[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.934758] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.953330] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.240957] random: sshd: uninitialized urandom read (32 bytes read) [ 22.070186] random: sshd: uninitialized urandom read (32 bytes read) [ 47.266215] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 52.754645] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 52.851249] WARNING: CPU: 1 PID: 4544 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 52.859665] Kernel panic - not syncing: panic_on_warn set ... [ 52.859665] [ 52.867020] CPU: 1 PID: 4544 Comm: syz-executor797 Not tainted 4.17.0-rc4+ #54 [ 52.874382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.883730] Call Trace: [ 52.886311] dump_stack+0x1b9/0x294 [ 52.889922] ? dump_stack_print_info.cold.2+0x52/0x52 [ 52.895102] ? smc_unhash_sk+0x260/0x4a0 [ 52.899147] panic+0x22f/0x4de [ 52.902324] ? add_taint.cold.5+0x16/0x16 [ 52.906462] ? __warn.cold.8+0x148/0x1b3 [ 52.910507] ? __warn.cold.8+0x117/0x1b3 [ 52.914558] ? smc_unhash_sk+0x345/0x4a0 [ 52.918603] __warn.cold.8+0x163/0x1b3 [ 52.922474] ? smc_unhash_sk+0x345/0x4a0 [ 52.926520] report_bug+0x252/0x2d0 [ 52.930135] do_error_trap+0x1de/0x490 [ 52.934010] ? graph_lock+0x170/0x170 [ 52.937793] ? math_error+0x420/0x420 [ 52.941581] ? lock_acquire+0x1dc/0x520 [ 52.945540] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.950365] do_invalid_op+0x1b/0x20 [ 52.954062] invalid_op+0x14/0x20 [ 52.957500] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 52.962143] RSP: 0018:ffff8801ad7d7488 EFLAGS: 00010293 [ 52.967490] RAX: ffff8801d8d2a640 RBX: ffff8801d8c7a7c0 RCX: ffffffff8740fb2e [ 52.974746] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 52.981999] RBP: ffff8801ad7d7570 R08: ffff8801d8d2a640 R09: ffffed003b18f508 [ 52.989254] R10: ffffed003b18f508 R11: ffff8801d8c7a843 R12: 1ffff10035afae95 [ 52.996508] R13: ffff8801ad7d7548 R14: ffffffff8970dc60 R15: ffff8801d8c7a840 [ 53.003781] ? smc_unhash_sk+0x28e/0x4a0 [ 53.007833] ? smc_unhash_sk+0x345/0x4a0 [ 53.011881] ? smc_unhash_sk+0x345/0x4a0 [ 53.015934] ? smc_rx_data_available+0x100/0x100 [ 53.020678] ? release_sock+0x1e2/0x2b0 [ 53.024636] ? __local_bh_enable_ip+0x161/0x230 [ 53.029287] ? __release_sock+0x3a0/0x3a0 [ 53.033418] ? smc_release+0x269/0x610 [ 53.037287] ? trace_hardirqs_on+0xd/0x10 [ 53.041418] ? __local_bh_enable_ip+0x161/0x230 [ 53.046073] smc_release+0x36e/0x610 [ 53.049777] sock_release+0x96/0x1b0 [ 53.053475] ? sock_alloc_file+0x4e0/0x4e0 [ 53.057694] sock_close+0x16/0x20 [ 53.061138] __fput+0x34d/0x890 [ 53.064406] ? fput+0x1a0/0x1a0 [ 53.067674] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.072154] ____fput+0x15/0x20 [ 53.075418] task_work_run+0x1e4/0x290 [ 53.079291] ? task_work_cancel+0x240/0x240 [ 53.083609] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.089131] ? switch_task_namespaces+0xa2/0xd0 [ 53.093789] do_exit+0x1aee/0x2730 [ 53.097323] ? mm_update_next_owner+0x980/0x980 [ 53.101984] ? kasan_check_read+0x11/0x20 [ 53.106123] ? do_raw_spin_unlock+0x9e/0x2e0 [ 53.110522] ? __local_bh_enable_ip+0x161/0x230 [ 53.115178] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.120181] ? release_sock+0x1e2/0x2b0 [ 53.124140] ? trace_hardirqs_on+0xd/0x10 [ 53.128275] ? __local_bh_enable_ip+0x161/0x230 [ 53.132930] ? _raw_spin_unlock_bh+0x30/0x40 [ 53.137334] ? kasan_check_read+0x11/0x20 [ 53.141479] ? rcu_is_watching+0x85/0x140 [ 53.145610] ? rcu_pm_notify+0xc0/0xc0 [ 53.149487] ? ___sys_sendmsg+0x31a/0x940 [ 53.153621] ? kfree+0x1e9/0x260 [ 53.156974] ? ___sys_sendmsg+0x31f/0x940 [ 53.161122] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.166648] ? copy_msghdr_from_user+0x560/0x560 [ 53.171391] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 53.176134] ? graph_lock+0x170/0x170 [ 53.179933] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.185459] ? __fget_light+0x2ef/0x430 [ 53.189421] ? find_held_lock+0x36/0x1c0 [ 53.193478] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.199004] ? sockfd_lookup_light+0xc5/0x160 [ 53.203495] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.209025] ? __sys_sendmsg+0x1aa/0x270 [ 53.213073] ? __ia32_sys_shutdown+0x80/0x80 [ 53.217467] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.222992] ? __do_page_fault+0x441/0xe40 [ 53.227214] do_group_exit+0x16f/0x430 [ 53.231085] ? __ia32_sys_exit+0x50/0x50 [ 53.235133] ? do_syscall_64+0x92/0x800 [ 53.239095] __x64_sys_exit_group+0x3e/0x50 [ 53.243399] do_syscall_64+0x1b1/0x800 [ 53.247274] ? syscall_return_slowpath+0x5c0/0x5c0 [ 53.252190] ? syscall_return_slowpath+0x30f/0x5c0 [ 53.257127] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 53.262483] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.267322] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.272513] RIP: 0033:0x43ea98 [ 53.275701] RSP: 002b:00007ffc4b498398 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 53.283396] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea98 [ 53.290650] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 53.297907] RBP: 00000000004be440 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 53.305161] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 53.312416] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 53.320274] Dumping ftrace buffer: [ 53.323924] (ftrace buffer empty) [ 53.327619] Kernel Offset: disabled [ 53.331234] Rebooting in 86400 seconds..