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IDProjectCategoryView StatusLast Update
0018336CentOS-7kernelpublic2021-10-25 18:28
Reporternaman.jain Assigned To 
Status newResolutionopen 
PlatformProductionOScentos OS Versioncentos 7.6.1810
Product Version7.6.1810 
Summary0018336: Kmalloc-32 consuming servers whole memory
DescriptionHi Team,

I am using the centos 7.6.1810 version with the kernel as 3.10.0-957.el7.x86_64. And this centos version I am facing the issue of the kmalloc-32 which is consuming my whole server RAM. Due to which we are unable to perform other actions on the server which causes my Production application to down.

I tried by running:
sync; echo 2 > /proc/sys/vm/drop_caches

But that doesn't help me out.
I am not able to understand what is causing the kmalloc-32 to consume the server's whole memory.
I the attached screenshot of slabtop we can see the kmalloc-32 is having 100% usage.
I search on this I lot but didn't get much on this just to reboot the server. After Rebooting the server the kmalloc-32 memory usage also decreases and my server starts running fine but in the next month, I again face the same issue so I again reboot the server.
Is there any proper solution to remove this problem completely instead of restarting my server again and again?

Note: I am running the Kubernetes application on this machine.
Tags#Centos7, 3.10.0-957.21.3.el7, hyper-v, kernel, kernel bug




2021-10-25 13:13


kmalloc-32.png (26,598 bytes)   
kmalloc-32.png (26,598 bytes)   


2021-10-25 13:21

manager   ~0038676

> I am using the centos 7.6.1810 version with the kernel as 3.10.0-957.el7.x86_64

ONLY the CURRENT version is supported so you need to update to 7.9.2009 with the latest kernel kernel-3.10.0-1160.45.1.el7.x86_64

All older versions of CentOS 7 (i.e. 7.8 and earlier are explicitly unsupported.


2021-10-25 18:28

reporter   ~0038677

Thanks for the quick response.

Issue History

Date Modified Username Field Change
2021-10-25 13:13 naman.jain New Issue
2021-10-25 13:13 naman.jain Tag Attached: #Centos7
2021-10-25 13:13 naman.jain Tag Attached: 3.10.0-957.21.3.el7
2021-10-25 13:13 naman.jain Tag Attached: hyper-v
2021-10-25 13:13 naman.jain Tag Attached: kernel
2021-10-25 13:13 naman.jain Tag Attached: kernel bug
2021-10-25 13:13 naman.jain File Added: kmalloc-32.png
2021-10-25 13:21 TrevorH Note Added: 0038676
2021-10-25 18:28 naman.jain Note Added: 0038677