[....] Starting file context maintaining daemon:[ 18.436111] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.703299] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 19.957218] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.712396] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 20.875589] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. [ 26.261381] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program [ 27.042346] kasan: CONFIG_KASAN_INLINE enabled [ 27.046782] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.059609] Dumping ftrace buffer: [ 27.063119] (ftrace buffer empty) [ 27.066802] Modules linked in: [ 27.070090] CPU: 0 PID: 3987 Comm: syzkaller162463 Not tainted 4.4.116-g20ddb25 #15 [ 27.077851] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.087187] task: ffff8800ba6b9800 task.stack: ffff8800ba658000 [ 27.093221] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 27.102157] RSP: 0018:ffff8800ba65f928 EFLAGS: 00010206 [ 27.107573] RAX: dffffc0000000000 RBX: ffff8800b9ca0000 RCX: ffffffff831a9a18 [ 27.114813] RDX: 000000000000000c RSI: ffff8801ce109280 RDI: 0000000000000060 [ 27.122053] RBP: ffff8800ba65f968 R08: 0000000000000000 R09: 0000000000000001 [ 27.129312] R10: 0000000000000000 R11: 1ffff100174cbef6 R12: ffff8801ce109280 [ 27.136550] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801ce1092d8 [ 27.143791] FS: 0000000001326880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.151994] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.157846] CR2: 0000000020df9ff0 CR3: 00000000aabda000 CR4: 0000000000160670 [ 27.165089] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.172338] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.179588] Stack: [ 27.181707] ffff8800b9ca0088 ffff880000000001 ffff8800b9ca0088 dffffc0000000000 [ 27.189693] ffff8800b9ca0000 0000000000000000 ffffed0017394086 ffff8801ce109280 [ 27.197683] ffff8800ba65f9d8 ffffffff82df8d96 ffff8800b9ca0188 ffff8800b9ca0190 [ 27.205651] Call Trace: [ 27.208211] [] release_sock+0x176/0x510 [ 27.213806] [] udp_sendmsg+0x15c4/0x1c30 [ 27.219488] [] ? avc_has_perm_noaudit+0x460/0x460 [ 27.225953] [] ? udp_push_pending_frames+0xe0/0xe0 [ 27.232509] [] ? udp_seq_next+0x80/0x80 [ 27.238112] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.245103] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.252087] [] ? sock_has_perm+0x1c1/0x400 [ 27.257939] [] ? sock_has_perm+0x29f/0x400 [ 27.263791] [] ? sock_has_perm+0x9f/0x400 [ 27.269556] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.276624] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.283612] [] ? inet_sendmsg+0x73/0x4c0 [ 27.289297] [] ? inet_sendmsg+0x201/0x4c0 [ 27.295062] [] inet_sendmsg+0x2bc/0x4c0 [ 27.300653] [] ? inet_sendmsg+0x73/0x4c0 [ 27.306332] [] ? inet_recvmsg+0x4c0/0x4c0 [ 27.312112] [] sock_sendmsg+0xca/0x110 [ 27.317619] [] SYSC_sendto+0x2c8/0x340 [ 27.323128] [] ? SYSC_connect+0x310/0x310 [ 27.328896] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.334837] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.341823] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.347950] [] ? SYSC_bind+0x1ad/0x280 [ 27.353457] [] ? __do_page_fault+0x290/0xa00 [ 27.359496] [] ? __do_page_fault+0x380/0xa00 [ 27.365533] [] ? up_read+0x1a/0x40 [ 27.370691] [] ? __do_page_fault+0x149/0xa00 [ 27.376719] [] ? move_addr_to_kernel+0x50/0x50 [ 27.382928] [] SyS_sendto+0x40/0x50 [ 27.388177] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.394721] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 48 73 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 [ 27.421319] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 27.427910] RSP [ 27.431544] ---[ end trace c49f9c8033a39be6 ]--- [ 27.436285] Kernel panic - not syncing: Fatal exception in interrupt [ 27.443227] Dumping ftrace buffer: [ 27.446746] (ftrace buffer empty) [ 27.450424] Kernel Offset: disabled [ 27.454017] Rebooting in 86400 seconds..