[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.280503] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.227330] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.510957] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.462074] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. executing program executing program [ 31.820805] kasan: CONFIG_KASAN_INLINE enabled [ 31.825249] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.838101] Dumping ftrace buffer: [ 31.841610] (ftrace buffer empty) [ 31.845290] Modules linked in: [ 31.848574] CPU: 0 PID: 3849 Comm: syz-executor908 Not tainted 4.4.138-g07c0138 #62 [ 31.856350] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.865681] task: ffff8801d9a86000 task.stack: ffff8801c6190000 [ 31.871705] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1570 [ 31.880638] RSP: 0018:ffff8801c61977f8 EFLAGS: 00010206 [ 31.886065] RAX: dffffc0000000000 RBX: ffff8800bba98000 RCX: 1ffff1003b1d72fb [ 31.893305] RDX: 000000000000000c RSI: ffffffff832d3006 RDI: 0000000000000060 [ 31.900549] RBP: ffff8801c6197838 R08: ffffffff85313370 R09: 0000000000000001 [ 31.907791] R10: 0000000000000000 R11: ffff8801d9a86000 R12: ffff8801d8eb9780 [ 31.915401] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d8eb97d8 [ 31.922647] FS: 00000000018a3880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.930842] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.936696] CR2: 0000000020000000 CR3: 00000001ce100000 CR4: 00000000001606f0 [ 31.943945] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.951186] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.958424] Stack: [ 31.960548] ffff8800bba98088 ffff880100000001 ffff8800bba98088 ffff8800bba98000 [ 31.968534] ffff8801d8eb9780 dffffc0000000000 ffff8801d8eb97d8 0000000000000000 [ 31.976522] ffff8801c61978a8 ffffffff82f2b70b ffff8800bba98430 ffff8800bba98188 [ 31.984511] Call Trace: [ 31.987076] [] release_sock+0x17b/0x500 [ 31.992673] [] udp_sendmsg+0x1152/0x1c70 [ 31.998358] [] ? udp_push_pending_frames+0xe0/0xe0 [ 32.004908] [] ? udp4_lib_lookup+0x60/0x60 [ 32.010767] [] ? debug_check_no_locks_freed+0x210/0x210 [ 32.017755] [] ? sock_has_perm+0x1c1/0x400 [ 32.023609] [] ? sock_has_perm+0x29f/0x400 [ 32.029471] [] ? sock_has_perm+0x9f/0x400 [ 32.035242] [] ? inet_sendmsg+0x143/0x4d0 [ 32.041012] [] inet_sendmsg+0x203/0x4d0 [ 32.046616] [] ? inet_sendmsg+0x73/0x4d0 [ 32.052299] [] ? inet_recvmsg+0x4c0/0x4c0 [ 32.058076] [] sock_sendmsg+0xcc/0x110 [ 32.063581] [] ___sys_sendmsg+0x745/0x880 [ 32.069349] [] ? copy_msghdr_from_user+0x550/0x550 [ 32.075902] [] ? inet_sendmsg+0x143/0x4d0 [ 32.081670] [] ? inet_sendmsg+0x20a/0x4d0 [ 32.087436] [] ? inet_sendmsg+0x73/0x4d0 [ 32.093116] [] ? inet_recvmsg+0x4c0/0x4c0 [ 32.098884] [] ? sock_sendmsg+0x4f/0x110 [ 32.104574] [] ? SYSC_connect+0x300/0x300 [ 32.110342] [] ? __lock_acquire+0xa86/0x5270 [ 32.116380] [] ? udp_v4_get_port+0x139/0x180 [ 32.122407] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 32.129134] [] ? __fget_light+0x9f/0x1f0 [ 32.134815] [] ? __fdget+0x18/0x20 [ 32.139978] [] __sys_sendmsg+0xd6/0x190 [ 32.145575] [] ? SyS_shutdown+0x1b0/0x1b0 [ 32.151352] [] SyS_sendmsg+0x2d/0x50 [ 32.156689] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.163323] Code: 74 24 58 41 f6 c6 01 0f 85 a6 07 00 00 e8 aa e4 07 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 25 0e 00 00 41 f6 46 60 04 [ 32.190082] RIP [] udp_queue_rcv_skb+0x18f/0x1570 [ 32.196671] RSP [ 32.200300] ---[ end trace 78dbd0e2193b3977 ]--- [ 32.205051] Kernel panic - not syncing: Fatal exception in interrupt [ 32.211952] Dumping ftrace buffer: [ 32.215468] (ftrace buffer empty) [ 32.219151] Kernel Offset: disabled [ 32.222748] Rebooting in 86400 seconds..