[....] Starting enhanced syslogd: rsyslogd[ 13.200364] audit: type=1400 audit(1543282241.273:4): 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 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 '10.128.10.59' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 38.756248] kasan: CONFIG_KASAN_INLINE enabled [ 38.760720] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.773646] Modules linked in: [ 38.776941] CPU: 0 PID: 2083 Comm: syz-executor948 Not tainted 4.4.164+ #123 [ 38.784101] task: ffff8801d45597c0 task.stack: ffff8800b6588000 [ 38.790134] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 38.799078] RSP: 0018:ffff8800b658f970 EFLAGS: 00010206 [ 38.804498] RAX: dffffc0000000000 RBX: ffff8800b65d0000 RCX: 0000000000000000 [ 38.811741] RDX: 000000000000000c RSI: ffffffff8247b426 RDI: 0000000000000060 [ 38.819102] RBP: ffff8800b658f9b0 R08: 0000000000000001 R09: 0000000000000001 [ 38.826508] R10: 0000000000000000 R11: ffffffff831a2c38 R12: ffff8801d578d500 [ 38.833760] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d578d558 [ 38.841007] FS: 00000000025ea880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 38.849275] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.855178] CR2: 0000000020000000 CR3: 00000000b6895000 CR4: 00000000001606b0 [ 38.862430] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.869675] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.876915] Stack: [ 38.879041] ffff8800b65d0088 ffff880100000001 ffff8800b65d0088 ffff8800b65d0000 [ 38.887181] ffff8801d578d500 dffffc0000000000 ffff8801d578d558 0000000000000000 [ 38.895179] ffff8800b658fa20 ffffffff821ddcbb ffff8800b65d0430 ffff8800b65d0188 [ 38.903168] Call Trace: [ 38.905802] [] release_sock+0x17b/0x500 [ 38.911415] [] udp_sendmsg+0x1152/0x1c70 [ 38.917113] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 38.923592] [] ? udp_lib_close+0x20/0x20 [ 38.929279] [] ? udp_lib_unhash+0x630/0x630 [ 38.935232] [] ? trace_hardirqs_on+0x10/0x10 [ 38.941280] [] ? sock_has_perm+0x1c1/0x3f0 [ 38.947227] [] ? sock_has_perm+0x2a1/0x3f0 [ 38.953209] [] ? sock_has_perm+0x9f/0x3f0 [ 38.958993] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 38.966510] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 38.973245] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 38.979994] [] ? check_preemption_disabled+0x3b/0x200 [ 38.986816] [] ? inet_sendmsg+0x143/0x4d0 [ 38.992598] [] inet_sendmsg+0x203/0x4d0 [ 38.998198] [] ? inet_sendmsg+0x73/0x4d0 [ 39.003885] [] ? inet_recvmsg+0x4c0/0x4c0 [ 39.009660] [] sock_sendmsg+0xbb/0x110 [ 39.015175] [] SyS_sendto+0x220/0x370 [ 39.020747] [] ? SyS_getpeername+0x2d0/0x2d0 [ 39.026782] [] ? udp_v4_get_port+0xcb/0x100 [ 39.032735] [] ? SyS_bind+0x18a/0x280 [ 39.038166] [] ? SyS_socketpair+0x520/0x520 [ 39.044114] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.050843] [] ? check_preemption_disabled+0x3b/0x200 [ 39.057663] [] ? SyS_dup2+0x165/0x2f0 [ 39.063092] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.069568] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 39.076191] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 da be 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 [ 39.103127] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 39.109725] RSP [ 39.113368] ---[ end trace 5683715a6757f70b ]--- [ 39.118130] Kernel panic - not syncing: Fatal exception in interrupt [ 39.124974] Kernel Offset: disabled [ 39.128587] Rebooting in 86400 seconds..