[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.588168] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.712826] random: sshd: uninitialized urandom read (32 bytes read) [ 24.043896] random: sshd: uninitialized urandom read (32 bytes read) [ 24.801267] random: sshd: uninitialized urandom read (32 bytes read) [ 24.961483] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 30.428555] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.523802] IPVS: ftp: loaded support on port[0] = 21 [ 30.560020] WARNING: CPU: 1 PID: 4522 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.568420] Kernel panic - not syncing: panic_on_warn set ... [ 30.568420] [ 30.575774] CPU: 1 PID: 4522 Comm: syz-executor495 Not tainted 4.17.0-rc3+ #37 [ 30.583113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.592446] Call Trace: [ 30.595019] dump_stack+0x1b9/0x294 [ 30.598627] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.603797] ? smc_unhash_sk+0x320/0x4a0 [ 30.607844] panic+0x22f/0x4de [ 30.611014] ? add_taint.cold.5+0x16/0x16 [ 30.615142] ? __warn.cold.8+0x148/0x1b3 [ 30.619182] ? __warn.cold.8+0x117/0x1b3 [ 30.623226] ? smc_unhash_sk+0x345/0x4a0 [ 30.627269] __warn.cold.8+0x163/0x1b3 [ 30.631141] ? smc_unhash_sk+0x345/0x4a0 [ 30.635189] report_bug+0x252/0x2d0 [ 30.638798] do_error_trap+0x1de/0x490 [ 30.642663] ? graph_lock+0x170/0x170 [ 30.646455] ? math_error+0x420/0x420 [ 30.650248] ? lock_acquire+0x1dc/0x520 [ 30.654211] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.659045] do_invalid_op+0x1b/0x20 [ 30.662740] invalid_op+0x14/0x20 [ 30.666182] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.670826] RSP: 0018:ffff8801ad31f488 EFLAGS: 00010293 [ 30.676172] RAX: ffff8801ad2ea740 RBX: ffff8801ad3b97c0 RCX: ffffffff873f756e [ 30.683431] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 30.690689] RBP: ffff8801ad31f570 R08: ffff8801ad2ea740 R09: ffffed0035a77308 [ 30.697954] R10: ffffed0035a77308 R11: ffff8801ad3b9843 R12: 1ffff10035a63e95 [ 30.705664] R13: ffff8801ad31f548 R14: ffffffff8970b180 R15: ffff8801ad3b9840 [ 30.712933] ? smc_unhash_sk+0x28e/0x4a0 [ 30.716977] ? smc_unhash_sk+0x345/0x4a0 [ 30.721018] ? smc_unhash_sk+0x345/0x4a0 [ 30.725066] ? smc_rx_data_available+0x100/0x100 [ 30.729806] ? release_sock+0x1e2/0x2b0 [ 30.733760] ? __local_bh_enable_ip+0x161/0x230 [ 30.738410] ? __release_sock+0x3a0/0x3a0 [ 30.742536] ? smc_release+0x269/0x610 [ 30.746403] ? trace_hardirqs_on+0xd/0x10 [ 30.750532] ? __local_bh_enable_ip+0x161/0x230 [ 30.755187] smc_release+0x36e/0x610 [ 30.758890] sock_release+0x96/0x1b0 [ 30.762585] ? sock_alloc_file+0x4e0/0x4e0 [ 30.766804] sock_close+0x16/0x20 [ 30.770238] __fput+0x34d/0x890 [ 30.773507] ? fput+0x1a0/0x1a0 [ 30.776770] ? check_same_owner+0x320/0x320 [ 30.781088] ____fput+0x15/0x20 [ 30.784348] task_work_run+0x1e4/0x290 [ 30.788217] ? task_work_cancel+0x240/0x240 [ 30.792517] ? switch_task_namespaces+0xbd/0xd0 [ 30.797527] do_exit+0x1aee/0x2730 [ 30.801063] ? mm_update_next_owner+0x980/0x980 [ 30.805730] ? find_held_lock+0x36/0x1c0 [ 30.809779] ? lock_downgrade+0x8e0/0x8e0 [ 30.813908] ? lock_downgrade+0x8e0/0x8e0 [ 30.818042] ? kasan_check_read+0x11/0x20 [ 30.822174] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.826564] ? __local_bh_enable_ip+0x161/0x230 [ 30.831217] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.836211] ? release_sock+0x1e2/0x2b0 [ 30.840174] ? trace_hardirqs_on+0xd/0x10 [ 30.844301] ? __local_bh_enable_ip+0x161/0x230 [ 30.848954] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.853352] ? release_sock+0x1e2/0x2b0 [ 30.857306] ? __release_sock+0x3a0/0x3a0 [ 30.861438] ? __local_bh_enable_ip+0x161/0x230 [ 30.866103] ? lock_sock_nested+0xe7/0x120 [ 30.870327] ? smc_sendmsg+0x2d5/0x370 [ 30.874193] ? smc_sendpage+0x1a0/0x1a0 [ 30.878150] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.883666] ? sock_sendmsg+0x5a/0x120 [ 30.887541] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.893057] ? __sys_sendto+0x475/0x670 [ 30.897020] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.901679] ? lock_downgrade+0x8e0/0x8e0 [ 30.905820] ? handle_mm_fault+0x8c0/0xc70 [ 30.910051] ? handle_mm_fault+0x55a/0xc70 [ 30.914276] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.919794] do_group_exit+0x16f/0x430 [ 30.923670] ? mm_fault_error+0x380/0x380 [ 30.927797] ? __ia32_sys_exit+0x50/0x50 [ 30.931843] ? do_syscall_64+0x92/0x800 [ 30.935801] __x64_sys_exit_group+0x3e/0x50 [ 30.940109] do_syscall_64+0x1b1/0x800 [ 30.943977] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.948893] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.953819] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.959183] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.964017] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.969196] RIP: 0033:0x440779 [ 30.972372] RSP: 002b:00007fff636ab248 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 30.980072] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440779 [ 30.987321] RDX: 0000000000440779 RSI: 0000000000000000 RDI: 0000000000000001 [ 30.994567] RBP: 00000000006cb018 R08: 000000000000001c R09: 0000000000401c90 [ 31.001815] R10: 0000000020000040 R11: 0000000000000206 R12: 0000000000401c00 [ 31.009062] R13: 0000000000401c90 R14: 0000000000000000 R15: 0000000000000000 [ 31.017004] Dumping ftrace buffer: [ 31.020629] (ftrace buffer empty) [ 31.024319] Kernel Offset: disabled [ 31.027930] Rebooting in 86400 seconds..