[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 30.902258] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.099106] random: sshd: uninitialized urandom read (32 bytes read) [ 34.469427] random: sshd: uninitialized urandom read (32 bytes read) [ 35.624652] random: sshd: uninitialized urandom read (32 bytes read) [ 35.844563] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 41.288791] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.397479] ================================================================== [ 41.404854] BUG: KMSAN: uninit-value in tipc_nl_compat_dumpit+0x490/0x870 [ 41.411757] CPU: 0 PID: 4507 Comm: syz-executor018 Not tainted 4.17.0-rc3+ #88 [ 41.419087] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.428415] Call Trace: [ 41.430979] dump_stack+0x185/0x1d0 [ 41.434583] ? tipc_nl_compat_dumpit+0x490/0x870 [ 41.439318] kmsan_report+0x142/0x240 [ 41.443097] __msan_warning_32+0x6c/0xb0 [ 41.447137] tipc_nl_compat_dumpit+0x490/0x870 [ 41.451695] tipc_nl_compat_recv+0x1394/0x2700 [ 41.456254] ? _cond_resched+0x3c/0xd0 [ 41.460117] ? mutex_lock+0x31/0x90 [ 41.463733] ? rcu_all_qs+0x32/0x1f0 [ 41.467421] ? tipc_nl_node_reset_link_stats+0x5c0/0x5c0 [ 41.472845] ? tipc_nl_compat_bearer_disable+0x370/0x370 [ 41.478270] ? tipc_netlink_compat_stop+0x40/0x40 [ 41.483087] genl_rcv_msg+0x1686/0x1810 [ 41.487055] netlink_rcv_skb+0x378/0x600 [ 41.491094] ? genl_unbind+0x350/0x350 [ 41.494958] genl_rcv+0x63/0x80 [ 41.498211] netlink_unicast+0x166b/0x1740 [ 41.502422] ? genl_pernet_exit+0xa0/0xa0 [ 41.506547] netlink_sendmsg+0x1072/0x1370 [ 41.510768] ? netlink_getsockopt+0xc80/0xc80 [ 41.515239] ___sys_sendmsg+0xec0/0x1310 [ 41.519277] ? __fdget+0x4e/0x60 [ 41.522619] ? __fget_light+0x56/0x710 [ 41.526481] ? __fdget+0x4e/0x60 [ 41.529822] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 41.535160] ? __fget_light+0x6b9/0x710 [ 41.539113] __x64_sys_sendmsg+0x331/0x460 [ 41.543328] do_syscall_64+0x154/0x220 [ 41.547193] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.552356] RIP: 0033:0x445599 [ 41.555523] RSP: 002b:00007f4c1ecc6db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 41.563206] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445599 [ 41.570450] RDX: 0000000000000000 RSI: 0000000020023000 RDI: 0000000000000003 [ 41.577695] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 41.584943] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 41.592187] R13: 00007ffe5ef31bcf R14: 00007f4c1ecc79c0 R15: 0000000000000001 [ 41.599431] [ 41.601033] Uninit was created at: [ 41.604574] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 41.609652] kmsan_kmalloc+0x94/0x100 [ 41.613427] kmsan_slab_alloc+0x10/0x20 [ 41.617375] __kmalloc_node_track_caller+0xb32/0x11b0 [ 41.622544] __alloc_skb+0x2cf/0x9f0 [ 41.626236] netlink_sendmsg+0x76e/0x1370 [ 41.630364] ___sys_sendmsg+0xec0/0x1310 [ 41.634404] __x64_sys_sendmsg+0x331/0x460 [ 41.638620] do_syscall_64+0x154/0x220 [ 41.642486] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.647645] ================================================================== [ 41.654976] Disabling lock debugging due to kernel taint [ 41.660400] Kernel panic - not syncing: panic_on_warn set ... [ 41.660400] [ 41.667748] CPU: 0 PID: 4507 Comm: syz-executor018 Tainted: G B 4.17.0-rc3+ #88 [ 41.676467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.685793] Call Trace: [ 41.688362] dump_stack+0x185/0x1d0 [ 41.691967] panic+0x39d/0x940 [ 41.695146] ? tipc_nl_compat_dumpit+0x490/0x870 [ 41.699881] kmsan_report+0x238/0x240 [ 41.703658] __msan_warning_32+0x6c/0xb0 [ 41.707696] tipc_nl_compat_dumpit+0x490/0x870 [ 41.712258] tipc_nl_compat_recv+0x1394/0x2700 [ 41.716814] ? _cond_resched+0x3c/0xd0 [ 41.720678] ? mutex_lock+0x31/0x90 [ 41.724284] ? rcu_all_qs+0x32/0x1f0 [ 41.727973] ? tipc_nl_node_reset_link_stats+0x5c0/0x5c0 [ 41.733398] ? tipc_nl_compat_bearer_disable+0x370/0x370 [ 41.738823] ? tipc_netlink_compat_stop+0x40/0x40 [ 41.743647] genl_rcv_msg+0x1686/0x1810 [ 41.747606] netlink_rcv_skb+0x378/0x600 [ 41.751644] ? genl_unbind+0x350/0x350 [ 41.755509] genl_rcv+0x63/0x80 [ 41.758767] netlink_unicast+0x166b/0x1740 [ 41.762981] ? genl_pernet_exit+0xa0/0xa0 [ 41.767105] netlink_sendmsg+0x1072/0x1370 [ 41.771316] ? netlink_getsockopt+0xc80/0xc80 [ 41.775788] ___sys_sendmsg+0xec0/0x1310 [ 41.779826] ? __fdget+0x4e/0x60 [ 41.783166] ? __fget_light+0x56/0x710 [ 41.787033] ? __fdget+0x4e/0x60 [ 41.790382] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 41.795718] ? __fget_light+0x6b9/0x710 [ 41.799676] __x64_sys_sendmsg+0x331/0x460 [ 41.803889] do_syscall_64+0x154/0x220 [ 41.807754] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.812919] RIP: 0033:0x445599 [ 41.816089] RSP: 002b:00007f4c1ecc6db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 41.823793] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445599 [ 41.831045] RDX: 0000000000000000 RSI: 0000000020023000 RDI: 0000000000000003 [ 41.838292] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 41.845537] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 41.852782] R13: 00007ffe5ef31bcf R14: 00007f4c1ecc79c0 R15: 0000000000000001 [ 41.860498] Dumping ftrace buffer: [ 41.864018] (ftrace buffer empty) [ 41.867703] Kernel Offset: disabled [ 41.871652] Rebooting in 86400 seconds..