[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.098951] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.757189] random: sshd: uninitialized urandom read (32 bytes read) [ 24.029443] random: sshd: uninitialized urandom read (32 bytes read) [ 24.768608] random: sshd: uninitialized urandom read (32 bytes read) [ 24.941267] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 30.326792] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.417755] WARNING: CPU: 1 PID: 4534 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.426140] Kernel panic - not syncing: panic_on_warn set ... [ 30.426140] [ 30.433494] CPU: 1 PID: 4534 Comm: syz-executor081 Not tainted 4.17.0-rc6+ #60 [ 30.440829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.450162] Call Trace: [ 30.452731] dump_stack+0x1b9/0x294 [ 30.456341] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.461528] ? smc_unhash_sk+0x270/0x4a0 [ 30.465571] panic+0x22f/0x4de [ 30.468755] ? add_taint.cold.5+0x16/0x16 [ 30.472891] ? __warn.cold.8+0x148/0x1b3 [ 30.476937] ? __warn.cold.8+0x117/0x1b3 [ 30.480987] ? smc_unhash_sk+0x345/0x4a0 [ 30.485039] __warn.cold.8+0x163/0x1b3 [ 30.488912] ? smc_unhash_sk+0x345/0x4a0 [ 30.492955] report_bug+0x252/0x2d0 [ 30.496567] do_error_trap+0x1de/0x490 [ 30.500435] ? graph_lock+0x170/0x170 [ 30.504229] ? math_error+0x420/0x420 [ 30.508042] ? lock_acquire+0x1dc/0x520 [ 30.512008] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.516846] do_invalid_op+0x1b/0x20 [ 30.520544] invalid_op+0x14/0x20 [ 30.523983] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.528631] RSP: 0018:ffff8801ad467488 EFLAGS: 00010293 [ 30.533976] RAX: ffff8801adb4a0c0 RBX: ffff8801ae6297c0 RCX: ffffffff8741d11e [ 30.541226] RDX: 0000000000000000 RSI: ffffffff8741d1d5 RDI: 0000000000000005 [ 30.548481] RBP: ffff8801ad467570 R08: ffff8801adb4a0c0 R09: ffffed0035cc5308 [ 30.555732] R10: ffffed0035cc5308 R11: ffff8801ae629843 R12: 1ffff10035a8ce95 [ 30.563082] R13: ffff8801ad467548 R14: ffffffff8970e020 R15: ffff8801ae629840 [ 30.570352] ? smc_unhash_sk+0x28e/0x4a0 [ 30.574396] ? smc_unhash_sk+0x345/0x4a0 [ 30.578441] ? smc_unhash_sk+0x345/0x4a0 [ 30.582490] ? smc_rx_data_available+0x100/0x100 [ 30.587233] ? release_sock+0x1e2/0x2b0 [ 30.591192] ? __local_bh_enable_ip+0x161/0x230 [ 30.595863] ? __release_sock+0x3a0/0x3a0 [ 30.600000] ? smc_release+0x269/0x610 [ 30.603876] ? trace_hardirqs_on+0xd/0x10 [ 30.608016] ? __local_bh_enable_ip+0x161/0x230 [ 30.612707] smc_release+0x36e/0x610 [ 30.616413] sock_release+0x96/0x1b0 [ 30.620109] ? sock_alloc_file+0x4e0/0x4e0 [ 30.624325] sock_close+0x16/0x20 [ 30.627760] __fput+0x34d/0x890 [ 30.631033] ? fput+0x1a0/0x1a0 [ 30.634300] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.638780] ____fput+0x15/0x20 [ 30.642048] task_work_run+0x1e4/0x290 [ 30.645929] ? task_work_cancel+0x240/0x240 [ 30.650245] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.655765] ? switch_task_namespaces+0xa2/0xd0 [ 30.660419] do_exit+0x1aee/0x2730 [ 30.663942] ? mm_update_next_owner+0x980/0x980 [ 30.668592] ? lock_downgrade+0x8e0/0x8e0 [ 30.672717] ? noop_count+0x40/0x40 [ 30.676322] ? lock_pin_lock+0x350/0x350 [ 30.680365] ? kasan_check_read+0x11/0x20 [ 30.684492] ? rcu_is_watching+0x85/0x140 [ 30.688634] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.693819] ? is_bpf_text_address+0xd7/0x170 [ 30.698303] ? check_usage_backwards+0x151/0x3a0 [ 30.703075] ? graph_lock+0x170/0x170 [ 30.706879] ? graph_lock+0x170/0x170 [ 30.710668] ? find_held_lock+0x36/0x1c0 [ 30.714715] ? lock_downgrade+0x8e0/0x8e0 [ 30.718853] ? kasan_check_read+0x11/0x20 [ 30.722983] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.727379] ? __local_bh_enable_ip+0x161/0x230 [ 30.732044] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.737052] ? release_sock+0x1e2/0x2b0 [ 30.741036] ? trace_hardirqs_on+0xd/0x10 [ 30.745168] ? __local_bh_enable_ip+0x161/0x230 [ 30.749820] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.754210] ? release_sock+0x1e2/0x2b0 [ 30.758165] ? __release_sock+0x3a0/0x3a0 [ 30.762296] ? __local_bh_enable_ip+0x161/0x230 [ 30.766949] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.772122] ? smc_setsockopt+0x1ed/0x6d0 [ 30.776252] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.781771] ? __sys_setsockopt+0x24f/0x390 [ 30.786083] do_group_exit+0x16f/0x430 [ 30.789957] ? mm_fault_error+0x380/0x380 [ 30.794089] ? __ia32_sys_exit+0x50/0x50 [ 30.798137] ? do_syscall_64+0x92/0x800 [ 30.802098] __x64_sys_exit_group+0x3e/0x50 [ 30.806426] do_syscall_64+0x1b1/0x800 [ 30.810299] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.815210] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.820127] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.825474] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.830304] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.835481] RIP: 0033:0x43e8d8 [ 30.838660] RSP: 002b:00007ffd257e7fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.846357] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.853606] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.860857] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.868115] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.875371] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.883299] Dumping ftrace buffer: [ 30.886924] (ftrace buffer empty) [ 30.890626] Kernel Offset: disabled [ 30.894240] Rebooting in 86400 seconds..