Just had this happen to me again on 6.11.5 and got the following log:
Apr 1 01:02:51 neptune kernel: ------------[ cut here ]------------
Apr 1 01:02:51 neptune kernel: WARNING: CPU: 0 PID: 926 at net/netfilter/nf_conntrack_core.c:1208 __nf_conntrack_confirm+0xa5/0x2cb [nf_conntrack]
Apr 1 01:02:51 neptune kernel: Modules linked in: xt_mark xt_nat xt_CHECKSUM ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle vhost_net tun vhost vhost_iotlb tap macvlan xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter xfs md_mod efivarfs ip6table_filter ip6_tables iptable_filter ip_tables x_tables bridge stp llc bonding tls igb x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul crc32c_intel mgag200 ipmi_ssif drm_shmem_helper ghash_clmulni_intel aesni_intel drm_kms_helper crypto_simd cryptd drm rapl nvme intel_cstate intel_uncore backlight syscopyarea i2c_algo_bit acpi_ipmi sysfillrect sysimgblt i2c_core fb_sys_fops ahci nvme_core intel_pch_thermal wmi ipmi_si libahci acpi_tad acpi_power_meter button unix [last unloaded: igb]
Apr 1 01:02:51 neptune kernel: CPU: 0 PID: 926 Comm: kworker/0:1 Not tainted 5.19.17-Unraid #2
Apr 1 01:02:51 neptune kernel: Hardware name: HPE ProLiant MicroServer Gen10 Plus/ProLiant MicroServer Gen10 Plus, BIOS U48 07/14/2022
Apr 1 01:02:51 neptune kernel: Workqueue: events macvlan_process_broadcast [macvlan]
Apr 1 01:02:51 neptune kernel: RIP: 0010:__nf_conntrack_confirm+0xa5/0x2cb [nf_conntrack]
Apr 1 01:02:51 neptune kernel: Code: c6 48 89 44 24 10 e8 dd e2 ff ff 8b 7c 24 04 89 da 89 c6 89 04 24 e8 56 e6 ff ff 84 c0 75 a2 48 8b 85 80 00 00 00 a8 08 74 18 <0f> 0b 8b 34 24 8b 7c 24 04 e8 16 de ff ff e8 2c e3 ff ff e9 7e 01
Apr 1 01:02:51 neptune kernel: RSP: 0018:ffffc90000003cf0 EFLAGS: 00010202
Apr 1 01:02:51 neptune kernel: RAX: 0000000000000188 RBX: 0000000000000000 RCX: ab746607d338df42
Apr 1 01:02:51 neptune kernel: RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffa02fcccc
Apr 1 01:02:51 neptune kernel: RBP: ffff8881e9620900 R08: 9f6e9c8d27a2e914 R09: d373ae0a6dc13241
Apr 1 01:02:51 neptune kernel: R10: 9920e9b9d70536e0 R11: 0600604e2c14e251 R12: ffffffff82909480
Apr 1 01:02:51 neptune kernel: R13: 0000000000036d3d R14: ffff8881e9e71400 R15: 0000000000000000
Apr 1 01:02:51 neptune kernel: FS: 0000000000000000(0000) GS:ffff88885ec00000(0000) knlGS:0000000000000000
Apr 1 01:02:51 neptune kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Apr 1 01:02:51 neptune kernel: CR2: 00001464ee5d8000 CR3: 000000000420a003 CR4: 00000000003706f0
Apr 1 01:02:51 neptune kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Apr 1 01:02:51 neptune kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Apr 1 01:02:51 neptune kernel: Call Trace:
Apr 1 01:02:51 neptune kernel: <IRQ>
Apr 1 01:02:51 neptune kernel: nf_conntrack_confirm+0x25/0x54 [nf_conntrack]
Apr 1 01:02:51 neptune kernel: nf_hook_slow+0x3a/0x96
Apr 1 01:02:51 neptune kernel: ? ip_protocol_deliver_rcu+0x164/0x164
Apr 1 01:02:51 neptune kernel: NF_HOOK.constprop.0+0x79/0xd9
Apr 1 01:02:51 neptune kernel: ? ip_protocol_deliver_rcu+0x164/0x164
Apr 1 01:02:51 neptune kernel: ip_sabotage_in+0x47/0x58 [br_netfilter]
Apr 1 01:02:51 neptune kernel: nf_hook_slow+0x3a/0x96
Apr 1 01:02:51 neptune kernel: ? ip_rcv_finish_core.constprop.0+0x3b7/0x3b7
Apr 1 01:02:51 neptune kernel: NF_HOOK.constprop.0+0x79/0xd9
Apr 1 01:02:51 neptune kernel: ? ip_rcv_finish_core.constprop.0+0x3b7/0x3b7
Apr 1 01:02:51 neptune kernel: __netif_receive_skb_one_core+0x77/0x9c
Apr 1 01:02:51 neptune kernel: process_backlog+0x8c/0x116
Apr 1 01:02:51 neptune kernel: __napi_poll.constprop.0+0x28/0x124
Apr 1 01:02:51 neptune kernel: net_rx_action+0x159/0x24f
Apr 1 01:02:51 neptune kernel: __do_softirq+0x126/0x288
Apr 1 01:02:51 neptune kernel: do_softirq+0x7f/0xab
Apr 1 01:02:51 neptune kernel: </IRQ>
Apr 1 01:02:51 neptune kernel: <TASK>
Apr 1 01:02:51 neptune kernel: __local_bh_enable_ip+0x4c/0x6b
Apr 1 01:02:51 neptune kernel: netif_rx+0x52/0x5a
Apr 1 01:02:51 neptune kernel: macvlan_broadcast+0x10a/0x150 [macvlan]
Apr 1 01:02:51 neptune kernel: macvlan_process_broadcast+0xbc/0x12f [macvlan]
Apr 1 01:02:51 neptune kernel: process_one_work+0x1a8/0x295
Apr 1 01:02:51 neptune kernel: worker_thread+0x18b/0x244
