[....] Starting enhanced syslogd: rsyslogd[ 13.603807] audit: type=1400 audit(1541300568.780:4): avc: denied { syslog } for pid=1925 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[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.53' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.247460] kasan: CONFIG_KASAN_INLINE enabled [ 39.251891] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.264783] Modules linked in: [ 39.268084] CPU: 0 PID: 2083 Comm: syz-executor409 Not tainted 4.4.162+ #117 [ 39.275250] task: ffff8801d4138000 task.stack: ffff8801d3d40000 [ 39.281283] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 39.290302] RSP: 0018:ffff8801d3d47970 EFLAGS: 00010206 [ 39.295729] RAX: dffffc0000000000 RBX: ffff8801d4308000 RCX: 0000000000000000 [ 39.303019] RDX: 000000000000000c RSI: ffffffff8246ea06 RDI: 0000000000000060 [ 39.310268] RBP: ffff8801d3d479b0 R08: 0000000000000001 R09: 0000000000000001 [ 39.317511] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d5baa000 [ 39.324752] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d5baa058 [ 39.332043] FS: 00000000025e2880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 39.340247] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.346104] CR2: 0000000020000480 CR3: 00000001d6cad000 CR4: 00000000001606b0 [ 39.353356] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.360602] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.367883] Stack: [ 39.370047] ffff8801d4308088 ffff880100000001 ffff8801d4308088 ffff8801d4308000 [ 39.378046] ffff8801d5baa000 dffffc0000000000 ffff8801d5baa058 0000000000000000 [ 39.386122] ffff8801d3d47a20 ffffffff821d134b ffff8801d4308430 ffff8801d4308188 [ 39.394235] Call Trace: [ 39.396800] [] release_sock+0x17b/0x500 [ 39.402396] [] udp_sendmsg+0x1152/0x1c70 [ 39.408086] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 39.414571] [] ? udp_lib_close+0x20/0x20 [ 39.420264] [] ? udp_lib_unhash+0x630/0x630 [ 39.426275] [] ? trace_hardirqs_on+0x10/0x10 [ 39.432317] [] ? sock_has_perm+0x1c1/0x3f0 [ 39.438173] [] ? sock_has_perm+0x2a1/0x3f0 [ 39.444033] [] ? sock_has_perm+0x9f/0x3f0 [ 39.449803] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 39.457432] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.464158] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.470951] [] ? check_preemption_disabled+0x3b/0x170 [ 39.477772] [] ? inet_sendmsg+0x143/0x4d0 [ 39.483541] [] inet_sendmsg+0x203/0x4d0 [ 39.489146] [] ? inet_sendmsg+0x73/0x4d0 [ 39.494870] [] ? inet_recvmsg+0x4c0/0x4c0 [ 39.500663] [] sock_sendmsg+0xbb/0x110 [ 39.506178] [] SyS_sendto+0x220/0x370 [ 39.511602] [] ? SyS_getpeername+0x2d0/0x2d0 [ 39.517637] [] ? udp_v4_get_port+0xcb/0x100 [ 39.523580] [] ? SyS_bind+0x18a/0x280 [ 39.529005] [] ? SyS_socketpair+0x520/0x520 [ 39.534958] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.541173] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.547903] [] ? check_preemption_disabled+0x3b/0x170 [ 39.554761] [] ? SyS_dup2+0x165/0x2f0 [ 39.560280] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.566804] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 39.573369] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 da 82 e9 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 [ 39.600335] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 39.606925] RSP [ 39.610594] ---[ end trace cf3e3c8e250b3592 ]--- [ 39.615339] Kernel panic - not syncing: Fatal exception in interrupt [ 39.622086] Kernel Offset: disabled [ 39.625692] Rebooting in 86400 seconds..