[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.300943] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.684728] random: sshd: uninitialized urandom read (32 bytes read) [ 20.948470] random: sshd: uninitialized urandom read (32 bytes read) [ 21.744990] random: sshd: uninitialized urandom read (32 bytes read) [ 21.912732] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 27.354545] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.450446] WARNING: CPU: 0 PID: 4521 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.458868] Kernel panic - not syncing: panic_on_warn set ... [ 27.458868] [ 27.466221] CPU: 0 PID: 4521 Comm: syz-executor854 Not tainted 4.17.0-rc6+ #58 [ 27.473561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.482893] Call Trace: [ 27.485473] dump_stack+0x1b9/0x294 [ 27.489082] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.494257] ? smc_unhash_sk+0x270/0x4a0 [ 27.498299] panic+0x22f/0x4de [ 27.501469] ? add_taint.cold.5+0x16/0x16 [ 27.505597] ? __warn.cold.8+0x148/0x1b3 [ 27.509640] ? __warn.cold.8+0x117/0x1b3 [ 27.513683] ? smc_unhash_sk+0x345/0x4a0 [ 27.517740] __warn.cold.8+0x163/0x1b3 [ 27.521695] ? smc_unhash_sk+0x345/0x4a0 [ 27.525742] report_bug+0x252/0x2d0 [ 27.529352] do_error_trap+0x1de/0x490 [ 27.533226] ? graph_lock+0x170/0x170 [ 27.537095] ? math_error+0x420/0x420 [ 27.540892] ? lock_acquire+0x1dc/0x520 [ 27.544858] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.549680] do_invalid_op+0x1b/0x20 [ 27.553380] invalid_op+0x14/0x20 [ 27.556817] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.561459] RSP: 0018:ffff8801cf147488 EFLAGS: 00010293 [ 27.566801] RAX: ffff8801ace16740 RBX: ffff8801b29037c0 RCX: ffffffff8741441e [ 27.574055] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 27.581307] RBP: ffff8801cf147570 R08: ffff8801ace16740 R09: ffffed0036520708 [ 27.588559] R10: ffffed0036520708 R11: ffff8801b2903843 R12: 1ffff10039e28e95 [ 27.595809] R13: ffff8801cf147548 R14: ffffffff8970da60 R15: ffff8801b2903840 [ 27.603076] ? smc_unhash_sk+0x28e/0x4a0 [ 27.607129] ? smc_unhash_sk+0x345/0x4a0 [ 27.611175] ? smc_unhash_sk+0x345/0x4a0 [ 27.615219] ? smc_rx_data_available+0x100/0x100 [ 27.619958] ? release_sock+0x1e2/0x2b0 [ 27.624422] ? __local_bh_enable_ip+0x161/0x230 [ 27.629082] ? __release_sock+0x3a0/0x3a0 [ 27.633213] ? smc_release+0x269/0x610 [ 27.637083] ? trace_hardirqs_on+0xd/0x10 [ 27.641211] ? __local_bh_enable_ip+0x161/0x230 [ 27.645861] smc_release+0x36e/0x610 [ 27.649564] sock_release+0x96/0x1b0 [ 27.653268] ? sock_alloc_file+0x4e0/0x4e0 [ 27.657481] sock_close+0x16/0x20 [ 27.660917] __fput+0x34d/0x890 [ 27.664179] ? fput+0x1a0/0x1a0 [ 27.667444] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.671921] ____fput+0x15/0x20 [ 27.675182] task_work_run+0x1e4/0x290 [ 27.679061] ? task_work_cancel+0x240/0x240 [ 27.683364] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.688880] ? switch_task_namespaces+0xa2/0xd0 [ 27.693530] do_exit+0x1aee/0x2730 [ 27.697054] ? mm_update_next_owner+0x980/0x980 [ 27.701702] ? lock_downgrade+0x8e0/0x8e0 [ 27.705826] ? noop_count+0x40/0x40 [ 27.709432] ? lock_pin_lock+0x350/0x350 [ 27.713472] ? kasan_check_read+0x11/0x20 [ 27.717600] ? rcu_is_watching+0x85/0x140 [ 27.721730] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.726908] ? is_bpf_text_address+0xd7/0x170 [ 27.731388] ? check_usage_backwards+0x151/0x3a0 [ 27.736129] ? graph_lock+0x170/0x170 [ 27.739909] ? graph_lock+0x170/0x170 [ 27.743695] ? find_held_lock+0x36/0x1c0 [ 27.747742] ? lock_downgrade+0x8e0/0x8e0 [ 27.751876] ? kasan_check_read+0x11/0x20 [ 27.756014] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.760416] ? __local_bh_enable_ip+0x161/0x230 [ 27.765064] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.770069] ? release_sock+0x1e2/0x2b0 [ 27.774032] ? trace_hardirqs_on+0xd/0x10 [ 27.778166] ? __local_bh_enable_ip+0x161/0x230 [ 27.782819] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.787209] ? release_sock+0x1e2/0x2b0 [ 27.791164] ? __release_sock+0x3a0/0x3a0 [ 27.795294] ? __local_bh_enable_ip+0x161/0x230 [ 27.799953] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 27.805131] ? smc_setsockopt+0x1ed/0x6d0 [ 27.809270] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.814794] ? __sys_setsockopt+0x24f/0x390 [ 27.819100] do_group_exit+0x16f/0x430 [ 27.822968] ? mm_fault_error+0x380/0x380 [ 27.827094] ? __ia32_sys_exit+0x50/0x50 [ 27.831137] ? do_syscall_64+0x92/0x800 [ 27.835091] __x64_sys_exit_group+0x3e/0x50 [ 27.839392] do_syscall_64+0x1b1/0x800 [ 27.843262] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.848175] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.853096] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.858440] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.863266] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.868440] RIP: 0033:0x43e8d8 [ 27.871610] RSP: 002b:00007ffff0224fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.879299] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 27.886551] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.893800] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.901054] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 27.908311] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.916250] Dumping ftrace buffer: [ 27.919907] (ftrace buffer empty) [ 27.923596] Kernel Offset: disabled [ 27.927208] Rebooting in 86400 seconds..