[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.680241] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.259133] random: sshd: uninitialized urandom read (32 bytes read) [ 24.637194] random: sshd: uninitialized urandom read (32 bytes read) [ 25.408115] random: sshd: uninitialized urandom read (32 bytes read) [ 25.566470] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts. [ 30.982713] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.075454] WARNING: CPU: 1 PID: 4510 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.083854] Kernel panic - not syncing: panic_on_warn set ... [ 31.083854] [ 31.091224] CPU: 1 PID: 4510 Comm: syz-executor434 Not tainted 4.17.0-rc4+ #41 [ 31.098596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.107951] Call Trace: [ 31.110530] dump_stack+0x1b9/0x294 [ 31.114139] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.119314] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.123371] panic+0x22f/0x4de [ 31.126554] ? add_taint.cold.5+0x16/0x16 [ 31.130686] ? __warn.cold.8+0x148/0x1b3 [ 31.134729] ? __warn.cold.8+0x117/0x1b3 [ 31.138777] ? smc_unhash_sk+0x345/0x4a0 [ 31.142833] __warn.cold.8+0x163/0x1b3 [ 31.146713] ? smc_unhash_sk+0x345/0x4a0 [ 31.150768] report_bug+0x252/0x2d0 [ 31.154381] do_error_trap+0x1de/0x490 [ 31.158251] ? graph_lock+0x170/0x170 [ 31.162036] ? math_error+0x420/0x420 [ 31.165824] ? lock_acquire+0x1dc/0x520 [ 31.169796] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.174622] do_invalid_op+0x1b/0x20 [ 31.178325] invalid_op+0x14/0x20 [ 31.181782] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.186444] RSP: 0018:ffff8801cf127488 EFLAGS: 00010293 [ 31.191788] RAX: ffff8801d903c000 RBX: ffff8801d939e7c0 RCX: ffffffff87404cbe [ 31.199141] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 31.206587] RBP: ffff8801cf127570 R08: ffff8801d903c000 R09: ffffed003b273d08 [ 31.213838] R10: ffffed003b273d08 R11: ffff8801d939e843 R12: 1ffff10039e24e95 [ 31.221111] R13: ffff8801cf127548 R14: ffffffff8970cc20 R15: ffff8801d939e840 [ 31.228392] ? smc_unhash_sk+0x28e/0x4a0 [ 31.232447] ? smc_unhash_sk+0x345/0x4a0 [ 31.236645] ? smc_unhash_sk+0x345/0x4a0 [ 31.240687] ? smc_rx_data_available+0x100/0x100 [ 31.245433] ? release_sock+0x1e2/0x2b0 [ 31.249389] ? __local_bh_enable_ip+0x161/0x230 [ 31.254491] ? __release_sock+0x3a0/0x3a0 [ 31.258625] ? smc_release+0x269/0x610 [ 31.262496] ? trace_hardirqs_on+0xd/0x10 [ 31.266625] ? __local_bh_enable_ip+0x161/0x230 [ 31.271277] smc_release+0x36e/0x610 [ 31.274977] sock_release+0x96/0x1b0 [ 31.278685] ? sock_alloc_file+0x4e0/0x4e0 [ 31.282916] sock_close+0x16/0x20 [ 31.286350] __fput+0x34d/0x890 [ 31.289613] ? fput+0x1a0/0x1a0 [ 31.292878] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.297356] ____fput+0x15/0x20 [ 31.300626] task_work_run+0x1e4/0x290 [ 31.304493] ? task_work_cancel+0x240/0x240 [ 31.308796] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.314323] ? switch_task_namespaces+0xa2/0xd0 [ 31.318974] do_exit+0x1aee/0x2730 [ 31.322501] ? mm_update_next_owner+0x980/0x980 [ 31.327152] ? lock_downgrade+0x8e0/0x8e0 [ 31.331279] ? noop_count+0x40/0x40 [ 31.334886] ? lock_pin_lock+0x350/0x350 [ 31.338942] ? kasan_check_read+0x11/0x20 [ 31.343160] ? rcu_is_watching+0x85/0x140 [ 31.347290] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.352465] ? is_bpf_text_address+0xd7/0x170 [ 31.356942] ? check_usage_backwards+0x151/0x3a0 [ 31.361689] ? graph_lock+0x170/0x170 [ 31.365479] ? graph_lock+0x170/0x170 [ 31.369261] ? find_held_lock+0x36/0x1c0 [ 31.373307] ? lock_downgrade+0x8e0/0x8e0 [ 31.377524] ? kasan_check_read+0x11/0x20 [ 31.381654] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.387051] ? __local_bh_enable_ip+0x161/0x230 [ 31.391708] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.396711] ? release_sock+0x1e2/0x2b0 [ 31.400674] ? trace_hardirqs_on+0xd/0x10 [ 31.404814] ? __local_bh_enable_ip+0x161/0x230 [ 31.409465] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.413863] ? release_sock+0x1e2/0x2b0 [ 31.417816] ? __release_sock+0x3a0/0x3a0 [ 31.421958] ? __local_bh_enable_ip+0x161/0x230 [ 31.426612] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.431785] ? smc_setsockopt+0x1ed/0x630 [ 31.435914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.441444] ? __sys_setsockopt+0x24f/0x390 [ 31.445751] do_group_exit+0x16f/0x430 [ 31.449618] ? mm_fault_error+0x380/0x380 [ 31.453747] ? __ia32_sys_exit+0x50/0x50 [ 31.457791] ? do_syscall_64+0x92/0x800 [ 31.461747] __x64_sys_exit_group+0x3e/0x50 [ 31.466050] do_syscall_64+0x1b1/0x800 [ 31.469922] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.474830] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.479757] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.485110] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.489943] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.495112] RIP: 0033:0x43e8d8 [ 31.498280] RSP: 002b:00007ffd9b5cb068 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.505988] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.513238] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.520492] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.527740] R10: 0000000020000280 R11: 0000000000000246 R12: 0000000000000001 [ 31.535082] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.543052] Dumping ftrace buffer: [ 31.546669] (ftrace buffer empty) [ 31.550362] Kernel Offset: disabled [ 31.553976] Rebooting in 86400 seconds..