[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.860342] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.726215] random: sshd: uninitialized urandom read (32 bytes read) [ 23.013323] random: sshd: uninitialized urandom read (32 bytes read) [ 23.793408] random: sshd: uninitialized urandom read (32 bytes read) [ 23.959176] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 29.400742] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.495411] WARNING: CPU: 0 PID: 4539 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.503812] Kernel panic - not syncing: panic_on_warn set ... [ 29.503812] [ 29.511161] CPU: 0 PID: 4539 Comm: syz-executor250 Not tainted 4.17.0-rc4+ #47 [ 29.518498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.527831] Call Trace: [ 29.530412] dump_stack+0x1b9/0x294 [ 29.534033] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.539212] ? smc_unhash_sk+0x310/0x4a0 [ 29.543269] panic+0x22f/0x4de [ 29.546468] ? add_taint.cold.5+0x16/0x16 [ 29.550605] ? __warn.cold.8+0x148/0x1b3 [ 29.554646] ? __warn.cold.8+0x117/0x1b3 [ 29.558689] ? smc_unhash_sk+0x345/0x4a0 [ 29.562736] __warn.cold.8+0x163/0x1b3 [ 29.566619] ? smc_unhash_sk+0x345/0x4a0 [ 29.570665] report_bug+0x252/0x2d0 [ 29.574275] do_error_trap+0x1de/0x490 [ 29.578143] ? graph_lock+0x170/0x170 [ 29.581921] ? math_error+0x420/0x420 [ 29.585707] ? lock_acquire+0x1dc/0x520 [ 29.589668] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.594493] do_invalid_op+0x1b/0x20 [ 29.598204] invalid_op+0x14/0x20 [ 29.601644] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.606292] RSP: 0018:ffff8801afa7f488 EFLAGS: 00010293 [ 29.611636] RAX: ffff8801ad22a000 RBX: ffff8801d92c67c0 RCX: ffffffff8740e77e [ 29.618883] RDX: 0000000000000000 RSI: ffffffff8740e835 RDI: 0000000000000005 [ 29.626130] RBP: ffff8801afa7f570 R08: ffff8801ad22a000 R09: ffffed003b258d08 [ 29.633380] R10: ffffed003b258d08 R11: ffff8801d92c6843 R12: 1ffff10035f4fe95 [ 29.640629] R13: ffff8801afa7f548 R14: ffffffff8970d520 R15: ffff8801d92c6840 [ 29.647893] ? smc_unhash_sk+0x28e/0x4a0 [ 29.651938] ? smc_unhash_sk+0x345/0x4a0 [ 29.655983] ? smc_unhash_sk+0x345/0x4a0 [ 29.660035] ? smc_rx_data_available+0x100/0x100 [ 29.664775] ? release_sock+0x1e2/0x2b0 [ 29.668737] ? __local_bh_enable_ip+0x161/0x230 [ 29.673387] ? __release_sock+0x3a0/0x3a0 [ 29.677532] ? smc_release+0x269/0x610 [ 29.681402] ? trace_hardirqs_on+0xd/0x10 [ 29.685539] ? __local_bh_enable_ip+0x161/0x230 [ 29.690192] smc_release+0x36e/0x610 [ 29.693900] sock_release+0x96/0x1b0 [ 29.697596] ? sock_alloc_file+0x4e0/0x4e0 [ 29.701816] sock_close+0x16/0x20 [ 29.705258] __fput+0x34d/0x890 [ 29.708525] ? fput+0x1a0/0x1a0 [ 29.711807] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.716285] ____fput+0x15/0x20 [ 29.719555] task_work_run+0x1e4/0x290 [ 29.723426] ? task_work_cancel+0x240/0x240 [ 29.727737] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.733258] ? switch_task_namespaces+0xa2/0xd0 [ 29.737910] do_exit+0x1aee/0x2730 [ 29.741436] ? mm_update_next_owner+0x980/0x980 [ 29.746091] ? lock_downgrade+0x8e0/0x8e0 [ 29.750220] ? noop_count+0x40/0x40 [ 29.753825] ? lock_pin_lock+0x350/0x350 [ 29.757871] ? kasan_check_read+0x11/0x20 [ 29.762024] ? rcu_is_watching+0x85/0x140 [ 29.766155] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.771335] ? is_bpf_text_address+0xd7/0x170 [ 29.775812] ? check_usage_backwards+0x151/0x3a0 [ 29.780547] ? graph_lock+0x170/0x170 [ 29.784329] ? graph_lock+0x170/0x170 [ 29.788113] ? find_held_lock+0x36/0x1c0 [ 29.792158] ? lock_downgrade+0x8e0/0x8e0 [ 29.796293] ? kasan_check_read+0x11/0x20 [ 29.800427] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.804822] ? __local_bh_enable_ip+0x161/0x230 [ 29.809473] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.814481] ? release_sock+0x1e2/0x2b0 [ 29.818437] ? trace_hardirqs_on+0xd/0x10 [ 29.822569] ? __local_bh_enable_ip+0x161/0x230 [ 29.827222] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.831611] ? release_sock+0x1e2/0x2b0 [ 29.835570] ? __release_sock+0x3a0/0x3a0 [ 29.839697] ? __local_bh_enable_ip+0x161/0x230 [ 29.844348] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.849523] ? smc_setsockopt+0x1ed/0x6d0 [ 29.853664] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.859185] ? __sys_setsockopt+0x24f/0x390 [ 29.863493] do_group_exit+0x16f/0x430 [ 29.867379] ? mm_fault_error+0x380/0x380 [ 29.871539] ? __ia32_sys_exit+0x50/0x50 [ 29.875603] ? do_syscall_64+0x92/0x800 [ 29.879568] __x64_sys_exit_group+0x3e/0x50 [ 29.883871] do_syscall_64+0x1b1/0x800 [ 29.887738] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.892670] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.897594] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.902941] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.907782] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.912959] RIP: 0033:0x43e8d8 [ 29.916131] RSP: 002b:00007ffdef6e5fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.923834] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.931088] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.938339] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.945596] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 29.952851] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.960805] Dumping ftrace buffer: [ 29.964482] (ftrace buffer empty) [ 29.968172] Kernel Offset: disabled [ 29.971783] Rebooting in 86400 seconds..