Hello,
my CentOS 7 system goes unstable after few days of use, memory consumption growing and never getting freed, until the system slows down to hell (swapping), kills apps, and eventually freezes or reboots itself.
This only happens when I have two network interfaces turned on, one wired and one wireless, each to different routers.
The hardware: a Dell Precision 7530, SSD, 16GB RAM. HW memory and disk both tested OK by software. According to lspci: 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-LM (rev 10) 6e:00.0 Network controller: Intel Corporation Wireless-AC 9260 (rev 29)
The software: I keep this CentOS 7 system up-to-date with the CR repo, excepted the microcode_ctl package, stuck to few versions back (updating it kills the system and potentially causes fs damages). Kernels reproducing the issue (IOW, all): kernel-3.10.0-1062.18.1.el7.x86_64 kernel-3.10.0-1127.el7.x86_64 kernel-3.10.0-1127.8.2.el7.x86_64 kernel-3.10.0-1127.13.1.el7.x86_64
Nothing jumps to my eyes looking at /var/log/messages but this, many occurrences: kernel: nf_conntrack: falling back to vmalloc. I searched the Internet for it, and the few results I found were not bringing any solution and were quite pessimistic WRT to memory freeing, am I wrong?
Regards,