[....] 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[ 21.486634] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.755395] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 22.078438] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.181989] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. executing program [ 28.905204] kasan: CONFIG_KASAN_INLINE enabled [ 28.909634] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.922509] Dumping ftrace buffer: [ 28.926016] (ftrace buffer empty) [ 28.929715] Modules linked in: [ 28.932996] CPU: 0 PID: 3756 Comm: syz-executor861 Not tainted 4.4.131-g834913c #31 [ 28.940755] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.950080] task: ffff8801cc3f9800 task.stack: ffff8800afe98000 [ 28.956107] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 28.965210] RSP: 0018:ffff8800afe9f6d0 EFLAGS: 00010206 [ 28.970629] RAX: dffffc0000000000 RBX: ffff8800afdb8000 RCX: 0000000000000000 [ 28.977875] RDX: 000000000000000c RSI: ffffffff83496cc6 RDI: 0000000000000060 [ 28.985118] RBP: ffff8800afe9f710 R08: 0000000000000001 R09: 0000000000000001 [ 28.992363] R10: 0000000000000000 R11: ffff8801cc3f9800 R12: ffff8800b46c2500 [ 28.999605] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b46c2558 [ 29.006855] FS: 0000000000d8c880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.015054] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.020913] CR2: 00000000205dafe4 CR3: 00000000b206e000 CR4: 00000000001606f0 [ 29.028154] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.035395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.042636] Stack: [ 29.044753] 00000001afdb8088 ffff8800b46c2500 ffff8800afdb8088 ffff8800afdb8000 [ 29.052728] ffff8800b46c2500 dffffc0000000000 ffff8800b46c2558 0000000000000000 [ 29.060784] ffff8800afe9f780 ffffffff82f2a20b ffff8800afdb8430 ffff8800afdb8188 [ 29.068767] Call Trace: [ 29.071326] [] release_sock+0x17b/0x500 [ 29.076923] [] udpv6_sendmsg+0x917/0x24c0 [ 29.082696] [] ? __udpv6_queue_rcv_skb+0x480/0x480 [ 29.089247] [] ? udp6_lib_lookup2+0x990/0x990 [ 29.095368] [] ? debug_check_no_locks_freed+0x210/0x210 [ 29.102351] [] ? sock_has_perm+0x1c1/0x400 [ 29.108206] [] ? sock_has_perm+0x29f/0x400 [ 29.114075] [] ? sock_has_perm+0x9f/0x400 [ 29.119848] [] ? inet_sendmsg+0x143/0x4d0 [ 29.125618] [] inet_sendmsg+0x203/0x4d0 [ 29.131211] [] ? inet_sendmsg+0x73/0x4d0 [ 29.136889] [] ? inet_recvmsg+0x4c0/0x4c0 [ 29.142657] [] sock_sendmsg+0xcc/0x110 [ 29.148161] [] sock_write_iter+0x223/0x3b0 [ 29.154016] [] ? sock_sendmsg+0x110/0x110 [ 29.159786] [] ? rw_copy_check_uvector+0x280/0x330 [ 29.166334] [] do_iter_readv_writev+0x13c/0x1e0 [ 29.172625] [] ? sock_sendmsg+0x110/0x110 [ 29.178390] [] ? vfs_iter_read+0x270/0x270 [ 29.184249] [] ? rw_verify_area+0x100/0x300 [ 29.190193] [] ? sock_sendmsg+0x110/0x110 [ 29.195958] [] do_readv_writev+0x2e0/0x6e0 [ 29.201810] [] ? vfs_write+0x4e0/0x4e0 [ 29.207319] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.213262] [] ? do_huge_pmd_anonymous_page+0x38c/0x9d0 [ 29.220268] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 29.226989] [] ? __fget_light+0x9f/0x1f0 [ 29.232668] [] ? __fdget+0x18/0x20 [ 29.237829] [] ? __sys_sendmsg+0xee/0x190 [ 29.243600] [] ? SyS_shutdown+0x1b0/0x1b0 [ 29.249368] [] vfs_writev+0x7b/0xb0 [ 29.254614] [] SyS_writev+0xd9/0x250 [ 29.259948] [] ? SyS_readv+0x250/0x250 [ 29.265454] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.271919] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.278466] Code: 74 24 58 41 f6 c6 01 0f 85 e2 07 00 00 e8 1a a5 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 [ 29.305153] RIP [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 29.311912] RSP [ 29.315554] ---[ end trace 4853e40aafc5e32d ]--- [ 29.320314] Kernel panic - not syncing: Fatal exception in interrupt [ 29.327278] Dumping ftrace buffer: [ 29.330789] (ftrace buffer empty) [ 29.334472] Kernel Offset: disabled [ 29.338068] Rebooting in 86400 seconds..