[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.913572] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.034201] random: sshd: uninitialized urandom read (32 bytes read) [ 21.269747] random: sshd: uninitialized urandom read (32 bytes read) [ 22.074617] random: sshd: uninitialized urandom read (32 bytes read) [ 22.231185] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 27.714820] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.836759] WARNING: CPU: 1 PID: 4513 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.845152] Kernel panic - not syncing: panic_on_warn set ... [ 27.845152] [ 27.852509] CPU: 1 PID: 4513 Comm: syz-executor191 Not tainted 4.17.0-rc4+ #49 [ 27.859850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.869178] Call Trace: [ 27.871749] dump_stack+0x1b9/0x294 [ 27.875355] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.880530] ? smc_unhash_sk+0x250/0x4a0 [ 27.884574] panic+0x22f/0x4de [ 27.887746] ? add_taint.cold.5+0x16/0x16 [ 27.891895] ? __warn.cold.8+0x148/0x1b3 [ 27.895932] ? __warn.cold.8+0x117/0x1b3 [ 27.899974] ? smc_unhash_sk+0x345/0x4a0 [ 27.904022] __warn.cold.8+0x163/0x1b3 [ 27.907892] ? smc_unhash_sk+0x345/0x4a0 [ 27.911943] report_bug+0x252/0x2d0 [ 27.915556] do_error_trap+0x1de/0x490 [ 27.919422] ? graph_lock+0x170/0x170 [ 27.923206] ? math_error+0x420/0x420 [ 27.926991] ? lock_acquire+0x1dc/0x520 [ 27.930951] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.935771] do_invalid_op+0x1b/0x20 [ 27.939465] invalid_op+0x14/0x20 [ 27.942898] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.947558] RSP: 0018:ffff8801adcd7488 EFLAGS: 00010293 [ 27.952907] RAX: ffff8801aded0600 RBX: ffff8801aee047c0 RCX: ffffffff8740f43e [ 27.960171] RDX: 0000000000000000 RSI: ffffffff8740f4f5 RDI: 0000000000000005 [ 27.967422] RBP: ffff8801adcd7570 R08: ffff8801aded0600 R09: ffffed0035dc0908 [ 27.974678] R10: ffffed0035dc0908 R11: ffff8801aee04843 R12: 1ffff10035b9ae95 [ 27.981925] R13: ffff8801adcd7548 R14: ffffffff8970da60 R15: ffff8801aee04840 [ 27.989190] ? smc_unhash_sk+0x28e/0x4a0 [ 27.993234] ? smc_unhash_sk+0x345/0x4a0 [ 27.997279] ? smc_unhash_sk+0x345/0x4a0 [ 28.001322] ? smc_rx_data_available+0x100/0x100 [ 28.006064] ? release_sock+0x1e2/0x2b0 [ 28.010028] ? __local_bh_enable_ip+0x161/0x230 [ 28.014688] ? __release_sock+0x3a0/0x3a0 [ 28.018814] ? smc_release+0x269/0x610 [ 28.022683] ? trace_hardirqs_on+0xd/0x10 [ 28.026810] ? __local_bh_enable_ip+0x161/0x230 [ 28.031462] smc_release+0x36e/0x610 [ 28.035160] sock_release+0x96/0x1b0 [ 28.038855] ? sock_alloc_file+0x4e0/0x4e0 [ 28.043068] sock_close+0x16/0x20 [ 28.046500] __fput+0x34d/0x890 [ 28.049763] ? fput+0x1a0/0x1a0 [ 28.053032] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.057508] ____fput+0x15/0x20 [ 28.060771] task_work_run+0x1e4/0x290 [ 28.064643] ? task_work_cancel+0x240/0x240 [ 28.068953] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.074470] ? switch_task_namespaces+0xa2/0xd0 [ 28.079120] do_exit+0x1aee/0x2730 [ 28.082647] ? mm_update_next_owner+0x980/0x980 [ 28.087294] ? lock_downgrade+0x8e0/0x8e0 [ 28.091427] ? noop_count+0x40/0x40 [ 28.095039] ? lock_pin_lock+0x350/0x350 [ 28.099091] ? kasan_check_read+0x11/0x20 [ 28.103234] ? rcu_is_watching+0x85/0x140 [ 28.107363] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.112534] ? is_bpf_text_address+0xd7/0x170 [ 28.117029] ? check_usage_backwards+0x151/0x3a0 [ 28.121781] ? graph_lock+0x170/0x170 [ 28.125565] ? graph_lock+0x170/0x170 [ 28.129350] ? find_held_lock+0x36/0x1c0 [ 28.133396] ? lock_downgrade+0x8e0/0x8e0 [ 28.137525] ? kasan_check_read+0x11/0x20 [ 28.141654] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.146052] ? __local_bh_enable_ip+0x161/0x230 [ 28.150702] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.155706] ? release_sock+0x1e2/0x2b0 [ 28.159666] ? trace_hardirqs_on+0xd/0x10 [ 28.163799] ? __local_bh_enable_ip+0x161/0x230 [ 28.168466] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.172858] ? release_sock+0x1e2/0x2b0 [ 28.176823] ? __release_sock+0x3a0/0x3a0 [ 28.180957] ? __local_bh_enable_ip+0x161/0x230 [ 28.185615] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.190788] ? smc_setsockopt+0x1ed/0x6d0 [ 28.194917] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.200432] ? __sys_setsockopt+0x24f/0x390 [ 28.204739] do_group_exit+0x16f/0x430 [ 28.208622] ? mm_fault_error+0x380/0x380 [ 28.212750] ? __ia32_sys_exit+0x50/0x50 [ 28.216793] ? do_syscall_64+0x92/0x800 [ 28.220750] __x64_sys_exit_group+0x3e/0x50 [ 28.225054] do_syscall_64+0x1b1/0x800 [ 28.228921] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.233836] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.238750] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.244094] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.248919] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.254087] RIP: 0033:0x43e8c8 [ 28.257254] RSP: 002b:00007fffe48f0568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.264940] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 28.272188] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.279437] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.286693] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 28.293940] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.301891] Dumping ftrace buffer: [ 28.305512] (ftrace buffer empty) [ 28.309199] Kernel Offset: disabled [ 28.312807] Rebooting in 86400 seconds..