[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.706899] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.111453] random: sshd: uninitialized urandom read (32 bytes read) [ 23.602289] random: sshd: uninitialized urandom read (32 bytes read) [ 24.365443] random: sshd: uninitialized urandom read (32 bytes read) [ 24.520556] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 30.359326] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.449598] WARNING: CPU: 0 PID: 4487 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.457980] Kernel panic - not syncing: panic_on_warn set ... [ 30.457980] [ 30.465330] CPU: 0 PID: 4487 Comm: syz-executor582 Not tainted 4.17.0-rc4+ #47 [ 30.472666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.481994] Call Trace: [ 30.484570] dump_stack+0x1b9/0x294 [ 30.488177] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.493350] ? smc_unhash_sk+0x310/0x4a0 [ 30.497390] panic+0x22f/0x4de [ 30.500563] ? add_taint.cold.5+0x16/0x16 [ 30.504690] ? __warn.cold.8+0x148/0x1b3 [ 30.508731] ? __warn.cold.8+0x117/0x1b3 [ 30.512775] ? smc_unhash_sk+0x345/0x4a0 [ 30.516815] __warn.cold.8+0x163/0x1b3 [ 30.520681] ? smc_unhash_sk+0x345/0x4a0 [ 30.524726] report_bug+0x252/0x2d0 [ 30.528331] do_error_trap+0x1de/0x490 [ 30.532194] ? graph_lock+0x170/0x170 [ 30.535973] ? math_error+0x420/0x420 [ 30.539758] ? lock_acquire+0x1dc/0x520 [ 30.543717] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.548540] do_invalid_op+0x1b/0x20 [ 30.552232] invalid_op+0x14/0x20 [ 30.555666] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.560309] RSP: 0018:ffff8801c7a37488 EFLAGS: 00010293 [ 30.565651] RAX: ffff8801ad4b6600 RBX: ffff8801adee07c0 RCX: ffffffff8740e77e [ 30.572898] RDX: 0000000000000000 RSI: ffffffff8740e835 RDI: 0000000000000005 [ 30.580146] RBP: ffff8801c7a37570 R08: ffff8801ad4b6600 R09: ffffed0035bdc108 [ 30.587395] R10: ffffed0035bdc108 R11: ffff8801adee0843 R12: 1ffff10038f46e95 [ 30.594644] R13: ffff8801c7a37548 R14: ffffffff8970d520 R15: ffff8801adee0840 [ 30.601899] ? smc_unhash_sk+0x28e/0x4a0 [ 30.605939] ? smc_unhash_sk+0x345/0x4a0 [ 30.609979] ? smc_unhash_sk+0x345/0x4a0 [ 30.614028] ? smc_rx_data_available+0x100/0x100 [ 30.618775] ? release_sock+0x1e2/0x2b0 [ 30.622731] ? __local_bh_enable_ip+0x161/0x230 [ 30.627379] ? __release_sock+0x3a0/0x3a0 [ 30.631506] ? smc_release+0x269/0x610 [ 30.635371] ? trace_hardirqs_on+0xd/0x10 [ 30.639498] ? __local_bh_enable_ip+0x161/0x230 [ 30.644147] smc_release+0x36e/0x610 [ 30.647843] sock_release+0x96/0x1b0 [ 30.651535] ? sock_alloc_file+0x4e0/0x4e0 [ 30.655747] sock_close+0x16/0x20 [ 30.659180] __fput+0x34d/0x890 [ 30.662442] ? fput+0x1a0/0x1a0 [ 30.665706] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.670181] ____fput+0x15/0x20 [ 30.673441] task_work_run+0x1e4/0x290 [ 30.677308] ? task_work_cancel+0x240/0x240 [ 30.681611] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.687126] ? switch_task_namespaces+0xa2/0xd0 [ 30.691777] do_exit+0x1aee/0x2730 [ 30.695301] ? mm_update_next_owner+0x980/0x980 [ 30.699953] ? find_held_lock+0x36/0x1c0 [ 30.703997] ? lock_downgrade+0x8e0/0x8e0 [ 30.708130] ? lock_downgrade+0x8e0/0x8e0 [ 30.712259] ? kasan_check_read+0x11/0x20 [ 30.716385] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.720774] ? __local_bh_enable_ip+0x161/0x230 [ 30.725423] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.730419] ? release_sock+0x1e2/0x2b0 [ 30.734372] ? trace_hardirqs_on+0xd/0x10 [ 30.738502] ? __local_bh_enable_ip+0x161/0x230 [ 30.743151] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.747538] ? release_sock+0x1e2/0x2b0 [ 30.751499] ? __release_sock+0x3a0/0x3a0 [ 30.755635] ? __local_bh_enable_ip+0x161/0x230 [ 30.760283] ? lock_sock_nested+0xe7/0x120 [ 30.764499] ? smc_sendmsg+0x2d5/0x370 [ 30.768362] ? smc_sendpage+0x1a0/0x1a0 [ 30.772315] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.777828] ? sock_sendmsg+0x5a/0x120 [ 30.781702] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.787214] ? __sys_sendto+0x475/0x670 [ 30.791166] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.795816] ? lock_downgrade+0x8e0/0x8e0 [ 30.799944] ? handle_mm_fault+0x8c0/0xc70 [ 30.804159] ? handle_mm_fault+0x55a/0xc70 [ 30.808377] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.813895] do_group_exit+0x16f/0x430 [ 30.817762] ? __ia32_sys_exit+0x50/0x50 [ 30.821804] ? do_syscall_64+0x92/0x800 [ 30.825760] __x64_sys_exit_group+0x3e/0x50 [ 30.830065] do_syscall_64+0x1b1/0x800 [ 30.833934] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.838757] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.843664] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.848579] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.853923] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.858750] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.863917] RIP: 0033:0x43e968 [ 30.867083] RSP: 002b:00007ffd7b8ba288 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.874770] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e968 [ 30.882027] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.889283] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.896563] R10: 0000000020008004 R11: 0000000000000246 R12: 0000000000000001 [ 30.903809] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.911653] Dumping ftrace buffer: [ 30.915261] (ftrace buffer empty) [ 30.918946] Kernel Offset: disabled [ 30.922552] Rebooting in 86400 seconds..