[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.523481] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.341393] random: sshd: uninitialized urandom read (32 bytes read) [ 21.709901] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.423046] random: sshd: uninitialized urandom read (32 bytes read) [ 30.826597] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. [ 36.260316] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.351465] WARNING: CPU: 1 PID: 4497 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 36.359888] Kernel panic - not syncing: panic_on_warn set ... [ 36.359888] [ 36.367248] CPU: 1 PID: 4497 Comm: syz-executor452 Not tainted 4.17.0-rc3+ #33 [ 36.374590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.383928] Call Trace: [ 36.386514] dump_stack+0x1b9/0x294 [ 36.390129] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.395327] ? smc_unhash_sk+0x270/0x4a0 [ 36.399399] panic+0x22f/0x4de [ 36.402615] ? add_taint.cold.5+0x16/0x16 [ 36.406774] ? __warn.cold.8+0x148/0x1b3 [ 36.410818] ? __warn.cold.8+0x117/0x1b3 [ 36.414869] ? smc_unhash_sk+0x345/0x4a0 [ 36.418918] __warn.cold.8+0x163/0x1b3 [ 36.422802] ? smc_unhash_sk+0x345/0x4a0 [ 36.426859] report_bug+0x252/0x2d0 [ 36.430471] do_error_trap+0x1de/0x490 [ 36.434340] ? graph_lock+0x170/0x170 [ 36.438124] ? math_error+0x420/0x420 [ 36.441927] ? lock_acquire+0x1dc/0x520 [ 36.445896] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.450720] do_invalid_op+0x1b/0x20 [ 36.454422] invalid_op+0x14/0x20 [ 36.457856] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 36.462503] RSP: 0018:ffff8801ae3e7488 EFLAGS: 00010293 [ 36.467846] RAX: ffff8801addd2240 RBX: ffff8801aea007c0 RCX: ffffffff873fe71e [ 36.475099] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 36.482359] RBP: ffff8801ae3e7570 R08: ffff8801addd2240 R09: ffffed0035d40108 [ 36.489609] R10: ffffed0035d40108 R11: ffff8801aea00843 R12: 1ffff10035c7ce95 [ 36.496862] R13: ffff8801ae3e7548 R14: ffffffff8970e4e0 R15: ffff8801aea00840 [ 36.504120] ? smc_unhash_sk+0x28e/0x4a0 [ 36.508163] ? smc_unhash_sk+0x345/0x4a0 [ 36.512207] ? smc_unhash_sk+0x345/0x4a0 [ 36.516268] ? smc_rx_data_available+0x100/0x100 [ 36.521006] ? release_sock+0x1e2/0x2b0 [ 36.524974] ? __local_bh_enable_ip+0x161/0x230 [ 36.529647] ? __release_sock+0x3a0/0x3a0 [ 36.533785] ? smc_release+0x269/0x610 [ 36.537651] ? trace_hardirqs_on+0xd/0x10 [ 36.541781] ? __local_bh_enable_ip+0x161/0x230 [ 36.546433] smc_release+0x36e/0x610 [ 36.550129] sock_release+0x96/0x1b0 [ 36.553823] ? sock_alloc_file+0x4e0/0x4e0 [ 36.558040] sock_close+0x16/0x20 [ 36.561476] __fput+0x34d/0x890 [ 36.564739] ? fput+0x1a0/0x1a0 [ 36.568000] ? _raw_spin_unlock_irq+0x27/0x70 [ 36.572478] ____fput+0x15/0x20 [ 36.575741] task_work_run+0x1e4/0x290 [ 36.579612] ? task_work_cancel+0x240/0x240 [ 36.583917] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.589434] ? switch_task_namespaces+0xa2/0xd0 [ 36.594086] do_exit+0x1aee/0x2730 [ 36.597613] ? mm_update_next_owner+0x980/0x980 [ 36.602263] ? lock_downgrade+0x8e0/0x8e0 [ 36.606390] ? noop_count+0x40/0x40 [ 36.610000] ? lock_pin_lock+0x350/0x350 [ 36.614048] ? kasan_check_read+0x11/0x20 [ 36.618181] ? rcu_is_watching+0x85/0x140 [ 36.622310] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 36.627498] ? is_bpf_text_address+0xd7/0x170 [ 36.631978] ? check_usage_backwards+0x151/0x3a0 [ 36.636712] ? graph_lock+0x170/0x170 [ 36.640493] ? graph_lock+0x170/0x170 [ 36.644283] ? find_held_lock+0x36/0x1c0 [ 36.648332] ? lock_downgrade+0x8e0/0x8e0 [ 36.652474] ? kasan_check_read+0x11/0x20 [ 36.656604] ? do_raw_spin_unlock+0x9e/0x2e0 [ 36.660993] ? __local_bh_enable_ip+0x161/0x230 [ 36.665644] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.670643] ? release_sock+0x1e2/0x2b0 [ 36.674596] ? trace_hardirqs_on+0xd/0x10 [ 36.678724] ? __local_bh_enable_ip+0x161/0x230 [ 36.683375] ? _raw_spin_unlock_bh+0x30/0x40 [ 36.687764] ? release_sock+0x1e2/0x2b0 [ 36.691721] ? __release_sock+0x3a0/0x3a0 [ 36.695852] ? __local_bh_enable_ip+0x161/0x230 [ 36.700504] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 36.705678] ? smc_setsockopt+0x1ed/0x630 [ 36.709821] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.715351] ? __sys_setsockopt+0x24f/0x390 [ 36.719658] do_group_exit+0x16f/0x430 [ 36.723527] ? mm_fault_error+0x380/0x380 [ 36.727668] ? __ia32_sys_exit+0x50/0x50 [ 36.731723] ? do_syscall_64+0x92/0x800 [ 36.735679] __x64_sys_exit_group+0x3e/0x50 [ 36.739993] do_syscall_64+0x1b1/0x800 [ 36.743873] ? syscall_return_slowpath+0x5c0/0x5c0 [ 36.748788] ? syscall_return_slowpath+0x30f/0x5c0 [ 36.753713] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.759072] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.763900] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.769091] RIP: 0033:0x43e8b8 [ 36.772262] RSP: 002b:00007ffe7a701a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 36.779951] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 36.787202] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 36.794457] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 36.801985] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 36.809244] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 36.817242] Dumping ftrace buffer: [ 36.820877] (ftrace buffer empty) [ 36.824571] Kernel Offset: disabled [ 36.828185] Rebooting in 86400 seconds..