[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 86.622033][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 86.622045][ T27] audit: type=1800 audit(1580332446.152:29): pid=9658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 86.650064][ T27] audit: type=1800 audit(1580332446.162:30): pid=9658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.144' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 95.891608][ T9811] IPVS: ftp: loaded support on port[0] = 21 [ 95.944160][ T9811] BUG: unable to handle page fault for address: ffff887f9db07fff [ 95.951921][ T9811] #PF: supervisor read access in kernel mode [ 95.957968][ T9811] #PF: error_code(0x0000) - not-present page [ 95.963946][ T9811] PGD 0 P4D 0 [ 95.967361][ T9811] Oops: 0000 [#1] PREEMPT SMP KASAN [ 95.972543][ T9811] CPU: 1 PID: 9811 Comm: syz-executor621 Not tainted 5.5.0-syzkaller #0 [ 95.980915][ T9811] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.990980][ T9811] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 95.997298][ T9811] Code: 03 48 89 85 f0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 a5 78 ff ff ff 80 3c 02 00 48 89 8d c8 fe ff ff 0f 85 ac 10 00 00 <49> 8b 04 24 49 8d 7c 24 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 [ 96.018193][ T9811] RSP: 0018:ffffc90001fe7770 EFLAGS: 00010246 [ 96.024356][ T9811] RAX: dffffc0000000000 RBX: ffff88809daf8000 RCX: ffffffff0000feff [ 96.032660][ T9811] RDX: 1ffff10ff3b60fff RSI: ffff8880a384dcf0 RDI: 0000000000000005 [ 96.040645][ T9811] RBP: ffffc90001fe78b0 R08: ffff88809165e040 R09: ffffed1013b5f05d [ 96.048697][ T9811] R10: ffffed1013b5f05c R11: ffff88809daf82e3 R12: ffff887f9db07fff [ 96.057723][ T9811] R13: 0000000000000100 R14: ffff88809db07fff R15: ffff8880a384dc80 [ 96.065871][ T9811] FS: 0000000000dc0880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 96.074923][ T9811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 96.081554][ T9811] CR2: ffff887f9db07fff CR3: 00000000a36d4000 CR4: 00000000001406e0 [ 96.089568][ T9811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 96.097640][ T9811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 96.105716][ T9811] Call Trace: [ 96.109021][ T9811] ? generic_xdp_tx+0x740/0x740 [ 96.113917][ T9811] ? rcu_read_lock_held+0x9c/0xb0 [ 96.118959][ T9811] do_xdp_generic+0x30/0x50 [ 96.123475][ T9811] tun_get_user+0x2bcd/0x4020 [ 96.128141][ T9811] ? __kasan_check_read+0x11/0x20 [ 96.133151][ T9811] ? aa_file_perm+0x617/0x1600 [ 96.137922][ T9811] ? tun_build_skb.isra.0+0x1480/0x1480 [ 96.143493][ T9811] ? rcu_read_lock_held+0x9c/0xb0 [ 96.148521][ T9811] ? __kasan_check_read+0x11/0x20 [ 96.153619][ T9811] tun_chr_write_iter+0xbd/0x156 [ 96.158557][ T9811] do_iter_readv_writev+0x5f8/0x8f0 [ 96.163761][ T9811] ? no_seek_end_llseek_size+0x70/0x70 [ 96.169288][ T9811] ? apparmor_file_permission+0x27/0x30 [ 96.174836][ T9811] ? rw_verify_area+0x126/0x360 [ 96.179759][ T9811] do_iter_write+0x184/0x610 [ 96.184688][ T9811] ? dup_iter+0x260/0x260 [ 96.189020][ T9811] ? sendmsg_copy_msghdr+0x70/0x70 [ 96.194153][ T9811] vfs_writev+0x1b3/0x2f0 [ 96.198485][ T9811] ? vfs_iter_write+0xb0/0xb0 [ 96.203266][ T9811] ? __do_sys_bpf+0x938/0x41e0 [ 96.208022][ T9811] ? __fget_light+0x1a9/0x230 [ 96.212746][ T9811] ? __fdget+0x1b/0x20 [ 96.216809][ T9811] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 96.223101][ T9811] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 96.229470][ T9811] ? __fget_light+0x1a9/0x230 [ 96.234152][ T9811] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 96.240510][ T9811] do_writev+0x15b/0x330 [ 96.244740][ T9811] ? vfs_writev+0x2f0/0x2f0 [ 96.249244][ T9811] ? do_syscall_64+0x26/0x790 [ 96.254042][ T9811] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 96.260260][ T9811] ? do_syscall_64+0x26/0x790 [ 96.265126][ T9811] __x64_sys_writev+0x75/0xb0 [ 96.269810][ T9811] do_syscall_64+0xfa/0x790 [ 96.274508][ T9811] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 96.280701][ T9811] RIP: 0033:0x441920 [ 96.285205][ T9811] 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 f1 96 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 [ 96.305129][ T9811] RSP: 002b:00007ffc99548a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 96.313641][ T9811] RAX: ffffffffffffffda RBX: 00007ffc99548a30 RCX: 0000000000441920 [ 96.321627][ T9811] RDX: 0000000000000001 RSI: 00007ffc99548a60 RDI: 00000000000000f0 [ 96.329908][ T9811] RBP: 00007ffc99548a20 R08: 0000000000000000 R09: 00000000bb1414ac [ 96.337992][ T9811] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000003 [ 96.345959][ T9811] R13: 00007ffc99548a28 R14: 0000000000000000 R15: 0000000000000000 [ 96.354061][ T9811] Modules linked in: [ 96.357950][ T9811] CR2: ffff887f9db07fff [ 96.362103][ T9811] ---[ end trace b15eeb0ae12ccf00 ]--- [ 96.367897][ T9811] RIP: 0010:do_xdp_generic.part.0+0x479/0x17a0 [ 96.374056][ T9811] Code: 03 48 89 85 f0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 a5 78 ff ff ff 80 3c 02 00 48 89 8d c8 fe ff ff 0f 85 ac 10 00 00 <49> 8b 04 24 49 8d 7c 24 0c 48 ba 00 00 00 00 00 fc ff df 48 89 85 [ 96.393778][ T9811] RSP: 0018:ffffc90001fe7770 EFLAGS: 00010246 [ 96.399843][ T9811] RAX: dffffc0000000000 RBX: ffff88809daf8000 RCX: ffffffff0000feff [ 96.407811][ T9811] RDX: 1ffff10ff3b60fff RSI: ffff8880a384dcf0 RDI: 0000000000000005 [ 96.415897][ T9811] RBP: ffffc90001fe78b0 R08: ffff88809165e040 R09: ffffed1013b5f05d [ 96.424008][ T9811] R10: ffffed1013b5f05c R11: ffff88809daf82e3 R12: ffff887f9db07fff [ 96.431997][ T9811] R13: 0000000000000100 R14: ffff88809db07fff R15: ffff8880a384dc80 [ 96.439969][ T9811] FS: 0000000000dc0880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 96.449108][ T9811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 96.455691][ T9811] CR2: ffff887f9db07fff CR3: 00000000a36d4000 CR4: 00000000001406e0 [ 96.464206][ T9811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 96.472565][ T9811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 96.482537][ T9811] Kernel panic - not syncing: Fatal exception in interrupt [ 96.491315][ T9811] Kernel Offset: disabled [ 96.495662][ T9811] Rebooting in 86400 seconds..