[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.705178] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.862506] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   26.141053] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   27.125485] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available)
[   27.284147] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available)
Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts.
[   32.756598] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available)
executing program
[   32.846107] kasan: CONFIG_KASAN_INLINE enabled
[   32.850527] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
[   32.863355] Dumping ftrace buffer:
[   32.866874]    (ftrace buffer empty)
[   32.870553] Modules linked in:
[   32.873832] CPU: 0 PID: 3838 Comm: syz-executor838 Not tainted 4.4.131-g4fca5a0 #33
[   32.881591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.890918] task: ffff8801ca1a3000 task.stack: ffff8801d95c8000
[   32.896943] RIP: 0010:[<ffffffff832d0e3f>]  [<ffffffff832d0e3f>] udp_queue_rcv_skb+0x18f/0x1570
[   32.905871] RSP: 0018:ffff8801d95cf930  EFLAGS: 00010206
[   32.911288] RAX: dffffc0000000000 RBX: ffff8801d95f8000 RCX: 1ffff1003a450923
[   32.918529] RDX: 000000000000000c RSI: ffffffff832d0e26 RDI: 0000000000000060
[   32.925772] RBP: ffff8801d95cf970 R08: ffffffff85362570 R09: 0000000000000001
[   32.933011] R10: 0000000000000000 R11: ffff8801ca1a3000 R12: ffff8801d22848c0
[   32.940250] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d2284918
[   32.947492] FS:  0000000001496880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   32.955688] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.961537] CR2: 0000000020b9aff0 CR3: 00000001d959d000 CR4: 00000000001606f0
[   32.968785] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.976026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.983265] Stack:
[   32.985385]  ffff8801d95f8088 ffff880100000001 ffff8801d95f8088 ffff8801d95f8000
[   32.993368]  ffff8801d22848c0 dffffc0000000000 ffff8801d2284918 0000000000000000
[   33.001343]  ffff8801d95cf9e0 ffffffff82f2a1eb ffff8801d95f8430 ffff8801d95f8188
[   33.009320] Call Trace:
[   33.011901]  [<ffffffff82f2a1eb>] release_sock+0x17b/0x500
[   33.017495]  [<ffffffff832cec80>] udp_sendmsg+0x12b0/0x1bb0
[   33.023178]  [<ffffffff832c6c60>] ? udp_push_pending_frames+0xe0/0xe0
[   33.029731]  [<ffffffff832cd9d0>] ? udp4_lib_lookup+0x60/0x60
[   33.035588]  [<ffffffff8122ee10>] ? debug_check_no_locks_freed+0x210/0x210
[   33.042573]  [<ffffffff81c6ea81>] ? sock_has_perm+0x1c1/0x400
[   33.048431]  [<ffffffff81c6eb5f>] ? sock_has_perm+0x29f/0x400
[   33.054287]  [<ffffffff81c6e95f>] ? sock_has_perm+0x9f/0x400
[   33.060057]  [<ffffffff832feb33>] ? inet_sendmsg+0x143/0x4d0
[   33.065825]  [<ffffffff832febf3>] inet_sendmsg+0x203/0x4d0
[   33.071418]  [<ffffffff832fea63>] ? inet_sendmsg+0x73/0x4d0
[   33.077098]  [<ffffffff832fe9f0>] ? inet_recvmsg+0x4c0/0x4c0
[   33.082867]  [<ffffffff82f1cd0c>] sock_sendmsg+0xcc/0x110
[   33.088382]  [<ffffffff82f1d9ec>] SYSC_sendto+0x21c/0x370
[   33.093889]  [<ffffffff82f1d7d0>] ? SYSC_connect+0x300/0x300
[   33.099655]  [<ffffffff832cc029>] ? udp_v4_get_port+0x139/0x180
[   33.105682]  [<ffffffff832f6b8e>] ? inet_bind+0xae/0x8a0
[   33.111110]  [<ffffffff82f1d42a>] ? SYSC_bind+0x1da/0x280
[   33.116621]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   33.122656]  [<ffffffff838c09d8>] ? retint_user+0x18/0x3c
[   33.128162]  [<ffffffff82f20070>] SyS_sendto+0x40/0x50
[   33.133410]  [<ffffffff838bfe25>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   33.139956] Code: 74 24 58 41 f6 c6 01 0f 85 a6 07 00 00 e8 ba 03 08 fe 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 25 0e 00 00 41 f6 46 60 04 
[   33.166606] RIP  [<ffffffff832d0e3f>] udp_queue_rcv_skb+0x18f/0x1570
[   33.173186]  RSP <ffff8801d95cf930>
[   33.176838] ---[ end trace e65237cac912788d ]---
[   33.181575] Kernel panic - not syncing: Fatal exception in interrupt
[   33.188617] Dumping ftrace buffer:
[   33.192134]    (ftrace buffer empty)
[   33.195822] Kernel Offset: disabled
[   33.199421] Rebooting in 86400 seconds..