Hi Antonio, I'm using the latest commit 4b104be to test and encountered following issue. I saw multi times in both peers. I never encountered this issue before commit c56b9d0. Can you reproduce?
[ 708.790419] ovpn_dco: module verification failed: signature and/or required key missing - tainting kernel [ 708.790885] OpenVPN data channel offload (ovpn-dco) 4b104be-dirty -- (C) 2020 OpenVPN, Inc. [ 899.304454] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 899.305245] #PF: supervisor read access in kernel mode [ 899.306044] #PF: error_code(0x0000) - not-present page [ 899.306825] PGD 0 P4D 0 [ 899.307597] Oops: 0000 [#1] SMP PTI [ 899.308335] CPU: 1 PID: 34 Comm: kworker/1:1 Tainted: G OE 5.4.0-54-generic #60-Ubuntu [ 899.309922] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 899.310887] Workqueue: ovpn-crypto-wq-tun0 ovpn_decrypt_work [ovpn_dco] [ 899.311762] RIP: 0010:gcmaes_crypt_by_sg.constprop.0+0x244/0x6c0 [aesni_intel] [ 899.312518] Code: ac f8 48 83 f8 01 19 c0 f7 d0 83 e0 b6 eb 87 4c 8b 74 24 40 48 8d 7c 24 60 49 8b 76 40 41 8b 56 30 e8 10 eb ac f8 49 8b 76 48 <44> 8b 60 08 49 89 c5 49 39 76 40 0f 84 7d 02 00 00 41 8b 56 30 48 [ 899.315985] RSP: 0018:ffff9ed680127800 EFLAGS: 00010246 [ 899.316843] RAX: 0000000000000000 RBX: 0000000000000030 RCX: ffffe78440adf700 [ 899.317489] RDX: 0000000000000008 RSI: ffff9ed680127bb0 RDI: ffff9ed680127bb0 [ 899.318143] RBP: ffff9ed680127aa0 R08: ffff9ed680127ab0 R09: ffff8c8f7c9b1460 [ 899.318777] R10: ffff9ed680127b88 R11: 0000000000000b6a R12: 0000000000000008 [ 899.319581] R13: 0000000000000040 R14: ffff8c8f6ba4c590 R15: ffff8c8f6b7dcb6a [ 899.320263] FS: 0000000000000000(0000) GS:ffff8c8f7eb00000(0000) knlGS:0000000000000000 [ 899.320841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 899.321486] CR2: 0000000000000008 CR3: 000000002d606003 CR4: 00000000000606e0 [ 899.322060] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 899.322685] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 899.323232] Call Trace: [ 899.323780] ? check_preempt_wakeup+0xfd/0x210 [ 899.324320] ? check_preempt_curr+0x7a/0x90 [ 899.324853] ? ttwu_do_wakeup+0x1e/0x150 [ 899.325360] ? ttwu_do_activate+0x5b/0x70 [ 899.325825] ? try_to_wake_up+0x224/0x6a0 [ 899.326303] ? alloc_pages_current+0x87/0xe0 [ 899.326760] ? __update_load_avg_cfs_rq+0x212/0x2f0 [ 899.327216] ? __update_load_avg_cfs_rq+0x212/0x2f0 [ 899.327664] ? sched_clock_cpu+0x11/0xb0 [ 899.328113] ? update_blocked_averages+0x11c/0x590 [ 899.328560] ? update_group_capacity+0x2c/0x1d0 [ 899.329007] generic_gcmaes_decrypt+0x5b/0x80 [aesni_intel] [ 899.329466] crypto_aead_decrypt+0x46/0x80 [ 899.329905] simd_aead_decrypt+0xa8/0xc0 [crypto_simd] [ 899.330456] crypto_aead_decrypt+0x46/0x80 [ 899.330884] ovpn_aead_decrypt+0x268/0x3d0 [ovpn_dco] [ 899.331314] ? __update_load_avg_cfs_rq+0x212/0x2f0 [ 