[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.924052] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.342193] random: sshd: uninitialized urandom read (32 bytes read)
[   18.671431] random: sshd: uninitialized urandom read (32 bytes read)
[   19.354429] random: sshd: uninitialized urandom read (32 bytes read)
[   59.013530] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts.
[   64.466130] random: sshd: uninitialized urandom read (32 bytes read)
net.ipv6.conf.syz_tun.accept_dad = 0
net.ipv6.conf.syz_tun.router_solicitations = 0
[   64.549252] IPVS: ftp: loaded support on port[0] = 21
[   64.686878] bridge0: port 1(bridge_slave_0) entered blocking state
[   64.693264] bridge0: port 1(bridge_slave_0) entered disabled state
[   64.700130] device bridge_slave_0 entered promiscuous mode
[   64.713535] bridge0: port 2(bridge_slave_1) entered blocking state
[   64.719927] bridge0: port 2(bridge_slave_1) entered disabled state
[   64.726737] device bridge_slave_1 entered promiscuous mode
[   64.739341] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   64.753415] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   64.786089] bond0: Enslaving bond_slave_0 as an active interface with an up link
[   64.802533] bond0: Enslaving bond_slave_1 as an active interface with an up link
[   64.851614] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
[   64.858685] team0: Port device team_slave_0 added
[   64.870906] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
[   64.877937] team0: Port device team_slave_1 added
[   64.890292] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[   64.905272] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[   64.920608] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   64.934960] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
RTNETLINK answers: Operation not supported
RTNETLINK answers: No buffer space available
RTNETLINK answers: Operation not supported
RTNETLINK answers: Operation not supported
[   65.023258] bridge0: port 2(bridge_slave_1) entered blocking state
[   65.029653] bridge0: port 2(bridge_slave_1) entered forwarding state
[   65.036238] bridge0: port 1(bridge_slave_0) entered blocking state
[   65.042577] bridge0: port 1(bridge_slave_0) entered forwarding state
RTNETLINK answers: Operation not supported
RTNETLINK answers: Operation not supported
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
[   65.329034] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
[   65.335137] 8021q: adding VLAN 0 to HW filter on device bond0
[   65.365941] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   65.398332] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   65.405359] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[   65.432220] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
[   65.438332] 8021q: adding VLAN 0 to HW filter on device team0
executing program
[   65.623568] kasan: CONFIG_KASAN_INLINE enabled
[   65.628214] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   65.635619] general protection fault: 0000 [#1] SMP KASAN
[   65.641150] CPU: 1 PID: 4705 Comm: syz-executor133 Not tainted 4.18.0-rc3+ #47
[   65.648591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.657950] RIP: 0010:bpf_tcp_close+0x215/0x1050
[   65.662680] Code: 
[   65.662687] ------------[ cut here ]------------
[   65.669543] Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object 'TCPv6' (offset 704, size 64)!
[   65.681760] WARNING: CPU: 1 PID: 4705 at mm/usercopy.c:81 usercopy_warn+0xf5/0x120
[   65.689452] Kernel panic - not syncing: panic_on_warn set ...
[   65.689452] 
[   65.697328] Dumping ftrace buffer:
[   65.700858]    (ftrace buffer empty)
[   65.704896] Kernel Offset: disabled
[   65.708504] Rebooting in 86400 seconds..