[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 35.660910] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 38.652046] random: sshd: uninitialized urandom read (32 bytes read) [ 39.207646] random: sshd: uninitialized urandom read (32 bytes read) [ 40.088653] random: sshd: uninitialized urandom read (32 bytes read) [ 40.354095] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 46.118270] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 46.256083] ================================================================== [ 46.263486] BUG: KMSAN: uninit-value in memcmp+0x11d/0x180 [ 46.269104] CPU: 1 PID: 4318 Comm: syz-executor998 Not tainted 4.19.0-rc3+ #49 [ 46.276451] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.285793] Call Trace: [ 46.288374] dump_stack+0x14b/0x190 [ 46.292016] kmsan_report+0x183/0x2b0 [ 46.295819] __msan_warning+0x70/0xc0 [ 46.299617] memcmp+0x11d/0x180 [ 46.302900] dev_uc_add_excl+0x165/0x7b0 [ 46.306966] rtnl_fdb_add+0x1081/0x1270 [ 46.310955] ? rtnl_dump_all+0x540/0x540 [ 46.315007] rtnetlink_rcv_msg+0xa0b/0x1530 [ 46.319332] ? ___sys_sendmsg+0xe70/0x1290 [ 46.323573] ? __alloc_skb+0x201/0x9e0 [ 46.327462] ? netlink_sendmsg+0xb49/0x1290 [ 46.331776] ? ___sys_sendmsg+0xe70/0x1290 [ 46.336001] ? __se_sys_sendmsg+0x2a3/0x3d0 [ 46.340329] ? __x64_sys_sendmsg+0x4a/0x70 [ 46.344575] ? do_syscall_64+0xb8/0x100 [ 46.348566] ? entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 46.353925] ? __msan_poison_alloca+0x173/0x1f0 [ 46.358596] ? __local_bh_enable_ip+0x37/0x150 [ 46.363173] ? _raw_spin_unlock_bh+0x4b/0x60 [ 46.367591] ? kmsan_set_origin_inline+0x6b/0x120 [ 46.372439] ? kmsan_set_origin+0x93/0x150 [ 46.376797] netlink_rcv_skb+0x36e/0x5f0 [ 46.380869] ? rtnetlink_bind+0x120/0x120 [ 46.385050] rtnetlink_rcv+0x50/0x60 [ 46.388775] netlink_unicast+0x1638/0x1720 [ 46.393018] ? rtnetlink_net_exit+0x90/0x90 [ 46.397415] netlink_sendmsg+0x1205/0x1290 [ 46.401664] ___sys_sendmsg+0xe70/0x1290 [ 46.405726] ? netlink_getsockopt+0x11c0/0x11c0 [ 46.410405] ? __fget_light+0x53/0x700 [ 46.414282] ? __fdget+0x4e/0x60 [ 46.417646] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 46.422999] ? __fget_light+0x1f1/0x700 [ 46.427001] __se_sys_sendmsg+0x2a3/0x3d0 [ 46.431165] __x64_sys_sendmsg+0x4a/0x70 [ 46.435217] do_syscall_64+0xb8/0x100 [ 46.439023] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 46.444200] RIP: 0033:0x440ee9 [ 46.447381] Code: e8 cc ab 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 46.466280] RSP: 002b:00007fff6a93b518 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 46.474005] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440ee9 [ 46.481265] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 [ 46.488591] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 46.495944] R10: 00000000004002c8 R11: 0000000000000213 R12: 000000000000b4b0 [ 46.503206] R13: 0000000000401ec0 R14: 0000000000000000 R15: 0000000000000000 [ 46.510485] [ 46.512099] Uninit was created at: [ 46.515639] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 46.520764] kmsan_kmalloc+0x98/0x100 [ 