899.331734] ? sched_clock_cpu+0x11/0xb0 [ 899.332218] ? x2apic_send_IPI+0x4a/0x50 [ 899.332743] ? native_send_call_func_single_ipi+0x1e/0x20 [ 899.333122] ? generic_exec_single+0x6e/0xd0 [ 899.333523] ? poke_int3_handler+0x80/0x80 [ 899.333880] ? smp_call_function_single+0xd1/0x110 [ 899.334326] ? poke_int3_handler+0x80/0x80 [ 899.334696] ? flush_tlb_mm_range+0xa1/0xe0 [ 899.335042] ? udp4_lib_lookup2+0x133/0x2d0 [ 899.335366] ? cpumask_next_and+0x1e/0x20 [ 899.335685] ? smp_call_function_many+0x23b/0x270 [ 899.336165] ? do_sync_core+0x1d/0x20 [ 899.336494] ? text_poke_bp_batch+0x106/0x160 [ 899.336886] ? arch_jump_label_transform_apply+0x3e/0x50 [ 899.337209] ? __jump_label_update+0x115/0x120 [ 899.337505] ovpn_decrypt_work+0x1c1/0x600 [ovpn_dco] [ 899.337803] process_one_work+0x1eb/0x3b0 [ 899.338113] worker_thread+0x4d/0x400 [ 899.338405] kthread+0x104/0x140 [ 899.338687] ? process_one_work+0x3b0/0x3b0 [ 899.338970] ? kthread_park+0x90/0x90 [ 899.339255] ret_from_fork+0x35/0x40 [ 899.339538] Modules linked in: ovpn_dco(OE) ip6_udp_tunnel udp_tunnel dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua intel_rapl_msr intel_rapl_common rapl input_leds serio_raw joydev snd_intel8x0 snd_ac97 _codec ac97_bus snd_pcm snd_timer vboxguest(O) snd soundcore mac_hid sch_fq_codel ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid 6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel vboxvideo drm_vram_helper ttm aesni_intel crypto_simd cryptd glue_helper drm_kms_helper syscop yarea sysfillrect sysimgblt fb_sys_fops psmouse ahci libahci i2c_piix4 drm pata_acpi e1000 video [ 899.342316] CR2: 0000000000000008 [ 899.342686] ---[ end trace dd4dab57d5473bc0 ]--- [ 899.343082] RIP: 0010:gcmaes_crypt_by_sg.constprop.0+0x244/0x6c0 [aesni_intel] [ 899.343451] Code: ac f8 48 83 f8 01 19 c0 f7 d0 83 e0 b6 eb 87 4c 8b 74 24 40 48 8d 7c 24 60 49 8b 76 40 41 8b 56 30 e8 10 eb ac f8 49 8b 76 48 <44> 8b 60 08 49 89 c5 49 39 76 40 0f 84 7d 02 00 00 41 8b 56 30 48 [ 899.344605] RSP: 0018:ffff9ed680127800 EFLAGS: 00010246 [ 899.344989] RAX: 0000000000000000 RBX: 0000000000000030 RCX: ffffe78440adf700 [ 899.345381] RDX: 0000000000000008 RSI: ffff9ed680127bb0 RDI: ffff9ed680127bb0 [ 899.345772] RBP: ffff9ed680127aa0 R08: ffff9ed680127ab0 R09: ffff8c8f7c9b1460 [ 899.346213] R10: ffff9ed680127b88 R11: 0000000000000b6a R12: 0000000000000008 [ 899.346624] R13: 0000000000000040 R14: ffff8c8f6ba4c590 R15: ffff8c8f6b7dcb6a [ 899.347153] FS: 0000000000000000(0000) GS:ffff8c8f7eb00000(0000) knlGS:0000000000000000 [ 899.347550] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 899.347948] CR2: 0000000000000008 CR3: 000000002d606003 CR4: 00000000000606e0 [ 899.348382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 899.348798] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Tony
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