[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.974639] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.042189] random: sshd: uninitialized urandom read (32 bytes read) [ 24.242550] random: sshd: uninitialized urandom read (32 bytes read) [ 24.996138] random: sshd: uninitialized urandom read (32 bytes read) [ 25.152994] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 30.606469] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.698484] WARNING: CPU: 1 PID: 4499 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.706871] Kernel panic - not syncing: panic_on_warn set ... [ 30.706871] [ 30.714225] CPU: 1 PID: 4499 Comm: syz-executor001 Not tainted 4.17.0-rc6+ #63 [ 30.721563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.730898] Call Trace: [ 30.733473] dump_stack+0x1b9/0x294 [ 30.737081] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.742260] ? smc_unhash_sk+0x290/0x4a0 [ 30.746302] panic+0x22f/0x4de [ 30.749479] ? add_taint.cold.5+0x16/0x16 [ 30.753621] ? __warn.cold.8+0x148/0x1b3 [ 30.757677] ? __warn.cold.8+0x117/0x1b3 [ 30.761727] ? smc_unhash_sk+0x345/0x4a0 [ 30.765770] __warn.cold.8+0x163/0x1b3 [ 30.769637] ? smc_unhash_sk+0x345/0x4a0 [ 30.773681] report_bug+0x252/0x2d0 [ 30.777289] do_error_trap+0x1de/0x490 [ 30.781154] ? graph_lock+0x170/0x170 [ 30.784934] ? math_error+0x420/0x420 [ 30.788718] ? lock_acquire+0x1dc/0x520 [ 30.792681] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.797512] do_invalid_op+0x1b/0x20 [ 30.801203] invalid_op+0x14/0x20 [ 30.804634] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.809278] RSP: 0018:ffff8801acf2f488 EFLAGS: 00010293 [ 30.814618] RAX: ffff8801acd78300 RBX: ffff8801d965c7c0 RCX: ffffffff87427cfe [ 30.821866] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 30.829116] RBP: ffff8801acf2f570 R08: ffff8801acd78300 R09: ffffed003b2cb908 [ 30.836372] R10: ffffed003b2cb908 R11: ffff8801d965c843 R12: 1ffff100359e5e95 [ 30.843634] R13: ffff8801acf2f548 R14: ffffffff8970ea60 R15: ffff8801d965c840 [ 30.850894] ? smc_unhash_sk+0x28e/0x4a0 [ 30.854933] ? smc_unhash_sk+0x345/0x4a0 [ 30.858983] ? smc_unhash_sk+0x345/0x4a0 [ 30.863037] ? smc_rx_data_available+0x100/0x100 [ 30.867776] ? release_sock+0x1e2/0x2b0 [ 30.871732] ? __local_bh_enable_ip+0x161/0x230 [ 30.876379] ? __release_sock+0x3a0/0x3a0 [ 30.880514] ? smc_release+0x269/0x610 [ 30.884384] ? trace_hardirqs_on+0xd/0x10 [ 30.888515] ? __local_bh_enable_ip+0x161/0x230 [ 30.893167] smc_release+0x36e/0x610 [ 30.896862] sock_release+0x96/0x1b0 [ 30.900553] ? sock_alloc_file+0x4e0/0x4e0 [ 30.904766] sock_close+0x16/0x20 [ 30.908196] __fput+0x34d/0x890 [ 30.911458] ? fput+0x1a0/0x1a0 [ 30.914718] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.919192] ____fput+0x15/0x20 [ 30.922454] task_work_run+0x1e4/0x290 [ 30.926320] ? task_work_cancel+0x240/0x240 [ 30.930624] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.936141] ? switch_task_namespaces+0xa2/0xd0 [ 30.940790] do_exit+0x1aee/0x2730 [ 30.944314] ? mm_update_next_owner+0x980/0x980 [ 30.948961] ? lock_downgrade+0x8e0/0x8e0 [ 30.953086] ? noop_count+0x40/0x40 [ 30.956690] ? lock_pin_lock+0x350/0x350 [ 30.960735] ? kasan_check_read+0x11/0x20 [ 30.964863] ? rcu_is_watching+0x85/0x140 [ 30.968989] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.974165] ? is_bpf_text_address+0xd7/0x170 [ 30.978640] ? check_usage_backwards+0x151/0x3a0 [ 30.983374] ? graph_lock+0x170/0x170 [ 30.987157] ? graph_lock+0x170/0x170 [ 30.990939] ? find_held_lock+0x36/0x1c0 [ 30.994991] ? lock_downgrade+0x8e0/0x8e0 [ 30.999126] ? kasan_check_read+0x11/0x20 [ 31.003251] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.007639] ? __local_bh_enable_ip+0x161/0x230 [ 31.012287] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.017282] ? release_sock+0x1e2/0x2b0 [ 31.021233] ? trace_hardirqs_on+0xd/0x10 [ 31.025359] ? __local_bh_enable_ip+0x161/0x230 [ 31.030037] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.034436] ? release_sock+0x1e2/0x2b0 [ 31.038391] ? __release_sock+0x3a0/0x3a0 [ 31.042526] ? __local_bh_enable_ip+0x161/0x230 [ 31.047186] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.052362] ? smc_setsockopt+0x1ed/0x6d0 [ 31.056498] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.062039] ? __sys_setsockopt+0x24f/0x390 [ 31.066354] do_group_exit+0x16f/0x430 [ 31.070229] ? mm_fault_error+0x380/0x380 [ 31.074357] ? __ia32_sys_exit+0x50/0x50 [ 31.078407] ? do_syscall_64+0x92/0x800 [ 31.082363] __x64_sys_exit_group+0x3e/0x50 [ 31.086667] do_syscall_64+0x1b1/0x800 [ 31.090535] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.095446] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.100359] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.105708] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.110534] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.115791] RIP: 0033:0x43e8d8 [ 31.118958] RSP: 002b:00007ffd9f99ea48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.126645] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.133897] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.141146] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.148394] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 31.155642] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.163469] Dumping ftrace buffer: [ 31.167086] (ftrace buffer empty) [ 31.170771] Kernel Offset: disabled [ 31.174380] Rebooting in 86400 seconds..