[....] 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[   20.343320] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.
[   21.115878] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)

Debian GNU/Linux 7 syzkaller ttyS0

[   21.559519] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
syzkaller login: [   22.552152] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts.
2018/06/07 17:57:54 parsed 1 programs
2018/06/07 17:57:56 executed programs: 0
[   37.991674] IPVS: Creating netns size=2552 id=1
[   38.210596] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   38.225041] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   38.299845] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   38.314292] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   38.387440] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   38.401207] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   38.416285] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   38.431818] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   39.072578] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   39.110312] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   40.322216] ==================================================================
[   40.329590] BUG: KASAN: use-after-free in tcp_write_xmit+0x3fc2/0x4cb0
[   40.336224] Read of size 2 at addr ffff8800ba98f1b0 by task syz-executor0/4209
[   40.343547] 
[   40.345144] CPU: 0 PID: 4209 Comm: syz-executor0 Not tainted 4.4.136-gfb7e319 #57
[   40.352729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   40.362051]  0000000000000000 bead00a411c184e7 ffff8801d6fe76c8 ffffffff81e0edad
[   40.370015]  ffffea0002ea6380 ffff8800ba98f1b0 0000000000000000 ffff8800ba98f1b0
[   40.377987]  dffffc0000000000 ffff8801d6fe7700 ffffffff815159b6 ffff8800ba98f1b0
[   40.385955] Call Trace:
[   40.388523]  [<ffffffff81e0edad>] dump_stack+0xc1/0x124
[   40.393854]  [<ffffffff815159b6>] print_address_description+0x6c/0x216
[   40.400487]  [<ffffffff81515cd5>] kasan_report.cold.7+0x175/0x2f7
[   40.406686]  [<ffffffff83286582>] ? tcp_write_xmit+0x3fc2/0x4cb0
[   40.412801]  [<ffffffff814f9784>] __asan_report_load2_noabort+0x14/0x20
[   40.419520]  [<ffffffff83286582>] tcp_write_xmit+0x3fc2/0x4cb0
[   40.425460]  [<ffffffff8327e68d>] ? tcp_current_mss+0x1fd/0x350
[   40.431487]  [<ffffffff8327e490>] ? tcp_mtup_init+0x340/0x340
[   40.437340]  [<ffffffff8122e4c7>] ? mark_held_locks+0xc7/0x130
[   40.443281]  [<ffffffff83287a40>] __tcp_push_pending_frames+0xa0/0x290
[   40.449916]  [<ffffffff8328e966>] tcp_send_fin+0x176/0xab0
[   40.455507]  [<ffffffff8323b915>] ? tcp_set_state+0x165/0x3f0
[   40.461359]  [<ffffffff8324c0d0>] tcp_close+0xca0/0xf70
[   40.466691]  [<ffffffff83316253>] ? ip_mc_drop_socket+0x1d3/0x230
[   40.472890]  [<ffffffff82f1a280>] ? sock_release+0x1c0/0x1c0
[   40.478656]  [<ffffffff832f8d0f>] inet_release+0xff/0x1d0
[   40.484160]  [<ffffffff82f1a156>] sock_release+0x96/0x1c0
[   40.489663]  [<ffffffff82f1a296>] sock_close+0x16/0x20
[   40.494909]  [<ffffffff81522da5>] __fput+0x235/0x6f0
[   40.499978]  [<ffffffff815232e5>] ____fput+0x15/0x20
[   40.505049]  [<ffffffff8118bd7f>] task_work_run+0x10f/0x190
[   40.510725]  [<ffffffff81135285>] do_exit+0x9e5/0x26b0
[   40.515971]  [<ffffffff811348a0>] ? release_task.part.17+0x1200/0x1200
[   40.522607]  [<ffffffff81153e76>] ? recalc_sigpending+0x76/0xa0
[   40.528660]  [<ffffffff8113b1d1>] do_group_exit+0x111/0x330
[   40.534337]  [<ffffffff8115e5cc>] get_signal+0x4ec/0x14b0