[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.085845] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.151984] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.427893] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.449648] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 26.557414] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. executing program [ 32.124368] kasan: CONFIG_KASAN_INLINE enabled [ 32.128784] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.141601] Dumping ftrace buffer: [ 32.145112] (ftrace buffer empty) [ 32.148796] Modules linked in: [ 32.152072] CPU: 1 PID: 3782 Comm: syzkaller491496 Not tainted 4.4.119-g855ea74 #27 [ 32.159836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.169161] task: ffff8800bb9de000 task.stack: ffff8800bb300000 [ 32.175190] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x191/0x1510 [ 32.184295] RSP: 0018:ffff8800bb307648 EFLAGS: 00010206 [ 32.189709] RAX: dffffc0000000000 RBX: ffff8801d8c68000 RCX: ffffffff83373978 [ 32.196947] RDX: 000000000000000c RSI: ffff8800b0fbdb40 RDI: 0000000000000060 [ 32.204186] RBP: ffff8800bb307688 R08: 0000000000000001 R09: 0000000000000001 [ 32.211423] R10: 0000000000000000 R11: 1ffff10017660e9a R12: ffff8800b0fbdb40 [ 32.218662] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b0fbdb98 [ 32.225907] FS: 00000000006f4880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.234101] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.239949] CR2: 0000000020685ff0 CR3: 00000001cc104000 CR4: 0000000000160670 [ 32.247189] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.254432] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.261670] Stack: [ 32.263790] 00000001d8c68088 ffff8801d8c68000 ffff8801d8c68088 dffffc0000000000 [ 32.271764] ffff8801d8c68000 0000000000000000 ffffed003b18d086 ffff8800b0fbdb40 [ 32.279727] ffff8800bb3076f8 ffffffff82df8ad6 ffff8801d8c68188 ffff8801d8c68190 [ 32.287692] Call Trace: [ 32.290249] [] release_sock+0x176/0x510 [ 32.295843] [] udp_sendmsg+0x15c4/0x1c30 [ 32.301522] [] ? udp_push_pending_frames+0xe0/0xe0 [ 32.308069] [] ? udp_seq_next+0x80/0x80 [ 32.313667] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 32.320648] [] ? avc_has_perm+0x296/0x500 [ 32.326411] [] ? __lock_acquire+0xb5f/0x4b50 [ 32.332441] [] udpv6_sendmsg+0x1434/0x2500 [ 32.338291] [] ? avc_has_perm+0x296/0x500 [ 32.344055] [] ? udp6_lib_lookup+0x60/0x60 [ 32.349907] [] ? avc_has_perm_noaudit+0x460/0x460 [ 32.356365] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 32.363348] [] ? sock_has_perm+0x1c1/0x400 [ 32.369211] [] ? sock_has_perm+0x29f/0x400 [ 32.375062] [] ? sock_has_perm+0x9f/0x400 [ 32.380829] [] ? inet_sendmsg+0x201/0x4c0 [ 32.386593] [] inet_sendmsg+0x2bc/0x4c0 [ 32.392185] [] ? inet_sendmsg+0x73/0x4c0 [ 32.397860] [] ? inet_recvmsg+0x4c0/0x4c0 [ 32.403627] [] sock_sendmsg+0xca/0x110 [ 32.409133] [] SYSC_sendto+0x2c8/0x340 [ 32.414635] [] ? SYSC_connect+0x310/0x310 [ 32.420398] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.426339] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 32.433323] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 32.440042] [] ? __fget_light+0xa3/0x1e0 [ 32.445720] [] ? __fdget+0x18/0x20 [ 32.450879] [] ? __do_page_fault+0x380/0xa00 [ 32.456905] [] SyS_sendto+0x40/0x50 [ 32.462150] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 32.468693] Code: 74 24 58 41 f6 c6 01 0f 85 b7 07 00 00 e8 98 d3 fe fd 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 7c 0b 00 00 41 f6 46 60 04 [ 32.495270] RIP [] udpv6_queue_rcv_skb+0x191/0x1510 [ 32.502020] RSP [ 32.505644] ---[ end trace ce9001b7a40faa26 ]--- [ 32.510380] Kernel panic - not syncing: Fatal exception in interrupt [ 32.517238] Dumping ftrace buffer: [ 32.520745] (ftrace buffer empty) [ 32.524422] Kernel Offset: disabled [ 32.528014] Rebooting in 86400 seconds..