[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.754679] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.001759] random: sshd: uninitialized urandom read (32 bytes read) [ 20.253051] random: sshd: uninitialized urandom read (32 bytes read) [ 20.944296] random: sshd: uninitialized urandom read (32 bytes read) [ 26.525897] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 32.036047] random: sshd: uninitialized urandom read (32 bytes read) net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 32.119863] IPVS: ftp: loaded support on port[0] = 21 [ 32.285877] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.292344] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.299485] device bridge_slave_0 entered promiscuous mode [ 32.315675] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.322112] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.329294] device bridge_slave_1 entered promiscuous mode [ 32.342613] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.356260] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.388883] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 32.404458] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 32.451174] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 32.458243] team0: Port device team_slave_0 added [ 32.470310] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 32.477447] team0: Port device team_slave_1 added [ 32.489572] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 32.504126] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 32.517926] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.532801] 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 [ 32.617790] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.624191] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.630805] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.637274] 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 [ 32.931087] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 32.937208] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.968778] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.001549] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.008722] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 33.041256] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 33.047368] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 33.210894] usercopy: Kernel memory exposure attempt detected from SLAB object 'kmalloc-4096' (offset 2399, size 2626)! [ 33.222110] ------------[ cut here ]------------ [ 33.227145] kernel BUG at mm/usercopy.c:100! [ 33.231597] invalid opcode: 0000 [#1] SMP KASAN [ 33.236258] CPU: 1 PID: 4718 Comm: syz-executor688 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 33.244726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.254074] RIP: 0010:usercopy_abort+0xbb/0xbd [ 33.258631] Code: c0 e8 37 ec b8 ff ff 75 c8 48 8b 55 c0 4d 89 f9 ff 75 d0 4d 89 e8 48 89 d9 4c 89 e6 41 56 48 c7 c7 e0 4c f3 87 e8 37 a0 9f ff <0f> 0b e8 0c ec b8 ff e8 97 42 f7 ff 4c 89 e1 8b 95 14 ff ff ff 31 [ 33.277749] RSP: 0018:ffff8801d33a78b0 EFLAGS: 00010286 [ 33.283107] RAX: 000000000000006b RBX: ffffffff88c10e70 RCX: 0000000000000000 [ 33.290357] RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001 [ 33.297619] RBP: ffff8801d33a7908 R08: ffff8801d1e2a200 R09: ffffed003b5e4fc0 [ 33.304884] R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffffffff87f34bc0 [ 33.312133] R13: ffffffff87f34a80 R14: ffffffff87f34a40 R15: ffffffff88c0c905 [ 33.319395] FS: 00007f56a6072700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 33.327601] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.333459] CR2: 0000000020001000 CR3: 00000001b8fdf000 CR4: 00000000001406e0 [ 33.340740] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.348004] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.355257] Call Trace: [ 33.357854] __check_heap_object+0xb5/0xb5 [ 33.362071] __check_object_size+0x4db/0x5f2 [ 33.366475] ? usercopy_warn+0x120/0x120 [ 33.370522] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 33.375520] ? iov_iter_advance+0x2ec/0x14e0 [ 33.379913] seq_read+0x578/0x10e0 [ 33.383436] ? rw_verify_area+0x118/0x360 [ 33.387574] do_iter_read+0x49e/0x650 [ 33.391354] vfs_readv+0x175/0x1c0 [ 33.394874] ? __fget_light+0x2f7/0x440 [ 33.398827] ? compat_rw_copy_check_uvector+0x440/0x440 [ 33.404172] ? fget_raw+0x20/0x20 [ 33.407616] ? mutex_lock_nested+0x16/0x20 [ 33.411843] ? mutex_lock_nested+0x16/0x20 [ 33.416064] ? __fdget_pos+0xde/0x200 [ 33.419847] ? __fdget_raw+0x20/0x20 [ 33.423542] do_readv+0x11a/0x310 [ 33.426976] ? vfs_readv+0x1c0/0x1c0 [ 33.430687] ? syscall_slow_exit_work+0x500/0x500 [ 33.435522] __x64_sys_readv+0x75/0xb0 [ 33.439402] do_syscall_64+0x1b9/0x820 [ 33.443280] ? finish_task_switch+0x1d3/0x870 [ 33.447755] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.452665] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.457589] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.462593] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.467417] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.472593] RIP: 0033:0x446c09 [ 33.475774] Code: e8 1c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 33.494913] RSP: 002b:00007f56a6071d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 [ 33.502693] RAX: ffffffffffffffda RBX: 00000000006dcc5c RCX: 0000000000446c09 [ 33.509954] RDX: 0000000000000002 RSI: 00000000200021c0 RDI: 0000000000000005 [ 33.517218] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 33.524569] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc58 [ 33.531819] R13: 00007f56a6071d20 R14: 6f72746e6f632f2e R15: 0000000000000007 [ 33.539072] Modules linked in: [ 33.542245] Dumping ftrace buffer: [ 33.545767] (ftrace buffer empty) [ 33.549850] ---[ end trace 532b9c3f493b2e4d ]--- [ 33.554625] RIP: 0010:usercopy_abort+0xbb/0xbd [ 33.559212] Code: c0 e8 37 ec b8 ff ff 75 c8 48 8b 55 c0 4d 89 f9 ff 75 d0 4d 89 e8 48 89 d9 4c 89 e6 41 56 48 c7 c7 e0 4c f3 87 e8 37 a0 9f ff <0f> 0b e8 0c ec b8 ff e8 97 42 f7 ff 4c 89 e1 8b 95 14 ff ff ff 31 [ 33.578389] RSP: 0018:ffff8801d33a78b0 EFLAGS: 00010286 [ 33.583773] RAX: 000000000000006b RBX: ffffffff88c10e70 RCX: 0000000000000000 [ 33.591066] RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001 [ 33.598352] RBP: ffff8801d33a7908 R08: ffff8801d1e2a200 R09: ffffed003b5e4fc0 [ 33.605645] R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffffffff87f34bc0 [ 33.612934] R13: ffffffff87f34a80 R14: ffffffff87f34a40 R15: ffffffff88c0c905 [ 33.620231] FS: 00007f56a6072700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 33.628464] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.634372] CR2: 0000000020001000 CR3: 00000001b8fdf000 CR4: 00000000001406e0 [ 33.641672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.648966] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.656252] Kernel panic - not syncing: Fatal exception [ 33.662097] Dumping ftrace buffer: [ 33.665628] (ftrace buffer empty) [ 33.669328] Kernel Offset: disabled [ 33.672937] Rebooting in 86400 seconds..