[....] Starting enhanced syslogd: rsyslogd[ 13.561647] audit: type=1400 audit(1542298160.600:4): 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.79' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.272509] kasan: CONFIG_KASAN_INLINE enabled [ 30.276943] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.289768] Modules linked in: [ 30.293052] CPU: 0 PID: 2073 Comm: syz-executor365 Not tainted 4.4.163+ #122 [ 30.300206] task: ffff8801d5d84740 task.stack: ffff8801d4290000 [ 30.306232] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.315162] RSP: 0018:ffff8801d4297970 EFLAGS: 00010206 [ 30.320595] RAX: dffffc0000000000 RBX: ffff8800b64e8000 RCX: 0000000000000000 [ 30.327834] RDX: 000000000000000c RSI: ffffffff8247ad36 RDI: 0000000000000060 [ 30.335074] RBP: ffff8801d42979b0 R08: 0000000000000001 R09: 0000000000000001 [ 30.342313] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d4efddc0 [ 30.349597] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d4efde18 [ 30.356842] FS: 000000000216f880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 30.365042] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.370893] CR2: 0000000020000340 CR3: 00000001d4eea000 CR4: 00000000001606b0 [ 30.378138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.385382] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.392620] Stack: [ 30.394754] ffff8800b64e8088 ffff880100000001 ffff8800b64e8088 ffff8800b64e8000 [ 30.402748] ffff8801d4efddc0 dffffc0000000000 ffff8801d4efde18 0000000000000000 [ 30.410727] ffff8801d4297a20 ffffffff821dd5cb ffff8800b64e8430 ffff8800b64e8188 [ 30.418727] Call Trace: [ 30.421293] [] release_sock+0x17b/0x500 [ 30.426892] [] udp_sendmsg+0x1152/0x1c70 [ 30.432579] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 30.439056] [] ? udp_lib_close+0x20/0x20 [ 30.444741] [] ? udp_lib_unhash+0x630/0x630 [ 30.450686] [] ? trace_hardirqs_on+0x10/0x10 [ 30.456722] [] ? sock_has_perm+0x1c1/0x3f0 [ 30.462576] [] ? sock_has_perm+0x2a1/0x3f0 [ 30.468450] [] ? sock_has_perm+0x9f/0x3f0 [ 30.474219] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 30.481760] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.488517] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.495247] [] ? check_preemption_disabled+0x3b/0x200 [ 30.502058] [] ? inet_sendmsg+0x143/0x4d0 [ 30.507829] [] inet_sendmsg+0x203/0x4d0 [ 30.513428] [] ? inet_sendmsg+0x73/0x4d0 [ 30.519110] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.524882] [] sock_sendmsg+0xbb/0x110 [ 30.530392] [] SyS_sendto+0x220/0x370 [ 30.535822] [] ? SyS_getpeername+0x2d0/0x2d0 [ 30.541865] [] ? udp_v4_get_port+0xcb/0x100 [ 30.547808] [] ? SyS_bind+0x18a/0x280 [ 30.553231] [] ? SyS_socketpair+0x520/0x520 [ 30.559175] [] ? get_unused_fd_flags+0xd0/0xd0 [ 30.565396] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.572120] [] ? check_preemption_disabled+0x3b/0x200 [ 30.578933] [] ? SyS_dup2+0x165/0x2f0 [ 30.584372] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.590851] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 30.597397] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 4a c5 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 [ 30.624280] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 30.630866] RSP [ 30.634487] ---[ end trace 0236d1bb0bb49c5e ]--- [ 30.639235] Kernel panic - not syncing: Fatal exception in interrupt [ 30.646046] Kernel Offset: disabled [ 30.649653] Rebooting in 86400 seconds..