[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.531315] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.910912] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.298681] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.216371] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 35.019114] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. executing program executing program [ 63.225125] kasan: CONFIG_KASAN_INLINE enabled [ 63.229550] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 63.242431] Dumping ftrace buffer: [ 63.246028] (ftrace buffer empty) [ 63.249707] Modules linked in: [ 63.253478] CPU: 1 PID: 3811 Comm: syzkaller751192 Not tainted 4.4.115-g037d237 #8 [ 63.261169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.270493] task: ffff8800bb1d9800 task.stack: ffff8800a9d70000 [ 63.276515] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 63.285533] RSP: 0018:ffff8800a9d77928 EFLAGS: 00010206 [ 63.290950] RAX: dffffc0000000000 RBX: ffff8801d99b85c0 RCX: ffffffff831a9558 [ 63.298189] RDX: 000000000000000c RSI: ffff8801c8528a00 RDI: 0000000000000060 [ 63.305436] RBP: ffff8800a9d77968 R08: 0000000000000000 R09: 0000000000000001 [ 63.312682] R10: 0000000000000000 R11: 1ffff100153aeef6 R12: ffff8801c8528a00 [ 63.319919] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801c8528a58 [ 63.327155] FS: 000000000106c880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 63.335345] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.341195] CR2: 000000002082dff0 CR3: 00000000aa5a8000 CR4: 0000000000160670 [ 63.348434] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.355680] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.362922] Stack: [ 63.365038] ffff8801d99b8648 ffff880100000001 ffff8801d99b8648 dffffc0000000000 [ 63.373004] ffff8801d99b85c0 0000000000000000 ffffed003b33713e ffff8801c8528a00 [ 63.380966] ffff8800a9d779d8 ffffffff82df8b16 ffff8801d99b8748 ffff8801d99b8750 [ 63.388922] Call Trace: [ 63.391477] [] release_sock+0x176/0x510 [ 63.397066] [] udp_sendmsg+0x15c4/0x1c30 [ 63.402756] [] ? avc_has_perm_noaudit+0x460/0x460 [ 63.409215] [] ? udp_push_pending_frames+0xe0/0xe0 [ 63.415763] [] ? udp_seq_next+0x80/0x80 [ 63.421354] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 63.428333] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 63.435319] [] ? sock_has_perm+0x1c1/0x400 [ 63.441172] [] ? sock_has_perm+0x29f/0x400 [ 63.447021] [] ? sock_has_perm+0x9f/0x400 [ 63.452792] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 63.459863] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 63.466841] [] ? inet_sendmsg+0x73/0x4c0 [ 63.472516] [] ? inet_sendmsg+0x201/0x4c0 [ 63.478280] [] inet_sendmsg+0x2bc/0x4c0 [ 63.483868] [] ? inet_sendmsg+0x73/0x4c0 [ 63.489545] [] ? inet_recvmsg+0x4c0/0x4c0 [ 63.495308] [] sock_sendmsg+0xca/0x110 [ 63.500817] [] SYSC_sendto+0x2c8/0x340 [ 63.506320] [] ? SYSC_connect+0x310/0x310 [ 63.512087] [] ? _raw_spin_unlock+0x2c/0x50 [ 63.518114] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 63.525096] [] ? handle_mm_fault+0x3f2/0x3190 [ 63.531219] [] ? SYSC_bind+0x1ad/0x280 [ 63.536728] [] ? __do_page_fault+0x290/0xa00 [ 63.542752] [] ? __do_page_fault+0x380/0xa00 [ 63.548798] [] ? up_read+0x1a/0x40 [ 63.554061] [] ? __do_page_fault+0x149/0xa00 [ 63.560088] [] ? move_addr_to_kernel+0x50/0x50 [ 63.566298] [] SyS_sendto+0x40/0x50 [ 63.571552] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 63.578095] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 28 78 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 [ 63.604703] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 63.611280] RSP [ 63.614909] ---[ end trace 826ec98b7cd69bca ]--- [ 63.619635] Kernel panic - not syncing: Fatal exception in interrupt [ 63.626465] Dumping ftrace buffer: [ 63.629974] (ftrace buffer empty) [ 63.633654] Kernel Offset: disabled [ 63.637260] Rebooting in 86400 seconds..