[....] 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[ 22.176766] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.235756] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.561264] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.592652] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. executing program executing program [ 30.477708] device lo entered promiscuous mode [ 30.494297] kasan: CONFIG_KASAN_INLINE enabled [ 30.498713] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.511583] Dumping ftrace buffer: [ 30.515093] (ftrace buffer empty) [ 30.518774] Modules linked in: [ 30.522057] CPU: 0 PID: 3846 Comm: syzkaller757896 Not tainted 4.4.128-gbd23e3a #20 [ 30.529818] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.539149] task: ffff8801d8d74800 task.stack: ffff8801c6f70000 [ 30.545176] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1570 [ 30.554115] RSP: 0018:ffff8801c6f77930 EFLAGS: 00010206 [ 30.559535] RAX: dffffc0000000000 RBX: ffff8801c6f98000 RCX: 1ffff100396ea25b [ 30.566778] RDX: 000000000000000c RSI: ffffffff832cf9d6 RDI: 0000000000000060 [ 30.574019] RBP: ffff8801c6f77970 R08: ffffffff85362570 R09: 0000000000000001 [ 30.581276] R10: 0000000000000000 R11: ffff8801d8d74800 R12: ffff8801cb751280 [ 30.588521] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801cb7512d8 [ 30.595764] FS: 0000000001740880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.603959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.609810] CR2: 0000000020319ff0 CR3: 00000001cef88000 CR4: 0000000000160670 [ 30.617051] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.624291] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.631531] Stack: [ 30.633662] ffff8801c6f98088 ffff880100000001 ffff8801c6f98088 ffff8801c6f98000 [ 30.641648] ffff8801cb751280 dffffc0000000000 ffff8801cb7512d8 0000000000000000 [ 30.649644] ffff8801c6f779e0 ffffffff82f28f7b ffff8801c6f98430 ffff8801c6f98188 [ 30.657626] Call Trace: [ 30.660196] [] release_sock+0x17b/0x500 [ 30.665793] [] udp_sendmsg+0x12b0/0x1bb0 [ 30.671476] [] ? udp_push_pending_frames+0xe0/0xe0 [ 30.678026] [] ? udp4_lib_lookup+0x60/0x60 [ 30.683884] [] ? debug_check_no_locks_freed+0x210/0x210 [ 30.690894] [] ? sock_has_perm+0x1c1/0x400 [ 30.696761] [] ? sock_has_perm+0x29f/0x400 [ 30.702725] [] ? sock_has_perm+0x9f/0x400 [ 30.708503] [] ? inet_sendmsg+0x143/0x4d0 [ 30.714283] [] inet_sendmsg+0x203/0x4d0 [ 30.719882] [] ? inet_sendmsg+0x73/0x4d0 [ 30.725568] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.731346] [] sock_sendmsg+0xcc/0x110 [ 30.736854] [] SYSC_sendto+0x21c/0x370 [ 30.742364] [] ? SYSC_connect+0x300/0x300 [ 30.748138] [] ? _raw_spin_unlock+0x2c/0x50 [ 30.754083] [] ? do_huge_pmd_anonymous_page+0x38c/0x9d0 [ 30.761070] [] ? handle_mm_fault+0xbf7/0x2ff0 [ 30.767186] [] ? SYSC_bind+0x1da/0x280 [ 30.772705] [] ? __do_page_fault+0x385/0xa10 [ 30.778737] [] ? retint_user+0x18/0x3c [ 30.784247] [] SyS_sendto+0x40/0x50 [ 30.789495] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.796043] Code: 74 24 58 41 f6 c6 01 0f 85 a6 07 00 00 e8 ea 17 08 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 [ 30.822803] RIP [] udp_queue_rcv_skb+0x18f/0x1570 [ 30.829393] RSP [ 30.833033] ---[ end trace 9b4854a99fd95fff ]--- [ 30.837776] Kernel panic - not syncing: Fatal exception in interrupt [ 30.844711] Dumping ftrace buffer: [ 30.848223] (ftrace buffer empty) [ 30.851904] Kernel Offset: disabled [ 30.855894] Rebooting in 86400 seconds..