NethServer Version: NethServer release 7.9.2009 (final)
Kernel Release: 3.10.0-1160.36.2.el7.x86_64
Host: PROXMOX_VE (standalone)
Virtual NIC: VirtIO (paravirtualized)
my Nethserver crashed (since some days) with “nf_ct_deliver_cached_events” message in console.
I have activated “kernel.log” but there are no helpful messages about the crash.
First, i had checked the virtual harddisk (no problems) and then the corresponding real hardisk (SSD). The corresponding SSD was some years old and has shows some errors in SMART so i have moved the virtual Disks (with stopped vm) in Proxmox to a new Disk (SSD). I have restarted Proxmox also because there was an kernel update in the pipeline. But the Nethserver crashes come back (at different time intervals) and the used SSD shows no errors. There are some other vm (qt) and container (ct) on Proxmox on the same host-ssd without problems.
Then i have went back to the second-newest kernel (Nethserver) and reinstalled the newest kernel again. No change, the problem persist.
Next i would install “crash” to get a “full” crashdump but maybe the “nf_ct_deliver_cached_events” message in panic console (shown in Proxmox Console) is enough information.
Could it be a problem with “conntrack”? What could the cause for it? Network attacks or a DDOS is overfill a corresponding cache?