[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.355322] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.668135] random: sshd: uninitialized urandom read (32 bytes read) [ 23.046498] random: sshd: uninitialized urandom read (32 bytes read) [ 23.807595] random: sshd: uninitialized urandom read (32 bytes read) [ 23.967510] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 29.414284] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.507521] WARNING: CPU: 1 PID: 4509 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.515912] Kernel panic - not syncing: panic_on_warn set ... [ 29.515912] [ 29.523259] CPU: 1 PID: 4509 Comm: syz-executor377 Not tainted 4.17.0-rc6+ #61 [ 29.530600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.539940] Call Trace: [ 29.542514] dump_stack+0x1b9/0x294 [ 29.546123] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.551298] ? smc_unhash_sk+0x310/0x4a0 [ 29.555341] panic+0x22f/0x4de [ 29.558517] ? add_taint.cold.5+0x16/0x16 [ 29.562652] ? __warn.cold.8+0x148/0x1b3 [ 29.566692] ? __warn.cold.8+0x117/0x1b3 [ 29.570734] ? smc_unhash_sk+0x345/0x4a0 [ 29.574775] __warn.cold.8+0x163/0x1b3 [ 29.578656] ? smc_unhash_sk+0x345/0x4a0 [ 29.582701] report_bug+0x252/0x2d0 [ 29.586314] do_error_trap+0x1de/0x490 [ 29.590180] ? graph_lock+0x170/0x170 [ 29.593963] ? math_error+0x420/0x420 [ 29.597748] ? lock_acquire+0x1dc/0x520 [ 29.601705] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.606529] do_invalid_op+0x1b/0x20 [ 29.610228] invalid_op+0x14/0x20 [ 29.613666] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.618325] RSP: 0018:ffff8801b1577488 EFLAGS: 00010293 [ 29.623666] RAX: ffff8801af2501c0 RBX: ffff8801ad0f87c0 RCX: ffffffff8742137e [ 29.630914] RDX: 0000000000000000 RSI: ffffffff87421435 RDI: 0000000000000005 [ 29.638161] RBP: ffff8801b1577570 R08: ffff8801af2501c0 R09: ffffed0035a1f108 [ 29.645415] R10: ffffed0035a1f108 R11: ffff8801ad0f8843 R12: 1ffff100362aee95 [ 29.652673] R13: ffff8801b1577548 R14: ffffffff8970e2a0 R15: ffff8801ad0f8840 [ 29.659949] ? smc_unhash_sk+0x28e/0x4a0 [ 29.663995] ? smc_unhash_sk+0x345/0x4a0 [ 29.668053] ? smc_unhash_sk+0x345/0x4a0 [ 29.672107] ? smc_rx_data_available+0x100/0x100 [ 29.676852] ? release_sock+0x1e2/0x2b0 [ 29.680810] ? __local_bh_enable_ip+0x161/0x230 [ 29.685458] ? __release_sock+0x3a0/0x3a0 [ 29.689588] ? smc_release+0x269/0x610 [ 29.693457] ? trace_hardirqs_on+0xd/0x10 [ 29.697587] ? __local_bh_enable_ip+0x161/0x230 [ 29.702243] smc_release+0x36e/0x610 [ 29.705948] sock_release+0x96/0x1b0 [ 29.709648] ? sock_alloc_file+0x4e0/0x4e0 [ 29.713864] sock_close+0x16/0x20 [ 29.717301] __fput+0x34d/0x890 [ 29.720563] ? fput+0x1a0/0x1a0 [ 29.723825] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.728311] ____fput+0x15/0x20 [ 29.731581] task_work_run+0x1e4/0x290 [ 29.735454] ? task_work_cancel+0x240/0x240 [ 29.739759] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.745275] ? switch_task_namespaces+0xa2/0xd0 [ 29.749932] do_exit+0x1aee/0x2730 [ 29.753456] ? mm_update_next_owner+0x980/0x980 [ 29.758111] ? ___sys_sendmsg+0x31a/0x940 [ 29.762251] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.767261] ? kfree+0x1e9/0x260 [ 29.770618] ? ___sys_sendmsg+0x31f/0x940 [ 29.774758] ? copy_msghdr_from_user+0x560/0x560 [ 29.779498] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.784512] ? graph_lock+0x170/0x170 [ 29.788298] ? pud_val+0x80/0xf0 [ 29.791650] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.797169] ? __fget_light+0x2ef/0x430 [ 29.801125] ? __handle_mm_fault+0x93a/0x4310 [ 29.805600] ? fget_raw+0x20/0x20 [ 29.809048] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 29.813793] ? graph_lock+0x170/0x170 [ 29.817577] ? graph_lock+0x170/0x170 [ 29.821367] ? find_held_lock+0x36/0x1c0 [ 29.825422] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.830944] ? sockfd_lookup_light+0xc5/0x160 [ 29.835431] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.840948] ? __sys_sendmmsg+0x4b3/0x6f0 [ 29.845086] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 29.849396] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.854943] ? __handle_mm_fault+0x4310/0x4310 [ 29.859522] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.865058] ? __do_page_fault+0x441/0xe40 [ 29.869284] do_group_exit+0x16f/0x430 [ 29.873152] ? mm_fault_error+0x380/0x380 [ 29.877290] ? __ia32_sys_exit+0x50/0x50 [ 29.881337] ? do_syscall_64+0x92/0x800 [ 29.885294] __x64_sys_exit_group+0x3e/0x50 [ 29.889596] do_syscall_64+0x1b1/0x800 [ 29.893466] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.898381] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.903296] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.908642] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.913476] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.918655] RIP: 0033:0x43e998 [ 29.921832] RSP: 002b:00007fffea807bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.929526] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e998 [ 29.936785] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.944047] RBP: 00000000004be340 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.951307] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.958557] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.966386] Dumping ftrace buffer: [ 29.969991] (ftrace buffer empty) [ 29.973680] Kernel Offset: disabled [ 29.977286] Rebooting in 86400 seconds..