[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.301508] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.574255] random: sshd: uninitialized urandom read (32 bytes read) [ 23.848928] random: sshd: uninitialized urandom read (32 bytes read) [ 24.566915] random: sshd: uninitialized urandom read (32 bytes read) [ 24.731296] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 30.230917] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.330910] WARNING: CPU: 0 PID: 4513 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.339382] Kernel panic - not syncing: panic_on_warn set ... [ 30.339382] [ 30.346742] CPU: 0 PID: 4513 Comm: syz-executor446 Not tainted 4.17.0-rc3+ #34 [ 30.354090] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.363427] Call Trace: [ 30.366012] dump_stack+0x1b9/0x294 [ 30.369648] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.374833] ? smc_unhash_sk+0x310/0x4a0 [ 30.378886] panic+0x22f/0x4de [ 30.382076] ? add_taint.cold.5+0x16/0x16 [ 30.386220] ? __warn.cold.8+0x148/0x1b3 [ 30.390810] ? __warn.cold.8+0x117/0x1b3 [ 30.394865] ? smc_unhash_sk+0x345/0x4a0 [ 30.398915] __warn.cold.8+0x163/0x1b3 [ 30.402798] ? smc_unhash_sk+0x345/0x4a0 [ 30.406932] report_bug+0x252/0x2d0 [ 30.410546] do_error_trap+0x1de/0x490 [ 30.414419] ? graph_lock+0x170/0x170 [ 30.418218] ? math_error+0x420/0x420 [ 30.422019] ? lock_acquire+0x1dc/0x520 [ 30.425990] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.430825] do_invalid_op+0x1b/0x20 [ 30.434524] invalid_op+0x14/0x20 [ 30.437964] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.442610] RSP: 0018:ffff8801ac017488 EFLAGS: 00010293 [ 30.447957] RAX: ffff8801d953a680 RBX: ffff8801d957e7c0 RCX: ffffffff87402b7e [ 30.455210] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 30.462465] RBP: ffff8801ac017570 R08: ffff8801d953a680 R09: ffffed003b2afd08 [ 30.469717] R10: ffffed003b2afd08 R11: ffff8801d957e843 R12: 1ffff10035802e95 [ 30.476973] R13: ffff8801ac017548 R14: ffffffff8970e8a0 R15: ffff8801d957e840 [ 30.484249] ? smc_unhash_sk+0x28e/0x4a0 [ 30.488296] ? smc_unhash_sk+0x345/0x4a0 [ 30.492345] ? smc_unhash_sk+0x345/0x4a0 [ 30.496395] ? smc_rx_data_available+0x100/0x100 [ 30.501139] ? release_sock+0x1e2/0x2b0 [ 30.505108] ? __local_bh_enable_ip+0x161/0x230 [ 30.509766] ? __release_sock+0x3a0/0x3a0 [ 30.513901] ? smc_release+0x269/0x610 [ 30.517773] ? trace_hardirqs_on+0xd/0x10 [ 30.521920] ? __local_bh_enable_ip+0x161/0x230 [ 30.526577] smc_release+0x36e/0x610 [ 30.530281] sock_release+0x96/0x1b0 [ 30.533977] ? sock_alloc_file+0x4e0/0x4e0 [ 30.538209] sock_close+0x16/0x20 [ 30.541652] __fput+0x34d/0x890 [ 30.544919] ? fput+0x1a0/0x1a0 [ 30.548275] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.552758] ____fput+0x15/0x20 [ 30.556033] task_work_run+0x1e4/0x290 [ 30.559913] ? task_work_cancel+0x240/0x240 [ 30.564229] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.569755] ? switch_task_namespaces+0xa2/0xd0 [ 30.574411] do_exit+0x1aee/0x2730 [ 30.577948] ? do_raw_spin_unlock+0x61/0x2e0 [ 30.582434] ? mm_update_next_owner+0x980/0x980 [ 30.587097] ? kasan_check_write+0x14/0x20 [ 30.591319] ? do_raw_spin_lock+0xc1/0x200 [ 30.595542] ? trace_hardirqs_off+0xd/0x10 [ 30.599765] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.604855] ? debug_check_no_obj_freed+0x2ff/0x584 [ 30.609861] ? trace_hardirqs_off+0xd/0x10 [ 30.614084] ? quarantine_put+0xeb/0x190 [ 30.618145] ? kfree+0x111/0x260 [ 30.621498] ? ___sys_sendmsg+0x31a/0x940 [ 30.625635] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.630640] ? trace_hardirqs_on+0xd/0x10 [ 30.634778] ? ___sys_sendmsg+0x31f/0x940 [ 30.638913] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.644439] ? copy_msghdr_from_user+0x560/0x560 [ 30.649201] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.653952] ? graph_lock+0x170/0x170 [ 30.657739] ? graph_lock+0x170/0x170 [ 30.661524] ? find_held_lock+0x36/0x1c0 [ 30.665575] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.671099] ? __fget_light+0x2ef/0x430 [ 30.675064] ? fget_raw+0x20/0x20 [ 30.678516] ? find_held_lock+0x36/0x1c0 [ 30.682573] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.688099] ? sockfd_lookup_light+0xc5/0x160 [ 30.692599] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.698126] ? __sys_sendmsg+0x1aa/0x270 [ 30.702178] ? __ia32_sys_shutdown+0x80/0x80 [ 30.706579] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.712109] ? __do_page_fault+0x441/0xe40 [ 30.716346] do_group_exit+0x16f/0x430 [ 30.720235] ? __ia32_sys_exit+0x50/0x50 [ 30.724292] ? do_syscall_64+0x92/0x800 [ 30.728258] __x64_sys_exit_group+0x3e/0x50 [ 30.732578] do_syscall_64+0x1b1/0x800 [ 30.736455] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.741282] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.746205] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.751142] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.756501] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.761340] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.766518] RIP: 0033:0x43eae8 [ 30.769694] RSP: 002b:00007ffe1397b9a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.777389] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eae8 [ 30.784643] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.791900] RBP: 00000000004be480 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.799159] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 30.806423] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.814313] Dumping ftrace buffer: [ 30.818014] (ftrace buffer empty) [ 30.821711] Kernel Offset: disabled [ 30.825328] Rebooting in 86400 seconds..