[....] 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[ 19.503053] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.381221] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.663038] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.603974] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. executing program [ 31.418890] kasan: CONFIG_KASAN_INLINE enabled [ 31.423302] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.436144] Dumping ftrace buffer: [ 31.439652] (ftrace buffer empty) [ 31.443329] Modules linked in: [ 31.446609] CPU: 0 PID: 3752 Comm: syzkaller767832 Not tainted 4.4.125-g38f41ec #63 [ 31.454367] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.463691] task: ffff8800adb59800 task.stack: ffff8800b5cc8000 [ 31.469714] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 31.478636] RSP: 0018:ffff8800b5ccf928 EFLAGS: 00010206 [ 31.484051] RAX: dffffc0000000000 RBX: ffff8801c8748000 RCX: ffffffff831b0248 [ 31.491289] RDX: 000000000000000c RSI: ffff8800b05328c0 RDI: 0000000000000060 [ 31.498525] RBP: ffff8800b5ccf968 R08: 0000000000000001 R09: 0000000000000001 [ 31.505772] R10: 0000000000000000 R11: 1ffff10016b99ef6 R12: ffff8800b05328c0 [ 31.513008] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b0532918 [ 31.520246] FS: 00000000009ef880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.528437] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.534287] CR2: 0000000020df9ff0 CR3: 00000000b46f4000 CR4: 0000000000160670 [ 31.541527] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.548765] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.556003] Stack: [ 31.558121] ffff8801c8748088 ffff880100000001 ffff8801c8748088 dffffc0000000000 [ 31.566078] ffff8801c8748000 0000000000000000 ffffed00390e9086 ffff8800b05328c0 [ 31.574060] ffff8800b5ccf9d8 ffffffff82dfe8d6 ffff8801c8748188 ffff8801c8748190 [ 31.582017] Call Trace: [ 31.584581] [] release_sock+0x176/0x510 [ 31.590174] [] udp_sendmsg+0x15c4/0x1c30 [ 31.595857] [] ? save_stack+0x43/0xd0 [ 31.601276] [] ? udp_push_pending_frames+0xe0/0xe0 [ 31.607921] [] ? udp_seq_next+0x80/0x80 [ 31.613519] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 31.620506] [] ? sock_has_perm+0x1c1/0x400 [ 31.626361] [] ? sock_has_perm+0x29f/0x400 [ 31.632213] [] ? sock_has_perm+0x9f/0x400 [ 31.637979] [] ? inet_sendmsg+0x201/0x4c0 [ 31.643745] [] inet_sendmsg+0x2bc/0x4c0 [ 31.649346] [] ? inet_sendmsg+0x73/0x4c0 [ 31.655026] [] ? inet_recvmsg+0x4c0/0x4c0 [ 31.660805] [] sock_sendmsg+0xca/0x110 [ 31.666308] [] SYSC_sendto+0x2c8/0x340 [ 31.671812] [] ? SYSC_connect+0x310/0x310 [ 31.677583] [] ? _raw_spin_unlock+0x2c/0x50 [ 31.683529] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 31.690516] [] ? handle_mm_fault+0x3f2/0x3190 [ 31.696633] [] ? SYSC_bind+0x1ad/0x280 [ 31.702139] [] ? __do_page_fault+0x380/0xa00 [ 31.708167] [] ? retint_user+0x18/0x3c [ 31.713760] [] SyS_sendto+0x40/0x50 [ 31.719006] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.725549] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 38 14 1b 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 9f 0b 00 00 41 f6 46 60 04 [ 31.752090] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 31.758667] RSP [ 31.762313] ---[ end trace 5188c8b77a63b6d3 ]--- [ 31.767070] Kernel panic - not syncing: Fatal exception in interrupt [ 31.773956] Dumping ftrace buffer: [ 31.777471] (ftrace buffer empty) [ 31.781152] Kernel Offset: disabled [ 31.784748] Rebooting in 86400 seconds..