[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.734526] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 21.245116] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 21.686779] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.682261] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 22.844109] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 28.347581] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program [ 28.449460] kasan: CONFIG_KASAN_INLINE enabled [ 28.453898] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.466727] Dumping ftrace buffer: [ 28.470236] (ftrace buffer empty) [ 28.473917] Modules linked in: [ 28.477196] CPU: 0 PID: 3745 Comm: syz-executor841 Not tainted 4.4.129-g23eaecc #27 [ 28.484958] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.494282] task: ffff8801ccb68000 task.stack: ffff8801cc158000 [ 28.500306] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 28.509414] RSP: 0018:ffff8801cc15f7e0 EFLAGS: 00010206 [ 28.514831] RAX: dffffc0000000000 RBX: ffff8800b0bd8000 RCX: 0000000000000000 [ 28.522071] RDX: 000000000000000c RSI: ffffffff834961d6 RDI: 0000000000000060 [ 28.529312] RBP: ffff8801cc15f820 R08: 0000000000000001 R09: 0000000000000001 [ 28.536555] R10: 0000000000000000 R11: ffff8801ccb68000 R12: ffff8800b6440640 [ 28.543806] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b6440698 [ 28.551047] FS: 0000000002433880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.559251] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.565105] CR2: 00000000205dafe4 CR3: 00000000b0f51000 CR4: 00000000001606f0 [ 28.572346] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.579592] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.586832] Stack: [ 28.588949] 00000001b0bd8088 ffff8800b6440640 ffff8800b0bd8088 ffff8800b0bd8000 [ 28.596925] ffff8800b6440640 dffffc0000000000 ffff8800b6440698 0000000000000000 [ 28.604902] ffff8801cc15f890 ffffffff82f298fb ffff8800b0bd8430 ffff8800b0bd8188 [ 28.612880] Call Trace: [ 28.615442] [] release_sock+0x17b/0x500 [ 28.621044] [] udpv6_sendmsg+0x917/0x24c0 [ 28.626813] [] ? __udpv6_queue_rcv_skb+0x480/0x480 [ 28.633367] [] ? udp6_lib_lookup2+0x990/0x990 [ 28.639486] [] ? debug_check_no_locks_freed+0x210/0x210 [ 28.646474] [] ? sock_has_perm+0x1c1/0x400 [ 28.652331] [] ? sock_has_perm+0x29f/0x400 [ 28.658204] [] ? sock_has_perm+0x9f/0x400 [ 28.664062] [] ? inet_sendmsg+0x143/0x4d0 [ 28.669839] [] inet_sendmsg+0x203/0x4d0 [ 28.675434] [] ? inet_sendmsg+0x73/0x4d0 [ 28.681123] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.686892] [] sock_sendmsg+0xcc/0x110 [ 28.692399] [] sock_write_iter+0x223/0x3b0 [ 28.698252] [] ? sock_sendmsg+0x110/0x110 [ 28.704023] [] ? iov_iter_init+0xaf/0x1d0 [ 28.709795] [] __vfs_write+0x30d/0x3f0 [ 28.715313] [] ? __vfs_read+0x3e0/0x3e0 [ 28.720907] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 28.727631] [] ? __fget_light+0x9f/0x1f0 [ 28.733313] [] ? selinux_file_permission+0x2f2/0x450 [ 28.740045] [] ? rw_verify_area+0x100/0x300 [ 28.745988] [] vfs_write+0x191/0x4e0 [ 28.751324] [] SyS_write+0xd9/0x1c0 [ 28.756572] [] ? SyS_read+0x1c0/0x1c0 [ 28.761993] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.768884] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.775434] Code: 74 24 58 41 f6 c6 01 0f 85 e2 07 00 00 e8 0a b0 eb 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 c1 0d 00 00 41 f6 46 60 04 [ 28.802339] RIP [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 28.809098] RSP [ 28.812750] ---[ end trace dce1345242661755 ]--- [ 28.817514] Kernel panic - not syncing: Fatal exception in interrupt [ 28.824433] Dumping ftrace buffer: [ 28.827950] (ftrace buffer empty) [ 28.831636] Kernel Offset: disabled [ 28.835236] Rebooting in 86400 seconds..