[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.561979] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.906036] random: sshd: uninitialized urandom read (32 bytes read) [ 22.275158] random: sshd: uninitialized urandom read (32 bytes read) [ 23.043421] random: sshd: uninitialized urandom read (32 bytes read) [ 40.323645] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. [ 45.763263] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 45.853851] WARNING: CPU: 1 PID: 4471 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 45.862254] Kernel panic - not syncing: panic_on_warn set ... [ 45.862254] [ 45.869615] CPU: 1 PID: 4471 Comm: syz-executor072 Not tainted 4.17.0-rc4+ #55 [ 45.877075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.886413] Call Trace: [ 45.888991] dump_stack+0x1b9/0x294 [ 45.892600] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.897784] ? smc_unhash_sk+0x340/0x4a0 [ 45.901828] panic+0x22f/0x4de [ 45.905001] ? add_taint.cold.5+0x16/0x16 [ 45.909132] ? __warn.cold.8+0x148/0x1b3 [ 45.913173] ? __warn.cold.8+0x117/0x1b3 [ 45.917213] ? smc_unhash_sk+0x345/0x4a0 [ 45.921252] __warn.cold.8+0x163/0x1b3 [ 45.925129] ? smc_unhash_sk+0x345/0x4a0 [ 45.929175] report_bug+0x252/0x2d0 [ 45.932790] do_error_trap+0x1de/0x490 [ 45.936754] ? graph_lock+0x170/0x170 [ 45.940534] ? math_error+0x420/0x420 [ 45.944329] ? lock_acquire+0x1dc/0x520 [ 45.948285] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.954390] do_invalid_op+0x1b/0x20 [ 45.958100] invalid_op+0x14/0x20 [ 45.961549] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 45.966197] RSP: 0018:ffff8801b38cf488 EFLAGS: 00010293 [ 45.971541] RAX: ffff8801b3470340 RBX: ffff8801b3f677c0 RCX: ffffffff8740fd4e [ 45.978788] RDX: 0000000000000000 RSI: ffffffff8740fe05 RDI: 0000000000000005 [ 45.986044] RBP: ffff8801b38cf570 R08: ffff8801b3470340 R09: ffffed00367ecf08 [ 45.993295] R10: ffffed00367ecf08 R11: ffff8801b3f67843 R12: 1ffff10036719e95 [ 46.000546] R13: ffff8801b38cf548 R14: ffffffff8970dd60 R15: ffff8801b3f67840 [ 46.007809] ? smc_unhash_sk+0x28e/0x4a0 [ 46.011886] ? smc_unhash_sk+0x345/0x4a0 [ 46.015928] ? smc_unhash_sk+0x345/0x4a0 [ 46.019972] ? smc_rx_data_available+0x100/0x100 [ 46.024708] ? release_sock+0x1e2/0x2b0 [ 46.028662] ? __local_bh_enable_ip+0x161/0x230 [ 46.033310] ? __release_sock+0x3a0/0x3a0 [ 46.037446] ? smc_release+0x269/0x610 [ 46.041313] ? trace_hardirqs_on+0xd/0x10 [ 46.045440] ? __local_bh_enable_ip+0x161/0x230 [ 46.050089] smc_release+0x36e/0x610 [ 46.053786] sock_release+0x96/0x1b0 [ 46.057482] ? sock_alloc_file+0x4e0/0x4e0 [ 46.061694] sock_close+0x16/0x20 [ 46.065127] __fput+0x34d/0x890 [ 46.068385] ? fput+0x1a0/0x1a0 [ 46.071648] ? _raw_spin_unlock_irq+0x27/0x70 [ 46.076124] ____fput+0x15/0x20 [ 46.079380] task_work_run+0x1e4/0x290 [ 46.083246] ? task_work_cancel+0x240/0x240 [ 46.087546] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 46.093060] ? switch_task_namespaces+0xa2/0xd0 [ 46.097711] do_exit+0x1aee/0x2730 [ 46.101234] ? mm_update_next_owner+0x980/0x980 [ 46.105882] ? lock_downgrade+0x8e0/0x8e0 [ 46.110018] ? noop_count+0x40/0x40 [ 46.113624] ? lock_pin_lock+0x350/0x350 [ 46.117667] ? kasan_check_read+0x11/0x20 [ 46.121794] ? rcu_is_watching+0x85/0x140 [ 46.125922] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 46.131093] ? is_bpf_text_address+0xd7/0x170 [ 46.135567] ? check_usage_backwards+0x151/0x3a0 [ 46.140301] ? graph_lock+0x170/0x170 [ 46.144078] ? graph_lock+0x170/0x170 [ 46.147871] ? find_held_lock+0x36/0x1c0 [ 46.151918] ? lock_downgrade+0x8e0/0x8e0 [ 46.156048] ? kasan_check_read+0x11/0x20 [ 46.160173] ? do_raw_spin_unlock+0x9e/0x2e0 [ 46.164557] ? __local_bh_enable_ip+0x161/0x230 [ 46.169205] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 46.174199] ? release_sock+0x1e2/0x2b0 [ 46.178149] ? trace_hardirqs_on+0xd/0x10 [ 46.182275] ? __local_bh_enable_ip+0x161/0x230 [ 46.186923] ? _raw_spin_unlock_bh+0x30/0x40 [ 46.191310] ? release_sock+0x1e2/0x2b0 [ 46.195262] ? __release_sock+0x3a0/0x3a0 [ 46.199394] ? __local_bh_enable_ip+0x161/0x230 [ 46.204046] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 46.209221] ? smc_setsockopt+0x1ed/0x6d0 [ 46.213350] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.218874] ? __sys_setsockopt+0x24f/0x390 [ 46.223178] do_group_exit+0x16f/0x430 [ 46.227044] ? mm_fault_error+0x380/0x380 [ 46.231171] ? __ia32_sys_exit+0x50/0x50 [ 46.235214] ? do_syscall_64+0x92/0x800 [ 46.239166] __x64_sys_exit_group+0x3e/0x50 [ 46.243466] do_syscall_64+0x1b1/0x800 [ 46.247335] ? syscall_return_slowpath+0x5c0/0x5c0 [ 46.252246] ? syscall_return_slowpath+0x30f/0x5c0 [ 46.257176] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 46.262531] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.267355] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.272525] RIP: 0033:0x43e8c8 [ 46.275691] RSP: 002b:00007ffca8c805f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 46.283384] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 46.290641] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 46.297895] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 46.305571] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 46.312835] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 46.320673] Dumping ftrace buffer: [ 46.324306] (ftrace buffer empty) [ 46.327999] Kernel Offset: disabled [ 46.331606] Rebooting in 86400 seconds..