[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 53.208470][ T27] audit: type=1800 audit(1579470052.924:25): pid=8521 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 53.232847][ T27] audit: type=1800 audit(1579470052.924:26): pid=8521 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 53.274691][ T27] audit: type=1800 audit(1579470052.924:27): pid=8521 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 '10.128.0.86' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.855457][ T8674] IPVS: ftp: loaded support on port[0] = 21 [ 62.894423][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.902768][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.910900][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.920163][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.928419][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.936855][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.945063][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.953322][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.961475][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.969694][ T8674] netlink: 'syz-executor209': attribute type 1 has an invalid length. [ 62.978263][ T8674] BUG: unable to handle page fault for address: ffff887fa68f57ff [ 62.985974][ T8674] #PF: supervisor read access in kernel mode [ 62.991928][ T8674] #PF: error_code(0x0000) - not-present page [ 62.997880][ T8674] PGD 0 P4D 0 [ 63.001231][ T8674] Oops: 0000 [#1] PREEMPT SMP KASAN [ 63.006400][ T8674] CPU: 0 PID: 8674 Comm: syz-executor209 Not tainted 5.5.0-rc6-syzkaller #0 [ 63.015069][ T8674] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.025126][ T8674] RIP: 0010:netif_receive_generic_xdp+0x56c/0x11b0 [ 63.031602][ T8674] Code: 74 08 48 89 df e8 d4 3f 60 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 14 3f 60 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 80 00 24 fb 48 89 [ 63.051182][ T8674] RSP: 0018:ffffc90001d07958 EFLAGS: 00010246 [ 63.057230][ T8674] RAX: 1ffff10ff4d1eaff RBX: ffff887fa68f57ff RCX: 0000000000000100 [ 63.065186][ T8674] RDX: ffff88808e5e1bb0 RSI: 0000000000000000 RDI: ffffc90001d07a88 [ 63.073144][ T8674] RBP: ffffc90001d07a78 R08: ffffffff86527ef6 R09: ffffed1014d1cb5d [ 63.081106][ T8674] R10: ffffed1014d1cb5d R11: 0000000000000000 R12: ffff88808e5e1c08 [ 63.089068][ T8674] R13: ffff88808e5e1b40 R14: ffff8880a68e5800 R15: dffffc0000000000 [ 63.097031][ T8674] FS: 000000000222b880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 63.105947][ T8674] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.112521][ T8674] CR2: ffff887fa68f57ff CR3: 00000000a767b000 CR4: 00000000001406f0 [ 63.120500][ T8674] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.128463][ T8674] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.136457][ T8674] Call Trace: [ 63.139754][ T8674] do_xdp_generic+0x39/0x110 [ 63.144346][ T8674] tun_get_user+0x1dfb/0x37b0 [ 63.149015][ T8674] ? rcu_lock_release+0x21/0x30 [ 63.153862][ T8674] tun_chr_write_iter+0xac/0x130 [ 63.158799][ T8674] do_iter_readv_writev+0x651/0x8e0 [ 63.163997][ T8674] do_iter_write+0x180/0x590 [ 63.168583][ T8674] ? import_iovec+0x122/0x2a0 [ 63.173311][ T8674] do_writev+0x239/0x490 [ 63.177561][ T8674] ? switch_fpu_return+0xe/0x10 [ 63.182394][ T8674] ? prepare_exit_to_usermode+0x221/0x5b0 [ 63.188099][ T8674] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 63.193808][ T8674] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 63.199255][ T8674] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 63.204979][ T8674] ? do_syscall_64+0x1d/0x1c0 [ 63.209649][ T8674] __x64_sys_writev+0x7d/0x90 [ 63.214320][ T8674] do_syscall_64+0xf7/0x1c0 [ 63.218822][ T8674] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.224695][ T8674] RIP: 0033:0x441b80 [ 63.228613][ T8674] Code: 05 48 3d 01 f0 ff ff 0f 83 fd 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d b1 94 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 0e fc ff c3 48 83 ec 08 e8 7a 2b 00 00 [ 63.248209][ T8674] RSP: 002b:00007ffce002a868 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 63.256610][ T8674] RAX: ffffffffffffffda RBX: 00007ffce002a880 RCX: 0000000000441b80 [ 63.264572][ T8674] RDX: 0000000000000001 RSI: 00007ffce002a8b0 RDI: 00000000000000f0 [ 63.272536][ T8674] RBP: 0000000000000003 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 63.280493][ T8674] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000000 [ 63.288457][ T8674] R13: 0000000000402f70 R14: 0000000000000000 R15: 0000000000000000 [ 63.296425][ T8674] Modules linked in: [ 63.300322][ T8674] CR2: ffff887fa68f57ff [ 63.304465][ T8674] ---[ end trace c048216667cfb4ff ]--- [ 63.310043][ T8674] RIP: 0010:netif_receive_generic_xdp+0x56c/0x11b0 [ 63.316574][ T8674] Code: 74 08 48 89 df e8 d4 3f 60 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 14 3f 60 fb <48> 8b 33 83 e6 01 31 ff 48 89 b5 f0 fe ff ff e8 80 00 24 fb 48 89 [ 63.336267][ T8674] RSP: 0018:ffffc90001d07958 EFLAGS: 00010246 [ 63.342325][ T8674] RAX: 1ffff10ff4d1eaff RBX: ffff887fa68f57ff RCX: 0000000000000100 [ 63.350289][ T8674] RDX: ffff88808e5e1bb0 RSI: 0000000000000000 RDI: ffffc90001d07a88 [ 63.358249][ T8674] RBP: ffffc90001d07a78 R08: ffffffff86527ef6 R09: ffffed1014d1cb5d [ 63.366215][ T8674] R10: ffffed1014d1cb5d R11: 0000000000000000 R12: ffff88808e5e1c08 [ 63.374175][ T8674] R13: ffff88808e5e1b40 R14: ffff8880a68e5800 R15: dffffc0000000000 [ 63.382147][ T8674] FS: 000000000222b880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 63.391068][ T8674] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.397639][ T8674] CR2: ffff887fa68f57ff CR3: 00000000a767b000 CR4: 00000000001406f0 [ 63.405629][ T8674] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.413580][ T8674] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.421542][ T8674] Kernel panic - not syncing: Fatal exception in interrupt [ 63.430020][ T8674] Kernel Offset: disabled [ 63.434348][ T8674] Rebooting in 86400 seconds..