[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.790992] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.177963] random: sshd: uninitialized urandom read (32 bytes read) [ 23.627495] random: sshd: uninitialized urandom read (32 bytes read) [ 24.452552] random: sshd: uninitialized urandom read (32 bytes read) [ 24.608238] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts. [ 30.060934] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.150859] WARNING: CPU: 1 PID: 4546 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.159242] Kernel panic - not syncing: panic_on_warn set ... [ 30.159242] [ 30.166600] CPU: 1 PID: 4546 Comm: syz-executor927 Not tainted 4.17.0-rc6+ #58 [ 30.173943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.183281] Call Trace: [ 30.185862] dump_stack+0x1b9/0x294 [ 30.189472] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.194659] ? smc_unhash_sk+0x270/0x4a0 [ 30.198702] panic+0x22f/0x4de [ 30.201873] ? add_taint.cold.5+0x16/0x16 [ 30.206003] ? __warn.cold.8+0x148/0x1b3 [ 30.210058] ? __warn.cold.8+0x117/0x1b3 [ 30.214114] ? smc_unhash_sk+0x345/0x4a0 [ 30.218162] __warn.cold.8+0x163/0x1b3 [ 30.222043] ? smc_unhash_sk+0x345/0x4a0 [ 30.226094] report_bug+0x252/0x2d0 [ 30.229718] do_error_trap+0x1de/0x490 [ 30.233587] ? graph_lock+0x170/0x170 [ 30.237381] ? math_error+0x420/0x420 [ 30.241164] ? lock_acquire+0x1dc/0x520 [ 30.245122] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.249946] do_invalid_op+0x1b/0x20 [ 30.253642] invalid_op+0x14/0x20 [ 30.257081] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.261726] RSP: 0018:ffff8801ad0a7488 EFLAGS: 00010293 [ 30.267074] RAX: ffff8801ad344480 RBX: ffff8801a8a9e7c0 RCX: ffffffff8741441e [ 30.274324] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 30.281579] RBP: ffff8801ad0a7570 R08: ffff8801ad344480 R09: ffffed0035153d08 [ 30.288829] R10: ffffed0035153d08 R11: ffff8801a8a9e843 R12: 1ffff10035a14e95 [ 30.296081] R13: ffff8801ad0a7548 R14: ffffffff8970da60 R15: ffff8801a8a9e840 [ 30.303355] ? smc_unhash_sk+0x28e/0x4a0 [ 30.307406] ? smc_unhash_sk+0x345/0x4a0 [ 30.311459] ? smc_unhash_sk+0x345/0x4a0 [ 30.315514] ? smc_rx_data_available+0x100/0x100 [ 30.320260] ? release_sock+0x1e2/0x2b0 [ 30.324216] ? __local_bh_enable_ip+0x161/0x230 [ 30.328865] ? __release_sock+0x3a0/0x3a0 [ 30.333006] ? smc_release+0x269/0x610 [ 30.336887] ? trace_hardirqs_on+0xd/0x10 [ 30.341028] ? __local_bh_enable_ip+0x161/0x230 [ 30.345693] smc_release+0x36e/0x610 [ 30.349392] sock_release+0x96/0x1b0 [ 30.353093] ? sock_alloc_file+0x4e0/0x4e0 [ 30.357314] sock_close+0x16/0x20 [ 30.360751] __fput+0x34d/0x890 [ 30.364792] ? fput+0x1a0/0x1a0 [ 30.368060] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.372538] ____fput+0x15/0x20 [ 30.375801] task_work_run+0x1e4/0x290 [ 30.379671] ? task_work_cancel+0x240/0x240 [ 30.383978] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.389497] ? switch_task_namespaces+0xa2/0xd0 [ 30.394148] do_exit+0x1aee/0x2730 [ 30.397685] ? mm_update_next_owner+0x980/0x980 [ 30.402338] ? find_held_lock+0x36/0x1c0 [ 30.406390] ? lock_downgrade+0x8e0/0x8e0 [ 30.410516] ? lock_downgrade+0x8e0/0x8e0 [ 30.414647] ? kasan_check_read+0x11/0x20 [ 30.418774] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.423162] ? __local_bh_enable_ip+0x161/0x230 [ 30.427810] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.432808] ? release_sock+0x1e2/0x2b0 [ 30.436766] ? trace_hardirqs_on+0xd/0x10 [ 30.440894] ? __local_bh_enable_ip+0x161/0x230 [ 30.445544] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.449938] ? release_sock+0x1e2/0x2b0 [ 30.453895] ? __release_sock+0x3a0/0x3a0 [ 30.458038] ? __local_bh_enable_ip+0x161/0x230 [ 30.462694] ? lock_sock_nested+0xe7/0x120 [ 30.466915] ? smc_sendmsg+0x2d5/0x370 [ 30.470780] ? smc_sendpage+0x1a0/0x1a0 [ 30.474746] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.480263] ? sock_sendmsg+0x5a/0x120 [ 30.484132] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.489652] ? __sys_sendto+0x475/0x670 [ 30.493607] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.498259] ? lock_downgrade+0x8e0/0x8e0 [ 30.502401] ? handle_mm_fault+0x8c0/0xc70 [ 30.506622] ? handle_mm_fault+0x55a/0xc70 [ 30.510856] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.516378] do_group_exit+0x16f/0x430 [ 30.520252] ? mm_fault_error+0x380/0x380 [ 30.524381] ? __ia32_sys_exit+0x50/0x50 [ 30.528426] ? do_syscall_64+0x92/0x800 [ 30.533268] __x64_sys_exit_group+0x3e/0x50 [ 30.537575] do_syscall_64+0x1b1/0x800 [ 30.541441] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.546274] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.551187] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.556109] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.561456] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.566280] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.571448] RIP: 0033:0x43e918 [ 30.574624] RSP: 002b:00007fffd66edba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.582311] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 30.589561] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.596808] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.604059] R10: 0000000020004000 R11: 0000000000000246 R12: 0000000000000001 [ 30.611312] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.619212] Dumping ftrace buffer: [ 30.622820] (ftrace buffer empty) [ 30.626513] Kernel Offset: disabled [ 30.630122] Rebooting in 86400 seconds..