[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.082878] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.432921] random: sshd: uninitialized urandom read (32 bytes read) [ 24.814191] random: sshd: uninitialized urandom read (32 bytes read) [ 25.571011] random: sshd: uninitialized urandom read (32 bytes read) [ 25.731924] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 31.164838] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.260371] WARNING: CPU: 0 PID: 4530 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.268787] Kernel panic - not syncing: panic_on_warn set ... [ 31.268787] [ 31.276145] CPU: 0 PID: 4530 Comm: syz-executor348 Not tainted 4.17.0-rc4+ #41 [ 31.283485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.292823] Call Trace: [ 31.295401] dump_stack+0x1b9/0x294 [ 31.299024] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.304215] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.308262] panic+0x22f/0x4de [ 31.311435] ? add_taint.cold.5+0x16/0x16 [ 31.315569] ? __warn.cold.8+0x148/0x1b3 [ 31.319610] ? __warn.cold.8+0x117/0x1b3 [ 31.323658] ? smc_unhash_sk+0x345/0x4a0 [ 31.327702] __warn.cold.8+0x163/0x1b3 [ 31.331583] ? smc_unhash_sk+0x345/0x4a0 [ 31.335627] report_bug+0x252/0x2d0 [ 31.339240] do_error_trap+0x1de/0x490 [ 31.343114] ? graph_lock+0x170/0x170 [ 31.346899] ? math_error+0x420/0x420 [ 31.350687] ? lock_acquire+0x1dc/0x520 [ 31.354648] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.359478] do_invalid_op+0x1b/0x20 [ 31.363176] invalid_op+0x14/0x20 [ 31.366618] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.371267] RSP: 0018:ffff8801b6dd7488 EFLAGS: 00010293 [ 31.376615] RAX: ffff8801afa2c440 RBX: ffff8801b03797c0 RCX: ffffffff87404cbe [ 31.383867] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 31.391143] RBP: ffff8801b6dd7570 R08: ffff8801afa2c440 R09: ffffed003606f308 [ 31.398395] R10: ffffed003606f308 R11: ffff8801b0379843 R12: 1ffff10036dbae95 [ 31.405646] R13: ffff8801b6dd7548 R14: ffffffff8970cc20 R15: ffff8801b0379840 [ 31.412915] ? smc_unhash_sk+0x28e/0x4a0 [ 31.416957] ? smc_unhash_sk+0x345/0x4a0 [ 31.421005] ? smc_unhash_sk+0x345/0x4a0 [ 31.425066] ? smc_rx_data_available+0x100/0x100 [ 31.429812] ? release_sock+0x1e2/0x2b0 [ 31.433773] ? __local_bh_enable_ip+0x161/0x230 [ 31.438425] ? __release_sock+0x3a0/0x3a0 [ 31.442559] ? smc_release+0x269/0x610 [ 31.446431] ? trace_hardirqs_on+0xd/0x10 [ 31.450562] ? __local_bh_enable_ip+0x161/0x230 [ 31.455229] smc_release+0x36e/0x610 [ 31.458944] sock_release+0x96/0x1b0 [ 31.462641] ? sock_alloc_file+0x4e0/0x4e0 [ 31.466869] sock_close+0x16/0x20 [ 31.470306] __fput+0x34d/0x890 [ 31.473566] ? fput+0x1a0/0x1a0 [ 31.476828] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.481304] ____fput+0x15/0x20 [ 31.484565] task_work_run+0x1e4/0x290 [ 31.488433] ? task_work_cancel+0x240/0x240 [ 31.492743] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.498265] ? switch_task_namespaces+0xa2/0xd0 [ 31.502924] do_exit+0x1aee/0x2730 [ 31.506451] ? mm_update_next_owner+0x980/0x980 [ 31.511111] ? find_held_lock+0x36/0x1c0 [ 31.515160] ? lock_downgrade+0x8e0/0x8e0 [ 31.519295] ? lock_downgrade+0x8e0/0x8e0 [ 31.523433] ? kasan_check_read+0x11/0x20 [ 31.527564] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.531957] ? __local_bh_enable_ip+0x161/0x230 [ 31.536611] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.541615] ? release_sock+0x1e2/0x2b0 [ 31.545576] ? trace_hardirqs_on+0xd/0x10 [ 31.549711] ? __local_bh_enable_ip+0x161/0x230 [ 31.554366] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.558761] ? release_sock+0x1e2/0x2b0 [ 31.562726] ? __release_sock+0x3a0/0x3a0 [ 31.566864] ? __local_bh_enable_ip+0x161/0x230 [ 31.571523] ? lock_sock_nested+0xe7/0x120 [ 31.575759] ? smc_sendmsg+0x2d5/0x370 [ 31.579629] ? smc_sendpage+0x1a0/0x1a0 [ 31.583595] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.589118] ? sock_sendmsg+0x5a/0x120 [ 31.592998] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.598528] ? __sys_sendto+0x475/0x670 [ 31.602491] ? __ia32_sys_getpeername+0xb0/0xb0 [ 31.607152] ? lock_downgrade+0x8e0/0x8e0 [ 31.611287] ? handle_mm_fault+0x8c0/0xc70 [ 31.615511] ? handle_mm_fault+0x55a/0xc70 [ 31.619741] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.625268] do_group_exit+0x16f/0x430 [ 31.629142] ? __ia32_sys_exit+0x50/0x50 [ 31.633192] ? do_syscall_64+0x92/0x800 [ 31.637154] __x64_sys_exit_group+0x3e/0x50 [ 31.641472] do_syscall_64+0x1b1/0x800 [ 31.645348] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.650266] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.655188] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.660539] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.665370] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.670543] RIP: 0033:0x43e8f8 [ 31.673714] RSP: 002b:00007ffec1413688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.681406] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8f8 [ 31.688671] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.695929] RBP: 00000000004be2a0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.703181] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.710434] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.718336] Dumping ftrace buffer: [ 31.722002] (ftrace buffer empty) [ 31.725693] Kernel Offset: disabled [ 31.729304] Rebooting in 86400 seconds..