46.524567] kmsan_slab_alloc+0x10/0x20 [ 46.528549] __kmalloc_node_track_caller+0x9e7/0x1160 [ 46.533742] __alloc_skb+0x2f5/0x9e0 [ 46.537454] netlink_sendmsg+0xb49/0x1290 [ 46.541595] ___sys_sendmsg+0xe70/0x1290 [ 46.545648] __se_sys_sendmsg+0x2a3/0x3d0 [ 46.549790] __x64_sys_sendmsg+0x4a/0x70 [ 46.553840] do_syscall_64+0xb8/0x100 [ 46.557632] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 46.562801] ================================================================== [ 46.570145] Disabling lock debugging due to kernel taint [ 46.575583] Kernel panic - not syncing: panic_on_warn set ... [ 46.575583] [ 46.582943] CPU: 1 PID: 4318 Comm: syz-executor998 Tainted: G B 4.19.0-rc3+ #49 [ 46.591673] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.601014] Call Trace: [ 46.603618] dump_stack+0x14b/0x190 [ 46.607262] panic+0x35d/0x8cb [ 46.610470] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 46.615930] kmsan_report+0x2a8/0x2b0 [ 46.619751] __msan_warning+0x70/0xc0 [ 46.623564] memcmp+0x11d/0x180 [ 46.626852] dev_uc_add_excl+0x165/0x7b0 [ 46.630913] rtnl_fdb_add+0x1081/0x1270 [ 46.634899] ? rtnl_dump_all+0x540/0x540 [ 46.638953] rtnetlink_rcv_msg+0xa0b/0x1530 [ 46.643285] ? ___sys_sendmsg+0xe70/0x1290 [ 46.647529] ? __alloc_skb+0x201/0x9e0 [ 46.651424] ? netlink_sendmsg+0xb49/0x1290 [ 46.655737] ? ___sys_sendmsg+0xe70/0x1290 [ 46.659967] ? __se_sys_sendmsg+0x2a3/0x3d0 [ 46.664284] ? __x64_sys_sendmsg+0x4a/0x70 [ 46.668532] ? do_syscall_64+0xb8/0x100 [ 46.672538] ? entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 46.677907] ? __msan_poison_alloca+0x173/0x1f0 [ 46.682584] ? __local_bh_enable_ip+0x37/0x150 [ 46.687177] ? _raw_spin_unlock_bh+0x4b/0x60 [ 46.691591] ? kmsan_set_origin_inline+0x6b/0x120 [ 46.696436] ? kmsan_set_origin+0x93/0x150 [ 46.700672] netlink_rcv_skb+0x36e/0x5f0 [ 46.704730] ? rtnetlink_bind+0x120/0x120 [ 46.708880] rtnetlink_rcv+0x50/0x60 [ 46.712593] netlink_unicast+0x1638/0x1720 [ 46.716828] ? rtnetlink_net_exit+0x90/0x90 [ 46.721153] netlink_sendmsg+0x1205/0x1290 [ 46.725397] ___sys_sendmsg+0xe70/0x1290 [ 46.729456] ? netlink_getsockopt+0x11c0/0x11c0 [ 46.734139] ? __fget_light+0x53/0x700 [ 46.738018] ? __fdget+0x4e/0x60 [ 46.741378] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 46.746734] ? __fget_light+0x1f1/0x700 [ 46.750722] __se_sys_sendmsg+0x2a3/0x3d0 [ 46.754885] __x64_sys_sendmsg+0x4a/0x70 [ 46.758942] do_syscall_64+0xb8/0x100 [ 46.762736] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 46.767924] RIP: 0033:0x440ee9 [ 46.771105] Code: e8 cc ab 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 46.790005] RSP: 002b:00007fff6a93b518 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 46.797708] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440ee9 [ 46.804981] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 [ 46.812266] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 46.819541] R10: 00000000004002c8 R11: 0000000000000213 R12: 000000000000b4b0 [ 46.826824] R13: 0000000000401ec0 R14: 0000000000000000 R15: 0000000000000000 [ 46.834546] Kernel Offset: disabled [ 46.838171] Rebooting in 86400 seconds..