@olivierlambert Thanks ! Will try it as soon as I'm off vacation in early september.

@olivierlambert Is it because some packets size from wireguard are too high ? Should I lower the MTU of the wireguard servers & clients to be lower than the MTU of the host interface ?

@olivierlambert will my complete crash dump directory would help you ?

Another thing that's annoying me is that the VMs on the host don't start even with the autostart option checked.

@olivierlambert Here's the NIb brand/model : Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5720 Gigabit Ethernet PCIe

Yes we use wireguard but the MTU is not specified so it should be 1500 :

@olivierlambert Yes I have 3 pfSense on this host. They use the Realtek NIC Type

Hi,

I've refurbished an old serveur with SSDs and a fresh install of xcpng 8.2.1 and I experience crashes (several per week) of this serveur :

[ 100454.995054]  ALERT: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 100454.995073]   INFO: PGD 0 P4D 0 
[ 100454.995080]   WARN: Oops: 0000 [#1] SMP NOPTI
[ 100454.995087]   WARN: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           O      4.19.0+1 #1
[ 100454.995095]   WARN: Hardware name: Dell Inc. PowerEdge R440/04JN2K, BIOS 2.4.8 11/27/2019
[ 100454.995111]   WARN: RIP: e030:skb_copy_ubufs+0x19c/0x5f0
[ 100454.995118]   WARN: Code: 90 cc 00 00 00 48 03 90 d0 00 00 00 48 63 44 24 40 48 83 c0 03 48 c1 e0 04 48 01 d0 48 89 18 c7 40 08 00 00 00 00 44 89 78 0c <48> 8b 43 08 a8 01 0f 85 3f 04 00 00 48 8b 44 24 30 48 83 78 20 ff
[ 100454.995136]   WARN: RSP: e02b:ffff888289a037f8 EFLAGS: 00010282
[ 100454.995143]   WARN: RAX: ffff88824f63c8e0 RBX: 0000000000000000 RCX: 00000000000000c0
[ 100454.995152]   WARN: RDX: ffff88824f63c8c0 RSI: ffff88824f63c8c0 RDI: ffffea000a55e400
[ 100454.995160]   WARN: RBP: 0000000000000000 R08: ffff88824f63c800 R09: ffff88826a08c468
[ 100454.995168]   WARN: R10: ffff888289a039b0 R11: 0000000000000000 R12: ffff88824e65ea00
[ 100454.995176]   WARN: R13: 0000000000000000 R14: ffff888285975580 R15: 0000000000000000
[ 100454.995195]   WARN: FS:  0000000000000000(0000) GS:ffff888289a00000(0000) knlGS:0000000000000000
[ 100454.995204]   WARN: CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 100454.995211]   WARN: CR2: 0000000000000008 CR3: 00000002689c0000 CR4: 0000000000040660
[ 100454.995225]   WARN: Call Trace:
[ 100454.995231]   WARN:  <IRQ>
[ 100454.995238]   WARN:  skb_clone+0x71/0xa0
[ 100454.995249]   WARN:  do_execute_actions+0x4ec/0x1750 [openvswitch]
[ 100454.995258]   WARN:  ? do_execute_actions+0x157f/0x1750 [openvswitch]
[ 100454.995288]   WARN:  ? __wake_up_common+0x8c/0x120
[ 100454.995297]   WARN:  ? _raw_spin_unlock_irqrestore+0x14/0x20
[ 100454.995304]   WARN:  ? __wake_up_common_lock+0x87/0xc0
[ 100454.995314]   WARN:  ovs_execute_actions+0x47/0x120 [openvswitch]
[ 100454.995322]   WARN:  ovs_dp_process_packet+0x7d/0x110 [openvswitch]
[ 100454.995332]   WARN:  ? key_extract+0xa53/0xd60 [openvswitch]
[ 100454.995341]   WARN:  ovs_vport_receive+0x6e/0xd0 [openvswitch]
[ 100454.995351]   WARN:  ? hrtimer_init+0x190/0x190
[ 100454.995357]   WARN:  ? __alloc_skb+0x4e/0x270
[ 100454.995362]   WARN:  ? __alloc_skb+0x76/0x270
[ 100454.995371]   WARN:  ? arch_local_irq_restore+0x5/0x10
[ 100454.995377]   WARN:  ? __alloc_skb+0x4e/0x270
[ 100454.995384]   WARN:  ? __kmalloc_track_caller+0x58/0x200
[ 100454.995391]   WARN:  ? __slab_alloc.constprop.81+0x42/0x4e
[ 100454.995401]   WARN:  ? __kmalloc_reserve.isra.48+0x29/0x70
[ 100454.995410]   WARN:  netdev_frame_hook+0x105/0x180 [openvswitch]
[ 100454.995419]   WARN:  __netif_receive_skb_core+0x211/0xb30
[ 100454.995427]   WARN:  __netif_receive_skb_one_core+0x36/0x70
[ 100454.995434]   WARN:  netif_receive_skb_internal+0x34/0xe0
[ 100454.995443]   WARN:  xenvif_tx_action+0x4b8/0x900
[ 100454.995450]   WARN:  xenvif_poll+0x27/0x70
[ 100454.995457]   WARN:  net_rx_action+0x2a5/0x3e0
