[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.848513] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.272913] random: sshd: uninitialized urandom read (32 bytes read) [ 23.815617] random: sshd: uninitialized urandom read (32 bytes read) [ 24.551651] random: sshd: uninitialized urandom read (32 bytes read) [ 24.707540] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 30.192075] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.282806] WARNING: CPU: 0 PID: 4510 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.291204] Kernel panic - not syncing: panic_on_warn set ... [ 30.291204] [ 30.298552] CPU: 0 PID: 4510 Comm: syz-executor098 Not tainted 4.17.0-rc2+ #32 [ 30.305887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.315227] Call Trace: [ 30.317810] dump_stack+0x1b9/0x294 [ 30.321437] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.326616] ? smc_unhash_sk+0x2f0/0x4a0 [ 30.330659] panic+0x22f/0x4de [ 30.333840] ? add_taint.cold.5+0x16/0x16 [ 30.337972] ? __warn.cold.8+0x148/0x1b3 [ 30.342016] ? __warn.cold.8+0x117/0x1b3 [ 30.346066] ? smc_unhash_sk+0x345/0x4a0 [ 30.350106] __warn.cold.8+0x163/0x1b3 [ 30.353974] ? smc_unhash_sk+0x345/0x4a0 [ 30.358024] report_bug+0x252/0x2d0 [ 30.361636] do_error_trap+0x1de/0x490 [ 30.365504] ? graph_lock+0x170/0x170 [ 30.369301] ? math_error+0x420/0x420 [ 30.373117] ? lock_acquire+0x1dc/0x520 [ 30.377121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.381974] do_invalid_op+0x1b/0x20 [ 30.385670] invalid_op+0x14/0x20 [ 30.389116] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.393768] RSP: 0018:ffff8801b0987488 EFLAGS: 00010293 [ 30.399120] RAX: ffff8801ae7c4300 RBX: ffff8801ac4e07c0 RCX: ffffffff873fce9e [ 30.406368] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 30.413624] RBP: ffff8801b0987570 R08: ffff8801ae7c4300 R09: ffffed003589c108 [ 30.420884] R10: ffffed003589c108 R11: ffff8801ac4e0843 R12: 1ffff10036130e95 [ 30.428136] R13: ffff8801b0987548 R14: ffffffff8970e060 R15: ffff8801ac4e0840 [ 30.435500] ? smc_unhash_sk+0x28e/0x4a0 [ 30.439549] ? smc_unhash_sk+0x345/0x4a0 [ 30.443601] ? smc_unhash_sk+0x345/0x4a0 [ 30.447644] ? smc_hash_sk+0x2f0/0x2f0 [ 30.451514] ? release_sock+0x1e2/0x2b0 [ 30.455471] ? __local_bh_enable_ip+0x161/0x230 [ 30.460121] ? __release_sock+0x3a0/0x3a0 [ 30.464251] ? smc_release+0x269/0x610 [ 30.468380] ? trace_hardirqs_on+0xd/0x10 [ 30.472507] ? __local_bh_enable_ip+0x161/0x230 [ 30.477160] smc_release+0x36e/0x610 [ 30.480857] sock_release+0x96/0x1b0 [ 30.484553] ? sock_alloc_file+0x4e0/0x4e0 [ 30.488767] sock_close+0x16/0x20 [ 30.492202] __fput+0x34d/0x890 [ 30.495464] ? fput+0x1a0/0x1a0 [ 30.498724] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.503201] ____fput+0x15/0x20 [ 30.506460] task_work_run+0x1e4/0x290 [ 30.510328] ? task_work_cancel+0x240/0x240 [ 30.514632] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.520150] ? switch_task_namespaces+0xa2/0xd0 [ 30.524802] do_exit+0x1aee/0x2730 [ 30.528326] ? mm_update_next_owner+0x980/0x980 [ 30.532974] ? lock_downgrade+0x8e0/0x8e0 [ 30.537102] ? noop_count+0x40/0x40 [ 30.540708] ? lock_pin_lock+0x350/0x350 [ 30.544751] ? kasan_check_read+0x11/0x20 [ 30.548879] ? rcu_is_watching+0x85/0x140 [ 30.553024] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.558213] ? is_bpf_text_address+0xd7/0x170 [ 30.562690] ? check_usage_backwards+0x151/0x3a0 [ 30.567435] ? graph_lock+0x170/0x170 [ 30.571225] ? graph_lock+0x170/0x170 [ 30.575018] ? find_held_lock+0x36/0x1c0 [ 30.579077] ? lock_downgrade+0x8e0/0x8e0 [ 30.583209] ? kasan_check_read+0x11/0x20 [ 30.587338] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.591728] ? __local_bh_enable_ip+0x161/0x230 [ 30.596378] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.601377] ? release_sock+0x1e2/0x2b0 [ 30.605329] ? trace_hardirqs_on+0xd/0x10 [ 30.609459] ? __local_bh_enable_ip+0x161/0x230 [ 30.614107] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.618506] ? release_sock+0x1e2/0x2b0 [ 30.622461] ? __release_sock+0x3a0/0x3a0 [ 30.626589] ? __local_bh_enable_ip+0x161/0x230 [ 30.631242] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.636414] ? smc_setsockopt+0x1ed/0x630 [ 30.640545] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.646063] ? __sys_setsockopt+0x24f/0x390 [ 30.650367] do_group_exit+0x16f/0x430 [ 30.654234] ? mm_fault_error+0x380/0x380 [ 30.658362] ? __ia32_sys_exit+0x50/0x50 [ 30.662406] ? do_syscall_64+0x92/0x800 [ 30.666363] __x64_sys_exit_group+0x3e/0x50 [ 30.670663] do_syscall_64+0x1b1/0x800 [ 30.674530] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.679354] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.684266] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.689182] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.694528] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.699364] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.704534] RIP: 0033:0x43e8d8 [ 30.707718] RSP: 002b:00007ffd60de4588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.715407] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.722656] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.729903] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.737153] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 30.744401] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.752236] Dumping ftrace buffer: [ 30.755872] (ftrace buffer empty) [ 30.759563] Kernel Offset: disabled [ 30.763170] Rebooting in 86400 seconds..