[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.109704] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.661150] random: sshd: uninitialized urandom read (32 bytes read) [ 23.951330] random: sshd: uninitialized urandom read (32 bytes read) [ 24.713230] random: sshd: uninitialized urandom read (32 bytes read) [ 41.167124] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 46.669275] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.759249] WARNING: CPU: 1 PID: 4514 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 46.767629] Kernel panic - not syncing: panic_on_warn set ... [ 46.767629] [ 46.774977] CPU: 1 PID: 4514 Comm: syz-executor212 Not tainted 4.17.0-rc3+ #33 [ 46.782317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.791673] Call Trace: [ 46.794246] dump_stack+0x1b9/0x294 [ 46.797870] ? dump_stack_print_info.cold.2+0x52/0x52 [ 46.803059] ? smc_unhash_sk+0x270/0x4a0 [ 46.807107] panic+0x22f/0x4de [ 46.810300] ? add_taint.cold.5+0x16/0x16 [ 46.814436] ? __warn.cold.8+0x148/0x1b3 [ 46.818494] ? __warn.cold.8+0x117/0x1b3 [ 46.822548] ? smc_unhash_sk+0x345/0x4a0 [ 46.826595] __warn.cold.8+0x163/0x1b3 [ 46.830561] ? smc_unhash_sk+0x345/0x4a0 [ 46.834612] report_bug+0x252/0x2d0 [ 46.838226] do_error_trap+0x1de/0x490 [ 46.842106] ? graph_lock+0x170/0x170 [ 46.845892] ? math_error+0x420/0x420 [ 46.849682] ? lock_acquire+0x1dc/0x520 [ 46.853640] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.858465] do_invalid_op+0x1b/0x20 [ 46.862161] invalid_op+0x14/0x20 [ 46.865611] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 46.870264] RSP: 0018:ffff8801acfc7488 EFLAGS: 00010293 [ 46.875608] RAX: ffff8801aca0e440 RBX: ffff8801acd0e7c0 RCX: ffffffff873fe71e [ 46.882864] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 46.890134] RBP: ffff8801acfc7570 R08: ffff8801aca0e440 R09: ffffed00359a1d08 [ 46.897390] R10: ffffed00359a1d08 R11: ffff8801acd0e843 R12: 1ffff100359f8e95 [ 46.904644] R13: ffff8801acfc7548 R14: ffffffff8970e4e0 R15: ffff8801acd0e840 [ 46.911912] ? smc_unhash_sk+0x28e/0x4a0 [ 46.915960] ? smc_unhash_sk+0x345/0x4a0 [ 46.920002] ? smc_unhash_sk+0x345/0x4a0 [ 46.924042] ? smc_rx_data_available+0x100/0x100 [ 46.928779] ? release_sock+0x1e2/0x2b0 [ 46.932735] ? __local_bh_enable_ip+0x161/0x230 [ 46.937383] ? __release_sock+0x3a0/0x3a0 [ 46.941510] ? smc_release+0x269/0x610 [ 46.945381] ? trace_hardirqs_on+0xd/0x10 [ 46.949536] ? __local_bh_enable_ip+0x161/0x230 [ 46.954278] smc_release+0x36e/0x610 [ 46.957977] sock_release+0x96/0x1b0 [ 46.961673] ? sock_alloc_file+0x4e0/0x4e0 [ 46.965886] sock_close+0x16/0x20 [ 46.969321] __fput+0x34d/0x890 [ 46.972587] ? fput+0x1a0/0x1a0 [ 46.975851] ? _raw_spin_unlock_irq+0x27/0x70 [ 46.980329] ____fput+0x15/0x20 [ 46.983588] task_work_run+0x1e4/0x290 [ 46.987455] ? task_work_cancel+0x240/0x240 [ 46.991765] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.997296] ? switch_task_namespaces+0xa2/0xd0 [ 47.001952] do_exit+0x1aee/0x2730 [ 47.005477] ? mm_update_next_owner+0x980/0x980 [ 47.010125] ? lock_downgrade+0x8e0/0x8e0 [ 47.014269] ? noop_count+0x40/0x40 [ 47.017874] ? lock_pin_lock+0x350/0x350 [ 47.021915] ? kasan_check_read+0x11/0x20 [ 47.026044] ? rcu_is_watching+0x85/0x140 [ 47.030174] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 47.035348] ? is_bpf_text_address+0xd7/0x170 [ 47.039825] ? check_usage_backwards+0x151/0x3a0 [ 47.044564] ? graph_lock+0x170/0x170 [ 47.048349] ? graph_lock+0x170/0x170 [ 47.052133] ? find_held_lock+0x36/0x1c0 [ 47.056179] ? lock_downgrade+0x8e0/0x8e0 [ 47.060305] ? kasan_check_read+0x11/0x20 [ 47.064430] ? do_raw_spin_unlock+0x9e/0x2e0 [ 47.068826] ? __local_bh_enable_ip+0x161/0x230 [ 47.073473] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.078467] ? release_sock+0x1e2/0x2b0 [ 47.082415] ? trace_hardirqs_on+0xd/0x10 [ 47.086541] ? __local_bh_enable_ip+0x161/0x230 [ 47.091190] ? _raw_spin_unlock_bh+0x30/0x40 [ 47.095587] ? release_sock+0x1e2/0x2b0 [ 47.099542] ? __release_sock+0x3a0/0x3a0 [ 47.103672] ? __local_bh_enable_ip+0x161/0x230 [ 47.108324] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 47.113496] ? smc_setsockopt+0x1ed/0x630 [ 47.117625] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.123156] ? __sys_setsockopt+0x24f/0x390 [ 47.127457] do_group_exit+0x16f/0x430 [ 47.131322] ? mm_fault_error+0x380/0x380 [ 47.135446] ? __ia32_sys_exit+0x50/0x50 [ 47.139489] ? do_syscall_64+0x92/0x800 [ 47.143444] __x64_sys_exit_group+0x3e/0x50 [ 47.147744] do_syscall_64+0x1b1/0x800 [ 47.151610] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 47.156431] ? syscall_return_slowpath+0x5c0/0x5c0 [ 47.161338] ? syscall_return_slowpath+0x30f/0x5c0 [ 47.166261] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 47.171606] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.176480] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.181650] RIP: 0033:0x43e8d8 [ 47.184815] RSP: 002b:00007ffc37a6c678 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 47.192505] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 47.199755] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 47.207033] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 47.214282] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 47.221527] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 47.229273] Dumping ftrace buffer: [ 47.232869] (ftrace buffer empty) [ 47.236554] Kernel Offset: disabled [ 47.240162] Rebooting in 86400 seconds..