[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.825047] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.959416] random: sshd: uninitialized urandom read (32 bytes read) [ 23.398918] random: sshd: uninitialized urandom read (32 bytes read) [ 24.188182] random: sshd: uninitialized urandom read (32 bytes read) [ 24.347513] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts. [ 29.781442] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.889767] WARNING: CPU: 0 PID: 4554 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.898166] Kernel panic - not syncing: panic_on_warn set ... [ 29.898166] [ 29.905673] CPU: 0 PID: 4554 Comm: syz-executor828 Not tainted 4.17.0-rc4+ #47 [ 29.913027] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.922368] Call Trace: [ 29.924943] dump_stack+0x1b9/0x294 [ 29.928554] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.933742] ? smc_unhash_sk+0x310/0x4a0 [ 29.937796] panic+0x22f/0x4de [ 29.940983] ? add_taint.cold.5+0x16/0x16 [ 29.945121] ? __warn.cold.8+0x148/0x1b3 [ 29.949164] ? __warn.cold.8+0x117/0x1b3 [ 29.953208] ? smc_unhash_sk+0x345/0x4a0 [ 29.957333] __warn.cold.8+0x163/0x1b3 [ 29.961345] ? smc_unhash_sk+0x345/0x4a0 [ 29.965393] report_bug+0x252/0x2d0 [ 29.969019] do_error_trap+0x1de/0x490 [ 29.972904] ? graph_lock+0x170/0x170 [ 29.976705] ? math_error+0x420/0x420 [ 29.980502] ? lock_acquire+0x1dc/0x520 [ 29.984466] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.989294] do_invalid_op+0x1b/0x20 [ 29.992996] invalid_op+0x14/0x20 [ 29.996446] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.001097] RSP: 0018:ffff8801aba1f488 EFLAGS: 00010293 [ 30.006440] RAX: ffff8801aef840c0 RBX: ffff8801ab9337c0 RCX: ffffffff8740e77e [ 30.013693] RDX: 0000000000000000 RSI: ffffffff8740e835 RDI: 0000000000000005 [ 30.020943] RBP: ffff8801aba1f570 R08: ffff8801aef840c0 R09: ffffed0035726708 [ 30.029037] R10: ffffed0035726708 R11: ffff8801ab933843 R12: 1ffff10035743e95 [ 30.036291] R13: ffff8801aba1f548 R14: ffffffff8970d520 R15: ffff8801ab933840 [ 30.043559] ? smc_unhash_sk+0x28e/0x4a0 [ 30.047638] ? smc_unhash_sk+0x345/0x4a0 [ 30.051694] ? smc_unhash_sk+0x345/0x4a0 [ 30.055757] ? smc_rx_data_available+0x100/0x100 [ 30.060530] ? release_sock+0x1e2/0x2b0 [ 30.064543] ? __local_bh_enable_ip+0x161/0x230 [ 30.069233] ? __release_sock+0x3a0/0x3a0 [ 30.073374] ? smc_release+0x269/0x610 [ 30.077250] ? trace_hardirqs_on+0xd/0x10 [ 30.081418] ? __local_bh_enable_ip+0x161/0x230 [ 30.086092] smc_release+0x36e/0x610 [ 30.089796] sock_release+0x96/0x1b0 [ 30.093510] ? sock_alloc_file+0x4e0/0x4e0 [ 30.097736] sock_close+0x16/0x20 [ 30.101192] __fput+0x34d/0x890 [ 30.104459] ? fput+0x1a0/0x1a0 [ 30.107723] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.112215] ____fput+0x15/0x20 [ 30.115489] task_work_run+0x1e4/0x290 [ 30.119361] ? task_work_cancel+0x240/0x240 [ 30.123669] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.129269] ? switch_task_namespaces+0xa2/0xd0 [ 30.133937] do_exit+0x1aee/0x2730 [ 30.137470] ? mm_update_next_owner+0x980/0x980 [ 30.142143] ? find_held_lock+0x36/0x1c0 [ 30.146191] ? lock_downgrade+0x8e0/0x8e0 [ 30.150324] ? lock_downgrade+0x8e0/0x8e0 [ 30.154469] ? kasan_check_read+0x11/0x20 [ 30.158603] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.163088] ? __local_bh_enable_ip+0x161/0x230 [ 30.167759] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.172765] ? release_sock+0x1e2/0x2b0 [ 30.176857] ? trace_hardirqs_on+0xd/0x10 [ 30.181005] ? __local_bh_enable_ip+0x161/0x230 [ 30.185671] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.190073] ? release_sock+0x1e2/0x2b0 [ 30.194043] ? __release_sock+0x3a0/0x3a0 [ 30.198209] ? __local_bh_enable_ip+0x161/0x230 [ 30.202869] ? lock_sock_nested+0xe7/0x120 [ 30.207093] ? smc_sendmsg+0x2d5/0x370 [ 30.210963] ? smc_sendpage+0x1a0/0x1a0 [ 30.214932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.220453] ? sock_sendmsg+0x5a/0x120 [ 30.224347] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.229889] ? __sys_sendto+0x475/0x670 [ 30.233938] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.238616] ? lock_downgrade+0x8e0/0x8e0 [ 30.242773] ? handle_mm_fault+0x8c0/0xc70 [ 30.247044] ? handle_mm_fault+0x55a/0xc70 [ 30.251306] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.256850] do_group_exit+0x16f/0x430 [ 30.260723] ? mm_fault_error+0x380/0x380 [ 30.264859] ? __ia32_sys_exit+0x50/0x50 [ 30.268953] ? do_syscall_64+0x92/0x800 [ 30.272931] __x64_sys_exit_group+0x3e/0x50 [ 30.277243] do_syscall_64+0x1b1/0x800 [ 30.281116] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.285950] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.290881] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.295820] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.301197] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.306056] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.311240] RIP: 0033:0x43e928 [ 30.314413] RSP: 002b:00007ffe574b6288 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.322119] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e928 [ 30.329377] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.336641] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.343910] R10: fffffffffffffffd R11: 0000000000000246 R12: 0000000000000001 [ 30.351174] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.359075] Dumping ftrace buffer: [ 30.362721] (ftrace buffer empty) [ 30.368713] Kernel Offset: disabled [ 30.372791] Rebooting in 86400 seconds..