[....] Starting enhanced syslogd: rsyslogd[ 12.640468] audit: type=1400 audit(1537527035.802:4): avc: denied { syslog } for pid=1923 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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 '10.128.0.115' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.287468] kasan: CONFIG_KASAN_INLINE enabled [ 30.291908] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.304738] Modules linked in: [ 30.308026] CPU: 0 PID: 2075 Comm: syz-executor184 Not tainted 4.4.157+ #101 [ 30.315203] task: ffff8801d53c5f00 task.stack: ffff8801d4130000 [ 30.321234] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.330179] RSP: 0018:ffff8801d4137970 EFLAGS: 00010206 [ 30.335618] RAX: dffffc0000000000 RBX: ffff8800b6a30000 RCX: 0000000000000000 [ 30.342865] RDX: 000000000000000c RSI: ffffffff823fe986 RDI: 0000000000000060 [ 30.350111] RBP: ffff8801d41379b0 R08: 0000000000000001 R09: 0000000000000001 [ 30.357359] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d6701b40 [ 30.364604] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d6701b98 [ 30.371852] FS: 0000000001617880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 30.380054] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.385912] CR2: 0000000020000000 CR3: 00000000b73b5000 CR4: 00000000001606b0 [ 30.394048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.401301] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.408563] Stack: [ 30.410689] ffff8800b6a30088 ffff880100000001 ffff8800b6a30088 ffff8800b6a30000 [ 30.418684] ffff8801d6701b40 dffffc0000000000 ffff8801d6701b98 0000000000000000 [ 30.426663] ffff8801d4137a20 ffffffff82168d3b ffff8800b6a30430 ffff8800b6a30188 [ 30.434639] Call Trace: [ 30.437203] [] release_sock+0x17b/0x500 [ 30.442802] [] udp_sendmsg+0x1152/0x1c70 [ 30.448487] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 30.454967] [] ? udp_lib_close+0x20/0x20 [ 30.460652] [] ? udp_lib_unhash+0x630/0x630 [ 30.466598] [] ? trace_hardirqs_on+0x10/0x10 [ 30.472628] [] ? sock_has_perm+0x1c1/0x3f0 [ 30.478488] [] ? sock_has_perm+0x2a1/0x3f0 [ 30.484345] [] ? sock_has_perm+0x9f/0x3f0 [ 30.490118] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 30.497626] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.504350] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.511081] [] ? check_preemption_disabled+0x3b/0x170 [ 30.517894] [] ? inet_sendmsg+0x143/0x4d0 [ 30.523666] [] inet_sendmsg+0x203/0x4d0 [ 30.529262] [] ? inet_sendmsg+0x73/0x4d0 [ 30.534949] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.540721] [] sock_sendmsg+0xbb/0x110 [ 30.546231] [] SyS_sendto+0x220/0x370 [ 30.551658] [] ? SyS_getpeername+0x2d0/0x2d0 [ 30.557705] [] ? udp_v4_get_port+0xcb/0x100 [ 30.563650] [] ? SyS_bind+0x18a/0x280 [ 30.569071] [] ? SyS_socketpair+0x520/0x520 [ 30.575016] [] ? get_unused_fd_flags+0xd0/0xd0 [ 30.581224] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.587953] [] ? check_preemption_disabled+0x3b/0x170 [ 30.594769] [] ? SyS_dup2+0x165/0x2f0 [ 30.600197] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.606663] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 30.613211] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 fa 63 ef 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 [ 30.640005] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.646613] RSP [ 30.650249] ---[ end trace 62c8620ad49f4c91 ]--- [ 30.654990] Kernel panic - not syncing: Fatal exception in interrupt [ 30.661853] Kernel Offset: disabled [ 30.665463] Rebooting in 86400 seconds..