We found following error logs in /var/log/message
logfile.
Aug 5 14:30:10 snort kernel: vmap allocation for
size 9146368 failed: use vmalloc=<size> to increase size.
Aug 5 14:30:10 snort kernel: vmap allocation for
size 9146368 failed: use vmalloc=<size> to increase size.
Aug 5 14:30:10 snort kernel: vmap allocation for
size 9146368 failed: use vmalloc=<size> to increase size.
Aug 5 14:30:10 snort kernel: vmap allocation for
size 9146368 failed: use vmalloc=<size> to increase size.
Aug 5 14:30:10 snort kernel: vmap allocation for
size 9146368 failed: use vmalloc=<size> to increase size.
When we
checked vmalloc limit was set to 124 MB. Due to low kernel allocated memory, error was coming.
[root@snort
~]# cat /proc/meminfo | grep -i vmalloc
VmallocTotal: 124144 kB
VmallocUsed: 5536 kB
VmallocChunk: 1156
kB
Solution:
Add vmalloc=256M
in /boot/grub/grub.conf file to increase the limit of vmalloc kernel parameter.
[root@snort
~]# cat /boot/grub/grub.conf
# grub.conf
generated by anaconda
#
# Note that
you do not have to rerun grub after making changes to this file
#
NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative
to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro
root=/dev/mapper/vg_snort-lv_root
# initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS
(2.6.32-358.14.1.el6.i686)
root (hd0,0)
kernel
/vmlinuz-2.6.32-358.14.1.el6.i686 ro root=/dev/mapper/vg_snort-lv_root
rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_snort/lv_root rd_NO_MD
SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc
KEYTABLE=us rd_LVM_LV=vg_snort/lv_swap rd_NO_DM rhgb quiet crashkernel=auto vmalloc=256M
initrd
/initramfs-2.6.32-358.14.1.el6.i686.img
title CentOS
(2.6.32-279.el6.i686)
root (hd0,0)
# vmalloc=256MB
kernel /vmlinuz-2.6.32-279.el6.i686 ro
root=/dev/mapper/vg_snort-lv_root rd_NO_LUKS LANG=en_US.UTF-8
rd_LVM_LV=vg_snort/lv_root rd_NO_MD SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us
rd_LVM_LV=vg_snort/lv_swap rd_NO_DM rhgb quiet vmalloc=256M
initrd
/initramfs-2.6.32-279.el6.i686.img
Reboot the
system and vmalloc size is increased upto 256MB.
[root@snort
~]# cat /proc/meminfo | grep -i vmall
VmallocTotal: 262144 kB
VmallocUsed: 115536 kB
VmallocChunk: 41156 kB
