[....] Starting enhanced syslogd: rsyslogd[ 14.510520] audit: type=1400 audit(1571990580.342:4): avc: denied { syslog } for pid=1927 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 '10.128.0.168' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.460482] ------------[ cut here ]------------ [ 26.465346] WARNING: CPU: 1 PID: 2227 at net/ipv4/tcp.c:1737 tcp_recvmsg+0x209b/0x2d10() [ 26.473651] Kernel panic - not syncing: panic_on_warn set ... [ 26.473651] [ 26.480996] CPU: 1 PID: 2227 Comm: syz-executor958 Not tainted 4.4.174+ #4 [ 26.488074] 0000000000000000 4af592cdacfb77d0 ffff8801d2f67808 ffffffff81aad1a1 [ 26.496107] 0000000000000000 ffffffff82835ee0 ffffffff82a85940 00000000000006c9 [ 26.504150] ffffffff823f4dab ffff8801d2f678e8 ffffffff813a48c2 0000000041b58ab3 [ 26.512224] Call Trace: [ 26.514797] [] dump_stack+0xc1/0x120 [ 26.520162] [] ? tcp_recvmsg+0x209b/0x2d10 [ 26.526046] [] panic+0x1b9/0x37b [ 26.531042] [] ? add_taint.cold+0x16/0x16 [ 26.536817] [] ? warn_slowpath_common.cold+0x5/0x20 [ 26.543467] [] warn_slowpath_common.cold+0x20/0x20 [ 26.550025] [] warn_slowpath_null+0x2a/0x30 [ 26.556075] [] tcp_recvmsg+0x209b/0x2d10 [ 26.561774] [] ? tcp_tx_timestamp.part.0+0x230/0x230 [ 26.568506] [] ? check_preemption_disabled+0x3c/0x200 [ 26.575320] [] ? check_preemption_disabled+0x3c/0x200 [ 26.582136] [] ? inet_recvmsg+0x1a8/0x4d0 [ 26.587909] [] inet_recvmsg+0x23e/0x4d0 [ 26.593506] [] ? inet_recvmsg+0xda/0x4d0 [ 26.599193] [] ? csum_and_copy_to_iter+0xf10/0xf10 [ 26.605749] [] ? inet_stream_connect+0xa0/0xa0 [ 26.611956] [] ? selinux_socket_recvmsg+0x3f/0x50 [ 26.618436] [] ? security_socket_recvmsg+0x97/0xc0 [ 26.625004] [] sock_recvmsg+0x8f/0xc0 [ 26.630430] [] ? __sock_recv_ts_and_drops+0x380/0x380 [ 26.637260] [] ___sys_recvmsg+0x257/0x530 [ 26.643047] [] ? ___sys_sendmsg+0x890/0x890 [ 26.648993] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 26.655744] [] ? check_preemption_disabled+0x3c/0x200 [ 26.662567] [] ? check_preemption_disabled+0x3c/0x200 [ 26.669382] [] ? __fget+0x13b/0x370 [ 26.674649] [] ? __fget+0x162/0x370 [ 26.679901] [] ? __fget+0x47/0x370 [ 26.685080] [] ? __fget_light+0xa3/0x1f0 [ 26.690778] [] ? __fdget+0x1b/0x20 [ 26.695946] [] __sys_recvmsg+0xc5/0x160 [ 26.701546] [] ? SyS_sendmmsg+0x60/0x60 [ 26.708644] [] ? retint_user+0x18/0x3c [ 26.714157] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 26.720973] [] SyS_recvmsg+0x2d/0x50 [ 26.726313] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 26.733567] Kernel Offset: disabled [ 26.737207] Rebooting in 86400 seconds..