[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.524724][ T26] audit: type=1800 audit(1572743221.589:25): pid=8877 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 66.570999][ T26] audit: type=1800 audit(1572743221.589:26): pid=8877 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 66.612415][ T26] audit: type=1800 audit(1572743221.599:27): pid=8877 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 77.406984][ T9030] kasan: CONFIG_KASAN_INLINE enabled [ 77.413044][ T9030] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 77.421134][ T9030] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 77.428066][ T9030] CPU: 1 PID: 9030 Comm: syz-executor619 Not tainted 5.4.0-rc3+ #0 [ 77.435944][ T9030] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.446013][ T9030] RIP: 0010:j1939_priv_get_by_ndev_locked+0xf5/0x190 [ 77.452682][ T9030] Code: 03 80 3c 02 00 0f 85 ae 00 00 00 48 8b 9b 88 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 60 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 7f 4c 8b a3 28 60 00 00 4d 85 e4 74 12 e8 04 9b f3 [ 77.472380][ T9030] RSP: 0018:ffff88808bcf78c0 EFLAGS: 00010206 [ 77.478447][ T9030] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff867f81d7 [ 77.486416][ T9030] RDX: 0000000000000c05 RSI: ffffffff867f81e4 RDI: 0000000000006028 [ 77.494383][ T9030] RBP: ffff88808bcf78d8 R08: ffff88809ce5a140 R09: ffffed101179ef0b [ 77.502349][ T9030] R10: ffffed101179ef0a R11: 0000000000000003 R12: 0000000000000000 [ 77.510314][ T9030] R13: 0000000000000118 R14: dffffc0000000000 R15: 0000000000000000 [ 77.518285][ T9030] FS: 0000000001f32880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 77.527211][ T9030] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.533789][ T9030] CR2: 00007fe641fe8000 CR3: 0000000008e6d000 CR4: 00000000001406e0 [ 77.541755][ T9030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.549718][ T9030] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.557686][ T9030] Call Trace: [ 77.560976][ T9030] j1939_netdev_notify+0x47/0x120 [ 77.565999][ T9030] notifier_call_chain+0xc2/0x230 [ 77.571031][ T9030] raw_notifier_call_chain+0x2e/0x40 [ 77.576318][ T9030] call_netdevice_notifiers_info+0xba/0x130 [ 77.582210][ T9030] ? tun_show_group+0x180/0x180 [ 77.587064][ T9030] rollback_registered_many+0x850/0x10d0 [ 77.592735][ T9030] ? generic_xdp_install+0x4a0/0x4a0 [ 77.598017][ T9030] ? mark_held_locks+0xa4/0xf0 [ 77.602778][ T9030] ? queue_delayed_work_on+0xf3/0x210 [ 77.608135][ T9030] ? lockdep_hardirqs_on+0x421/0x5e0 [ 77.613395][ T9030] rollback_registered+0x109/0x1d0 [ 77.618567][ T9030] ? rollback_registered_many+0x10d0/0x10d0 [ 77.624435][ T9030] unregister_netdevice_queue+0x1ee/0x2c0 [ 77.630129][ T9030] __tun_detach+0xd8a/0x1040 [ 77.634704][ T9030] tun_chr_close+0xe0/0x180 [ 77.639180][ T9030] __fput+0x2ff/0x890 [ 77.643135][ T9030] ? __tun_detach+0x1040/0x1040 [ 77.647963][ T9030] ____fput+0x16/0x20 [ 77.651919][ T9030] task_work_run+0x145/0x1c0 [ 77.656484][ T9030] do_exit+0x904/0x2e60 [ 77.660614][ T9030] ? debug_smp_processor_id+0x3c/0x214 [ 77.666060][ T9030] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 77.672185][ T9030] ? mm_update_next_owner+0x640/0x640 [ 77.677536][ T9030] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 77.683490][ T9030] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 77.689704][ T9030] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 77.695151][ T9030] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 77.700585][ T9030] do_group_exit+0x135/0x360 [ 77.705149][ T9030] __x64_sys_exit_group+0x44/0x50 [ 77.710144][ T9030] do_syscall_64+0xfa/0x760 [ 77.714621][ T9030] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.720496][ T9030] RIP: 0033:0x43ee08 [ 77.724381][ T9030] Code: Bad RIP value. [ 77.728418][ T9030] RSP: 002b:00007fffe465a698 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 77.736800][ T9030] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee08 [ 77.744745][ T9030] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 77.752691][ T9030] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 77.760638][ T9030] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 77.768583][ T9030] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 77.776529][ T9030] Modules linked in: [ 77.780751][ T9030] ---[ end trace 8e9a68575cb95a1a ]--- [ 77.786241][ T9030] RIP: 0010:j1939_priv_get_by_ndev_locked+0xf5/0x190 [ 77.792917][ T9030] Code: 03 80 3c 02 00 0f 85 ae 00 00 00 48 8b 9b 88 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 60 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 7f 4c 8b a3 28 60 00 00 4d 85 e4 74 12 e8 04 9b f3 [ 77.812529][ T9030] RSP: 0018:ffff88808bcf78c0 EFLAGS: 00010206 [ 77.818571][ T9030] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff867f81d7 [ 77.826543][ T9030] RDX: 0000000000000c05 RSI: ffffffff867f81e4 RDI: 0000000000006028 [ 77.834513][ T9030] RBP: ffff88808bcf78d8 R08: ffff88809ce5a140 R09: ffffed101179ef0b [ 77.842484][ T9030] R10: ffffed101179ef0a R11: 0000000000000003 R12: 0000000000000000 [ 77.850439][ T9030] R13: 0000000000000118 R14: dffffc0000000000 R15: 0000000000000000 [ 77.858433][ T9030] FS: 0000000001f32880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 77.867388][ T9030] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.873984][ T9030] CR2: 000000000043edde CR3: 0000000008e6d000 CR4: 00000000001406e0 [ 77.882062][ T9030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.890018][ T9030] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.898201][ T9030] Kernel panic - not syncing: Fatal exception [ 77.905622][ T9030] Kernel Offset: disabled [ 77.909942][ T9030] Rebooting in 86400 seconds..