[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.539258] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.615594] random: sshd: uninitialized urandom read (32 bytes read) [ 24.030936] random: sshd: uninitialized urandom read (32 bytes read) [ 24.765554] random: sshd: uninitialized urandom read (32 bytes read) [ 38.841487] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 44.273417] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 44.372505] WARNING: CPU: 1 PID: 4482 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 44.380887] Kernel panic - not syncing: panic_on_warn set ... [ 44.380887] [ 44.388230] CPU: 1 PID: 4482 Comm: syz-executor752 Not tainted 4.17.0-rc3+ #38 [ 44.395562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.404890] Call Trace: [ 44.407462] dump_stack+0x1b9/0x294 [ 44.411069] ? dump_stack_print_info.cold.2+0x52/0x52 [ 44.416243] ? smc_unhash_sk+0x290/0x4a0 [ 44.420283] panic+0x22f/0x4de [ 44.423452] ? add_taint.cold.5+0x16/0x16 [ 44.427583] ? __warn.cold.8+0x148/0x1b3 [ 44.431619] ? __warn.cold.8+0x117/0x1b3 [ 44.435661] ? smc_unhash_sk+0x345/0x4a0 [ 44.439700] __warn.cold.8+0x163/0x1b3 [ 44.443563] ? smc_unhash_sk+0x345/0x4a0 [ 44.447605] report_bug+0x252/0x2d0 [ 44.451213] do_error_trap+0x1de/0x490 [ 44.455079] ? graph_lock+0x170/0x170 [ 44.458860] ? math_error+0x420/0x420 [ 44.462641] ? lock_acquire+0x1dc/0x520 [ 44.466595] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.471417] do_invalid_op+0x1b/0x20 [ 44.475110] invalid_op+0x14/0x20 [ 44.478541] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 44.483183] RSP: 0018:ffff8801cf22f488 EFLAGS: 00010293 [ 44.488524] RAX: ffff8801aee6e680 RBX: ffff8801af2807c0 RCX: ffffffff873f7cfe [ 44.495772] RDX: 0000000000000000 RSI: ffffffff873f7db5 RDI: 0000000000000005 [ 44.503021] RBP: ffff8801cf22f570 R08: ffff8801aee6e680 R09: ffffed0035e50108 [ 44.510268] R10: ffffed0035e50108 R11: ffff8801af280843 R12: 1ffff10039e45e95 [ 44.517525] R13: ffff8801cf22f548 R14: ffffffff8970b1e0 R15: ffff8801af280840 [ 44.524781] ? smc_unhash_sk+0x28e/0x4a0 [ 44.528817] ? smc_unhash_sk+0x345/0x4a0 [ 44.532867] ? smc_unhash_sk+0x345/0x4a0 [ 44.536905] ? smc_rx_data_available+0x100/0x100 [ 44.541648] ? release_sock+0x1e2/0x2b0 [ 44.545602] ? __local_bh_enable_ip+0x161/0x230 [ 44.550264] ? __release_sock+0x3a0/0x3a0 [ 44.554390] ? smc_release+0x269/0x610 [ 44.558255] ? trace_hardirqs_on+0xd/0x10 [ 44.562382] ? __local_bh_enable_ip+0x161/0x230 [ 44.567030] smc_release+0x36e/0x610 [ 44.570725] sock_release+0x96/0x1b0 [ 44.574424] ? sock_alloc_file+0x4e0/0x4e0 [ 44.578637] sock_close+0x16/0x20 [ 44.582071] __fput+0x34d/0x890 [ 44.585331] ? fput+0x1a0/0x1a0 [ 44.588596] ? _raw_spin_unlock_irq+0x27/0x70 [ 44.593071] ____fput+0x15/0x20 [ 44.596333] task_work_run+0x1e4/0x290 [ 44.600287] ? task_work_cancel+0x240/0x240 [ 44.604595] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 44.610200] ? switch_task_namespaces+0xa2/0xd0 [ 44.614848] do_exit+0x1aee/0x2730 [ 44.618369] ? mm_update_next_owner+0x980/0x980 [ 44.623028] ? find_held_lock+0x36/0x1c0 [ 44.627077] ? lock_downgrade+0x8e0/0x8e0 [ 44.631202] ? lock_downgrade+0x8e0/0x8e0 [ 44.635332] ? kasan_check_read+0x11/0x20 [ 44.639460] ? do_raw_spin_unlock+0x9e/0x2e0 [ 44.643851] ? __local_bh_enable_ip+0x161/0x230 [ 44.648497] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.653499] ? release_sock+0x1e2/0x2b0 [ 44.657451] ? trace_hardirqs_on+0xd/0x10 [ 44.661579] ? __local_bh_enable_ip+0x161/0x230 [ 44.666226] ? _raw_spin_unlock_bh+0x30/0x40 [ 44.670614] ? release_sock+0x1e2/0x2b0 [ 44.674568] ? __release_sock+0x3a0/0x3a0 [ 44.678695] ? __local_bh_enable_ip+0x161/0x230 [ 44.683867] ? lock_sock_nested+0xe7/0x120 [ 44.688082] ? smc_sendmsg+0x2d5/0x370 [ 44.691944] ? smc_sendpage+0x1a0/0x1a0 [ 44.695899] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.701415] ? sock_sendmsg+0x5a/0x120 [ 44.705284] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.710808] ? __sys_sendto+0x475/0x670 [ 44.714769] ? __ia32_sys_getpeername+0xb0/0xb0 [ 44.719422] ? lock_downgrade+0x8e0/0x8e0 [ 44.723549] ? handle_mm_fault+0x8c0/0xc70 [ 44.727774] ? handle_mm_fault+0x55a/0xc70 [ 44.732005] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.737523] do_group_exit+0x16f/0x430 [ 44.741392] ? mm_fault_error+0x380/0x380 [ 44.745521] ? __ia32_sys_exit+0x50/0x50 [ 44.749564] ? do_syscall_64+0x92/0x800 [ 44.753536] __x64_sys_exit_group+0x3e/0x50 [ 44.757938] do_syscall_64+0x1b1/0x800 [ 44.761804] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 44.766632] ? syscall_return_slowpath+0x5c0/0x5c0 [ 44.771539] ? syscall_return_slowpath+0x30f/0x5c0 [ 44.776452] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 44.781806] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.786633] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.791814] RIP: 0033:0x43e918 [ 44.794990] RSP: 002b:00007ffc1ea82678 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 44.802682] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 44.809930] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 44.817185] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 44.824435] R10: 0000000020000001 R11: 0000000000000246 R12: 0000000000000001 [ 44.831689] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 44.839391] Dumping ftrace buffer: [ 44.842979] (ftrace buffer empty) [ 44.846666] Kernel Offset: disabled [ 44.850276] Rebooting in 86400 seconds..