[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.113627] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.269244] random: sshd: uninitialized urandom read (32 bytes read) [ 24.835837] random: sshd: uninitialized urandom read (32 bytes read) [ 25.590275] random: sshd: uninitialized urandom read (32 bytes read) [ 25.750625] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 31.200672] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.292246] WARNING: CPU: 0 PID: 4552 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.300643] Kernel panic - not syncing: panic_on_warn set ... [ 31.300643] [ 31.307991] CPU: 0 PID: 4552 Comm: syz-executor436 Not tainted 4.17.0-rc3+ #37 [ 31.315341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.324672] Call Trace: [ 31.327245] dump_stack+0x1b9/0x294 [ 31.330859] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.336043] ? smc_unhash_sk+0x320/0x4a0 [ 31.340097] panic+0x22f/0x4de [ 31.343273] ? add_taint.cold.5+0x16/0x16 [ 31.347404] ? __warn.cold.8+0x148/0x1b3 [ 31.351444] ? __warn.cold.8+0x117/0x1b3 [ 31.355487] ? smc_unhash_sk+0x345/0x4a0 [ 31.359538] __warn.cold.8+0x163/0x1b3 [ 31.363410] ? smc_unhash_sk+0x345/0x4a0 [ 31.367454] report_bug+0x252/0x2d0 [ 31.371061] do_error_trap+0x1de/0x490 [ 31.374926] ? graph_lock+0x170/0x170 [ 31.378706] ? math_error+0x420/0x420 [ 31.382491] ? lock_acquire+0x1dc/0x520 [ 31.386446] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.391267] do_invalid_op+0x1b/0x20 [ 31.394969] invalid_op+0x14/0x20 [ 31.398402] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.403047] RSP: 0018:ffff8801c6677488 EFLAGS: 00010293 [ 31.408398] RAX: ffff8801ac904340 RBX: ffff8801ad5ad7c0 RCX: ffffffff873f756e [ 31.415652] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 31.422905] RBP: ffff8801c6677570 R08: ffff8801ac904340 R09: ffffed0035ab5b08 [ 31.430154] R10: ffffed0035ab5b08 R11: ffff8801ad5ad843 R12: 1ffff10038ccee95 [ 31.437404] R13: ffff8801c6677548 R14: ffffffff8970b1e0 R15: ffff8801ad5ad840 [ 31.444661] ? smc_unhash_sk+0x28e/0x4a0 [ 31.448701] ? smc_unhash_sk+0x345/0x4a0 [ 31.452746] ? smc_unhash_sk+0x345/0x4a0 [ 31.456787] ? smc_rx_data_available+0x100/0x100 [ 31.461525] ? release_sock+0x1e2/0x2b0 [ 31.465482] ? __local_bh_enable_ip+0x161/0x230 [ 31.470143] ? __release_sock+0x3a0/0x3a0 [ 31.474275] ? smc_release+0x269/0x610 [ 31.478147] ? trace_hardirqs_on+0xd/0x10 [ 31.482282] ? __local_bh_enable_ip+0x161/0x230 [ 31.486935] smc_release+0x36e/0x610 [ 31.490643] sock_release+0x96/0x1b0 [ 31.494337] ? sock_alloc_file+0x4e0/0x4e0 [ 31.498552] sock_close+0x16/0x20 [ 31.501985] __fput+0x34d/0x890 [ 31.505250] ? fput+0x1a0/0x1a0 [ 31.508509] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.512984] ____fput+0x15/0x20 [ 31.516245] task_work_run+0x1e4/0x290 [ 31.520114] ? task_work_cancel+0x240/0x240 [ 31.524415] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.529930] ? switch_task_namespaces+0xa2/0xd0 [ 31.534581] do_exit+0x1aee/0x2730 [ 31.538104] ? mm_update_next_owner+0x980/0x980 [ 31.542750] ? lock_downgrade+0x8e0/0x8e0 [ 31.546877] ? noop_count+0x40/0x40 [ 31.550483] ? lock_pin_lock+0x350/0x350 [ 31.554525] ? kasan_check_read+0x11/0x20 [ 31.558653] ? rcu_is_watching+0x85/0x140 [ 31.562789] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.567962] ? is_bpf_text_address+0xd7/0x170 [ 31.572439] ? check_usage_backwards+0x151/0x3a0 [ 31.577184] ? graph_lock+0x170/0x170 [ 31.580965] ? graph_lock+0x170/0x170 [ 31.584756] ? find_held_lock+0x36/0x1c0 [ 31.588819] ? lock_downgrade+0x8e0/0x8e0 [ 31.593223] ? kasan_check_read+0x11/0x20 [ 31.597350] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.601742] ? __local_bh_enable_ip+0x161/0x230 [ 31.606411] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.611406] ? release_sock+0x1e2/0x2b0 [ 31.615361] ? trace_hardirqs_on+0xd/0x10 [ 31.619496] ? __local_bh_enable_ip+0x161/0x230 [ 31.624147] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.628537] ? release_sock+0x1e2/0x2b0 [ 31.632492] ? __release_sock+0x3a0/0x3a0 [ 31.636621] ? __local_bh_enable_ip+0x161/0x230 [ 31.641362] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.646533] ? smc_setsockopt+0x1ed/0x630 [ 31.650664] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.656182] ? __sys_setsockopt+0x24f/0x390 [ 31.661133] do_group_exit+0x16f/0x430 [ 31.665014] ? mm_fault_error+0x380/0x380 [ 31.669158] ? __ia32_sys_exit+0x50/0x50 [ 31.673202] ? do_syscall_64+0x92/0x800 [ 31.677156] __x64_sys_exit_group+0x3e/0x50 [ 31.681456] do_syscall_64+0x1b1/0x800 [ 31.685325] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.690233] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.695143] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.700492] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.705318] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.710486] RIP: 0033:0x43e8d8 [ 31.713655] RSP: 002b:00007fff8e604e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.721343] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.728589] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.735836] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.743097] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001 [ 31.750345] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.758208] Dumping ftrace buffer: [ 31.761832] (ftrace buffer empty) [ 31.765517] Kernel Offset: disabled [ 31.769124] Rebooting in 86400 seconds..