24075) = 0 <0.000005> 23318 10:35:59.758471 setuid(24074) = -1 EAGAIN (Resource temporarily unavailable) <0.000018>
- Red Hat Enterprise Linux
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