Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.348958] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 12.417182] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.850393] ------------[ cut here ]------------ [ 20.855204] WARNING: CPU: 0 PID: 2264 at net/core/skbuff.c:4353 skb_try_coalesce+0xeb1/0x1270 [ 20.864117] Kernel panic - not syncing: panic_on_warn set ... [ 20.864117] [ 20.871473] CPU: 0 PID: 2264 Comm: syz-executor023 Not tainted 4.9.125+ #36 [ 20.878545] ffff8801b70373e0 ffffffff81af0ae9 ffffffff82838ba0 00000000ffffffff [ 20.886544] 0000000000000000 0000000000000000 0000000000001101 ffff8801b70374a0 [ 20.894538] ffffffff813df095 0000000041b58ab3 ffffffff82c28773 ffffffff813deed6 [ 20.902547] Call Trace: [ 20.905123] [] dump_stack+0xc1/0x128 [ 20.910467] [] panic+0x1bf/0x39f [ 20.915462] [] ? add_taint.cold.6+0x16/0x16 [ 20.921407] [] ? minmax_running_min+0x19a/0x580 [ 20.927702] [] ? __warn.cold.9+0xa6/0x17f [ 20.933487] [] ? skb_try_coalesce+0xeb1/0x1270 [ 20.939692] [] __warn.cold.9+0xc1/0x17f [ 20.945295] [] ? bictcp_cong_avoid+0xcd/0xdf0 [ 20.951429] [] warn_slowpath_null+0x2c/0x40 [ 20.957393] [] skb_try_coalesce+0xeb1/0x1270 [ 20.963445] [] tcp_try_coalesce+0x159/0x490 [ 20.969399] [] ? tcp_prune_ofo_queue.part.19+0x460/0x460 [ 20.976472] [] ? tcp_try_rmem_schedule+0x13a/0x1010 [ 20.983112] [] tcp_queue_rcv+0x127/0x590 [ 20.988795] [] tcp_data_queue+0x96d/0x38a0 [ 20.994658] [] ? trace_hardirqs_on+0x10/0x10 [ 21.000688] [] ? tcp_fin+0x7c0/0x7c0 [ 21.006058] [] ? tcp_xmit_recovery.part.25+0x120/0x120 [ 21.012962] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 21.019691] [] tcp_rcv_established+0x53d/0x1ff0 [ 21.026003] [] ? check_preemption_disabled+0x3b/0x170 [ 21.032819] [] ? rt6_check+0x114/0x250 [ 21.038329] [] ? tcp_data_queue+0x38a0/0x38a0 [ 21.044468] [] ? rt6_check+0x169/0x250 [ 21.049990] [] ? rt6_check_expired+0x120/0x120 [ 21.056212] [] tcp_v6_do_rcv+0xcd1/0x10e0 [ 21.061982] [] __release_sock+0x13a/0x390 [ 21.067752] [] __sk_flush_backlog+0x27/0x40 [ 21.073697] [] ? ipv6_frag_exit+0x40/0x40 [ 21.079472] [] tcp_sendmsg+0x245e/0x2fd0 [ 21.085157] [] ? tcp_sendpage+0x1910/0x1910 [ 21.091104] [] ? sock_has_perm+0x293/0x3e0 [ 21.096961] [] ? sock_has_perm+0x9f/0x3e0 [ 21.102736] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 21.110268] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 21.117002] [] ? check_preemption_disabled+0x3b/0x170 [ 21.123816] [] ? inet_sendmsg+0x143/0x4d0 [ 21.129587] [] inet_sendmsg+0x203/0x4d0 [ 21.135185] [] ? inet_sendmsg+0x73/0x4d0 [ 21.140871] [] ? inet_recvmsg+0x4c0/0x4c0 [ 21.146641] [] sock_sendmsg+0xbb/0x110 [ 21.152155] [] SyS_sendto+0x220/0x370 [ 21.157598] [] ? SyS_getpeername+0x2d0/0x2d0 [ 21.163632] [] ? _raw_spin_unlock+0x2c/0x50 [ 21.169579] [] ? handle_mm_fault+0x54b/0x2350 [ 21.175698] [] ? vm_insert_page+0x6f0/0x6f0 [ 21.181643] [] ? SyS_bind+0x18a/0x280 [ 21.187068] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 21.193795] [] ? __do_page_fault+0x431/0xa60 [ 21.199830] [] ? up_read+0x1a/0x40 [ 21.204995] [] ? __do_page_fault+0x554/0xa60 [ 21.211029] [] ? do_syscall_64+0x48/0x480 [ 21.216801] [] ? SyS_getpeername+0x2d0/0x2d0 [ 21.222832] [] do_syscall_64+0x19f/0x480 [ 21.228517] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.235722] Dumping ftrace buffer: [ 21.239297] (ftrace buffer empty) [ 21.242986] Kernel Offset: disabled [ 21.246595] Rebooting in 86400 seconds..