Apr 1 01:02:51 neptune kernel: ? rescuer_thread+0x281/0x281
Apr 1 01:02:51 neptune kernel: kthread+0xe4/0xef
Apr 1 01:02:51 neptune kernel: ? kthread_complete_and_exit+0x1b/0x1b
Apr 1 01:02:51 neptune kernel: ret_from_fork+0x1f/0x30
Apr 1 01:02:51 neptune kernel: </TASK>
Apr 1 01:02:51 neptune kernel: ---[ end trace 0000000000000000 ]---
Apr 1 05:00:15 neptune crond[1103]: exit status 1 from user root /usr/local/sbin/mover &> /dev/null
Apr 2 01:53:58 neptune webGUI: Successful login user root from 10.0.0.88
Apr 2 01:54:01 neptune sSMTP[24591]: Creating SSL connection to host
Apr 2 01:54:01 neptune sSMTP[24591]: SSL connection using ECDHE-RSA-AES256-GCM-SHA384
Apr 2 01:54:03 neptune sSMTP[24591]: Sent mail for
[email protected] (221 Bye) uid=0 username=root outbytes=821
Apr 2 01:54:39 neptune flash_backup: adding task: /usr/local/emhttp/plugins/dynamix.my.servers/scripts/UpdateFlashBackup update
Apr 2 01:55:01 neptune sSMTP[26871]: Creating SSL connection to host
Apr 2 01:55:02 neptune sSMTP[26871]: SSL connection using ECDHE-RSA-AES256-GCM-SHA384
Apr 2 01:55:03 neptune sSMTP[26871]: Sent mail for
[email protected] (221 Bye) uid=0 username=root outbytes=848
Apr 2 04:40:01 neptune apcupsd[1629]: apcupsd exiting, signal 15
Apr 2 04:40:01 neptune apcupsd[1629]: apcupsd shutdown succeeded
Apr 2 04:40:03 neptune apcupsd[17815]: apcupsd 3.14.14 (31 May 2016) slackware startup succeeded
Apr 2 04:40:03 neptune apcupsd[17815]: NIS server startup succeeded
Apr 2 05:00:09 neptune crond[1103]: exit status 1 from user root /usr/local/sbin/mover &> /dev/null
Apr 3 04:00:07 neptune avahi-daemon[2511]: Registering new address record for fe80::90bc:40ff:fe4f:443d on shim-br0.*.
Apr 3 04:00:12 neptune kernel: igb 0000:02:00.0 eth0: igb: eth0 NIC Link is Down
Apr 3 04:00:12 neptune kernel: bond0: (slave eth0): link status definitely down, disabling slave
Apr 3 04:00:12 neptune kernel: device eth0 left promiscuous mode
Apr 3 04:00:12 neptune kernel: bond0: now running without any active interface!
Apr 3 04:00:12 neptune kernel: br0: port 1(bond0) entered disabled state
Apr 3 04:00:15 neptune ntpd[1082]: Deleting interface #1 br0, 10.0.1.1#123, interface stats: received=1215, sent=1215, dropped=0, active_time=238051 secs
Apr 3 04:00:15 neptune ntpd[1082]: 143.215.130.72 local addr 10.0.1.1 -> <null>
Apr 3 04:00:15 neptune ntpd[1082]: 80.241.0.72 local addr 10.0.1.1 -> <null>
Apr 3 04:00:15 neptune ntpd[1082]: 142.202.190.19 local addr 10.0.1.1 -> <null>
Apr 3 04:00:15 neptune ntpd[1082]: 69.164.213.136 local addr 10.0.1.1 -> <null>
Apr 3 04:01:27 neptune kernel: igb 0000:02:00.0 eth0: igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
Apr 3 04:01:27 neptune kernel: bond0: (slave eth0): link status definitely up, 1000 Mbps full duplex
Apr 3 04:01:27 neptune kernel: bond0: (slave eth0): making interface the new active one
Apr 3 04:01:27 neptune kernel: device eth0 entered promiscuous mode
Apr 3 04:01:27 neptune kernel: bond0: active interface up!
Apr 3 04:01:27 neptune kernel: br0: port 1(bond0) entered blocking state
Apr 3 04:01:27 neptune kernel: br0: port 1(bond0) entered forwarding state
Apr 3 04:01:29 neptune ntpd[1082]: Listen normally on 3 br0 10.0.1.1:123
Apr 3 04:01:29 neptune ntpd[1082]: new interface(s) found: waking up resolver
Apr 3 04:01:30 neptune avahi-daemon[2511]: Withdrawing address record for fe80::90bc:40ff:fe4f:443d on shim-br0.
Apr 3 04:01:30 neptune avahi-daemon[2511]: Registering new address record for fe80::90bc:40ff:fe4f:443d on shim-br0.*.
Apr 3 04:02:06 neptune avahi-daemon[2511]: Withdrawing address record for fe80::90bc:40ff:fe4f:443d on shim-br0.
Apr 3 05:00:09 neptune crond[1103]: exit status 1 from user root /usr/local/sbin/mover &> /dev/null
Apr 4 02:52:06 neptune kernel: BUG: Bad rss-counter state mm:000000005de9be02 type:MM_SHMEMPAGES val:1
Apr 4 05:00:16 neptune crond[1103]: exit status 1 from user root /usr/local/sbin/mover &> /dev/null
Apr 4 08:31:50 neptune emhttpd: Starting services...
If I had to guess from reading this, it looks like the mover crashed and took down the rest of the server with it.
My ping check shows it stopped responding around 4:40am and I restarted the server around 8:00am.