[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.720045] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.779853] random: sshd: uninitialized urandom read (32 bytes read) [ 20.971261] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.713777] random: sshd: uninitialized urandom read (32 bytes read) [ 22.258129] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 27.682099] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.774350] WARNING: CPU: 1 PID: 4525 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.782738] Kernel panic - not syncing: panic_on_warn set ... [ 27.782738] [ 27.790087] CPU: 1 PID: 4525 Comm: syz-executor746 Not tainted 4.17.0-rc6+ #57 [ 27.797420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.806757] Call Trace: [ 27.809329] dump_stack+0x1b9/0x294 [ 27.812939] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.818113] ? smc_unhash_sk+0x280/0x4a0 [ 27.822166] panic+0x22f/0x4de [ 27.825350] ? add_taint.cold.5+0x16/0x16 [ 27.829483] ? __warn.cold.8+0x148/0x1b3 [ 27.833524] ? __warn.cold.8+0x117/0x1b3 [ 27.837568] ? smc_unhash_sk+0x345/0x4a0 [ 27.841608] __warn.cold.8+0x163/0x1b3 [ 27.845476] ? smc_unhash_sk+0x345/0x4a0 [ 27.849519] report_bug+0x252/0x2d0 [ 27.853129] do_error_trap+0x1de/0x490 [ 27.856994] ? graph_lock+0x170/0x170 [ 27.860784] ? math_error+0x420/0x420 [ 27.864568] ? lock_acquire+0x1dc/0x520 [ 27.868525] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.873348] do_invalid_op+0x1b/0x20 [ 27.877056] invalid_op+0x14/0x20 [ 27.880490] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.885134] RSP: 0018:ffff8801ad657488 EFLAGS: 00010293 [ 27.890477] RAX: ffff8801ad178700 RBX: ffff8801ad7607c0 RCX: ffffffff87414a0e [ 27.898211] RDX: 0000000000000000 RSI: ffffffff87414ac5 RDI: 0000000000000005 [ 27.905464] RBP: ffff8801ad657570 R08: ffff8801ad178700 R09: ffffed0035aec108 [ 27.912716] R10: ffffed0035aec108 R11: ffff8801ad760843 R12: 1ffff10035acae95 [ 27.919965] R13: ffff8801ad657548 R14: ffffffff8970d9e0 R15: ffff8801ad760840 [ 27.927230] ? smc_unhash_sk+0x28e/0x4a0 [ 27.931271] ? smc_unhash_sk+0x345/0x4a0 [ 27.935316] ? smc_unhash_sk+0x345/0x4a0 [ 27.939359] ? smc_rx_data_available+0x100/0x100 [ 27.944094] ? release_sock+0x1e2/0x2b0 [ 27.948052] ? __local_bh_enable_ip+0x161/0x230 [ 27.952700] ? __release_sock+0x3a0/0x3a0 [ 27.956836] ? smc_release+0x269/0x610 [ 27.960704] ? trace_hardirqs_on+0xd/0x10 [ 27.964831] ? __local_bh_enable_ip+0x161/0x230 [ 27.969481] smc_release+0x36e/0x610 [ 27.973180] sock_release+0x96/0x1b0 [ 27.976879] ? sock_alloc_file+0x4e0/0x4e0 [ 27.981093] sock_close+0x16/0x20 [ 27.984527] __fput+0x34d/0x890 [ 27.987789] ? fput+0x1a0/0x1a0 [ 27.991055] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.995531] ____fput+0x15/0x20 [ 27.998806] task_work_run+0x1e4/0x290 [ 28.002674] ? task_work_cancel+0x240/0x240 [ 28.006979] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.012498] ? switch_task_namespaces+0xa2/0xd0 [ 28.017151] do_exit+0x1aee/0x2730 [ 28.020672] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.025074] ? mm_update_next_owner+0x980/0x980 [ 28.029726] ? ___sys_sendmsg+0x31a/0x940 [ 28.033853] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.038849] ? kfree+0x1e9/0x260 [ 28.042203] ? ___sys_sendmsg+0x31f/0x940 [ 28.046333] ? copy_msghdr_from_user+0x560/0x560 [ 28.051071] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.056072] ? graph_lock+0x170/0x170 [ 28.059852] ? pud_val+0x80/0xf0 [ 28.063206] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.068722] ? __fget_light+0x2ef/0x430 [ 28.072674] ? __handle_mm_fault+0x93a/0x4310 [ 28.077151] ? fget_raw+0x20/0x20 [ 28.080584] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 28.085325] ? graph_lock+0x170/0x170 [ 28.089112] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.094636] ? sockfd_lookup_light+0xc5/0x160 [ 28.099115] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.104636] ? __sys_sendmmsg+0x4b3/0x6f0 [ 28.108766] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 28.113068] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.118589] ? __handle_mm_fault+0x4310/0x4310 [ 28.123165] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.128680] ? __do_page_fault+0x441/0xe40 [ 28.132900] do_group_exit+0x16f/0x430 [ 28.136765] ? mm_fault_error+0x380/0x380 [ 28.140892] ? __ia32_sys_exit+0x50/0x50 [ 28.144937] ? do_syscall_64+0x92/0x800 [ 28.148894] __x64_sys_exit_group+0x3e/0x50 [ 28.153196] do_syscall_64+0x1b1/0x800 [ 28.157075] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.161987] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.166903] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.172250] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.177073] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.182242] RIP: 0033:0x43f218 [ 28.185412] RSP: 002b:00007ffe937a53e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.193104] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f218 [ 28.200352] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.207603] RBP: 00000000004bebc0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.214852] R10: 0000000020040800 R11: 0000000000000246 R12: 0000000000000001 [ 28.222116] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.230002] Dumping ftrace buffer: [ 28.233617] (ftrace buffer empty) [ 28.237305] Kernel Offset: disabled [ 28.240912] Rebooting in 86400 seconds..