[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.419486] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.015904] random: sshd: uninitialized urandom read (32 bytes read) [ 21.256157] random: sshd: uninitialized urandom read (32 bytes read) [ 21.975551] random: sshd: uninitialized urandom read (32 bytes read) [ 22.158251] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. [ 27.648835] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.742284] WARNING: CPU: 0 PID: 4464 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.750682] Kernel panic - not syncing: panic_on_warn set ... [ 27.750682] [ 27.758039] CPU: 0 PID: 4464 Comm: syz-executor245 Not tainted 4.17.0-rc3+ #34 [ 27.765381] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.774711] Call Trace: [ 27.777281] dump_stack+0x1b9/0x294 [ 27.780890] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.786062] ? smc_unhash_sk+0x310/0x4a0 [ 27.790109] panic+0x22f/0x4de [ 27.793280] ? add_taint.cold.5+0x16/0x16 [ 27.797408] ? __warn.cold.8+0x148/0x1b3 [ 27.801453] ? __warn.cold.8+0x117/0x1b3 [ 27.805492] ? smc_unhash_sk+0x345/0x4a0 [ 27.809532] __warn.cold.8+0x163/0x1b3 [ 27.813397] ? smc_unhash_sk+0x345/0x4a0 [ 27.817439] report_bug+0x252/0x2d0 [ 27.821049] do_error_trap+0x1de/0x490 [ 27.824914] ? graph_lock+0x170/0x170 [ 27.828694] ? math_error+0x420/0x420 [ 27.832479] ? lock_acquire+0x1dc/0x520 [ 27.836435] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.841258] do_invalid_op+0x1b/0x20 [ 27.844951] invalid_op+0x14/0x20 [ 27.848387] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.853034] RSP: 0018:ffff8801b7da7488 EFLAGS: 00010293 [ 27.858376] RAX: ffff8801b36f2280 RBX: ffff8801b42007c0 RCX: ffffffff87402b7e [ 27.865624] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 27.872873] RBP: ffff8801b7da7570 R08: ffff8801b36f2280 R09: ffffed0036840108 [ 27.880122] R10: ffffed0036840108 R11: ffff8801b4200843 R12: 1ffff10036fb4e95 [ 27.887368] R13: ffff8801b7da7548 R14: ffffffff8970e8a0 R15: ffff8801b4200840 [ 27.894624] ? smc_unhash_sk+0x28e/0x4a0 [ 27.898662] ? smc_unhash_sk+0x345/0x4a0 [ 27.902704] ? smc_unhash_sk+0x345/0x4a0 [ 27.906746] ? smc_rx_data_available+0x100/0x100 [ 27.911488] ? release_sock+0x1e2/0x2b0 [ 27.915442] ? __local_bh_enable_ip+0x161/0x230 [ 27.920093] ? __release_sock+0x3a0/0x3a0 [ 27.924220] ? smc_release+0x269/0x610 [ 27.928089] ? trace_hardirqs_on+0xd/0x10 [ 27.932391] ? __local_bh_enable_ip+0x161/0x230 [ 27.937043] smc_release+0x36e/0x610 [ 27.940740] sock_release+0x96/0x1b0 [ 27.944437] ? sock_alloc_file+0x4e0/0x4e0 [ 27.948657] sock_close+0x16/0x20 [ 27.952092] __fput+0x34d/0x890 [ 27.955352] ? fput+0x1a0/0x1a0 [ 27.958612] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.963099] ____fput+0x15/0x20 [ 27.966358] task_work_run+0x1e4/0x290 [ 27.970224] ? task_work_cancel+0x240/0x240 [ 27.974526] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.980046] ? switch_task_namespaces+0xa2/0xd0 [ 27.984705] do_exit+0x1aee/0x2730 [ 27.988225] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.992615] ? mm_update_next_owner+0x980/0x980 [ 27.997268] ? ___sys_sendmsg+0x31a/0x940 [ 28.001394] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.006387] ? kfree+0x1e9/0x260 [ 28.009732] ? ___sys_sendmsg+0x31f/0x940 [ 28.013860] ? copy_msghdr_from_user+0x560/0x560 [ 28.018594] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.023587] ? graph_lock+0x170/0x170 [ 28.027366] ? pud_val+0x80/0xf0 [ 28.030712] ? __fget_light+0x2ef/0x430 [ 28.034662] ? __handle_mm_fault+0x93a/0x4310 [ 28.039137] ? fget_raw+0x20/0x20 [ 28.042572] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 28.047306] ? graph_lock+0x170/0x170 [ 28.051101] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.056617] ? sockfd_lookup_light+0xc5/0x160 [ 28.061095] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.066612] ? __sys_sendmmsg+0x4b3/0x6f0 [ 28.070741] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 28.075058] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.080587] ? __handle_mm_fault+0x4310/0x4310 [ 28.085165] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.090680] ? __do_page_fault+0x441/0xe40 [ 28.094898] do_group_exit+0x16f/0x430 [ 28.098762] ? mm_fault_error+0x380/0x380 [ 28.102889] ? __ia32_sys_exit+0x50/0x50 [ 28.106930] ? do_syscall_64+0x92/0x800 [ 28.110884] __x64_sys_exit_group+0x3e/0x50 [ 28.115184] do_syscall_64+0x1b1/0x800 [ 28.119059] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.123975] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.128887] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.134237] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.139071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.144242] RIP: 0033:0x43ef78 [ 28.147412] RSP: 002b:00007ffd72672f68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.155101] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef78 [ 28.162350] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.169598] RBP: 00000000004be980 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.176844] R10: 0000000024000090 R11: 0000000000000246 R12: 0000000000000001 [ 28.184090] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.192251] Dumping ftrace buffer: [ 28.195854] (ftrace buffer empty) [ 28.199538] Kernel Offset: disabled [ 28.203144] Rebooting in 86400 seconds..