[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.614130] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.181182] random: sshd: uninitialized urandom read (32 bytes read) [ 20.471255] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.215426] random: sshd: uninitialized urandom read (32 bytes read) [ 21.374580] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 26.812385] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.902881] WARNING: CPU: 0 PID: 4534 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 26.911259] Kernel panic - not syncing: panic_on_warn set ... [ 26.911259] [ 26.918608] CPU: 0 PID: 4534 Comm: syz-executor546 Not tainted 4.17.0-rc4+ #53 [ 26.925967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.935310] Call Trace: [ 26.937884] dump_stack+0x1b9/0x294 [ 26.941494] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.946670] ? smc_unhash_sk+0x260/0x4a0 [ 26.950723] panic+0x22f/0x4de [ 26.953897] ? add_taint.cold.5+0x16/0x16 [ 26.958036] ? __warn.cold.8+0x148/0x1b3 [ 26.962089] ? __warn.cold.8+0x117/0x1b3 [ 26.966134] ? smc_unhash_sk+0x345/0x4a0 [ 26.970176] __warn.cold.8+0x163/0x1b3 [ 26.974046] ? smc_unhash_sk+0x345/0x4a0 [ 26.978091] report_bug+0x252/0x2d0 [ 26.981700] do_error_trap+0x1de/0x490 [ 26.985566] ? graph_lock+0x170/0x170 [ 26.989350] ? math_error+0x420/0x420 [ 26.993146] ? lock_acquire+0x1dc/0x520 [ 26.997103] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.001925] do_invalid_op+0x1b/0x20 [ 27.005618] invalid_op+0x14/0x20 [ 27.009059] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.013714] RSP: 0018:ffff8801b22e7488 EFLAGS: 00010293 [ 27.019055] RAX: ffff8801ad9d00c0 RBX: ffff8801ad9837c0 RCX: ffffffff8740fb2e [ 27.026303] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 27.033557] RBP: ffff8801b22e7570 R08: ffff8801ad9d00c0 R09: ffffed0035b30708 [ 27.040805] R10: ffffed0035b30708 R11: ffff8801ad983843 R12: 1ffff1003645ce95 [ 27.048055] R13: ffff8801b22e7548 R14: ffffffff8970dc60 R15: ffff8801ad983840 [ 27.055318] ? smc_unhash_sk+0x28e/0x4a0 [ 27.059366] ? smc_unhash_sk+0x345/0x4a0 [ 27.063407] ? smc_unhash_sk+0x345/0x4a0 [ 27.067448] ? smc_rx_data_available+0x100/0x100 [ 27.072187] ? release_sock+0x1e2/0x2b0 [ 27.076149] ? __local_bh_enable_ip+0x161/0x230 [ 27.080806] ? __release_sock+0x3a0/0x3a0 [ 27.084934] ? smc_release+0x269/0x610 [ 27.088804] ? trace_hardirqs_on+0xd/0x10 [ 27.092933] ? __local_bh_enable_ip+0x161/0x230 [ 27.097596] smc_release+0x36e/0x610 [ 27.101295] sock_release+0x96/0x1b0 [ 27.105018] ? sock_alloc_file+0x4e0/0x4e0 [ 27.109258] sock_close+0x16/0x20 [ 27.112719] __fput+0x34d/0x890 [ 27.116003] ? fput+0x1a0/0x1a0 [ 27.119275] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.123752] ____fput+0x15/0x20 [ 27.127019] task_work_run+0x1e4/0x290 [ 27.130894] ? task_work_cancel+0x240/0x240 [ 27.135206] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.140725] ? switch_task_namespaces+0xa2/0xd0 [ 27.145384] do_exit+0x1aee/0x2730 [ 27.148907] ? mm_update_next_owner+0x980/0x980 [ 27.153556] ? lock_downgrade+0x8e0/0x8e0 [ 27.157683] ? noop_count+0x40/0x40 [ 27.161292] ? lock_pin_lock+0x350/0x350 [ 27.165340] ? kasan_check_read+0x11/0x20 [ 27.169468] ? rcu_is_watching+0x85/0x140 [ 27.173599] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.178773] ? is_bpf_text_address+0xd7/0x170 [ 27.183277] ? check_usage_backwards+0x151/0x3a0 [ 27.188030] ? graph_lock+0x170/0x170 [ 27.193229] ? graph_lock+0x170/0x170 [ 27.197043] ? find_held_lock+0x36/0x1c0 [ 27.201093] ? lock_downgrade+0x8e0/0x8e0 [ 27.205231] ? kasan_check_read+0x11/0x20 [ 27.209360] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.213750] ? __local_bh_enable_ip+0x161/0x230 [ 27.218399] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.223396] ? release_sock+0x1e2/0x2b0 [ 27.227352] ? trace_hardirqs_on+0xd/0x10 [ 27.231479] ? __local_bh_enable_ip+0x161/0x230 [ 27.238045] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.242438] ? release_sock+0x1e2/0x2b0 [ 27.246394] ? __release_sock+0x3a0/0x3a0 [ 27.250539] ? __local_bh_enable_ip+0x161/0x230 [ 27.255203] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 27.260387] ? smc_setsockopt+0x1ed/0x6d0 [ 27.264532] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.270052] ? __sys_setsockopt+0x24f/0x390 [ 27.274363] do_group_exit+0x16f/0x430 [ 27.278235] ? mm_fault_error+0x380/0x380 [ 27.282365] ? __ia32_sys_exit+0x50/0x50 [ 27.286423] ? do_syscall_64+0x92/0x800 [ 27.290382] __x64_sys_exit_group+0x3e/0x50 [ 27.294695] do_syscall_64+0x1b1/0x800 [ 27.298564] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.303479] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.308392] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.313743] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.318580] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.323749] RIP: 0033:0x43e8d8 [ 27.326917] RSP: 002b:00007ffecad18d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.334613] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 27.341877] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.349128] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.356376] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 27.363627] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.371483] Dumping ftrace buffer: [ 27.375097] (ftrace buffer empty) [ 27.378784] Kernel Offset: disabled [ 27.382393] Rebooting in 86400 seconds..