[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.166213] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.859290] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.095668] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.084021] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. executing program [ 53.847227] kasan: CONFIG_KASAN_INLINE enabled [ 53.851650] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.864511] Dumping ftrace buffer: [ 53.868035] (ftrace buffer empty) [ 53.871725] Modules linked in: [ 53.875008] CPU: 0 PID: 3814 Comm: syz-executor474 Not tainted 4.4.137-ga2e2217 #61 [ 53.882773] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.892101] task: ffff8801d90ab000 task.stack: ffff8801c9a68000 [ 53.898130] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1570 [ 53.907198] RSP: 0018:ffff8801c9a6f930 EFLAGS: 00010206 [ 53.912619] RAX: dffffc0000000000 RBX: ffff8801d8f88000 RCX: 1ffff1003a3bf0ab [ 53.919871] RDX: 000000000000000c RSI: ffffffff832d3106 RDI: 0000000000000060 [ 53.927117] RBP: ffff8801c9a6f970 R08: ffffffff85362570 R09: 0000000000000001 [ 53.934364] R10: 0000000000000000 R11: ffff8801d90ab000 R12: ffff8801d1df8500 [ 53.941609] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d1df8558 [ 53.949377] FS: 000000000135d880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 53.957585] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.963442] CR2: 0000000020000340 CR3: 00000001cb3a5000 CR4: 00000000001606f0 [ 53.970701] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.977947] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.985188] Stack: [ 53.987310] ffff8801d8f88088 ffff880100000001 ffff8801d8f88088 ffff8801d8f88000 [ 53.995315] ffff8801d1df8500 dffffc0000000000 ffff8801d1df8558 0000000000000000 [ 54.003315] ffff8801c9a6f9e0 ffffffff82f2b80b ffff8801d8f88430 ffff8801d8f88188 [ 54.011304] Call Trace: [ 54.013869] [] release_sock+0x17b/0x500 [ 54.019469] [] udp_sendmsg+0x1152/0x1c70 [ 54.025163] [] ? udp_push_pending_frames+0xe0/0xe0 [ 54.031718] [] ? udp4_lib_lookup+0x60/0x60 [ 54.037589] [] ? debug_check_no_locks_freed+0x210/0x210 [ 54.044577] [] ? sock_has_perm+0x1c1/0x400 [ 54.050432] [] ? sock_has_perm+0x29f/0x400 [ 54.056301] [] ? sock_has_perm+0x9f/0x400 [ 54.062072] [] ? inet_sendmsg+0x143/0x4d0 [ 54.067840] [] inet_sendmsg+0x203/0x4d0 [ 54.073437] [] ? inet_sendmsg+0x73/0x4d0 [ 54.079125] [] ? inet_recvmsg+0x4c0/0x4c0 [ 54.084898] [] sock_sendmsg+0xcc/0x110 [ 54.090412] [] SYSC_sendto+0x21c/0x370 [ 54.095928] [] ? SYSC_connect+0x300/0x300 [ 54.101706] [] ? __lock_acquire+0xa86/0x5270 [ 54.107738] [] ? udp_v4_get_port+0x139/0x180 [ 54.113773] [] ? debug_check_no_locks_freed+0x210/0x210 [ 54.120772] [] ? SYSC_bind+0x1da/0x280 [ 54.126286] [] ? SyS_dup2+0x3c5/0x5e0 [ 54.131803] [] SyS_sendto+0x40/0x50 [ 54.137054] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 54.143606] Code: 74 24 58 41 f6 c6 01 0f 85 a6 07 00 00 e8 aa e3 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 [ 54.170339] RIP [] udp_queue_rcv_skb+0x18f/0x1570 [ 54.176940] RSP [ 54.180583] ---[ end trace e735072f1bd12d15 ]--- [ 54.185326] Kernel panic - not syncing: Fatal exception in interrupt [ 54.192186] Dumping ftrace buffer: [ 54.195700] (ftrace buffer empty) [ 54.199423] Kernel Offset: disabled [ 54.203024] Rebooting in 86400 seconds..