[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.161770] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.164608] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.556072] random: sshd: uninitialized urandom read (32 bytes read) [ 22.294961] random: sshd: uninitialized urandom read (32 bytes read) [ 22.450609] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 27.924686] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.028406] WARNING: CPU: 0 PID: 4479 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.036795] Kernel panic - not syncing: panic_on_warn set ... [ 28.036795] [ 28.044150] CPU: 0 PID: 4479 Comm: syz-executor534 Not tainted 4.17.0-rc2+ #27 [ 28.051486] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.060837] Call Trace: [ 28.063417] dump_stack+0x1b9/0x294 [ 28.067037] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.072226] ? smc_unhash_sk+0x260/0x4a0 [ 28.076271] panic+0x22f/0x4de [ 28.079443] ? add_taint.cold.5+0x16/0x16 [ 28.083573] ? __warn.cold.8+0x148/0x1b3 [ 28.087612] ? __warn.cold.8+0x117/0x1b3 [ 28.091664] ? smc_unhash_sk+0x345/0x4a0 [ 28.095704] __warn.cold.8+0x163/0x1b3 [ 28.099572] ? smc_unhash_sk+0x345/0x4a0 [ 28.103616] report_bug+0x252/0x2d0 [ 28.107225] do_error_trap+0x1de/0x490 [ 28.111094] ? graph_lock+0x170/0x170 [ 28.114877] ? math_error+0x420/0x420 [ 28.118672] ? lock_acquire+0x1dc/0x520 [ 28.122630] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.127454] do_invalid_op+0x1b/0x20 [ 28.131148] invalid_op+0x14/0x20 [ 28.134591] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.139235] RSP: 0018:ffff8801aed17488 EFLAGS: 00010293 [ 28.144579] RAX: ffff8801aec84480 RBX: ffff8801aecd37c0 RCX: ffffffff873faf2e [ 28.151828] RDX: 0000000000000000 RSI: ffffffff873fafe5 RDI: 0000000000000005 [ 28.159079] RBP: ffff8801aed17570 R08: ffff8801aec84480 R09: ffffed0035d9a708 [ 28.166327] R10: ffffed0035d9a708 R11: ffff8801aecd3843 R12: 1ffff10035da2e95 [ 28.173579] R13: ffff8801aed17548 R14: ffffffff8970df20 R15: ffff8801aecd3840 [ 28.180842] ? smc_unhash_sk+0x28e/0x4a0 [ 28.184885] ? smc_unhash_sk+0x345/0x4a0 [ 28.188926] ? smc_unhash_sk+0x345/0x4a0 [ 28.192967] ? smc_hash_sk+0x2f0/0x2f0 [ 28.196839] ? release_sock+0x1e2/0x2b0 [ 28.200795] ? __local_bh_enable_ip+0x161/0x230 [ 28.205449] ? __release_sock+0x3a0/0x3a0 [ 28.209577] ? smc_release+0x269/0x610 [ 28.213466] ? trace_hardirqs_on+0xd/0x10 [ 28.217603] ? __local_bh_enable_ip+0x161/0x230 [ 28.222257] smc_release+0x36e/0x610 [ 28.225957] sock_release+0x96/0x1b0 [ 28.229650] ? sock_alloc_file+0x4e0/0x4e0 [ 28.233866] sock_close+0x16/0x20 [ 28.237302] __fput+0x34d/0x890 [ 28.240569] ? fput+0x1a0/0x1a0 [ 28.243833] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.248325] ____fput+0x15/0x20 [ 28.251589] task_work_run+0x1e4/0x290 [ 28.255458] ? task_work_cancel+0x240/0x240 [ 28.259765] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.265285] ? switch_task_namespaces+0xa2/0xd0 [ 28.269940] do_exit+0x1aee/0x2730 [ 28.273490] ? mm_update_next_owner+0x980/0x980 [ 28.278151] ? lock_downgrade+0x8e0/0x8e0 [ 28.282276] ? noop_count+0x40/0x40 [ 28.285882] ? lock_pin_lock+0x350/0x350 [ 28.289928] ? kasan_check_read+0x11/0x20 [ 28.294058] ? rcu_is_watching+0x85/0x140 [ 28.298186] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.303359] ? is_bpf_text_address+0xd7/0x170 [ 28.307839] ? check_usage_backwards+0x151/0x3a0 [ 28.312576] ? graph_lock+0x170/0x170 [ 28.316356] ? graph_lock+0x170/0x170 [ 28.320145] ? find_held_lock+0x36/0x1c0 [ 28.324194] ? lock_downgrade+0x8e0/0x8e0 [ 28.328328] ? kasan_check_read+0x11/0x20 [ 28.332457] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.336851] ? __local_bh_enable_ip+0x161/0x230 [ 28.341506] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.346505] ? release_sock+0x1e2/0x2b0 [ 28.350462] ? trace_hardirqs_on+0xd/0x10 [ 28.354590] ? __local_bh_enable_ip+0x161/0x230 [ 28.359239] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.363637] ? release_sock+0x1e2/0x2b0 [ 28.367592] ? __release_sock+0x3a0/0x3a0 [ 28.371737] ? __local_bh_enable_ip+0x161/0x230 [ 28.376387] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.381557] ? smc_setsockopt+0x1ed/0x630 [ 28.385687] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.391206] ? __sys_setsockopt+0x24f/0x390 [ 28.395512] do_group_exit+0x16f/0x430 [ 28.399380] ? mm_fault_error+0x380/0x380 [ 28.403508] ? __ia32_sys_exit+0x50/0x50 [ 28.407552] ? do_syscall_64+0x92/0x800 [ 28.411509] __x64_sys_exit_group+0x3e/0x50 [ 28.415813] do_syscall_64+0x1b1/0x800 [ 28.419682] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.424601] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.429522] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.434871] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.439696] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.444865] RIP: 0033:0x43e8d8 [ 28.448126] RSP: 002b:00007ffe58d20e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.455815] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 28.463076] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.470328] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.477578] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 28.484827] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.492721] Dumping ftrace buffer: [ 28.496331] (ftrace buffer empty) [ 28.500018] Kernel Offset: disabled [ 28.503626] Rebooting in 86400 seconds..