[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.802198] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.440975] random: sshd: uninitialized urandom read (32 bytes read) [ 21.782899] random: sshd: uninitialized urandom read (32 bytes read) [ 22.480365] random: sshd: uninitialized urandom read (32 bytes read) [ 22.636942] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 28.112919] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.217105] WARNING: CPU: 0 PID: 4516 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.225507] Kernel panic - not syncing: panic_on_warn set ... [ 28.225507] [ 28.232853] CPU: 0 PID: 4516 Comm: syz-executor017 Not tainted 4.17.0-rc3+ #33 [ 28.240190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.249521] Call Trace: [ 28.252089] dump_stack+0x1b9/0x294 [ 28.255696] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.260869] ? smc_unhash_sk+0x270/0x4a0 [ 28.264913] panic+0x22f/0x4de [ 28.268084] ? add_taint.cold.5+0x16/0x16 [ 28.272214] ? __warn.cold.8+0x148/0x1b3 [ 28.276252] ? __warn.cold.8+0x117/0x1b3 [ 28.280293] ? smc_unhash_sk+0x345/0x4a0 [ 28.284331] __warn.cold.8+0x163/0x1b3 [ 28.288198] ? smc_unhash_sk+0x345/0x4a0 [ 28.292238] report_bug+0x252/0x2d0 [ 28.295844] do_error_trap+0x1de/0x490 [ 28.299713] ? graph_lock+0x170/0x170 [ 28.303501] ? math_error+0x420/0x420 [ 28.307292] ? lock_acquire+0x1dc/0x520 [ 28.311248] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.316082] do_invalid_op+0x1b/0x20 [ 28.319776] invalid_op+0x14/0x20 [ 28.323210] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.327853] RSP: 0018:ffff8801ad04f488 EFLAGS: 00010293 [ 28.333195] RAX: ffff8801aee6a400 RBX: ffff8801ad2a47c0 RCX: ffffffff873fe71e [ 28.340442] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 28.347690] RBP: ffff8801ad04f570 R08: ffff8801aee6a400 R09: ffffed0035a54908 [ 28.354938] R10: ffffed0035a54908 R11: ffff8801ad2a4843 R12: 1ffff10035a09e95 [ 28.362187] R13: ffff8801ad04f548 R14: ffffffff8970e4e0 R15: ffff8801ad2a4840 [ 28.369444] ? smc_unhash_sk+0x28e/0x4a0 [ 28.373482] ? smc_unhash_sk+0x345/0x4a0 [ 28.377522] ? smc_unhash_sk+0x345/0x4a0 [ 28.381565] ? smc_rx_data_available+0x100/0x100 [ 28.386300] ? release_sock+0x1e2/0x2b0 [ 28.390256] ? __local_bh_enable_ip+0x161/0x230 [ 28.394906] ? __release_sock+0x3a0/0x3a0 [ 28.399039] ? smc_release+0x269/0x610 [ 28.402907] ? trace_hardirqs_on+0xd/0x10 [ 28.407042] ? __local_bh_enable_ip+0x161/0x230 [ 28.411692] smc_release+0x36e/0x610 [ 28.415390] sock_release+0x96/0x1b0 [ 28.419082] ? sock_alloc_file+0x4e0/0x4e0 [ 28.423299] sock_close+0x16/0x20 [ 28.426748] __fput+0x34d/0x890 [ 28.430014] ? fput+0x1a0/0x1a0 [ 28.433283] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.437759] ____fput+0x15/0x20 [ 28.441025] task_work_run+0x1e4/0x290 [ 28.444896] ? task_work_cancel+0x240/0x240 [ 28.449198] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.454713] ? switch_task_namespaces+0xa2/0xd0 [ 28.459362] do_exit+0x1aee/0x2730 [ 28.462883] ? mm_update_next_owner+0x980/0x980 [ 28.467530] ? lock_downgrade+0x8e0/0x8e0 [ 28.471659] ? noop_count+0x40/0x40 [ 28.475264] ? lock_pin_lock+0x350/0x350 [ 28.479307] ? kasan_check_read+0x11/0x20 [ 28.483433] ? rcu_is_watching+0x85/0x140 [ 28.487561] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.492732] ? is_bpf_text_address+0xd7/0x170 [ 28.497209] ? check_usage_backwards+0x151/0x3a0 [ 28.501955] ? graph_lock+0x170/0x170 [ 28.505743] ? graph_lock+0x170/0x170 [ 28.509527] ? find_held_lock+0x36/0x1c0 [ 28.513571] ? lock_downgrade+0x8e0/0x8e0 [ 28.517701] ? kasan_check_read+0x11/0x20 [ 28.521827] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.526219] ? __local_bh_enable_ip+0x161/0x230 [ 28.531143] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.536153] ? release_sock+0x1e2/0x2b0 [ 28.540106] ? trace_hardirqs_on+0xd/0x10 [ 28.544234] ? __local_bh_enable_ip+0x161/0x230 [ 28.548882] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.553269] ? release_sock+0x1e2/0x2b0 [ 28.557224] ? __release_sock+0x3a0/0x3a0 [ 28.561353] ? __local_bh_enable_ip+0x161/0x230 [ 28.566007] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.571188] ? smc_setsockopt+0x1ed/0x630 [ 28.575316] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.580834] ? __sys_setsockopt+0x24f/0x390 [ 28.585140] do_group_exit+0x16f/0x430 [ 28.589027] ? mm_fault_error+0x380/0x380 [ 28.593159] ? __ia32_sys_exit+0x50/0x50 [ 28.597211] ? do_syscall_64+0x92/0x800 [ 28.601168] __x64_sys_exit_group+0x3e/0x50 [ 28.605470] do_syscall_64+0x1b1/0x800 [ 28.609348] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.614257] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.619172] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.624529] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.629354] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.634522] RIP: 0033:0x43e8d8 [ 28.637689] RSP: 002b:00007ffc2d730578 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.645377] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 28.652631] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.659880] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.667129] R10: 00000000200002c0 R11: 0000000000000246 R12: 0000000000000001 [ 28.674378] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.682221] Dumping ftrace buffer: [ 28.685826] (ftrace buffer empty) [ 28.689525] Kernel Offset: disabled [ 28.693132] Rebooting in 86400 seconds..