[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.031952] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.987187] random: sshd: uninitialized urandom read (32 bytes read) [ 23.160141] random: sshd: uninitialized urandom read (32 bytes read) [ 23.926870] random: sshd: uninitialized urandom read (32 bytes read) [ 35.302784] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 40.698916] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.787496] WARNING: CPU: 0 PID: 4504 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 40.795864] Kernel panic - not syncing: panic_on_warn set ... [ 40.795864] [ 40.803210] CPU: 0 PID: 4504 Comm: syz-executor407 Not tainted 4.17.0-rc4+ #52 [ 40.810544] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.819877] Call Trace: [ 40.822454] dump_stack+0x1b9/0x294 [ 40.826097] ? dump_stack_print_info.cold.2+0x52/0x52 [ 40.831274] ? smc_unhash_sk+0x2f0/0x4a0 [ 40.835321] panic+0x22f/0x4de [ 40.838497] ? add_taint.cold.5+0x16/0x16 [ 40.842627] ? __warn.cold.8+0x148/0x1b3 [ 40.846665] ? __warn.cold.8+0x117/0x1b3 [ 40.850704] ? smc_unhash_sk+0x345/0x4a0 [ 40.854744] __warn.cold.8+0x163/0x1b3 [ 40.858622] ? smc_unhash_sk+0x345/0x4a0 [ 40.862666] report_bug+0x252/0x2d0 [ 40.866275] do_error_trap+0x1de/0x490 [ 40.870156] ? graph_lock+0x170/0x170 [ 40.873935] ? math_error+0x420/0x420 [ 40.877717] ? lock_acquire+0x1dc/0x520 [ 40.881674] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.886501] do_invalid_op+0x1b/0x20 [ 40.890209] invalid_op+0x14/0x20 [ 40.893640] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 40.898284] RSP: 0018:ffff8801ad87f488 EFLAGS: 00010293 [ 40.903628] RAX: ffff8801adb9e100 RBX: ffff8801adef27c0 RCX: ffffffff8740fa9e [ 40.910876] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 40.918125] RBP: ffff8801ad87f570 R08: ffff8801adb9e100 R09: ffffed0035bde508 [ 40.925371] R10: ffffed0035bde508 R11: ffff8801adef2843 R12: 1ffff10035b0fe95 [ 40.932621] R13: ffff8801ad87f548 R14: ffffffff8970dc60 R15: ffff8801adef2840 [ 40.939880] ? smc_unhash_sk+0x28e/0x4a0 [ 40.943919] ? smc_unhash_sk+0x345/0x4a0 [ 40.947963] ? smc_unhash_sk+0x345/0x4a0 [ 40.952016] ? smc_rx_data_available+0x100/0x100 [ 40.956751] ? release_sock+0x1e2/0x2b0 [ 40.960706] ? __local_bh_enable_ip+0x161/0x230 [ 40.965356] ? __release_sock+0x3a0/0x3a0 [ 40.969485] ? smc_release+0x269/0x610 [ 40.973351] ? trace_hardirqs_on+0xd/0x10 [ 40.977479] ? __local_bh_enable_ip+0x161/0x230 [ 40.982127] smc_release+0x36e/0x610 [ 40.985825] sock_release+0x96/0x1b0 [ 40.989520] ? sock_alloc_file+0x4e0/0x4e0 [ 40.993732] sock_close+0x16/0x20 [ 40.997166] __fput+0x34d/0x890 [ 41.000434] ? fput+0x1a0/0x1a0 [ 41.003699] ? _raw_spin_unlock_irq+0x27/0x70 [ 41.008175] ____fput+0x15/0x20 [ 41.011442] task_work_run+0x1e4/0x290 [ 41.015310] ? task_work_cancel+0x240/0x240 [ 41.019616] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 41.025146] ? switch_task_namespaces+0xa2/0xd0 [ 41.029812] do_exit+0x1aee/0x2730 [ 41.033336] ? mm_update_next_owner+0x980/0x980 [ 41.037986] ? lock_downgrade+0x8e0/0x8e0 [ 41.042118] ? noop_count+0x40/0x40 [ 41.045741] ? lock_pin_lock+0x350/0x350 [ 41.049788] ? kasan_check_read+0x11/0x20 [ 41.053914] ? rcu_is_watching+0x85/0x140 [ 41.058039] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 41.063210] ? is_bpf_text_address+0xd7/0x170 [ 41.067702] ? check_usage_backwards+0x151/0x3a0 [ 41.072444] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.077961] ? sock_do_ioctl+0x107/0x3e0 [ 41.082001] ? compat_ifr_data_ioctl+0x170/0x170 [ 41.086737] ? find_held_lock+0x36/0x1c0 [ 41.090794] ? sock_ioctl+0x32e/0x680 [ 41.094572] ? dlci_ioctl_set+0x40/0x40 [ 41.098525] ? do_raw_spin_unlock+0x9e/0x2e0 [ 41.102914] ? __local_bh_enable_ip+0x161/0x230 [ 41.107569] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 41.112566] ? release_sock+0x1e2/0x2b0 [ 41.116525] ? trace_hardirqs_on+0xd/0x10 [ 41.120654] ? __local_bh_enable_ip+0x161/0x230 [ 41.125310] ? dlci_ioctl_set+0x40/0x40 [ 41.129263] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.134777] ? do_vfs_ioctl+0x1f2/0x16a0 [ 41.138818] ? ioctl_preallocate+0x2e0/0x2e0 [ 41.143206] ? fget_raw+0x20/0x20 [ 41.146637] ? smc_setsockopt+0x1ed/0x6d0 [ 41.150766] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.156281] ? __sys_setsockopt+0x24f/0x390 [ 41.160582] do_group_exit+0x16f/0x430 [ 41.164449] ? mm_fault_error+0x380/0x380 [ 41.168576] ? __ia32_sys_exit+0x50/0x50 [ 41.172617] ? ksys_ioctl+0x81/0xd0 [ 41.176226] ? do_syscall_64+0x92/0x800 [ 41.180179] __x64_sys_exit_group+0x3e/0x50 [ 41.184479] do_syscall_64+0x1b1/0x800 [ 41.188367] ? syscall_return_slowpath+0x5c0/0x5c0 [ 41.193276] ? syscall_return_slowpath+0x30f/0x5c0 [ 41.198186] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 41.203530] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.208356] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.213943] RIP: 0033:0x43e8f8 [ 41.217118] RSP: 002b:00007ffe8f136468 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 41.224809] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8f8 [ 41.232054] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 41.239304] RBP: 00000000004be2a0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 41.246555] R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000001 [ 41.253807] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 41.261743] Dumping ftrace buffer: [ 41.265344] (ftrace buffer empty) [ 41.269037] Kernel Offset: disabled [ 41.272654] Rebooting in 86400 seconds..