[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.197189] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.930233] random: sshd: uninitialized urandom read (32 bytes read) [ 23.260726] random: sshd: uninitialized urandom read (32 bytes read) [ 24.005470] random: sshd: uninitialized urandom read (32 bytes read) [ 24.163263] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 29.583338] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.674440] WARNING: CPU: 1 PID: 4526 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.682825] Kernel panic - not syncing: panic_on_warn set ... [ 29.682825] [ 29.690171] CPU: 1 PID: 4526 Comm: syz-executor495 Not tainted 4.17.0-rc6+ #58 [ 29.697508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.706839] Call Trace: [ 29.709427] dump_stack+0x1b9/0x294 [ 29.713044] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.718226] ? smc_unhash_sk+0x270/0x4a0 [ 29.722267] panic+0x22f/0x4de [ 29.725441] ? add_taint.cold.5+0x16/0x16 [ 29.729575] ? __warn.cold.8+0x148/0x1b3 [ 29.733616] ? __warn.cold.8+0x117/0x1b3 [ 29.737659] ? smc_unhash_sk+0x345/0x4a0 [ 29.741699] __warn.cold.8+0x163/0x1b3 [ 29.745566] ? smc_unhash_sk+0x345/0x4a0 [ 29.749612] report_bug+0x252/0x2d0 [ 29.753228] do_error_trap+0x1de/0x490 [ 29.757096] ? graph_lock+0x170/0x170 [ 29.760881] ? math_error+0x420/0x420 [ 29.764671] ? lock_acquire+0x1dc/0x520 [ 29.768632] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.773477] do_invalid_op+0x1b/0x20 [ 29.777175] invalid_op+0x14/0x20 [ 29.780612] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.785264] RSP: 0018:ffff8801ad7df488 EFLAGS: 00010293 [ 29.790606] RAX: ffff8801ad60a700 RBX: ffff8801ad6c57c0 RCX: ffffffff8741441e [ 29.797855] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 29.805114] RBP: ffff8801ad7df570 R08: ffff8801ad60a700 R09: ffffed0035ad8b08 [ 29.812362] R10: ffffed0035ad8b08 R11: ffff8801ad6c5843 R12: 1ffff10035afbe95 [ 29.819611] R13: ffff8801ad7df548 R14: ffffffff8970da60 R15: ffff8801ad6c5840 [ 29.826875] ? smc_unhash_sk+0x28e/0x4a0 [ 29.830923] ? smc_unhash_sk+0x345/0x4a0 [ 29.834969] ? smc_unhash_sk+0x345/0x4a0 [ 29.839019] ? smc_rx_data_available+0x100/0x100 [ 29.843765] ? release_sock+0x1e2/0x2b0 [ 29.847738] ? __local_bh_enable_ip+0x161/0x230 [ 29.852400] ? __release_sock+0x3a0/0x3a0 [ 29.856541] ? smc_release+0x269/0x610 [ 29.860408] ? trace_hardirqs_on+0xd/0x10 [ 29.864537] ? __local_bh_enable_ip+0x161/0x230 [ 29.869188] smc_release+0x36e/0x610 [ 29.872911] sock_release+0x96/0x1b0 [ 29.876619] ? sock_alloc_file+0x4e0/0x4e0 [ 29.880845] sock_close+0x16/0x20 [ 29.884290] __fput+0x34d/0x890 [ 29.887566] ? fput+0x1a0/0x1a0 [ 29.890827] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.895304] ____fput+0x15/0x20 [ 29.898566] task_work_run+0x1e4/0x290 [ 29.902432] ? task_work_cancel+0x240/0x240 [ 29.906736] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.912254] ? switch_task_namespaces+0xa2/0xd0 [ 29.916905] do_exit+0x1aee/0x2730 [ 29.920427] ? mm_update_next_owner+0x980/0x980 [ 29.925074] ? lock_downgrade+0x8e0/0x8e0 [ 29.929199] ? noop_count+0x40/0x40 [ 29.932809] ? lock_pin_lock+0x350/0x350 [ 29.936860] ? kasan_check_read+0x11/0x20 [ 29.940989] ? rcu_is_watching+0x85/0x140 [ 29.945120] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.950300] ? is_bpf_text_address+0xd7/0x170 [ 29.954777] ? check_usage_backwards+0x151/0x3a0 [ 29.959512] ? graph_lock+0x170/0x170 [ 29.963300] ? graph_lock+0x170/0x170 [ 29.967095] ? find_held_lock+0x36/0x1c0 [ 29.971142] ? lock_downgrade+0x8e0/0x8e0 [ 29.975272] ? kasan_check_read+0x11/0x20 [ 29.979399] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.983787] ? __local_bh_enable_ip+0x161/0x230 [ 29.988434] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.993428] ? release_sock+0x1e2/0x2b0 [ 29.997383] ? trace_hardirqs_on+0xd/0x10 [ 30.001521] ? __local_bh_enable_ip+0x161/0x230 [ 30.006172] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.010576] ? release_sock+0x1e2/0x2b0 [ 30.014529] ? __release_sock+0x3a0/0x3a0 [ 30.018660] ? __local_bh_enable_ip+0x161/0x230 [ 30.023311] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.028480] ? smc_setsockopt+0x1ed/0x6d0 [ 30.032620] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.038146] ? __sys_setsockopt+0x24f/0x390 [ 30.042450] do_group_exit+0x16f/0x430 [ 30.046327] ? mm_fault_error+0x380/0x380 [ 30.050455] ? __ia32_sys_exit+0x50/0x50 [ 30.054503] ? do_syscall_64+0x92/0x800 [ 30.058459] __x64_sys_exit_group+0x3e/0x50 [ 30.062769] do_syscall_64+0x1b1/0x800 [ 30.066646] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.071555] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.076468] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.081813] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.086637] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.091803] RIP: 0033:0x43e8b8 [ 30.094971] RSP: 002b:00007ffe640014b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.102659] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 30.109908] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.117166] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.124420] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 30.131676] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.139502] Dumping ftrace buffer: [ 30.143126] (ftrace buffer empty) [ 30.146815] Kernel Offset: disabled [ 30.150422] Rebooting in 86400 seconds..