Crash on 6.17.0-8-generic #30
Description
last few lines of OpenVPN client:
2026-01-16 15:42:01 OPTIONS IMPORT: route options modified
2026-01-16 15:42:01 OPTIONS IMPORT: route-related options modified
2026-01-16 15:42:01 OPTIONS IMPORT: tun-mtu set to 1400
2026-01-16 15:42:01 net_route_v4_best_gw query: dst 0.0.0.0
2026-01-16 15:42:01 net_route_v4_best_gw result: via 192.168.188.1 dev enp1s0
2026-01-16 15:42:01 net_route_v4_best_gw query: dst 0.0.0.0
2026-01-16 15:42:01 net_route_v4_best_gw result: via 192.168.188.1 dev enp1s0
2026-01-16 15:42:01 net_iface_new: add tun0 type ovpn
2026-01-16 15:42:01 DCO device tun0 opened
2026-01-16 15:42:01 ovpn-dco device [tun0] opened
2026-01-16 15:42:01 NOTE: unable to redirect IPv4 default gateway -- VPN gateway parameter (--route-gateway or --ifconfig) is missing
2026-01-16 15:42:01 Initialization Sequence Completed
2026-01-16 15:42:01 Data Channel: cipher 'AES-256-GCM', peer-id: 0
2026-01-16 15:42:01 Timers: ping 12, ping-restart 50
2026-01-16 15:42:01 Protocol options: protocol-flags cc-exit tls-ekm dyn-tls-crypt
2026-01-16 15:42:51 [server] Inactivity timeout (--ping-restart), restarting
2026-01-16 15:42:51 Closing ovpn-dco interface
2026-01-16 15:42:51 net_iface_del: delete tun0
log from /var/log/kern.log:
2026-01-16T15:30:43.732749+00:00 nemesis kernel: tun0: deleting peer with id 0, reason 2
2026-01-16T15:42:52.545106+00:00 nemesis kernel: message repeated 14 times: [ tun0: deleting peer with id 0, reason 2]
2026-01-16T15:42:52.545131+00:00 nemesis kernel: BUG: kernel NULL pointer dereference, address: 0000000000000020
2026-01-16T15:42:52.545188+00:00 nemesis kernel: #PF: supervisor write access in kernel mode
2026-01-16T15:42:52.545189+00:00 nemesis kernel: #PF: error_code(0x0002) - not-present page
2026-01-16T15:42:52.545192+00:00 nemesis kernel: PGD 0 P4D 0
2026-01-16T15:42:52.545192+00:00 nemesis kernel: Oops: Oops: 0002 [#1] SMP NOPTI
2026-01-16T15:42:52.545192+00:00 nemesis kernel: CPU: 0 UID: 0 PID: 8708 Comm: kworker/0:0 Not tainted 6.17.0-8-generic #8-Ubuntu PREEMPT(voluntary)
2026-01-16T15:42:52.545208+00:00 nemesis kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2025.02-8ubuntu3 10/08/2025
2026-01-16T15:42:52.545211+00:00 nemesis kernel: Workqueue: events ovpn_peer_keepalive_work [ovpn]
2026-01-16T15:42:52.545212+00:00 nemesis kernel: RIP: 0010:ovpn_tcp_socket_detach+0x66/0x90 [ovpn]
2026-01-16T15:42:52.545212+00:00 nemesis kernel: Code: 48 8b 83 b8 01 00 00 49 89 84 24 c0 02 00 00 48 8b 83 c0 01 00 00 49 89 44 24 28 49 8b 84 24 20 01 00 00 48 8b 93 c8 01 00 00 <48> 89 50 20 49 c7 84 24 98 02 00 00 00 00 00 00 5b 41 5c 5d 31 c0
2026-01-16T15:42:52.545213+00:00 nemesis kernel: RSP: 0018:ffffd0d30541fd78 EFLAGS: 00010246
2026-01-16T15:42:52.545213+00:00 nemesis kernel: RAX: 0000000000000000 RBX: ffff8ebb12c5a400 RCX: 0000000000000000
2026-01-16T15:42:52.545213+00:00 nemesis kernel: RDX: ffffffffbc19a700 RSI: 0000000000000000 RDI: 0000000000000000
2026-01-16T15:42:52.545219+00:00 nemesis kernel: RBP: ffffd0d30541fd88 R08: 0000000000000000 R09: 0000000000000000
2026-01-16T15:42:52.545222+00:00 nemesis kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff8ebbe2d2d200
2026-01-16T15:42:52.545222+00:00 nemesis kernel: R13: 00000000696a5c7b R14: 0000000000000000 R15: ffff8ebb01412000
2026-01-16T15:42:52.545222+00:00 nemesis kernel: FS: 0000000000000000(0000) GS:ffff8ebeb1c7f000(0000) knlGS:0000000000000000
2026-01-16T15:42:52.545223+00:00 nemesis kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-01-16T15:42:52.545223+00:00 nemesis kernel: CR2: 0000000000000020 CR3: 0000000105f1f000 CR4: 0000000000750ef0