[ 100454.995463]   WARN:  __do_softirq+0xd1/0x28c
[ 100454.995471]   WARN:  irq_exit+0xa8/0xc0
[ 100454.995478]   WARN:  xen_evtchn_do_upcall+0x2c/0x50
[ 100454.995493]   WARN:  xen_do_hypervisor_callback+0x29/0x40
[ 100454.995505]   WARN:  </IRQ>
[ 100454.995513]   WARN: RIP: e030:xen_hypercall_sched_op+0xa/0x20
[ 100454.995520]   WARN: Code: 51 41 53 b8 1c 00 00 00 0f 05 41 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 1d 00 00 00 0f 05 <41> 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
[ 100454.995538]   WARN: RSP: e02b:ffffffff82003e58 EFLAGS: 00000246
[ 100454.995544]   WARN: RAX: 0000000000000000 RBX: ffffffff82011740 RCX: ffffffff810013aa
[ 100454.995553]   WARN: RDX: ffffffff8203d250 RSI: 0000000000000000 RDI: 0000000000000001
[ 100454.995561]   WARN: RBP: 0000000000000000 R08: 00000000f46027f0 R09: 0000000000000000
[ 100454.995569]   WARN: R10: 0000000000007ff0 R11: 0000000000000246 R12: 0000000000000000
[ 100454.995577]   WARN: R13: 0000000000000000 R14: ffffffff82011740 R15: ffffffff82011740
[ 100454.995587]   WARN:  ? xen_hypercall_sched_op+0xa/0x20
[ 100454.995596]   WARN:  ? xen_safe_halt+0xc/0x20
[ 100454.995602]   WARN:  ? default_idle+0x1a/0x140
[ 100454.995608]   WARN:  ? do_idle+0x1ea/0x260
[ 100454.995614]   WARN:  ? cpu_startup_entry+0x6f/0x80
[ 100454.995624]   WARN:  ? start_kernel+0x558/0x578
[ 100454.995630]   WARN:  ? set_init_arg+0x55/0x55
[ 100454.995637]   WARN:  ? xen_start_kernel+0x599/0x5a3
[ 100454.995644]   WARN: Modules linked in: arptable_filter arp_tables tcp_diag udp_diag inet_diag netlink_diag ebtable_filter ebtables tun arc4 md4 sha512_ssse3 sha512_generic cmac nls_utf8 cifs ccm fscache bnx2fc(O) cnic(O) uio fcoe libfcoe libfc scsi_transport_fc openvswitch nsh nf_nat_ipv6 nf_nat_ipv4 nf_conncount nf_nat 8021q garp mrp stp llc ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_multiport dm_multipath xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter sunrpc skx_edac nls_iso8859_1 intel_powerclamp crct10dif_pclmul nls_cp437 crc32_pclmul vfat ghash_clmulni_intel fat pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper dm_mod dcdbas sg lpc_ich i2c_i801 ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter ip_tables x_tables sd_mod ahci libahci xhci_pci megaraid_sas(O)
[ 100454.995749]   WARN:  tg3 libata xhci_hcd scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua scsi_mod efivarfs ipv6 crc_ccitt
[ 100454.995767]   WARN: CR2: 0000000000000008
[ 100454.995778]   WARN: ---[ end trace 6a2f342fbc40a914 ]---
[ 100455.000224]   WARN: RIP: e030:skb_copy_ubufs+0x19c/0x5f0
[ 100455.000234]   WARN: Code: 90 cc 00 00 00 48 03 90 d0 00 00 00 48 63 44 24 40 48 83 c0 03 48 c1 e0 04 48 01 d0 48 89 18 c7 40 08 00 00 00 00 44 89 78 0c <48> 8b 43 08 a8 01 0f 85 3f 04 00 00 48 8b 44 24 30 48 83 78 20 ff
[ 100455.000255]   WARN: RSP: e02b:ffff888289a037f8 EFLAGS: 00010282
[ 100455.000268]   WARN: RAX: ffff88824f63c8e0 RBX: 0000000000000000 RCX: 00000000000000c0
[ 100455.000280]   WARN: RDX: ffff88824f63c8c0 RSI: ffff88824f63c8c0 RDI: ffffea000a55e400
[ 100455.000288]   WARN: RBP: 0000000000000000 R08: ffff88824f63c800 R09: ffff88826a08c468
[ 100455.000297]   WARN: R10: ffff888289a039b0 R11: 0000000000000000 R12: ffff88824e65ea00
[ 100455.000306]   WARN: R13: 0000000000000000 R14: ffff888285975580 R15: 0000000000000000
[ 100455.000323]   WARN: FS:  0000000000000000(0000) GS:ffff888289a00000(0000) knlGS:0000000000000000
[ 100455.000335]   WARN: CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 100455.000348]   WARN: CR2: 0000000000000008 CR3: 00000002689c0000 CR4: 0000000000040660
[ 100455.000369]  EMERG: Kernel panic - not syncing: Fatal exception in interrupt

He was previously on xcpng 8.0 and wasn't crashing.
Only the mecanical hard drives have been replaced with SSDs on the hardware side.

Any idea on what's causing the kernel panic ?

Thanks.