And just 10 minutes ago I had another crash.
This time I sat right next to the server, tried to shut it down on the local monitor but had no luck.
The log files again show a lot of these (see quote) what are those and what can I do about them?
Aug 30 22:12:12 OptimusPrime kernel: INFO: rcu_bh detected stalls on CPUs/tasks:
Aug 30 22:12:12 OptimusPrime kernel: 6-...: (1 GPs behind) idle=98a/140000000000000/0 softirq=3443318/3678502 fqs=59996
Aug 30 22:12:12 OptimusPrime kernel: (detected by 26, t=240007 jiffies, g=-243, c=-244, q=6)
Aug 30 22:12:12 OptimusPrime kernel: Sending NMI from CPU 26 to CPUs 6:
Aug 30 22:12:12 OptimusPrime kernel: NMI backtrace for cpu 6
Aug 30 22:12:12 OptimusPrime kernel: CPU: 6 PID: 16400 Comm: nc2 Tainted: G W 4.14.49-unRAID #1
Aug 30 22:12:12 OptimusPrime kernel: Hardware name: Supermicro X11DPi-N(T)/X11DPi-N, BIOS 2.0b 02/28/2018
Aug 30 22:12:12 OptimusPrime kernel: task: ffff880838bb0000 task.stack: ffffc90005d28000
Aug 30 22:12:12 OptimusPrime kernel: RIP: 0010:nf_nat_setup_info+0x198/0x5d1 [nf_nat]
Aug 30 22:12:12 OptimusPrime kernel: RSP: 0018:ffff88046ff83758 EFLAGS: 00000286
Aug 30 22:12:12 OptimusPrime kernel: RAX: ffff88044b8b9706 RBX: ffff880449f45b80 RCX: 00000000cb652c51
Aug 30 22:12:12 OptimusPrime kernel: RDX: ffff88044b880000 RSI: 00000000b603c035 RDI: 000000008b215da7
Aug 30 22:12:12 OptimusPrime kernel: RBP: ffff88046ff83828 R08: 0000000000000038 R09: ffff88040b75c700
Aug 30 22:12:12 OptimusPrime kernel: R10: 0000000000000348 R11: 0000000000000000 R12: ffff88044cca7960
Aug 30 22:12:12 OptimusPrime kernel: R13: ffff88046ff83838 R14: ffffffff81c88480 R15: 0000000000000000
Aug 30 22:12:12 OptimusPrime kernel: FS: 000014ca3e6aa700(0000) GS:ffff88046ff80000(0000) knlGS:0000000000000000
Aug 30 22:12:12 OptimusPrime kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 30 22:12:12 OptimusPrime kernel: CR2: 000014b6626ef000 CR3: 000000083dfb0004 CR4: 00000000007606e0
Aug 30 22:12:12 OptimusPrime kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 30 22:12:12 OptimusPrime kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Aug 30 22:12:12 OptimusPrime kernel: PKRU: 55555554