[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.209880] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.250774] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.580334] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.903371] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 24.063318] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 24.510725] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.622711] hrtimer: interrupt took 39684 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.847687] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 35.856039] IP: [] l2tp_session_create+0x948/0x1030 [ 35.862778] PGD 1cf24e067 PUD 1d02f8067 PMD 0 [ 35.867722] Oops: 0002 [#1] PREEMPT SMP KASAN [ 35.872683] Dumping ftrace buffer: [ 35.876229] (ftrace buffer empty) [ 35.879915] Modules linked in: [ 35.883210] CPU: 0 PID: 6355 Comm: syz-executor352 Not tainted 4.4.140-ged9bdc8 #68 [ 35.890983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.900312] task: ffff8801d87e9800 task.stack: ffff8801d8a28000 [ 35.906362] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 35.915506] RSP: 0018:ffff8801d8a2fb48 EFLAGS: 00010246 [ 35.920927] RAX: 0000000000000000 RBX: ffff8801d492db80 RCX: 0000000000000000 [ 35.928183] RDX: 1ffff1003a925ba0 RSI: ffffffff8359abe3 RDI: ffff8801d492dd00 [ 35.935430] RBP: ffff8801d8a2fbb8 R08: ffff8801d87ea100 R09: 0000000000000000 [ 35.942681] R10: 0000000000000000 R11: ffffffff84638de0 R12: ffff8801cddad228 [ 35.950038] R13: ffff8801d8a2fcd0 R14: ffff8801cddad180 R15: ffffffff8359a6c0 [ 35.957284] FS: 00007f497b300700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.965482] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.971339] CR2: 0000000000000080 CR3: 00000001d11ec000 CR4: 00000000001606f0 [ 35.978587] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.985831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.993078] Stack: [ 35.995210] ffffffff8113da8a ffff8801d492dba0 ffff8801cddad2d8 ffff8801cddad190 [ 36.003211] ffffffff838c2100 ffff8801cddad230 ffff8801cddad2d0 ffff8801d492dc60 [ 36.011204] ffffffff00000000 ffff8801d0049100 0000000000000000 ffff8801d0049130 [ 36.019206] Call Trace: [ 36.021786] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 36.028078] [] ? _raw_read_unlock_bh+0x30/0x40 [ 36.034294] [] pppol2tp_connect+0x10f0/0x1910 [ 36.040420] [] ? pppol2tp_recv+0x320/0x320 [ 36.046294] [] ? security_socket_connect+0x8f/0xc0 [ 36.052853] [] SYSC_connect+0x1b8/0x300 [ 36.058537] [] ? SYSC_bind+0x280/0x280 [ 36.064051] [] ? __do_page_fault+0x385/0xa10 [ 36.070203] [] ? retint_user+0x18/0x3c [ 36.075729] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.082544] [] SyS_connect+0x24/0x30 [ 36.087880] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.095558] 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 91 13 [ 36.122450] RIP [] l2tp_session_create+0x948/0x1030 [ 36.129228] RSP [ 36.132825] CR2: 0000000000000080 [ 36.137131] ---[ end trace 03f7e67a46c86304 ]--- [ 36.142245] Kernel panic - not syncing: Fatal exception [ 36.148043] Dumping ftrace buffer: [ 36.151570] (ftrace buffer empty) [ 36.155254] Kernel Offset: disabled [ 36.158862] Rebooting in 86400 seconds..