2026-01-16T15:42:52.545223+00:00 nemesis kernel: PKRU: 55555554
2026-01-16T15:42:52.545224+00:00 nemesis kernel: Call Trace:
2026-01-16T15:42:52.545225+00:00 nemesis kernel: <TASK>
2026-01-16T15:42:52.545225+00:00 nemesis kernel: ovpn_socket_release+0x173/0x1a0 [ovpn]
2026-01-16T15:42:52.545230+00:00 nemesis kernel: unlock_ovpn+0x48/0x90 [ovpn]
2026-01-16T15:42:52.545233+00:00 nemesis kernel: ovpn_peer_keepalive_work+0xfe/0x1f0 [ovpn]
2026-01-16T15:42:52.545234+00:00 nemesis kernel: process_one_work+0x18b/0x370
2026-01-16T15:42:52.545234+00:00 nemesis kernel: worker_thread+0x317/0x450
2026-01-16T15:42:52.545234+00:00 nemesis kernel: ? __pfx_worker_thread+0x10/0x10
2026-01-16T15:42:52.545235+00:00 nemesis kernel: kthread+0x108/0x220
2026-01-16T15:42:52.545235+00:00 nemesis kernel: ? _raw_spin_unlock_irq+0xe/0x60
2026-01-16T15:42:52.545235+00:00 nemesis kernel: ? __pfx_kthread+0x10/0x10
2026-01-16T15:42:52.545236+00:00 nemesis kernel: ret_from_fork+0x131/0x150
2026-01-16T15:42:52.545236+00:00 nemesis kernel: ? __pfx_kthread+0x10/0x10
2026-01-16T15:42:52.545236+00:00 nemesis kernel: ret_from_fork_asm+0x1a/0x30
2026-01-16T15:42:52.545237+00:00 nemesis kernel: </TASK>
2026-01-16T15:42:52.545237+00:00 nemesis kernel: Modules linked in: ib_core bluetooth mptcp_diag vsock_diag tcp_diag udp_diag raw_diag inet_diag unix_diag tls ovpn ip6_udp_tunnel udp_tunnel qrtr cfg80211 binfmt_misc nls_iso8859_1 intel_rapl_msr intel_rapl_common snd_hda_codec_generic kvm_amd ccp snd_hda_intel snd_hda_codec kvm snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi irqbypass snd_hwdep snd_pcm i2c_i801 snd_timer i2c_smbus snd lpc_ich soundcore i2c_mux joydev input_leds mac_hid sch_fq_codel msr efi_pstore dm_multipath nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock vmw_vmci dmi_sysfs qemu_fw_cfg ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear polyval_clmulni ghash_clmulni_intel psmouse ahci serio_raw virtio_rng libahci virtio_gpu virtio_dma_buf hid_generic usbhid hid aesni_intel
2026-01-16T15:42:52.545238+00:00 nemesis kernel: CR2: 0000000000000020
2026-01-16T15:42:52.545238+00:00 nemesis kernel: ---[ end trace 0000000000000000 ]---
2026-01-16T15:42:52.545239+00:00 nemesis kernel: RIP: 0010:ovpn_tcp_socket_detach+0x66/0x90 [ovpn]
2026-01-16T15:42:52.545244+00:00 nemesis kernel: Code: 48 8b 83 b8 01 00 00 49 89 84 24 c0 02 00 00 48 8b 83 c0 01 00 00 49 89 44 24 28 49 8b 84 24 20 01 00 00 48 8b 93 c8 01 00 00 <48> 89 50 20 49 c7 84 24 98 02 00 00 00 00 00 00 5b 41 5c 5d 31 c0
2026-01-16T15:42:52.545247+00:00 nemesis kernel: RSP: 0018:ffffd0d30541fd78 EFLAGS: 00010246
2026-01-16T15:42:52.545247+00:00 nemesis kernel: RAX: 0000000000000000 RBX: ffff8ebb12c5a400 RCX: 0000000000000000
2026-01-16T15:42:52.545247+00:00 nemesis kernel: RDX: ffffffffbc19a700 RSI: 0000000000000000 RDI: 0000000000000000
2026-01-16T15:42:52.545248+00:00 nemesis kernel: RBP: ffffd0d30541fd88 R08: 0000000000000000 R09: 0000000000000000
2026-01-16T15:42:52.545248+00:00 nemesis kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff8ebbe2d2d200
2026-01-16T15:42:52.545253+00:00 nemesis kernel: R13: 00000000696a5c7b R14: 0000000000000000 R15: ffff8ebb01412000
2026-01-16T15:42:52.545256+00:00 nemesis kernel: FS: 0000000000000000(0000) GS:ffff8ebeb1c7f000(0000) knlGS:0000000000000000
2026-01-16T15:42:52.545256+00:00 nemesis kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-01-16T15:42:52.545257+00:00 nemesis kernel: CR2: 0000000000000020 CR3: 0000000295a40000 CR4: 0000000000750ef0
2026-01-16T15:42:52.545257+00:00 nemesis kernel: PKRU: 55555554
2026-01-16T15:42:52.545257+00:00 nemesis kernel: note: kworker/0:0[8708] exited with irqs disabled