[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.705273] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.127318] random: sshd: uninitialized urandom read (32 bytes read) [ 24.557804] random: sshd: uninitialized urandom read (32 bytes read) [ 25.321450] random: sshd: uninitialized urandom read (32 bytes read) [ 25.487441] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 31.043348] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.140284] WARNING: CPU: 1 PID: 4518 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.148722] Kernel panic - not syncing: panic_on_warn set ... [ 31.148722] [ 31.156092] CPU: 1 PID: 4518 Comm: syz-executor204 Not tainted 4.17.0-rc4+ #41 [ 31.163458] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.172815] Call Trace: [ 31.175414] dump_stack+0x1b9/0x294 [ 31.179046] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.184267] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.188410] panic+0x22f/0x4de [ 31.191593] ? add_taint.cold.5+0x16/0x16 [ 31.195737] ? __warn.cold.8+0x148/0x1b3 [ 31.199792] ? __warn.cold.8+0x117/0x1b3 [ 31.203855] ? smc_unhash_sk+0x345/0x4a0 [ 31.207907] __warn.cold.8+0x163/0x1b3 [ 31.211810] ? smc_unhash_sk+0x345/0x4a0 [ 31.215857] report_bug+0x252/0x2d0 [ 31.219489] do_error_trap+0x1de/0x490 [ 31.223373] ? graph_lock+0x170/0x170 [ 31.227176] ? math_error+0x420/0x420 [ 31.231152] ? lock_acquire+0x1dc/0x520 [ 31.235121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.239958] do_invalid_op+0x1b/0x20 [ 31.243681] invalid_op+0x14/0x20 [ 31.247136] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.251785] RSP: 0018:ffff8801ace57488 EFLAGS: 00010293 [ 31.257135] RAX: ffff8801d8e70200 RBX: ffff8801aced17c0 RCX: ffffffff87404cbe [ 31.264406] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 31.271686] RBP: ffff8801ace57570 R08: ffff8801d8e70200 R09: ffffed00359da308 [ 31.278946] R10: ffffed00359da308 R11: ffff8801aced1843 R12: 1ffff100359cae95 [ 31.286212] R13: ffff8801ace57548 R14: ffffffff8970cc20 R15: ffff8801aced1840 [ 31.293499] ? smc_unhash_sk+0x28e/0x4a0 [ 31.297569] ? smc_unhash_sk+0x345/0x4a0 [ 31.301621] ? smc_unhash_sk+0x345/0x4a0 [ 31.305671] ? smc_rx_data_available+0x100/0x100 [ 31.310431] ? release_sock+0x1e2/0x2b0 [ 31.314397] ? __local_bh_enable_ip+0x161/0x230 [ 31.319060] ? __release_sock+0x3a0/0x3a0 [ 31.323732] ? smc_release+0x269/0x610 [ 31.327633] ? trace_hardirqs_on+0xd/0x10 [ 31.331783] ? __local_bh_enable_ip+0x161/0x230 [ 31.336452] smc_release+0x36e/0x610 [ 31.340160] sock_release+0x96/0x1b0 [ 31.343975] ? sock_alloc_file+0x4e0/0x4e0 [ 31.348211] sock_close+0x16/0x20 [ 31.351655] __fput+0x34d/0x890 [ 31.354935] ? fput+0x1a0/0x1a0 [ 31.358207] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.362790] ____fput+0x15/0x20 [ 31.366073] task_work_run+0x1e4/0x290 [ 31.369949] ? task_work_cancel+0x240/0x240 [ 31.374261] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.379806] ? switch_task_namespaces+0xa2/0xd0 [ 31.384470] do_exit+0x1aee/0x2730 [ 31.388004] ? mm_update_next_owner+0x980/0x980 [ 31.392670] ? lock_downgrade+0x8e0/0x8e0 [ 31.396803] ? noop_count+0x40/0x40 [ 31.400418] ? lock_pin_lock+0x350/0x350 [ 31.404483] ? kasan_check_read+0x11/0x20 [ 31.408624] ? rcu_is_watching+0x85/0x140 [ 31.412757] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.417972] ? is_bpf_text_address+0xd7/0x170 [ 31.422558] ? check_usage_backwards+0x151/0x3a0 [ 31.427318] ? graph_lock+0x170/0x170 [ 31.431135] ? graph_lock+0x170/0x170 [ 31.434958] ? find_held_lock+0x36/0x1c0 [ 31.439036] ? lock_downgrade+0x8e0/0x8e0 [ 31.443217] ? kasan_check_read+0x11/0x20 [ 31.447371] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.451791] ? __local_bh_enable_ip+0x161/0x230 [ 31.456474] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.461523] ? release_sock+0x1e2/0x2b0 [ 31.465523] ? trace_hardirqs_on+0xd/0x10 [ 31.469683] ? __local_bh_enable_ip+0x161/0x230 [ 31.474357] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.478780] ? release_sock+0x1e2/0x2b0 [ 31.482755] ? __release_sock+0x3a0/0x3a0 [ 31.486923] ? __local_bh_enable_ip+0x161/0x230 [ 31.491597] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.496788] ? smc_setsockopt+0x1ed/0x630 [ 31.500939] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.506473] ? __sys_setsockopt+0x24f/0x390 [ 31.510788] do_group_exit+0x16f/0x430 [ 31.514667] ? mm_fault_error+0x380/0x380 [ 31.518810] ? __ia32_sys_exit+0x50/0x50 [ 31.522867] ? do_syscall_64+0x92/0x800 [ 31.526851] __x64_sys_exit_group+0x3e/0x50 [ 31.531167] do_syscall_64+0x1b1/0x800 [ 31.535047] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.539983] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.544938] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.550313] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.555149] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.560332] RIP: 0033:0x43e8d8 [ 31.563515] RSP: 002b:00007fff625296a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.571213] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.578472] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.585730] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.592991] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.600268] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.608268] Dumping ftrace buffer: [ 31.611959] (ftrace buffer empty) [ 31.615666] Kernel Offset: disabled [ 31.619279] Rebooting in 86400 seconds..