[....] Starting enhanced syslogd: rsyslogd[ 14.205811] audit: type=1400 audit(1545520601.240:4): avc: denied { syslog } for pid=1921 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 30.331092] kasan: CONFIG_KASAN_INLINE enabled [ 30.335514] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.348454] Modules linked in: [ 30.351782] CPU: 1 PID: 2075 Comm: syz-executor858 Not tainted 4.4.169+ #7 [ 30.358769] task: ffff8800b81fdf00 task.stack: ffff8801d4218000 [ 30.364797] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.373747] RSP: 0018:ffff8801d421f878 EFLAGS: 00010206 [ 30.379172] RAX: dffffc0000000000 RBX: ffff8801d4238000 RCX: 0000000000000000 [ 30.386416] RDX: 000000000000000c RSI: ffffffff8247d616 RDI: 0000000000000060 [ 30.393665] RBP: ffff8801d421f8b8 R08: 0000000000000001 R09: 0000000000000001 [ 30.400909] R10: 0000000000000000 R11: ffffffff831a49f8 R12: ffff8801d4776000 [ 30.408154] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d4776058 [ 30.415399] FS: 0000000002120880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 30.423598] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.429451] CR2: 0000000020000080 CR3: 00000001d4e12000 CR4: 00000000001606b0 [ 30.436699] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.443947] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.451191] Stack: [ 30.453316] ffff8801d4238088 ffff880100000001 ffff8801d4238088 ffff8801d4238000 [ 30.461305] ffff8801d4776000 dffffc0000000000 ffff8801d4776058 0000000000000000 [ 30.469309] ffff8801d421f928 ffffffff821dfadb ffff8801d4238430 ffff8801d4238188 [ 30.477305] Call Trace: [ 30.479887] [] release_sock+0x17b/0x500 [ 30.485492] [] udp_sendmsg+0x1152/0x1c70 [ 30.491181] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 30.497648] [] ? udp_lib_close+0x20/0x20 [ 30.503435] [] ? udp_lib_unhash+0x630/0x630 [ 30.509417] [] ? trace_hardirqs_on+0x10/0x10 [ 30.515452] [] ? sock_has_perm+0x1c1/0x3f0 [ 30.521317] [] ? sock_has_perm+0x2a1/0x3f0 [ 30.527179] [] ? sock_has_perm+0x9f/0x3f0 [ 30.532969] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 30.540481] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.547210] [] ? check_preemption_disabled+0x3b/0x200 [ 30.554026] [] ? inet_sendmsg+0x143/0x4d0 [ 30.559799] [] inet_sendmsg+0x203/0x4d0 [ 30.565395] [] ? inet_sendmsg+0x73/0x4d0 [ 30.571129] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.576931] [] sock_sendmsg+0xbb/0x110 [ 30.582446] [] sock_write_iter+0x223/0x3b0 [ 30.588307] [] ? sock_sendmsg+0x110/0x110 [ 30.594085] [] ? inode_has_perm.isra.20+0x10c/0x160 [ 30.600726] [] ? iov_iter_init+0xaf/0x1d0 [ 30.606499] [] __vfs_write+0x304/0x3e0 [ 30.612009] [] ? __vfs_read+0x3d0/0x3d0 [ 30.617608] [] ? udp_v4_get_port+0xcb/0x100 [ 30.623561] [] ? selinux_file_permission+0x2f2/0x450 [ 30.630296] [] ? rw_verify_area+0x100/0x2f0 [ 30.636246] [] vfs_write+0x17e/0x4e0 [ 30.641583] [] SyS_write+0xd9/0x1c0 [ 30.646833] [] ? SyS_read+0x1c0/0x1c0 [ 30.652262] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.658736] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 30.665285] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 6a 9c e8 fe 49 83 e6 fe 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 60 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e d1 0e 00 00 41 f6 46 60 04 [ 30.692251] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.698839] RSP [ 30.702507] ---[ end trace 41512a47b8cdaef7 ]--- [ 30.707265] Kernel panic - not syncing: Fatal exception in interrupt [ 30.714038] Kernel Offset: disabled [ 30.717648] Rebooting in 86400 seconds..