[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.300341] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.224185] random: sshd: uninitialized urandom read (32 bytes read) [ 23.697319] random: sshd: uninitialized urandom read (32 bytes read) [ 24.475993] random: sshd: uninitialized urandom read (32 bytes read) [ 32.018330] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 37.467480] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.570124] WARNING: CPU: 0 PID: 4505 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 37.578499] Kernel panic - not syncing: panic_on_warn set ... [ 37.578499] [ 37.585848] CPU: 0 PID: 4505 Comm: syz-executor837 Not tainted 4.17.0-rc4+ #44 [ 37.593185] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.602515] Call Trace: [ 37.605258] dump_stack+0x1b9/0x294 [ 37.608864] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.614038] ? smc_unhash_sk+0x330/0x4a0 [ 37.618088] panic+0x22f/0x4de [ 37.621258] ? add_taint.cold.5+0x16/0x16 [ 37.625387] ? __warn.cold.8+0x148/0x1b3 [ 37.629424] ? __warn.cold.8+0x117/0x1b3 [ 37.633483] ? smc_unhash_sk+0x345/0x4a0 [ 37.637521] __warn.cold.8+0x163/0x1b3 [ 37.641389] ? smc_unhash_sk+0x345/0x4a0 [ 37.645430] report_bug+0x252/0x2d0 [ 37.649037] do_error_trap+0x1de/0x490 [ 37.652906] ? graph_lock+0x170/0x170 [ 37.656684] ? math_error+0x420/0x420 [ 37.660471] ? lock_acquire+0x1dc/0x520 [ 37.664425] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.669251] do_invalid_op+0x1b/0x20 [ 37.672952] invalid_op+0x14/0x20 [ 37.676385] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 37.681030] RSP: 0018:ffff8801ac2d7488 EFLAGS: 00010293 [ 37.686373] RAX: ffff8801d963e340 RBX: ffff8801d970c7c0 RCX: ffffffff8740565e [ 37.693624] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 37.700871] RBP: ffff8801ac2d7570 R08: ffff8801d963e340 R09: ffffed003b2e1908 [ 37.708117] R10: ffffed003b2e1908 R11: ffff8801d970c843 R12: 1ffff1003585ae95 [ 37.715363] R13: ffff8801ac2d7548 R14: ffffffff8970cba0 R15: ffff8801d970c840 [ 37.722618] ? smc_unhash_sk+0x28e/0x4a0 [ 37.726659] ? smc_unhash_sk+0x345/0x4a0 [ 37.730712] ? smc_unhash_sk+0x345/0x4a0 [ 37.734764] ? smc_rx_data_available+0x100/0x100 [ 37.739505] ? release_sock+0x1e2/0x2b0 [ 37.743463] ? __local_bh_enable_ip+0x161/0x230 [ 37.748125] ? __release_sock+0x3a0/0x3a0 [ 37.752250] ? smc_release+0x269/0x610 [ 37.756115] ? trace_hardirqs_on+0xd/0x10 [ 37.760242] ? __local_bh_enable_ip+0x161/0x230 [ 37.764892] smc_release+0x36e/0x610 [ 37.768587] sock_release+0x96/0x1b0 [ 37.772280] ? sock_alloc_file+0x4e0/0x4e0 [ 37.776496] sock_close+0x16/0x20 [ 37.779931] __fput+0x34d/0x890 [ 37.783193] ? fput+0x1a0/0x1a0 [ 37.786452] ? _raw_spin_unlock_irq+0x27/0x70 [ 37.790931] ____fput+0x15/0x20 [ 37.794189] task_work_run+0x1e4/0x290 [ 37.798055] ? task_work_cancel+0x240/0x240 [ 37.802355] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.807870] ? switch_task_namespaces+0xa2/0xd0 [ 37.812520] do_exit+0x1aee/0x2730 [ 37.816052] ? mm_update_next_owner+0x980/0x980 [ 37.820699] ? lock_downgrade+0x8e0/0x8e0 [ 37.824832] ? noop_count+0x40/0x40 [ 37.828441] ? lock_pin_lock+0x350/0x350 [ 37.832485] ? kasan_check_read+0x11/0x20 [ 37.836614] ? rcu_is_watching+0x85/0x140 [ 37.840742] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 37.845920] ? is_bpf_text_address+0xd7/0x170 [ 37.850395] ? check_usage_backwards+0x151/0x3a0 [ 37.855129] ? graph_lock+0x170/0x170 [ 37.858907] ? graph_lock+0x170/0x170 [ 37.862691] ? find_held_lock+0x36/0x1c0 [ 37.866741] ? lock_downgrade+0x8e0/0x8e0 [ 37.870869] ? kasan_check_read+0x11/0x20 [ 37.874994] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.879383] ? __local_bh_enable_ip+0x161/0x230 [ 37.884029] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.889022] ? release_sock+0x1e2/0x2b0 [ 37.892984] ? trace_hardirqs_on+0xd/0x10 [ 37.897109] ? __local_bh_enable_ip+0x161/0x230 [ 37.901756] ? _raw_spin_unlock_bh+0x30/0x40 [ 37.906152] ? release_sock+0x1e2/0x2b0 [ 37.910109] ? __release_sock+0x3a0/0x3a0 [ 37.914237] ? __local_bh_enable_ip+0x161/0x230 [ 37.918893] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 37.924064] ? smc_setsockopt+0x1ed/0x630 [ 37.928193] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.933712] ? __sys_setsockopt+0x24f/0x390 [ 37.938022] do_group_exit+0x16f/0x430 [ 37.941893] ? mm_fault_error+0x380/0x380 [ 37.946021] ? __ia32_sys_exit+0x50/0x50 [ 37.950066] ? do_syscall_64+0x92/0x800 [ 37.954029] __x64_sys_exit_group+0x3e/0x50 [ 37.958327] do_syscall_64+0x1b1/0x800 [ 37.962196] ? syscall_return_slowpath+0x5c0/0x5c0 [ 37.967108] ? syscall_return_slowpath+0x30f/0x5c0 [ 37.972023] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 37.977376] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.982200] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.987370] RIP: 0033:0x43e8b8 [ 37.990542] RSP: 002b:00007ffc816d0638 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 37.998230] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 38.005488] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 38.012736] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 38.019982] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 38.027227] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 38.035006] Dumping ftrace buffer: [ 38.038649] (ftrace buffer empty) [ 38.042344] Kernel Offset: disabled [ 38.045958] Rebooting in 86400 seconds..