[....] 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..