[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.058333] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.183422] random: sshd: uninitialized urandom read (32 bytes read) [ 23.411829] random: sshd: uninitialized urandom read (32 bytes read) [ 24.205193] random: sshd: uninitialized urandom read (32 bytes read) [ 24.366254] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 29.829277] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.920621] WARNING: CPU: 0 PID: 4512 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.929029] Kernel panic - not syncing: panic_on_warn set ... [ 29.929029] [ 29.936388] CPU: 0 PID: 4512 Comm: syz-executor055 Not tainted 4.17.0-rc4+ #41 [ 29.943728] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.953061] Call Trace: [ 29.955634] dump_stack+0x1b9/0x294 [ 29.959246] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.964421] ? smc_unhash_sk+0x2d0/0x4a0 [ 29.968460] panic+0x22f/0x4de [ 29.971633] ? add_taint.cold.5+0x16/0x16 [ 29.975764] ? __warn.cold.8+0x148/0x1b3 [ 29.979805] ? __warn.cold.8+0x117/0x1b3 [ 29.983846] ? smc_unhash_sk+0x345/0x4a0 [ 29.987888] __warn.cold.8+0x163/0x1b3 [ 29.991756] ? smc_unhash_sk+0x345/0x4a0 [ 29.995799] report_bug+0x252/0x2d0 [ 29.999408] do_error_trap+0x1de/0x490 [ 30.003283] ? graph_lock+0x170/0x170 [ 30.007064] ? math_error+0x420/0x420 [ 30.010848] ? lock_acquire+0x1dc/0x520 [ 30.014806] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.019631] do_invalid_op+0x1b/0x20 [ 30.023325] invalid_op+0x14/0x20 [ 30.026756] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.031410] RSP: 0018:ffff8801d939f488 EFLAGS: 00010293 [ 30.036753] RAX: ffff8801d9256500 RBX: ffff8801d8c807c0 RCX: ffffffff87404cbe [ 30.044006] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 30.051261] RBP: ffff8801d939f570 R08: ffff8801d9256500 R09: ffffed003b190108 [ 30.058511] R10: ffffed003b190108 R11: ffff8801d8c80843 R12: 1ffff1003b273e95 [ 30.065761] R13: ffff8801d939f548 R14: ffffffff8970cc20 R15: ffff8801d8c80840 [ 30.073016] ? smc_unhash_sk+0x28e/0x4a0 [ 30.077054] ? smc_unhash_sk+0x345/0x4a0 [ 30.081094] ? smc_unhash_sk+0x345/0x4a0 [ 30.085134] ? smc_rx_data_available+0x100/0x100 [ 30.089868] ? release_sock+0x1e2/0x2b0 [ 30.093821] ? __local_bh_enable_ip+0x161/0x230 [ 30.098471] ? __release_sock+0x3a0/0x3a0 [ 30.102596] ? smc_release+0x269/0x610 [ 30.106469] ? trace_hardirqs_on+0xd/0x10 [ 30.110593] ? __local_bh_enable_ip+0x161/0x230 [ 30.115242] smc_release+0x36e/0x610 [ 30.118941] sock_release+0x96/0x1b0 [ 30.122634] ? sock_alloc_file+0x4e0/0x4e0 [ 30.126847] sock_close+0x16/0x20 [ 30.130282] __fput+0x34d/0x890 [ 30.133542] ? fput+0x1a0/0x1a0 [ 30.136802] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.141277] ____fput+0x15/0x20 [ 30.144536] task_work_run+0x1e4/0x290 [ 30.148407] ? task_work_cancel+0x240/0x240 [ 30.152712] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.158231] ? switch_task_namespaces+0xa2/0xd0 [ 30.162883] do_exit+0x1aee/0x2730 [ 30.166406] ? mm_update_next_owner+0x980/0x980 [ 30.171052] ? kasan_check_read+0x11/0x20 [ 30.175181] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.179576] ? __local_bh_enable_ip+0x161/0x230 [ 30.184226] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.189224] ? release_sock+0x1e2/0x2b0 [ 30.193176] ? trace_hardirqs_on+0xd/0x10 [ 30.197301] ? __local_bh_enable_ip+0x161/0x230 [ 30.201950] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.206342] ? kasan_check_read+0x11/0x20 [ 30.210471] ? rcu_is_watching+0x85/0x140 [ 30.214600] ? rcu_pm_notify+0xc0/0xc0 [ 30.218476] ? ___sys_sendmsg+0x31a/0x940 [ 30.222602] ? kfree+0x1e9/0x260 [ 30.225948] ? ___sys_sendmsg+0x31f/0x940 [ 30.230075] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.235595] ? copy_msghdr_from_user+0x560/0x560 [ 30.240333] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.245067] ? graph_lock+0x170/0x170 [ 30.248849] ? graph_lock+0x170/0x170 [ 30.252636] ? find_held_lock+0x36/0x1c0 [ 30.256680] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.262207] ? __fget_light+0x2ef/0x430 [ 30.266476] ? find_held_lock+0x36/0x1c0 [ 30.270536] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.276055] ? sockfd_lookup_light+0xc5/0x160 [ 30.280534] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.286049] ? __sys_sendmsg+0x1aa/0x270 [ 30.290470] ? __ia32_sys_shutdown+0x80/0x80 [ 30.294872] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.300406] ? __do_page_fault+0x441/0xe40 [ 30.304628] do_group_exit+0x16f/0x430 [ 30.308499] ? __ia32_sys_exit+0x50/0x50 [ 30.312542] ? do_syscall_64+0x92/0x800 [ 30.316501] __x64_sys_exit_group+0x3e/0x50 [ 30.320803] do_syscall_64+0x1b1/0x800 [ 30.324671] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.329491] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.334402] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.339319] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.344667] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.349491] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.354665] RIP: 0033:0x43e968 [ 30.357832] RSP: 002b:00007ffc95536b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.365520] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e968 [ 30.372773] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.380026] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.387279] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 30.394530] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.402341] Dumping ftrace buffer: [ 30.405960] (ftrace buffer empty) [ 30.409649] Kernel Offset: disabled [ 30.413257] Rebooting in 86400 seconds..