[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.017232][ T27] audit: type=1800 audit(1580391142.140:25): pid=8792 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.037545][ T27] audit: type=1800 audit(1580391142.140:26): pid=8792 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.092342][ T27] audit: type=1800 audit(1580391142.140:27): pid=8792 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.204' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 69.792144][ T8944] IPVS: ftp: loaded support on port[0] = 21 [ 69.840427][ T8946] BUG: unable to handle page fault for address: ffff887fa2809fff [ 69.848307][ T8946] #PF: supervisor read access in kernel mode [ 69.854272][ T8946] #PF: error_code(0x0000) - not-present page [ 69.860425][ T8946] PGD 0 P4D 0 [ 69.864775][ T8946] Oops: 0000 [#1] PREEMPT SMP KASAN [ 69.870079][ T8946] CPU: 1 PID: 8946 Comm: syz-executor919 Not tainted 5.5.0-syzkaller #0 [ 69.878670][ T8946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.888725][ T8946] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 69.895220][ T8946] Code: 74 08 48 89 df e8 fa 3a 50 fb 4c 89 33 48 8b 9d 60 ff ff ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 3a 3a 50 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 f6 35 13 fb 48 89 [ 69.915103][ T8946] RSP: 0018:ffffc90000e77958 EFLAGS: 00010246 [ 69.921507][ T8946] RAX: 1ffff10ff45013ff RBX: ffff887fa2809fff RCX: 0000000000000100 [ 69.929517][ T8946] RDX: ffff88809d6cb470 RSI: 0000000000000000 RDI: ffffc90000e77a88 [ 69.937576][ T8946] RBP: ffffc90000e77a78 R08: ffffffff8663cee3 R09: ffffed10144ff45d [ 69.945555][ T8946] R10: ffffed10144ff45d R11: 0000000000000000 R12: ffff88809d6cb4c8 [ 69.955960][ T8946] R13: ffff88809d6cb400 R14: ffff8880a27fa000 R15: dffffc0000000000 [ 69.963927][ T8946] FS: 0000000002065880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 69.973098][ T8946] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.979830][ T8946] CR2: ffff887fa2809fff CR3: 000000008cf00000 CR4: 00000000001406e0 [ 69.987793][ T8946] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.996060][ T8946] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.004021][ T8946] Call Trace: [ 70.007401][ T8946] do_xdp_generic+0x39/0x110 [ 70.012072][ T8946] tun_get_user+0x1d9d/0x3790 [ 70.017015][ T8946] ? rcu_lock_release+0x21/0x30 [ 70.022017][ T8946] tun_chr_write_iter+0xac/0x130 [ 70.026959][ T8946] do_iter_readv_writev+0x651/0x8e0 [ 70.032423][ T8946] do_iter_write+0x180/0x590 [ 70.037029][ T8946] ? import_iovec+0x122/0x2a0 [ 70.041799][ T8946] do_writev+0x239/0x490 [ 70.046906][ T8946] ? check_preemption_disabled+0xb4/0x260 [ 70.052811][ T8946] ? debug_smp_processor_id+0x9/0x20 [ 70.058309][ T8946] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 70.064034][ T8946] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 70.069756][ T8946] ? do_syscall_64+0x1d/0x1c0 [ 70.076366][ T8946] __x64_sys_writev+0x7d/0x90 [ 70.081256][ T8946] do_syscall_64+0xf7/0x1c0 [ 70.085870][ T8946] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.091766][ T8946] RIP: 0033:0x441f50 [ 70.095774][ T8946] Code: 05 48 3d 01 f0 ff ff 0f 83 5d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d c1 90 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 34 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00 [ 70.115850][ T8946] RSP: 002b:00007ffcfb97f858 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 70.124511][ T8946] RAX: ffffffffffffffda RBX: 00007ffcfb97f870 RCX: 0000000000441f50 [ 70.132477][ T8946] RDX: 0000000000000001 RSI: 00007ffcfb97f8a0 RDI: 00000000000000f0 [ 70.140611][ T8946] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004 [ 70.148657][ T8946] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000001109b [ 70.156713][ T8946] R13: 0000000000402da0 R14: 0000000000000000 R15: 0000000000000000 [ 70.164687][ T8946] Modules linked in: [ 70.168567][ T8946] CR2: ffff887fa2809fff [ 70.172743][ T8946] ---[ end trace a5490c9adf7efeff ]--- [ 70.178193][ T8946] RIP: 0010:netif_receive_generic_xdp+0x566/0x11d0 [ 70.184675][ T8946] Code: 74 08 48 89 df e8 fa 3a 50 fb 4c 89 33 48 8b 9d 60 ff ff ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 3a 3a 50 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 f6 35 13 fb 48 89 [ 70.205074][ T8946] RSP: 0018:ffffc90000e77958 EFLAGS: 00010246 [ 70.211142][ T8946] RAX: 1ffff10ff45013ff RBX: ffff887fa2809fff RCX: 0000000000000100 [ 70.219136][ T8946] RDX: ffff88809d6cb470 RSI: 0000000000000000 RDI: ffffc90000e77a88 [ 70.227261][ T8946] RBP: ffffc90000e77a78 R08: ffffffff8663cee3 R09: ffffed10144ff45d [ 70.235368][ T8946] R10: ffffed10144ff45d R11: 0000000000000000 R12: ffff88809d6cb4c8 [ 70.243329][ T8946] R13: ffff88809d6cb400 R14: ffff8880a27fa000 R15: dffffc0000000000 [ 70.251444][ T8946] FS: 0000000002065880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 70.260574][ T8946] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.267141][ T8946] CR2: ffff887fa2809fff CR3: 000000008cf00000 CR4: 00000000001406e0 [ 70.275182][ T8946] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.283219][ T8946] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.291270][ T8946] Kernel panic - not syncing: Fatal exception in interrupt [ 70.300427][ T8946] Kernel Offset: disabled [ 70.304749][ T8946] Rebooting in 86400 seconds..