[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.769838] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.013704] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.444363] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.148802] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 93.088643] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 98.576182] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) 2018/08/21 07:35:41 parsed 1 programs [ 99.923853] random: cc1: uninitialized urandom read (8 bytes read, 102 bits of entropy available) 2018/08/21 07:35:43 executed programs: 0 [ 101.756184] IPVS: Creating netns size=2552 id=1 [ 101.817176] IPVS: Creating netns size=2552 id=2 [ 101.869807] IPVS: Creating netns size=2552 id=3 [ 101.922814] IPVS: Creating netns size=2552 id=4 [ 101.992558] IPVS: Creating netns size=2552 id=5 [ 102.117339] IPVS: Creating netns size=2552 id=6 [ 102.200684] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 102.237984] IPVS: Creating netns size=2552 id=7 [ 102.243910] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 102.408317] IPVS: Creating netns size=2552 id=8 [ 102.449108] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 102.462459] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 102.482658] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 102.510672] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 102.606303] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 102.648028] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 102.902245] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 102.976774] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 103.016841] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 103.096870] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 103.116661] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 103.208914] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 103.238342] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 103.249181] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 103.328060] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 103.345424] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 103.443386] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 103.507189] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 103.587375] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 103.614651] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 103.674616] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 103.748131] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 103.757486] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 103.769290] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 103.778163] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 103.821793] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 103.830131] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 103.910860] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 104.006484] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 104.084677] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 104.094421] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 104.111224] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 104.184546] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 104.228561] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 104.304710] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 104.320945] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 104.393887] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 104.459399] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 104.518019] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 104.525974] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 104.540678] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 104.584717] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 104.626877] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 104.699860] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 104.718355] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 104.834512] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 104.846520] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 104.894170] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 104.990315] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 105.071345] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 105.094602] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 105.129351] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 105.142008] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 105.205511] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 105.213916] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 105.264802] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 105.298274] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 105.335072] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 105.355142] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 105.394622] ip (4663) used greatest stack depth: 23696 bytes left [ 105.412058] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 105.551305] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 105.613822] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 108.543897] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 108.856959] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 109.011526] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 109.054667] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 109.258083] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 109.337248] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 109.748418] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 109.951022] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.033244] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 110.214788] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 110.432779] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.541386] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.621103] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.744492] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 110.773122] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/08/21 07:35:52 executed programs: 8 [ 110.893209] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 112.406507] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 112.414791] IP: [] l2tp_session_create+0x948/0x1030 [ 112.421504] PGD b15d2067 PUD b1c72067 PMD 0 [ 112.426295] Oops: 0002 [#1] PREEMPT SMP KASAN [ 112.431310] Dumping ftrace buffer: [ 112.434840] (ftrace buffer empty) [ 112.438535] Modules linked in: [ 112.441826] CPU: 1 PID: 6674 Comm: syz-executor2 Not tainted 4.4.150-g5541782 #83 [ 112.449442] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 112.458781] task: ffff8801cedd3000 task.stack: ffff8800b5bf0000 [ 112.464811] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 112.473932] RSP: 0018:ffff8800b5bf7b48 EFLAGS: 00010246 [ 112.479357] RAX: 0000000000000000 RBX: ffff8801cef8c500 RCX: 0000000000000000 [ 112.486605] RDX: 1ffff10039df18d0 RSI: ffffffff835a3493 RDI: ffff8801cef8c680 [ 112.493852] RBP: ffff8800b5bf7bb8 R08: ffff8801cedd3900 R09: 0000000000000000 [ 112.501100] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801cef8cd28 [ 112.508351] R13: ffff8800b5bf7cd0 R14: ffff8801cef8cc80 R15: ffffffff835a2f70 [ 112.515609] FS: 00007f047c6f6700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 112.523839] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 112.529709] CR2: 0000000000000080 CR3: 00000000b667c000 CR4: 00000000001606f0 [ 112.536967] Stack: [ 112.539107] ffffffff8114094a ffff8801cef8c520 ffff8801cef8cdd8 ffff8801cef8cc90 [ 112.547100] ffffffff838caa10 ffff8801cef8cd30 ffff8801cef8cdd0 ffff8801cef8c5e0 [ 112.555151] ffffffff00000000 ffff8801d3d0b300 0000000000000000 ffff8801d3d0b330 [ 112.563160] Call Trace: [ 112.565726] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 112.572027] [] ? _raw_read_unlock_bh+0x30/0x40 [ 112.578237] [] pppol2tp_connect+0x10f0/0x1910 [ 112.584360] [] ? pppol2tp_recv+0x320/0x320 [ 112.590224] [] ? security_socket_connect+0x8f/0xc0 [ 112.596781] [] SYSC_connect+0x1b8/0x300 [ 112.602380] [] ? SYSC_bind+0x280/0x280 [ 112.607895] [] ? get_unused_fd_flags+0xd0/0xd0 [ 112.614272] [] ? do_futex+0x17f0/0x17f0 [ 112.619874] [] ? SyS_socket+0x121/0x1b0 [ 112.625504] [] ? move_addr_to_kernel+0x50/0x50 [ 112.631711] [] SyS_connect+0x24/0x30 [ 112.637053] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 112.643601] Code: 00 00 48 8d bb 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 112.670457] RIP [] l2tp_session_create+0x948/0x1030 [ 112.677221] RSP [ 112.680826] CR2: 0000000000000080 [ 112.687320] ---[ end trace 7ea9efea2026810b ]--- [ 112.698159] Kernel panic - not syncing: Fatal exception [ 112.703823] Dumping ftrace buffer: [ 112.707347] (ftrace buffer empty) [ 112.711031] Kernel Offset: disabled [ 112.714631] Rebooting in 86400 seconds..