[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.891292] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.956741] random: sshd: uninitialized urandom read (32 bytes read) [ 24.400289] random: sshd: uninitialized urandom read (32 bytes read) [ 25.143266] random: sshd: uninitialized urandom read (32 bytes read) [ 43.361790] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 48.805788] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 48.893925] WARNING: CPU: 0 PID: 4563 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 48.902307] Kernel panic - not syncing: panic_on_warn set ... [ 48.902307] [ 48.909649] CPU: 0 PID: 4563 Comm: syz-executor676 Not tainted 4.17.0-rc4+ #49 [ 48.917015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.926348] Call Trace: [ 48.928936] dump_stack+0x1b9/0x294 [ 48.932547] ? dump_stack_print_info.cold.2+0x52/0x52 [ 48.937729] ? smc_unhash_sk+0x250/0x4a0 [ 48.941782] panic+0x22f/0x4de [ 48.944958] ? add_taint.cold.5+0x16/0x16 [ 48.949101] ? __warn.cold.8+0x148/0x1b3 [ 48.953141] ? __warn.cold.8+0x117/0x1b3 [ 48.957182] ? smc_unhash_sk+0x345/0x4a0 [ 48.961223] __warn.cold.8+0x163/0x1b3 [ 48.965090] ? smc_unhash_sk+0x345/0x4a0 [ 48.969142] report_bug+0x252/0x2d0 [ 48.972750] do_error_trap+0x1de/0x490 [ 48.976619] ? graph_lock+0x170/0x170 [ 48.980401] ? math_error+0x420/0x420 [ 48.984184] ? lock_acquire+0x1dc/0x520 [ 48.988153] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.992979] do_invalid_op+0x1b/0x20 [ 48.996759] invalid_op+0x14/0x20 [ 49.000202] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 49.004858] RSP: 0018:ffff8801abfcf488 EFLAGS: 00010293 [ 49.010209] RAX: ffff8801a7f80200 RBX: ffff8801ae8a47c0 RCX: ffffffff8740f43e [ 49.017457] RDX: 0000000000000000 RSI: ffffffff8740f4f5 RDI: 0000000000000005 [ 49.024704] RBP: ffff8801abfcf570 R08: ffff8801a7f80200 R09: ffffed0035d14908 [ 49.031953] R10: ffffed0035d14908 R11: ffff8801ae8a4843 R12: 1ffff100357f9e95 [ 49.039201] R13: ffff8801abfcf548 R14: ffffffff8970da60 R15: ffff8801ae8a4840 [ 49.046456] ? smc_unhash_sk+0x28e/0x4a0 [ 49.050494] ? smc_unhash_sk+0x345/0x4a0 [ 49.054895] ? smc_unhash_sk+0x345/0x4a0 [ 49.059282] ? smc_rx_data_available+0x100/0x100 [ 49.064017] ? release_sock+0x1e2/0x2b0 [ 49.067972] ? __local_bh_enable_ip+0x161/0x230 [ 49.072618] ? __release_sock+0x3a0/0x3a0 [ 49.076742] ? smc_release+0x269/0x610 [ 49.080608] ? trace_hardirqs_on+0xd/0x10 [ 49.084732] ? __local_bh_enable_ip+0x161/0x230 [ 49.089380] smc_release+0x36e/0x610 [ 49.093076] sock_release+0x96/0x1b0 [ 49.096767] ? sock_alloc_file+0x4e0/0x4e0 [ 49.100990] sock_close+0x16/0x20 [ 49.104431] __fput+0x34d/0x890 [ 49.107691] ? fput+0x1a0/0x1a0 [ 49.110950] ? _raw_spin_unlock_irq+0x27/0x70 [ 49.115425] ____fput+0x15/0x20 [ 49.118696] task_work_run+0x1e4/0x290 [ 49.122565] ? task_work_cancel+0x240/0x240 [ 49.126870] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.132388] ? switch_task_namespaces+0xa2/0xd0 [ 49.137052] do_exit+0x1aee/0x2730 [ 49.140586] ? mm_update_next_owner+0x980/0x980 [ 49.145232] ? lock_downgrade+0x8e0/0x8e0 [ 49.149356] ? noop_count+0x40/0x40 [ 49.152963] ? lock_pin_lock+0x350/0x350 [ 49.157005] ? kasan_check_read+0x11/0x20 [ 49.161134] ? rcu_is_watching+0x85/0x140 [ 49.167745] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 49.173278] ? is_bpf_text_address+0xd7/0x170 [ 49.177753] ? check_usage_backwards+0x151/0x3a0 [ 49.182487] ? graph_lock+0x170/0x170 [ 49.186266] ? graph_lock+0x170/0x170 [ 49.190056] ? find_held_lock+0x36/0x1c0 [ 49.194102] ? lock_downgrade+0x8e0/0x8e0 [ 49.198232] ? kasan_check_read+0x11/0x20 [ 49.202372] ? do_raw_spin_unlock+0x9e/0x2e0 [ 49.206761] ? __local_bh_enable_ip+0x161/0x230 [ 49.211581] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.216576] ? release_sock+0x1e2/0x2b0 [ 49.220527] ? trace_hardirqs_on+0xd/0x10 [ 49.224652] ? __local_bh_enable_ip+0x161/0x230 [ 49.229299] ? _raw_spin_unlock_bh+0x30/0x40 [ 49.233695] ? release_sock+0x1e2/0x2b0 [ 49.237647] ? __release_sock+0x3a0/0x3a0 [ 49.241782] ? __local_bh_enable_ip+0x161/0x230 [ 49.246430] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 49.251599] ? smc_setsockopt+0x1ed/0x6d0 [ 49.255731] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.261436] ? __sys_setsockopt+0x24f/0x390 [ 49.265737] do_group_exit+0x16f/0x430 [ 49.269602] ? mm_fault_error+0x380/0x380 [ 49.273727] ? __ia32_sys_exit+0x50/0x50 [ 49.277770] ? do_syscall_64+0x92/0x800 [ 49.281736] __x64_sys_exit_group+0x3e/0x50 [ 49.286131] do_syscall_64+0x1b1/0x800 [ 49.289999] ? syscall_return_slowpath+0x5c0/0x5c0 [ 49.294907] ? syscall_return_slowpath+0x30f/0x5c0 [ 49.299818] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 49.305180] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.310004] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.315171] RIP: 0033:0x43e8d8 [ 49.318338] RSP: 002b:00007fffb8061c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 49.326041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 49.333289] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 49.340536] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 49.347794] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 49.355041] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 49.363277] Dumping ftrace buffer: [ 49.366858] (ftrace buffer empty) [ 49.370545] Kernel Offset: disabled [ 49.374152] Rebooting in 86400 seconds..